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MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY

(An Autonomous Institution UGC - Govt.of India)

Time: 3 hours DYNAMICS OF MACHINERY Max Marks: 75

Answer ALL questions in PART-A and Answer FIVE Questions in PART-B

***********

PART-A (25 MARKS)

(1).a)What is meant by gyroscopic couple? [2] b).Define static equilibrium. [2] c)Define the terms: coefficient of friction and limiting angle of friction? [3] d) What is brake? What is the difference between brake and clutch? [3] e) What is meant by turning movement diagram? [2] f)Define effort and power of governor? [2] g) What is meant by balancing? What are the reasons for unbalanced forces? [3] h)Define static balancing? [2] i)What are different types of vibrations? [3] j) Mention the formula for static deflection for simply supported beam with an (a) eccentric point load (b) UDL. [3] PART-B (50 MARKS)

(2) a).What will be the effect of the gyroscopic couple on a disc fixed at certain angle to a rotating shaft? b) The moment of inertia of an aero plane air screw is 20 kg-m2 and the speed of rotation is 1000 rpm clockwise when viewed from the front. The speed of the flight is 200 km per hour. Find the gyroscopic reaction of the air screw on the aero plane when it makes a left handed turn on a path of 150 m radius. [6+4]

OR 3. Derive the Expression for equilibrium of Members with two forces and a torque? [10] 4. Derive from first principles, the expression for the frictional moment (or torque due to friction) of a conical pivot assuming uniform pressure. [10] OR

5. A single plate clutch is required to transmit 150 kW at 6000 rpm. The clutch facings available provide a coefficient of friction of 0.25, and the average pressure is to be limited to 75 KN/m2. Determine the dimensions of the working surface of the clutch plate if its maximum dimension is not to exceed 160 mm due to space restrictions. [10] 6. Find a relation for the coefficient of fluctuation of speed in terms of the maximum fluctuation of energy and the kinetic energy of the flywheel at mean speed. [10]

OR

7. A Porter governor has each of its arms of 175mm length pivoted on the axis of the governor. The radius of rotation of the balls at the minimum and the maximum speeds are 105 mm and 140 mm respectively. The mass of the sleeve is 20 kg and that of each ball is 5 kg. Determine the range of speed when the friction at the sleeve is 15 N. [10] 8. A rotating shaft carries four radial masses A = 8 kg, B = C = 6 kg, and D = 5 kg. The mass centers are 30 mm, 40 mm, 40 mm, and 50 mm respectively from the axis of the shaft. The axial distance between the planes of rotation of A and B is 400mm, and that between B and C is 500 mm. The masses A and C are at right angles to each other. Find for a complete balance, (a) the angle between the masses B and D from mass A, (b) the axial distance between the planes of rotation of C and D, and (c) the magnitude of mass B. [10] OR

9. Each crank of a four cylinder vertical engine is 225mm.The reciprocating masses of the first, second and the third cranks are 100kg,120kg and 100kgand the plane ofrotationare600mm,300mm and 300mmfrom plane of rotation of the third crank .Determine the mass of the reciprocating parts of the third cylinder and the relative angular positions of the cranks if the engine is in complete primary balance. [10] 10.The string shown in Figure 1 is under tension T. Determine the natural frequency of vibration in a plane perpendicular to the string assuming that for small displacements, T remains constant. Also, prove that the period vibration is maximum when a = l/2.[10]

OR

11. Derive the expression for finding the natural frequency of longitudinal vibrations of a

shaft. By using Dunkerley’s Method. [10]

`


(An Autonomous Institution UGC-Govt.of India)



PART-A (25 MARKS)

(1).a) Give the application of gyroscopic couple principle. [3]

b) Explain the principle of virtual work. [2]

c) What is a clutch? [2]

d) Which type of brake commonly used in motor car? [3]

e) Draw the turning movement diagram for four stroke IC engine. [3]

f) How does porter governor differ from watt’s governor? [2]

g) Why is balancing necessary? [3]

h)What will happen when reciprocating masses are not balanced? [2]

i) What is the difference between discrete and continuous system? [3]

j) Briefly explain the Dunkley’s method used in natural frequency of transverse vibrations?

[2]

PART-B (50 MARKS)ө

(2).Explain the gyroscopic effect on two wheeled vehicles. [10]

OR

(3).Derive the expression of Equilibrium of members with three forces and four forces?

[10]

(4). Show that the torque transmitted by a cone clutch when the intensity of pressure is uniform

is given by: [2μW/3sinα] . [(r1

3

- r2

3

)/ (r1

2

- r2

2

)]

Where W = axial load ,μ = coefficient of friction of contact surfaces ,α = semi-cone angle

r1= outer radius of contact surface ,r

2= inner radius of contact surface. [10]

OR

(5).A simple band brake is applied to a rotating drum of diameter 500mm,The angle of lap of the

band is attached to a pin of the lever and other end is to a pin 100mm from the fulcrum. If the co-

efficient of friction is 0.25 and a braking force of 90 N is applied at a distance of 600mm from

the fulcrum, find the backing torque when the drum rotates in the (i) A.C.W,(ii) C.W direction.

[10]

(6). A torque exerted on the crank-shaft of a 2-stroke engine is given by the equation:

T(N-m)=14500+2300sin2ө-1900cos2ө,where ө is the crank angle displacement from the IDC.

Assume Torque to be constant, determine (i.) Power developed when the speed is 150 rpm.

`

(ii) The Moment of inertia of the Flywheel if the total fluctuation of speed is not to exceed +1%

of the mean speed;

(iii) The angular acceleration of the flywheel when the crank has turned through 300 from the

IDC. [10]

OR

(7).What are centrifugal governors? How do they differ from inertia governors? [10]

(8). Four masses 200kg,300kg,240kg,and 260kg are attached to a shaft. These masses are

revolving at radii 270mm,210mm,300mm,360mm respectively in planes measured from A at

270mm,420mm and 720mm respectively. The angles measured anticlockwise are m1 to m2 450,

m2 to m3 is 750, m3 to m4 135

0 and the distance between the planes L and M in which the

balance masses are to be placed is 500mm.The distance between planes A and L is 120mm and

M and D is 100mm.If the balancing masses revolve at a radius of 72mm,find their magnitude and

angular positions. [10]

OR

(9).Two cylinder engine with cranks at 1800 and the cylinders on the same side of the crank shaft

center line is having identical reciprocating masses, crank lengths and connecting rod lengths for

each cylinder . If the crank of the first cylinder makes an angle of 300 with I.D.C then the what

extent, the engine is balanced for (i) primary and secondary forces and (ii) primary and

secondary couples. [10]

(10).What are the different methods of finding the Natural Frequency of free longitudinal

vibrations? Explain f’ in details any two methods. [10]

OR

(11).A shaft is simply supported at its ends and is of 40mm in diameter and 2.5m in long. The

shaft is carries three point loads of masses 30kg,70kg and 45kg at 0.5m,1m and 1.7m

respectively from the left support. The weight of the shaft per meter length is given as 73.575 N.

The young’s modulus for the shaft material is 200 GN/m2.Find the critical speed of the shaft.

[10]

MRCET (Autonomous) Dynamics of Machinery (III B.Tech I Semester)

R13

Dept. Of Mechanical Engineering

Set No.3





PART-A (25 MARKS)

(1).a). Define plane of active gyroscopic couple. [3]

b) Define principle of superposition. [2] c) What is meant by film friction? State its laws. [3] d) What are various types of brakes? Describe briefly. [2] e) Define maximum fluctuation of energy? [3] f) What is the principle of inertia governors? [2] g) Why there are projection of hands in opposite direction in watches and clocks?[3] h) What do you mean by outside cylinder locomotive? [2] i) Give two examples each for the bad and good effects of vibration? [3] j) Define node and antinode in torsional equivalent shaft? [2]

PART-B (50 MARKS)

(2).Explain the effect of gyroscopic couple on novel –ship during steering, pitching and rolling. Explain with neat sketch. [10]

OR

(3).If the crank and connecting rod are 300mm and 1 m long respectively and the crank rotates at a constant speed of 250 rpm. find, (i).The crank angle at which the maximum velocity occurs. (ii).Maximum velocity of the piston. [10] (4).A vertical shaft of 150mm in diameter rotating at 100 rpm, rest on a flat foot-step bearing. The shaft carries a vertical load of 20KN.Assuming uniform pressure and coefficient of friction is 0.05, Estimate the power lost in friction. Prove the formula used if any. [10]

MRCET (Autonomous) Dynamics of Machinery (III B.Tech I Semester)

R13

Dept. Of Mechanical Engineering

Set No.3

OR

(5).What is the principle on which a torsion dynamometer works? Explain in detail the calculations involved in finding the power transmitted. [10] (6).(a).Define the terms: ‘Maximum fluctuation of energy(ΔΕ)’ and ‘co efficient of fluctuation of speed’. (b).Find a relation for co efficient of fluctuation of speed in terms of Maximum fluctuation of energy(ΔΕ) and the kinetic energy of the flywheel at mean speed. [10]

OR

(7).Determine (i)Maximum speed (ii)Minimum speed(iii)Range of speed of a watt governor of open arm type , in which the length of arm AE=200mm and length of EF=30mm when angles Ɵ changes from 400 to 300. [10] (8).A number of masses attached to a shaft which is rotating at an angular speed of w rad/sec. If all the masses are same plane , then describe the analytical and graphical method of balancing of these four masses by a single mass only. [10]

OR

(9).Explain in details the procedure of balancing of multi-cylinder radial engine by direct and reverse cranks method. [10] (10).Derive the natural frequency of torsional vibration of a two and three rotor system?

[10] OR

(11).A simply supported shaft of length 800mm carries a mass of 60kg placed 250mm from one end .If E=200GN/m2 and diameter of shaft is 50mm, then find the natural frequency of Transverse vibrations. [10]





PART-A (25 MARKS)

(1).a)What are the three types of movements of ship? [2]

b)What is the condition for a body to be in equilibrium under the action of two forces and a torque? [3] c)What are the uniform pressure &uniform wear theories? Write the formulae? [2] d).Explain briefly about hydraulic dynamometer? [3] e).Define co-efficient of fluctuation of speed? [2] f).Give any two distinctions between the function of governor and that of a flywheel?[3] g).Define reference plane? [2] h).Define swaying couple? [3] i).Define stiffness of spring? [2] j).What are the factors that affect the critical speed of shaft? [3]

PART-B (50 MARKS)

(2).(a).What do you mean by gyroscopic couple? Derive a relation for its magnitude.

(b).A uniform disc having a mass of 8kg and radius of gyration of 150mm is mounted on one end of horizontal arm of 200mm length. The other end of the arm can rotate freely in a universal bearing. The disc is given in a clock wise spin of 250 rpm.as seen from the disc end of the arm. Determine the motion of disc of the arm remain horizontal.[6+4]

OR (3).Figure shows a quaternary link ABCD under the action of forces F1,F2 and F3 at A,B,C and D respectively. The link is static equilibrium.Determine the magnitudes of the forces F2&F3 and the direction of F3. [10]

(4) (a).Define the terms: Friction circle and friction axis. (b).A multi-plate clutch transmits 30kw of power at 180 rpm. It has four discs on the driving shaft and three discs on the driven shaft providing six pairs of contact surfaces. The external and internal diameter of contact surfaces are 200mm and 100mm respectively. Assuming the clutch to be new. Find the total spring load pressing the plates together. Co-efficient of friction is 0.3. Also determine the maximum power

transmitted when contact surfaces have worn away by 0.4mm. There are 8 springs and the stiffness of the spring is 15KN/m. [4+6]

OR (5).A simple band brake as shown in fig. is applied to a shaft carrying a flywheel of 250Kg mass and of radius of gyration of 300mm. The shaft speed is 200rpm. The drum diameter is 200mm and the co-efficient of friction is 0.25.Determine the (i)Braking torque when a force of 120N is applied at the lever .(ii).No. of turns of the flywheel before it comes to rest.(iii).Time taken by the flywheel to come to rest. [10]

(6).A turning Moment diagram for multi cylinder engine has been drawn to a scale of vertically 1mm=600 N-m and horizontally 1mm=40.The areas above and below the mean torque line are -28,+380,-260,+310,-300,+242,-380,+265 and -299 mm2,when the engine is running at 420rpm.If that is kept within 1.2% of mean speed, find the mass of flywheel. Take radius of gyration of flywheel as 1m.

[10] OR (7).(a).With the neat sketch explain the working of Hartnell Governor(b)Calculate the change in vertical height of a Watt governor when its speed increases from 150rpm to 151 rpm. [6+4] (8).A rotor has following properties.

Planes Mass(kg) Radius(mm) Angles(ѳ) Axial distance from A(mm)

A 9 100 00 - B 7 120 600 160 C 8 140 135

0 320

D 6 120 2700

560

If the shaft is balanced by two counter masses located at 100mmradii, revolving in planes mid-way between planes A and B & mid-way between planes CandD. Determine the magnitude of masses and their respective angular positions. [10]

(OR) (9).The following data refer to a four cylinder symmetrical engine , which is complete primary balance:

Mass of reciprocating parts attached to intermediate crank =500Kg Distance between intermediate cranks =900 Distance between center lines of intermediate cranks =500mm Distance between center lines of extreme cranks =2m Length of each crank =250mm Connecting rod length between centers =1m Estimate (i) Reciprocating weights attached to extreme cranks and their relative angular positions.(ii).Unbalanced secondary force and unbalanced secondary couples. [10] (10).what do you mean by whirling speed of shaft? What is whirling (or) Critical speed? Explain. [10]

(OR) (11).find the natural frequency of the given spring-mass system as shown in below figure. [10]

MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY (An Autonomous Institution UGC - Govt.of India)

Time: 3 hours DYNAMICS OF MACHINERY Max Marks: 75 Answer ALL questions in PART-A and Answer FIVE Questions in PART-B

PART-A (25 MARKS) (1)(a).with neat vector diagram. Explain the application of gyroscopic couple on aero plane. [3] (b).Define correction couple. Why it is required? [2] (c).For a flat collar bearing, the total fluctuation of torque, while assume uniform pressure theory? [3] (d).What is meant by self-locking & self-energized brake? [2] (e).Small flywheel is used in multi-cylinder engine. Why? [3] (f).Define height of governor? [2] (g).Briefly explain the analytical method used to balance several masses in same plane? [3] (h).Mention the effects of unbalanced primary force along the line of stroke? [2] (i).Define damping factor? [3] (j).Write condition for under damped, critical damped, over damped system.[2]

PART-B (50 MARKS)

(2).(a)Explain the effect of novel ship during steering? (b) The rotor of the turbine of a yacht makes 1200rpm clockwise when viewed fromthe stern. The rotor has a mass of 750 kg, and its radius of gyration is 250 mm. Find the maximum gyroscopic couple transmitted to the hull (body of the yacht), when the yacht pitches with maximum angular velocity of 1 rad/s. [3+7]

OR (3).The stroke of a Steam engine is 600mm & length of connecting rod is 1.5m.The crank rotates at 180rpm. Determine (i) Velocity and acceleration of the piston when crank has travelled through an angle of 400 from inner dead center ,and (ii) The position of the crank for zero acceleration of the piston. [10] (4).A single plate clutch (both sides effective) is required to transmit 26.5 KW at 1600 rpm. The outer diameter of the plate is limited to 300 mm, and the intensity of pressure between the plates is not to exceed 68.5 KN/m2. Assuming uniform pressure and uniform wear, the co-efficient of friction of 0.3 , show that the inner diameter of the plate is approximately 90 mm. [10]

OR (5).What is the function of dynamometer? Explain the working principle of epi-cyclic train dynamometer. [10]

(6).A three cylinder single acting engine has its cranks set equally at 1200 and it runs at 750 rpm. The torque-crank angle diagram for each cycle is a triangle for the power stroke with a maximum torque of 100 N-m at 600 from dead Centre of corresponding crank. The torque on the return stroke is sensibly zero. Determine (i).power developed (ii).coefficient of fluctuation of speed, if the mass of the flywheel is 15Kg and has a radius of gyration of 90mm. (iii).Coefficient of fluctuation of energy (iv).Maximum angular acceleration of the flywheel. [10]

OR (7).In a Hartnell governor, the lengths of the ball and the sleeve arms are equal. The extreme radii of rotation of the balls are 60 mm and 80 mm, and the corresponding speeds are 160 rpm and 175 rpm. Each ball has a mass of 2 kg. Find the spring stiffness and the initial compression of the central spring. [10]

(8). A rotating shaft carries four unbalanced masses 20 kg, 15 kg, 18 kg, and 12 kg at radii 50 mm, 60 mm, 70 mm, and 60 mm, respectively. The second, third and fourth masses revolve in planes 100 mm, 150 mm and 300 mm respectively measured from the plane of the first mass, and at angular locations of 600,1200 and 2800 respectively measured clockwise from the first mass. The shaft is dynamically balanced by two masses, both located at 50 mm radii, and revolving in planes midway between those of the first and second masses and midway between those of the third and fourth masses. Determine graphically the magnitudes of the two balancing masses and their angular positions. OR [10] (9).Explain the method of direct and reverse cranks to determine the unbalanced forces in radial engines. [10] (10). (a). Derive the expression for natural frequency of free torsional vibration of a single rotor system? (b).Explain the following terms: (i) Natural vibrations (ii) Damped vibrations (iii) Forced vibrations

OR [5+5] (11).A torsional vibration of a three rotor system as shown in figure. Find natural frequency’s and the position of nodes. Also find amplitudes of vibrations. Take G=84x 109 N/m2. [10]

DEPARTMENT OF MECHANICAL ENGINEERING

MALLAREDDY COLLEGE OF ENGINEERING &TECHNOLOGY

MODEL PAER –1

SUB: THERMAL ENGINEERING

PART - A

1. Answer the following questions

i.) What is time loss factor? (2M )

ii.) Why the air standard cycle efficiency is less than the actual cycle? (3M)

iii.) List out different antiknock additives used in SI engine. (2M)

iv.) What is delay period and write its importance in CI engines. (3M)

v.) Define the terms BP, FP and IP. (2M)

vi.) Describe briefly about the heat balance sheet of IC engine. (3M )

vii.) Differentiate between fans, blowers and compressors. (2M)

viii.) What is the effect of clearance on efficiency of compressor? (3M )

ix.) Define isentropic efficiency and pressure coefficient. (2M)

x.) What are the different losses in case of a centrifugal compressor? (3M )

PART – B

Answer the following question each question carries 10 Marks

1. Differentiate between air standard cycles and actual cycles.

OR

2. With the help of a simple schematic diagram, explain the working of a magneto ignition system.

3. With the help of a p-Ө (pressure-time or crank angle) diagram, explain the different stages of combustion in

S.I. engine.

OR

4. With the help of simple schematic, explain the working of different types of direct combustion chambers of

CI engines.

5. During the testing of a 4s oil engine fitted with a simple rope brake dynamo meter, the following readings were taken.

Brake wheel diameter = 60 cm Brake rope diameter = 2.5 cm Dead load on the brake = 200 N Spring balance reading = 50 N Speed = 450 RPM

Area of indicator diagram = 4.2 cm2

Length of the indicator diagram = 6 cm Spring constant = 6 bar/ cm Bore = 10 cm Stroke = 15 cm Brake SFC = 0.3 kg/kWh Calorific value = 43960 kJ/kg

Determine the brake power, mechanical efficiency and indicated thermal efficiency

OR

6. Explain briefly how to determine IP of IC engine using Morse test.

7. .A single acting reciprocating compressor having 8 cm bore and 10 cm stroke compresses air from 1 bar to

a delivery pressure of 6 bar. The compressed gas is stored in a receiver having a capacity of 1.2 m3

. The speed of the compressor is 500 RPM and consumes 1.175 kW brake power. The indicated mean effective

pressure is 2.24 bar. The initial conditions in the reservoir were 1 bar and 150

C. After 2 minutes of pumping

the pressure rise in the receiver is 6 bar at 520

C. Find

i) Free air delivered per minute at 150

C ii) Volumetric efficiency iii) Mechanical and isothermal efficiencies. OR

8. With a neat diagram explain the working of vane type compressor. Write the differences between

reciprocating and rotary air compressors.

9. With a suitable sketch and velocity diagrams explain the working principle of centrifugal compressor.

OR

10. An eight stage axial flow compressor of 50% reaction has a mean blade velocity of 185m/s and a constant

axial velocity of 100m/s throughout the compressor. The work is divided equally between the stages and

the machine provides an overall pressure ratio of 6:1 with an isentropic efficiency of 90%. Assuming air

temperature of 290K estimate the power required and the angles of impeller blade.



MODEL PAER –2


PART - A


i. Write notes on exhaust blow down loss. (3M)

ii. Classify the different types of IC engines. (2M )

iii. What are the characteristics of SI engine fuels? (3M)

iv. What are factors which influence the delay period in CI engines? (2M)

v. List out the different parameters of performance of IC engine. (3M)

vi. What is the use of heat balance sheet of an IC engine? (2M)

vii. Write the advantages of multistage compression over single stage compression. (3M)

viii. What are the required components for vane type compressors? (2M)

ix. Draw the velocity triangles of axial flow compressors. (3M)

x. Write notes on slip factor and power input factor. (2M)

PART – B


1. With the help of a simple schematic diagram, explain the working of a battery coil ignition system.

(OR)

2. Why the actual cycle efficiency of an IC engine is less than the air standard cycle explain in detail.

3. What is meant by ignition lag in SI engines and explain the factors affecting the ignition lag.

OR

4. What are the requirements of CI engine combustion chamber? Explain why weak mixtures give better

efficiency in CI engines.

5. Explain the Morse test to determine the frictional power.

OR

6. A two stroke diesel engine has a bore of 110mm and stroke of 150mm running at a mean speed of 5m/s

it develops torque of 56.3N-m mechanical efficiency of the engine is 80% and the indicated efficiency is

40%. Assuming calorific value of fuel used 44800kJ/kg, determine a) IP b) indicated mean effective

pressure c) the fuel consumption per kWh of BP.

7. A single stage air compressor running at 80 rpm compresses air from a pressure of 1 bar and temp. of

15oC to a pressure of 5 bar clearance volume is 5% of swept volume, which is 0.4m3. Assuming

compression and expansion follows the law pV1.3 = const. Determine the power required to drive the

compressor.

OR

8. A single stage double acting air compressor running at 5RPS delivers air at 7 bar from 1 bar and 270

C.

The amount of free air delivered is 0.15 m3

/s. If the clearance volume is 5% of swept volume and index

of expansion/compression is 1.3. Calculate the volumetric efficiency, indicated power and cylinder

dimensions if L/D ratio as 1.2.

9. Give the analysis of centrifugal compressors with the help of velocity diagrams.

OR

10. Describe with a neat sketch the working of an axial flow compressor. Explain the term degree of reaction

for an axial flow compressor.



MODEL PAER –3

SUB : THERMAL ENGINEERING

PART - A


i. Write notes on rubbing friction losses.(2M )

ii. What are different methods are adopted in cooling of an I.C. Engine? (3M)

iii. What is meant by ignition lag in SI engines? (2M)

iv. Define swirl and squish? (3M)

v. Define specific fuel consumption and state its importance. (2M)

vi. A diesel engine has a brake thermal efficiency of 28% if the calorific value of fuel is 42000kJ/kg.

Find its brake specific fuel consumption. (3M )

vii. What are different applications of vane compressor? (2M)

viii. Differentiate between positive displacement and non positive displacement compressors. (3M )

ix. What are the different losses in case of a centrifugal compressor? (3M )

x. What is choking of a compressor? (2M)

PART – B


1. Explain the different losses of actual cycles.

OR

2. What is the function of a Carburetor? With the help of a simple schematic diagram, explain the working of

a modern carburetor.

3. With all minute details, explain the factors affecting the knocking including the fuel characteristics for S I Engines.

(OR) 4. With the help of diagrams, explain different combustion chambers used in CI engines and advantages of

each. 5. A 4 cylinder 4 – stroke petrol engine having bore 6 cm and stroke 10 cm develops 65 N-m torque at 3000

RPM. Find the fuel consumption of the engine in kg/hr and brake mean effective pressure, if the relative

efficiency of 50% and clearance volume is 60 cm3

. Take CV = 40 MJ/kg. (OR) 6. What is the use of heat balance sheet of an engine? Mention the various items to be considered to

complete the heat balance sheet.

7. In single stage single acting air compressor of 30 cm dia, 40 cm stroke makes 100RPM. It takes air at 1 bar

and 200

C to a pressure of 5 bar. Calculate mean effective pressure and power required to drive it when compression is isothermal and adiabatic.

OR

8. Derive the expression for the pressure ratio in each stage of multi stage axial flow air compressor. 9. A centrifugal compressor used as super charger aero engines handles 150kg/min of air. Thesuction

pressure and temperature are 1bar and 290K. the suction velocity is 80m/s after compression in the

impeller the conditions are 1.5bar 345k and 220m/s. Calculate a) isentropic efficiency b) power required to drive the compressor c) the overall efficiency of the unit. OR

10. a) Draw the velocity triangles and give the analysis of axial flow compressors. b) Explain the significance of Degree of Reaction in axial flow compressors.



MODEL PAER –4


PART - A


i. What is the significance of fuel – air cycle? (2M )

ii. Differentiate between actual cycles and air standard cycles. (3M)

iii. What are the requirements of fuel injection system of IC engine? (3M)

iv. What is meant by abnormal combustion in SI engine? (2M)

v. Explain the significance in the design of CI engine combustion chambers (3M)

vi. What is ropy brake dynamometer? (3M)

vii. List out the different parameters of performance of IC engine. (2M)

viii. What are the required components for Vane type compressor? (3M)

ix. Define Isothermal efficiency and FAD. (3M)

x. Explain degree of reaction.

PART – B


1. List out the assumptions made in air standard cycles. Explain the reasons for variation of specific heat.

(OR)

2. Explain the variables which affect the volumetric efficiency of an IC engine.

3. a) Explain the methods to control the knocking in SI engine.

b) Explain the significance of Octane number in the rating of SI engine fuel.

OR

4. Differentiate between direct injection type and indirect injection type combustion chambers used in CI

engines. What is ignition delay in combustion of CI engine?

5. The output of a single cylinder four stroke IC engine is measured by a rope brake dynamometer. The

diameter of the brake pulley is 750 mm and rope diameter 50 mm. The dead load on the tight side of the

rope is 400 N and the spring balance reading is 50 N. The bore is 150 mm and stroke is 190 mm. The

engine consumes 4 kg/h of fuel at rated speed of 1000 rpm. The calorific value of the fuel is 44 MJ/kg.

Calculate the brake specific fuel consumption, bmep and the brake thermal efficiency. If the mechanical

efficiency is 80%, calculate the IP, imep, indicated specific fuel consumption and indicated thermal

efficiency.

(OR)

6. A four cylinder 2 stroke cycle petrol engine develops 30kW at 2500 rpm. The mean effective pressure as

each piston side is 4 bar and mechanical efficiency is 80% calculate a)the diameter and stroke of cylinder

if the strike to bore ratio is 1.5. b) the fuel consumption if the brake thermal efficiency is 28% CV of fuel is

43900kJ/kg.

7. A single stage air compressor is required to deal with 30 m3

of free air per ht at 1 bar. The delivery pressure

at 450 RPM is 6.5 bar. Calculate clearance ratio, the IMEP, BP if the mechanical efficiency is 0.8,

isothermal efficiency is 0.76 and volumetric efficiency is 0.75.

OR

8. Draw the velocity triangles for centrifugal compressor and derive the equation of work.

9. Derive the equation for the work required to compress the air to the desired pressure in axial flow

compressor.

OR

10. An axial flow compressor with an overall isentropic efficiency of 82% draws air at 150C and compresses it

in the pressure ratio of 3.5:1. The mean blade speed is 180m/s and flow velocity remains constant

assuming 50% reaction balding with α1 = 150 and β1 = 450. Determine a) flow velocity b) no. of stages.



MODEL PAER –5

SUB: TERMAL ENGINEERING - I

PART - A


i. Explain about loss due to gas exchange process. (3M )

ii. What is the function of idling jet in a carburetor? (3M)

iii. What is meant by ignition lag? (2M )

iv. What are the advantages and disadvantages of direct injection combustion chambers? (3M)

v. What is Morse test? (2M )

vi. Define the terms a) SFC b) Brake thermal efficiency c) Relative efficiency. (3M)

vii. What are the differences between rotary air compressor and reciprocating air compressor? (2M )

viii. What are the advantages of multi stage compressor over single stage compressor? (3M)

ix. Define slip factor and power input factor (2M)

x. Discuss the significance of velocity triangles (3M)

PART – B


1. Find the percentage change in thermal efficiency of Otto cycle having a compression ratio of 12 and

specific heat at constant pressure is increased by 1%.

(OR)

2. a) Explain with the help of line diagram the working of a simple carburetor.

b) Explain briefly about thermosyphon water cooling system.

3. a) Explain the methods to control the knocking in SI engines.

b) Explain the significance of Octane number in the rating of SI engine fuels.

(OR)

4. How to create turbulence in CI engine combustion chambers in order to get better mixing air fuel? Explain.

5. Describe the measurement of air using air box method.

OR

6. A four stroke six cylinder engine has a bore of 80mm and stroke of 100mm while running at the mean

speed of 12.5m/s its fuel consumption is 20kg/hr. and develops torque of 150N-m assuming a clearance

volume of 75cm3 per cylinder determine the a) BP and bmep b) brake thermal efficiency if the CV of fuel is

42.5MJ/kg c) Relative efficiency.

7. A single cylinder reciprocating compressor has a piston displacement of 0.1m3 the suction pressure and

temp. are 1 bar and 298K. If the delivery pressure after compression is 7bar. Calculate a) the work required

to compress the air isentropically γ=1.4 and polytropically according to the law of pV1.25 = const. b) the

isothermal efficiency for the isentropic and polytropic compression processes .

OR

8. Explain the working principle of roots blower and vane type compressor with neat diagrams.

9. Explain the following terms

a) Slip factor b) pressure coefficient c) adiabatic coefficient d) power input factor e) degree of reaction

OR

10. Differentiate between centrifugal compressor and axial flow compressors. Explain the terms surging,

choking and stalling.



MODEL PAPER –I

SUB : FLUID MECHANICS & HYDRAULIC MACHINERY

PART – A

Answer the following questions

i.) Define specific gravity & specific weight. (2M )

ii.) State and prove Pascal s Law . (3M)

iii.) Classify different types of fluids with examples. (3M)

iv.) Define Continuity equation of 1D. (2M)

v.) Define specific speed of a turbine. (3M)

vi.) Define HGL & TGL. (2M )

vii.) What is Jet? (2M)

viii.) Explain difference between Impulse & Reaction turbines. (3M)

ix.) Define NPSH. (2M)

x.) What is the importance of Indicator Diagram ? (3M)

PART – B


2. a) Differentiate between simple and differential type of manometers.

b) A rectangular plate of size 25cm x 50cm and weighing 25kg (f) slides down 300

inclined surfaces at a

uniform velocity of 2m/sec. If the uniform 2mm gap between the plate and inclined surface is filled with oil.

Determine the viscosity of oil?

(OR)

3. What is the pressure within a droplet of water 0.5mm in diameter at 200C, if the pressure outside the droplet is

standard atmospheric pressure of 1.03Kg (f)/cm2. Given σ = 0.0075 Kg(f)/m for water at 2000C.

4. a) State and derive Bernoulli’s theorem, mentioning clearly assumptions underlying it.

b) A bend in pipe line conveying water gradually reduces from 0.6 to 0.3mts diameter and deflects the through

angle of 600. At the large end the gauge pressure is 171.675KN/m

2.Determine the magnitude and direction of

force exerted on bend when there is no flow. (OR)

5. Derive the equation of continuity for 3-D Fluid flows

6. a) Explain the measurement of flow using a pitot tube

b) A venturimeter has its axis vertical, the inlet and throat diameters being 150mm and 75mm respectively.

The throat is 225 mm above inlet and cd=0.96 petrol of specific gravity 0.78. Flows up through the water

meter at a rate 0f 0.029m3 /sec. Find the pressure difference between inlet and throat .

(OR)

7. a) A jet of water having a velocity of 30m/s strikes a curved vane, which is moving with a velocity of 15m/s.

The jet makes an angle of 30 0 with the direction of motion of vane at inlet and leaves at angle of 120 0 to the

direction of motion of vane at outlet. Calculate: (i) vane angles, if water enters and leaves the vanes without

shock, (ii) work done per second per unit weight of water striking per second.

b) Derive Darcy-Weisbach equation?

8. a) Derive an expression for the force exerted by fluid on moving flat plate.

b) A Pelton wheel is to be designed for the following specifications. Power= 735.75 kW S.P head= 200m,

Speed=800rpm, overall efficiency=0.86 and jet diameter is not to exceed one-tenth the wheel diameter.

Determine: (i) Wheel diameter, (ii) the no of jets required and (iii) diameter of the jet. Take Cv=0.98 and

speed ratio=0.45

(OR)

9. a) What is cavitation ? How can it be avoided in reaction turbine?

b) What is the basis of selection of a turbine at a particular place?

10. Define a centrifugal pump. Explain the working of a single stage centrifugal pump with neat sketches.

(OR)

11. A 4 stage centrifugal pump has 4 identical impellers, keyed to the same shaft. The shaft is running at 400rpm

and the total manometric head developed by the multistage pump is 40m. The discharge through the pump is

0.2m3/s. The vanes of each impeller are having outlet angle as 45

0. If the width and diameter of each impeller at

outlet is 5cm and 60cm respectively, find the manometric efficiency.



MODEL PAPER –II


PART - A


i) Define capillarity & surface Tension. (2M )

ii) State atmospheric, vacuum & gauge pressures. (3M)

iii) Differentiate stream line, streak line & path line. (3M)

iv) Define compressible & in compressible fluids. (2M)

v) What are the efficiencies available in a turbine? (3M)

vi) Define minor losses in pipes. (2M )

vii) What is impact of Jet? (2M)

viii) Explain governing of Turbines. (3M)

ix) Define Unit speed & Unit discharge. (2M)

x) What is the priming of a pump? (3M)

PART – B


2 a) Differentiate between i.) Absolute and gauge pressure, ii.) simple manometers and differential manometers,

and iii.) Piezometer and pressure gauge.

b) Two large vertical plane parallel surfaces are 5 mm apart and the space between them is filled with a fluid. A thin plate

of 12.5 cm square falls freely between the planes along the central plane and reaches a steady velocity of 2 m/s.

Determine the weight of the plate if the viscosity of the fluid filling the space is 0.02 Ns/m .

(OR)

3. a) Two large planes are parallel to each other and are inclined at 30° to the horizontal with the space between them filled

with a fluid of viscosity 20 cp. A small thin plate of 0.125 m square slides parallel and midway between the planes and

reaches a constant velocity of 2 m/s. The weight of the plate is 1 N. Determine the distance between the plates.

b) Derive expressions from basics for the pressure inside a droplet and a free jet.

4. a) What is meant by one-dimensional, two-dimensional and three- dimensional flows?

b) Distinguish between: i) Steady flow and un-steady flow ii) Uniform and non-uniform flow iii) Compressible and

incompressible flow iv) Laminar and turbulent flow

(OR)

5. a) A bend in pipeline conveying water gradually reduces from 60 cm to 30 cm diameter and defects the flow through

angel of 60°. At the larger end the gage pressure is 1.75 kg/cm2 . Determine the magnitude and direction of the force

exerted on the bend, when flow is 876 liters per sec

b) What are different energies of a fluid? Explain each of them.

6. a) A Pelton wheel has a mean bucket speed of 35m/s with a jet of water flowing at the rate of 1m3/s under a head of 270m.

The buckets deflect the jet through an angle of 1700. Calculate the power delivered to the runner and the hydraulic

efficiency of the turbine. Assume co-efficient of velocity as 0.98.

b) Describe Reynolds experiments to demonstrate the two types of flow

(OR)

7. A horizontal venturimeter with inlet diameter 20 cm and throat diameter 10 cm is used to measure the flow of

water. The pressure at inlet is 17.658 N/cm2 and the vacuum pressure at the throat is 30 cm of mercury. Find the discharge

of water through venturimeter. Take Cd=0.98. b) Explain various minor losses in pipes.

8. a) Derive the expression for the force exerted by a water jet on a plate moving in the same direction of the jet with

a velocity less than that of the jet.

b) A blade turns the jet of diameter 3 cm at a velocity of 20 m/s by 60°. Determine the force exerted by the blade on

the fluid. (OR)

9. a) What do you understand by the characteristics curves of turbine? Name and explain the important characteristics curves

of a turbine.

b) What is meant by ‘cavitation’? What is Thoma’s cavitation factor and what is its significance for water turbines?

10. a) The diameter of an impeller of a centrifugal pump at inlet and outlet are 30 cm and 60 cm respectively. Determine

the minimum starting speed of the pump, if it works against a head of 30 m.

b) Explain the performance of a centrifugal pump using performance characteristic curves

(OR)

11. A single-acting reciprocating pump has a plunger of diameter 250 mm and stroke of 350 mm. if the speed of the pump

is 60 rpm and it deliver 16.5 lps of water against a suction head of 5 m and a delivery head of 20 m. Determine the

theoretical discharge, coefficient of discharge, the slip, the percentage of slip and the power required to drive the pump.



MODEL PAPER –III


PART - A


i) Explain surface tension for a liquid jet?

ii) Define major losses in pipes.

iii) Define piezometer..

iv) What is kinematic viscosity and Dynamic Viscosity?

v) Define surface tension. State its units.

vi) Explain rotational and irrotational flows?

vii) Explain Pelton wheel turbine?

viii) How Hydraulic turbines are classified?

ix) What are the unit Quantities?

x) Explain impact of jet on curved Vanes?

PART – B


2. a) Obtain an expression for the force exerted by a jet of water on a fixed vertical plate in the direction of the jet.

b) A jet of water of diameter 100 mm moving with a velocity of 35 m/s strikes a curved fixed symmetrical plate at the

center. Find the force exerted by the jet of water in the direction of the jet, if the jet is deflected through an angle of 120°

at the outlet of the curved plate.

(OR)

3. a) What are the different efficiencies of centrifugal pump

b) Draw and discuss the operating characteristics of a centrifugal pump

4. a) Explain briefly the principles on which pelton wheel works?

b) Design a pelton wheel which is required to develop 1500kW, when working under a head of 160mts at a speed of

420rpm.the overall efficiency may taken as 85% and assume other data required.

(OR)

5. a) Derive Bernoullis equation from the fundamentals of Eulers. What are the assumptions of these Equations?

b) The water is flowing through a taper pipe of length 50m having diameters 40cm at the upper end and 20cm at lower

end, at the rate of 60 litres/sec. The pipe has a slope of 1in 40. Find the pressure at the lower end if the pressure at the

higher level is 24.525 N/cm2 .

6. a) A U- tube mercury manometer is used to measure the pressure of oil flowing through a pipe whose specific gravity

is 0.85. The center of the pipe is 15 cm below the level of mercury. The mercury level difference in the manometer is 25

cm, determine the absolute pressure of the oil flowing through the pipe. Atmospheric pressure is 750 mm of Hg.

b) State and prove Pascal’s law. Explain the consequences of the law.

(OR)

7. a) Explain how hydraulic turbines are classified.

b) Explain briefly the principles on which a Kaplan turbine works

8. a) A reaction turbine works at 500rpm under a head of 100m. The diameter of turbine at inlet is 100cm and flow area is

0.365m2 . The angles made by absolute and relative velocities at inlet are 15

0 and 60

0 respectively with the tangential

velocity. Determine: (i) The volume flow rate (ii) the power developed (iii) efficiency. Assume the whirl velocity as zero

b) What is the difference between dynamic viscosity and kinematic viscosity? State their units of measurements.

(OR)

9. a) Derive an expression for the velocity distribution for viscous flow through a circular pipe. Also sketch the velocity

distribution and shear distribution across a section of the pipe

b) Define and explain the terms: i) Hydraulic gradient line and ii) Total energy line

10. a) Make a neat sketch of a hydropower plant and show clearly the various elements.

b) How do you estimate hydropower potential (OR)

11. A centrifugal pump is running at 1000 rpm. The outlet vane angle of the impeller is 300 and velocity of flow at outlet is

3m/s. The pump is working against a total head of 30m and the discharge through the pump is 0.3m3/s. If the manometric

efficiency of the pump is 75%, determine (i) the diameter of the impeller and (ii) the width of the impeller at outlet.



MODEL PAPER –IV


PART - A


i) Explain stream line and path line.

ii) Differentiate between uniform and non uniform flow.

iii) Derive expression on surface tension for a liquid jet.

iv) What are laminar and turbulent boundary layers?

v) Define Reynolds experiment.

vi) What are the different physical properties in a fluid?

vii) Explain governing of turbines.

viii) What is barometric head?

ix) What do you mean by draft tube theory?

x) Explain the working principle of reciprocating pumps.

PART – B


2. Explain the terms ‘specific speed’, ‘unit speed’ and ‘unit power’ as applied to hydraulic turbines. Deduce expressions to

indicate their values.

(OR)

3. a) Explain different types of differential manometers with the help of neat diagram.

b) A single column vertical manometer is connected to a pipe containing oil of specific gravity 0.9. The area of the

reservoir is 80 times the area of the manometer tube. The reservoir contains mercury of sp. gr. 13.6. The level of mercury

in the reservoir is at a height of 30 cm below the center of the pipe and difference of mercury levels in the reservoir in the

right limb is 50 cm. find the pressure in the pipe.

4. a) Define cavitation. What are the effects of cavitation?

b) A single acting Reciprocating pump running at 30rpm delivers 0.012 m3 /s of water. The diameter of the piston is

25cm and stroke length is 50 cm. Determine: i) The theoretical discharge of the pump, ii) Co-efficient of discharge, and

iii) slip and percentage slip of the pump.

(OR)

4. a) Distinguish between manometers and mechanical gauges. What are the different types of mechanical pressure

gauges?

b) A 40cm diameter pipe, conveying water, branches into two pipes of diameters 30cm and 20cm respectively. If the

average velocity in the 40cm diameter pipe is 3m/s. Find the discharge in this pipe. Also determine the velocity in 20cm

pipe if the average velocity in 30 cm pipe is 3 m/s .

6. a) Explain single column vertical manometer and single column inclined manometer.

b) A 30cm diameter pipe carries water under a head of 15 m with a velocity of 4m/s. if the axis of the pipe turns

through 450 find the magnitude and the direction of the resultant force at the bend.

(OR)

7. a) What are the different characteristics along a thin plate ?

b) A horizontal venturimeter with inlet and throat diameters 30 cm and 15 cm respectively is used to measure the flow

of water. The reading of the differential manometer connected to inlet and throat is 10cm of mercury. Determine the rate

of flow. Take Cd= 0.98.

8. a) What is a reciprocating pump? Describe the principle and working of a reciprocating pump with a neat sketch.

b) Design a pelton wheel for a head of 80m and speed of 300 rpm. The Pelton Wheel develops 103kW SP. Take

Cv=0.98, speed ratio=0.45 and overall efficiency=0.80.

(OR)

9. a) Explain major and minor losses in the pipes.

b) Calculate the rate of flow of water through a pipe of diameter 300 mm, when the difference of pressure heads between

the two ends of a pipe 400 m apart is 5m of water. Take the value of f= 0.009

10. A 45obend is connected in a pipe line, the diameters at the inlet and outlet of the bend being 40 cm and 20 cm

respectively. Find the force exerted by the water on the bend if the intensity of the pressure at inlet of bend is 21.58

N/cm2. The rate of flow of water is 5000 litres/sec.

(OR)

11. a) Obtain an expression for the force exerted by a jet of water on a fixed vertical plate in the direction of the jet.

b) A blade turns the jet of diameter 2 cm at a velocity of 15 m/s by 65°. Determine the force exerted by the blade on the

fluid.



MODEL PAPER –V


PART - A


i) Derive expression for surface tension on a droplet.

ii) Differentiate between laminar and turbulent flow.

iii) Define HGL and TEL.

iv) Explain flow over radial vanes.

v) Explain working principle of centrifugal pumps.

vi) Differentiate between vaccum pressure and guage pressures.

vii) Derive momentum equation in a pipe bend.

viii) What is venturimeter and orificemeter?

ix) Discuss various efficiencies in hydraulic turbines.

x) What are the performance characteristic curves?

PART – B


2. a) Write Eulers equation of motion along a stream line and itegrate it to obtain Bernoulli’s equation.

b) The water is flowing through a pipe having diameters 40 cm and 20 cm at sections 1 and 2 respectively. The rate of

flow through a pipe is 40 litres/s. the section 1 is 6m above the datum line and section 2 is 3m above the datum. Find the

intensity of pressure at section 2, if the pressure at section is 1 is 29.43 N/cm2

(OR)

3. Determine the difference in the elevations between the water surfaces in the two tanks which are connected by a

horizontal pipe of diameter 400 mm and length 500m. the rate of flow of water through the pipe is 200 litres/s. Consider

all the losses and take the value of f=0.009

4. a) Define i) kinematic viscosity ii) dynamic viscosity iii) Critical velocity.

b) A pipe of diameter 400 mm carries water at a velocity of 25 m/s. The pressure at the points A & B are given as 29.43 N/cm

and 22.563 N/cm2 respectively, while the datum head at A and B are 28 m and 30 m. Calculate the loss of head at A and B.

(OR)

5. Define the term governing of a turbine. Describe with a neat sketc working of oil pressure governor.

6. A francis turbine with an overall efficiency of 70% is required to produce 147.15 kW. It is working under a head of 8m.

The peripheral velocity=0.30�2�ℎ and the radial velocity of flow at inlet is 0.96�2�ℎ. The wheel runs at 200 rpm and

the hydraulic losses in the turbine are 20% of the available energy. Assume radial discharge, determine: (i) the guide

blade angle, (ii) the wheel vane angle at inlet (iii) the diameter of wheel at inlet and (iv) width of wheel at inlet. ( Ans: (i)

350 (ii) 420 (iii) 35.9 cm (iv) 19.75 cm )

(OR)

7. a) Derive the expression for the force exerted by a water jet on a plate moving in the same direction of the jet with a

velocity less than that of the jet. b) A blade turns the jet of diameter 2.5cm at a velocity of 25 m/s by 60°. Determine the force exerted by the blade on the

fluid.

8. a) What are the main differences between impulse and reaction turbines? b) List the various efficiencies used to express the performance of hydraulic turbines.

(OR) 9. a) What are unit quantities? Define the unit quantities for turbine. b) By means of a neat sketch explain the governing mechanism of Francis turbine.

10. What do you mean by manometric efficiency, mechanical efficiency and overall efficiency of Centrifugal Pump? (OR)

11. a) What is meant by flow duration curve and power duration curve? How do you differentiate these? How would you

construct such curves?

b) Explain how hydropower plants are classified.

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous)

Time: 3 Hour II B.Tech II Semester (MD MODEL PAPER -1) Max Marks:75MARKS

Note: (i) PART-A: Answer any TWO of the following questions.

PART-B is compulsory. ii. Assume proportionate dimensions wherever necessary

SECTION – A (15M*2=30 Marks)

1.(a)Sketch a metric’V’thread.(b)Sketch Woodruff key(c)Flat rivet thead.

(b)Sleeve and Cotter joint to connect two rods of 25mm diameter

2.Draw the Double riveted double strap zigzag butt joint to connect two10mm

plates.

3.Universal coupling to connect two shafts of 40mm each.

SECTION-B(Compulsory Question) (45Marks)

4.The part drawings of an ECCENTRIC are enclosed in the sketch. Assumable the parts and draw.(a)Half sectional front view with top half in section and(b)Left side view.


B.TECH (MECH) II Yr IISem (MODEL-2) Examination APR 2017

MACHINE DRAWING

Time: 3 Hours Max Marks: 75

Note: i. Answer all questions from Section-A and Section-B

ii. Assume proportionate dimensions wherever necessary

iii. Choose suitable scale and indicate proportions for free hand sketches

Section - A (15*2=30 Marks)

1. Sketch the conventional representation of the following

a) Building materials b) Packing and insulating materials

2. Sketch the following

a) Square thread b) Whitworth thread

3. Sketch a solid coupling for 30mm diameter of shaft

Section-B (1*45=45 Marks)

5. The details of a tail stock as shown in fig 2. Draw the following views

i) Front view in full section ii) Top view lower half in section

Fig.2 Details of tail stock


B.TECH (MECH) II Yr II-Sem (MODEL-3) Examination APR 2017

MACHINE DRAWING

PREPARED BY B.MAHENDRA M.TECH ASST. PROF.OF MRCET

Time: 3 Hours Max Marks:75




SECTION - A (15*2=30Marks)


a) Metals b) Glass

2. Sketch with free hand, sectional front view of square headed bolt of diameter 30mm and

indicate proportionate dimensions.

3. Sketch a muff coupling for 25mm diameter of shaft

SECTION-B (1*45=45MARKS)

4. The details of screw jack as shown in fig.2. Draw the following assembled views

i) Half sectional view from the front ii) view from above

Fig.2 Details of Screw Jack

MALLA REDDY COLLEGE OF ENGINEERING ANDTECHNOLOGY MECH II YER II SEM MACHINE DRAWING (model paper 4) Max. Marks-75

PART – A(Write Any Two Questions) 2*15=30

1. Draw the double riveted double strap zig – zag butt joint to join 12 mm plates. [15]

2. Sketch the following with drawing proportions

a) Buttress thread. b) Square thread. c) Worm thread. [15]

3. Represent two views of hexagonal nut and square nut with proportions take the diameter of the

bolt as 30 mm. [15]

PART – B (1*45=45marks) 4. Figure gives the part drawings of Plummer black. Assemble all the parts and draw the following

assembled views: a) Sectional front view b) Top view.


B.TECH (MECH) II Yr II-Sem (MODEL-3) Examination APR 2017

MACHINE DRAWING

PREPARED BY B.MAHENDRA M.TECH ASST. PROF.OF MRCET

Time: 3 Hours Max Marks:75




SECTION - A (15*2=30Marks)


a) concrete b) wood c) white metal d) cast iron

2. Sketch with free hand, sectional front view of hexagonal headed bolt of diameter 30mm and

indicate proportionate dimensions.

3. Sketch a Oldham coupling for 25mm diameter of shaft.

SECTION-B (1*45=45MARKS)

4. The details of connecting rod as shown in fig.1. Draw the following assembled views

i) Half sectional view from the front ii) view from above

Fig.1 Details of connecting rod

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY


SUBJECT: MANUFACTURING SCIENCE

MODEL PAPER I

SECTION-A

1. 1.Describe the process of tube extrusion in brief?

2. 2.State the product applications of rolling process?

3. 3.Write about spot welding electrodes?

4. Differentiate between directional and unidirectional solidification?

5. Write the applications, advantages and limitation of gas welding?

6. 6.What is the significance of shrinkage in the production of castings?

7. 7.Define soldering, brazing and braze welding?

8. List the various welding defects which commonly occur. Discuss them in brief?

9. Explain the principle of gating system?

10. Name the different types of flame obtained in Oxy – acetylene gas welding?

SECTION-B

11. Explain the principle of gating system. Explain the function of chaplets in foundry?

(OR)

Name and describe the casting process that is widely used for making cast iron pipes?

12. What is flux generally used in gas welding? What characteristics are required for a flux?

(OR)

Differentiate between “leftward” and “rightward” technique used in horizontal welding.

How they affect the speed and quality of weld?

13. Compare among cold, warm and hot working of metals?

(OR)

Explain the terms strain hardening, recovery and recrystallization in detail?

14. Compare among cold, warm and hot working of metals?

(OR)

Explain the possible defects in rolling and suggest suitable remedies?

15. Compare hot spinning and cold spinning?

(OR)

Sketch and explain wire drawing process?




MODEL PAPER II

SECTION-A

1. What are the advantages of investment casting?

2. Discuss briefly machining of plastics?

3. Distinguish between friction in hot rolling and cold rolling.

4. Derive the forces required in extrusion process?

5. Sketch and explain various welding positions?

6. Explain the coining operation with a neat sketch?

7. Explain the working of various types of punches used in press working?

8. List the advantages and limitations of die casting?

9. What three basic types of current and polarity are used in arc welding?

10. Derive an expression for Bending force?

SECTION-B

11. With the help of suitable diagrams discuss the following casting methods.

(a)True-Centrifugal casting

(b)Semi Centrifugal casting

(c) Centrifugal Casting

(OR)

What is permeability and why is it important in molding sands?

12. List and explain the destructive tests applied in welding?

(OR)

Explain the process of thermit welding. Where would you recommend it? State and explain clearly

the controlling parameters that influence the thermit welding?

13. Explain the function of planetary hot rolling process?

(OR)

(b) How does metal act above its re-crystallizationin temperature? State the advantages of

hot working over cold working?

(c)

14. Explain the coining operation with a neat sketch?

(OR)

Describe briefly the deep drawing operation with a neat sketch? And discuss its advantages and

applications?

15. What are the similarities and differences between piercing and blanking?

(OR)

Explain the process of tube drawing with a neat sketch




MODEL PAPER III

SECTION-A

1. Write about gas welding equipment.

2. What are the essential steps in brazing operation?

3. Explain brie y the theory of work hardening?

4. Explain the process of tube - producing through rolling process?

5. Explain the thermosetting plastics and thermoplastic plastics clearly?

6. What are the criteria to be used for designing the pouring basin?

7. Describe the various additives with their uses added in plastics?

8. What are the measures to be taken to avoid arc blow?

9. Sketch and describe the use and advantages of a gated pattern

10. List the advantages of forging of metals?

SECTION-B

11. What are split and multi piece patterns? What are the advantages of making them in two or more

pieces? Give examples

(OR)

Discuss the importance of feeding distance, location, neck size and directional

solidi cation in riser design.

12. Explain various resistance welding processes?

(OR)

Write about gas welding equipment.

13. What is the main advantage of Injection moulding for thermoplastics parts as compare to hot

compression moulding?

(OR)

Explain the method used for processing of Bottle, oatable objects of thermoplastics? With neat

sketch? State its advantages

14. Why are heat-treatments given to forged components ? Explain Annealing, Hardening, tampering

in relation to forging?

(OR)

List the di erent stages in the drop forging processes in production of a component such as a spanner?

15. List the advantages of forging of metals? Why is press forging preferred over hammer forging

processes

(OR)

Explain a closed-die-forging operation in comparison to open-die-forging? Dis-cuss the main

advantages of forging over casting (or) welded parts?


DEPARTME

NT OF MECHANICAL ENGINEERING


MODEL PAPER IV

SECTION-A

1) Why do properties vary widely in most welding heat a ected zones?

2) What are split and multi piece patterns? What are the advantages of making them in two or more

pieces? Give examples.

3) Derive an expression for pressure, Torque, Power for rolling?

4) State the di erence between short and long freezing ranges. How is range determined?

5) List the advantages and limitations of die casting?

6) De ne shrinkage allowance and indicate its value for some of the common metals?

7) Explain the bending operation with neat sketch?

8) Discuss brie y the factors a ecting the rolling process?

9) What are the necessary steps involved in sand moulding? Explain.

10) What is the di erence between a consumable and non consumable electrode?

SECTION-B

11) . Explain the elements of gating system?

(OR)

Explain the advantages, limitations and applications of casting process

12) Explain the working principle, advantages and limitations of TIG welding?

(OR)

Differentiate between soldering and brazing

13) Explain about types of extrusion process?

(OR)

Types of forging process

14) Explain about different types of forging hammers?

(OR)

Explain about different types of forging defects

15) Explain About Different Types Of Rolling Mills?

(OR)

What is meant by hot working and cold working?




MODEL PAPER V

SECTION-A

1) What is a pattern? Explain suitable materials for manufacturing pattern?

2) Discuss (i) sweep pattern (ii) Gate pattern

3) Compare gas welding and gas cutting process?

4) What are the functions of core? What are various types of cores?

5) What are the three main types of metal transfers?

6) Discuss different types of press tools?

7) Discuss defects and remedies in deep drawing?

8) Explain forward and backward extrusion?

9) Discuss defects in extrusion?

10) Discuss the impact extrusion process?

SECTION-B

11) explain about permanent mould casting

(OR)

Explain the working principle of Blast furnace?

12) What are some of the commonly used shielding gases in gas tungsten arc process? Explain

their characteristics.

(OR)

Explain about Laser beam welding?

13) Differentiate thermosetting plastic and thermo plastic?

(OR)

Differentiate between hot worked and cold worked parts?

14) What are the important considerations to be taken while designing plastic parts? Discuss?

(OR)

Explain various types of drawing operations?

15) Explain different sheet metal operations?

(OR)

What is the basic difference between extrusion and drawing?

MODEL PAPER 1

SUB: INDUSTRIAL ENGINEERING

PART A

1. ANSWER THE FOLLOWING QUESTIONS

i. Define Organization?

ii. Mention any four features of management?

iii. What is Plant Location?

iv. List any four Goals of plant layout?

v. What are the functions of materials management?

vi. Discuss importance of materials management.

vii. Discuss Critical Path Method(CPM) with simple example

viii. Discuss Programme Evolution Review Technique (PERT) with simple example.

ix. What are the types of Inspection?

x. What is importance of inspection?

PART B

ANSWER THE FOLLOWIENG QUESTIONS, EACH QUESTION CARRIES 10 MARKS

2 a. Discuss committee organization, along with merits and demerits.

b. Explain matrix organization. State advantages, disadvantages and applications

3 Or

State and explain in detail the five levels in Maslow's need hierarchy.

4 What is the importance of plant location? Discuss in detail various factors affecting the plant

location.

5 Or

What are the types of plant layouts? Discuss any two with their merits and demerits.

6 What is ABC Analysis? Discuss in detail.

7 Or

Explain the purchase function and its objectives. Write purchase cycle.

8 Draw the network for the following project; it is further given that project completion

time is 42 days. Find the find the project duration. Also identify the critical path.

Activity Description Duration-days

1-2 Idea generation 7

1-3 Market survey 10

2-4 Prototype making 7

3-5 Advertising campaign 9

4-5 Distribute samples 5

4-6 Commencement of production 5

5-7 Fixing up sales outlet 7

6-7 Manufacture 14

9 Or

Given the following data, work out the minimum duration of the project and

corresponding cost.

10 (a) Explain the characteristics of Single Sampling Plain (SSP).

(b) Write a short note on control charts for variables.

11 Or

Construct �� and R Charts from the following information and state whether the process is in

control. For each of the following �� has been computed from a sample of 5 units drawn at an

interval of half an hour from an ongoing manufacturing process.

Sample 1 2 3 4 5 6 7 8 9 10

�� 20 34 45 39 26 29 13 34 37 23

R 23 39 14 5 20 17 21 11 40 10

MODEL PAPER 2


PART A

ANSWER THE FOLLOWING QUESTIONS

i. Briefly explain functions of management?

ii. Draw an Organization chart.

iii. Name any four factors affecting plant location?

iv. What are the types/methods of Production?

v. What are the objectives of inventory control?

vi. What is Inventory? Write different associate costs with the inventory.

vii. What do you understand from critical path in CPM?

viii. List different time estimates used in PERT?

ix. What is Quality?

x. What is difference between Quality and Quantity?

PART B

ANSWER THE FOLLOWIENG QUESTIONS , EACH QUESTION CARRIES 10 MARKS

2 Explain in detail functions of management.

3 Or

State and explain in detail the five levels in Maslow's need hierarchy.

4 Define production. How do production is classified? Discuss differences between job production

and batch production.

5 Or

Differentiate between product layout and process layout.

6 What are the objectives of inventory control and factors affecting inventory control function?

7 Or

Discuss in brief with a simple format of each

a) Purchase order

b) Invoice

c) Bin Card

d) Material Requisition Note

e) Goods Received/Returned Note

8 The following details relate to a small project with the help of which compute the

probability of completion of project within scheduled time. The expected time of each

activity is as follows:

9 Or

A manufacturing company is planning to introduce a new product commercially. The list

of activities to be carried out with the corresponding duration of time in weeks is listed

below.

Draw the network to represent various activities of the project, determine the minimum

duration of the project.

10 For each of the 14 days a number of magnets used in electric relays are inspected and the

number of defectives is recorded. The total number of magnets tested is 14,000. The following

are the particulars of number of defectives found every day.

Day Number Number of defectives

1

2

3

4

5

6

7

8

9

10

11

12

13

14

100

50

150

200

150

50

80

120

60

140

50

70

40

140

11 Or

What are the function of Human Resource Management/Development? Discuss Job evaluation

and brief any two types of evaluation methods.

MODEL PAPER 3


PART A


i. List out in stages of management thought?

ii. Explain relationship between authority and responsibility.

iii. What is Job Production?

iv. What is Mass Production?

v. List out different store records?

vi. What are the benefits of EMS?

vii. Write Rules referred for drawing networks?

viii. What is Float?

ix. What is variable and attributes?

x. What is the importance of identifying assignable causes in SQC and its impact in process

control?

PART B

ANSWER THE FOLLOWIENG QUESTIONS, EACH QUESTION CARRIES 10 MARKS

2 State and explain Henry Fayol’s principles of management. Identify any four principles which

you consider as very significant.

3 Or

Explain Mc-Gregor's Theory-X and Theory-Y.

4 What are the objectives and benefits of work study?

5 Or

What is method study? Discuss outline of method study presenting stages involved in method

study.

6 What is ABC Analysis? Discuss in detail.

7 Or

Discuss in brief with a simple format of each

f) Purchase order

g) Invoice

h) Bin Card

i) Material Requisition Note

j) Goods Received/Returned Note

8 A small project consists of the following activities with the given time estimates.

(a) Draw the network,

(b) Calculate the average expected time for each activity,

(c) Calculate the earliest expected time and latest allowable time for each event, and

(d) Determine the critical path considering project completion time of 36 months.

9 Or

With the help of the following data, draw the net work.

(a) draw the network

(b) Find project duration for the following project and

(c) Identify the critical path.

10 For each of the 14 days a number of magnets used in electric relays are inspected and the

number of defectives is recorded. The total number of magnets tested is 14,000. The following

are the particulars of number of defectives found every day.

Day Number Number of defectives

1

2

3

4

5

6

7

8

9

10

11

12

13

14

100

50

150

200

150

50

80

120

60

140

50

70

40

140

11 Or

Write a note on

a) Merit rating, and different methods

b) Job Description and Job Evaluation

MODEL PAPER 4


PART A


i. Mention any six principles of management given Henry Fayol?

ii. What is a flat Organization?

iii. Define Work Study.

iv. What are the Benefits of Work Study?

v. What are the benefits of ISO 14000, in brief?

vi. What is importance of total productive maintenance?

vii. What is Slack?

viii. What is dummy activity? And what is its role in network?

ix. Differentiate between assignable causes and chance causes.

x. Name charts used in studying attributes.

PART B


2 Discuss Functional organization and Line and Staff organization structure along with their

merits and demerits?

3 Or

What are the principles of organization? Discuss in detail.

4 Write various symbols and their meanings used to record the process of doing job (Process

chart).

5 Or

Explain in detail any two types recording techniques used in method study.

6 Write stages involved VED Analysis.

7 Or

What is Total Quality Management? Explain with reference to any standard organization

structure.

8 From the activity details given below, determine the optimal project duration and

optimal project cost. Indirect cost is Rs. 75 per day.

9 Or

Following data relates to a certain project.

(a) Construct the network, (b) Find the project, (c) Identify the critical path, and

(d) Find slack at each event.

10 What is OC Curve? Draw OC curve. Discuss producer’s risk and consumer risk with refence to

OC Curve.

11 Or

What is product life cycle? Explain various stages involved in product life cycle.

MODEL PAPER 5


PART A


i. Discuss in brief about virtual organization?

ii. Differentiate between organization and organizing

iii. Draw operation and storage symbols used in process chart with their meanings.

iv. What is work sampling?

v. Discuss continuous review system of inventory control?

vi. Write different types of inventories?

vii. Where do we use CPM and PERT?

viii. What is Crashing of a project?

ix. Name charts used in studying variables.

x. What is the role of ISO 9000 certification?

PART B


2 Discuss Herz Berg’s Two factor theory of motivation.

3 Or

Discuss criticism on

a) Taylor’s Scientific Management.

b) Fayol’s Principles of Management.

4 What is flow process chart? Draw flow process chart for making/manufacturing a screw.

5 Or

A work sampling study on a long cycle operation records the following data:

The total time of study = 5 days

Total Number of observations =1000

Observation of production activity = 725

Manually controlled elements =250

Total acceptable units produced =2500 pieces

Average rating index =120%

Observation of unavoidable delay =100

Calculate the standard time assuming 8 hrs working schedule per day without any overtime.

6 What is benchmarking? What are all the reasons for bench marking? How does a

benchmarking play a role in performance of an organisation?

7 Or

What are the benefits of ISO certification to the industry and to the customer? List out ISO

9000 series.

8 Crash the following project network, if overhead charges are Rs.100/day.

9 Or

For the following data related to a project, draw the network diagram. Determine the

Critical Path and expected project completion time.

10 Construct �� and R Charts from the following information and state whether the process is in

control. For each of the following �� has been computed from a sample of 5 units drawn at an

interval of half an hour from an ongoing manufacturing process.

Sample 1 2 3 4 5 6 7 8 9 10

�� 20 34 45 39 26 29 13 34 37 23

R 23 39 14 5 20 17 21 11 40 10

11 Or

Discuss the following

a) Total Quality Management

b) Quality Circle

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