(DME 311)
B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014
(Examination at the end of Third Year Third Semester)
MECHANICAL ENGINEERING Paper – I: Operations Research
Time : 3 Hours Maximum Marks : 75
Question No.1 is compulsory (15)
Answer one question from each unit (4x15=60)
1) Write short notes on:
a) Limitations of operations research.
b) Unbounded solution.
c) Vogel’s approximation.
d) Arrow Diagram.
e) Min-max principle.
UNIT-I
2) Describe model building in operations Research in detail.
OR
3) Explain Graphical method and infeasible solution.
UNIT-II
4) Give a brief explanation on transportation problem.
OR
5) Show that how can Queing theory is done in different models.
UNIT-III
6) Explain Arrow Diagram representation in detail.
OR
7) Explain Pert and CPM and Critical Path calculations.
UNIT-IV
8) Solve the game whose pay – off matrix is given by graphical method.
B1 B2 B3 B4
A1 4 -2 3 -1
A2 -1 2 0 1
A3 -2 1 -2 0
OR
9) a) Explain the characteristics of D.P model.
b) Limitations of operations research.
E E E
(DME 312)
B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014
(Examination at the end of Third Year Third Semester)
MECHANICAL ENGINEERING Paper – II: Design of Machine Elements
Time : 3 Hours Maximum Marks : 75
Question No.1 is compulsory (15)
Answer one question from each unit (4x15=60)
1) Write a short note on the following:
a) Standardization in design.
b) Preferred numbers and their significance.
c) Importance of factor of safety in design.
d) Goodman diagram.
e) Types of power screws.
UNIT-I
2) a) What is factor of safety? Why is it necessary? Why a very small or a large factor of
safety should not be used?
b) Explain types of designs in machine elements.
OR
3) A load on a bolt consists of an axial pull of 10kN together with a transverse shear force of
5 kN. Find the diameter of the bolt required with respect to
a) Maximum strain energy theory.
b) Max. principal stress theory
Take permissible tensile stress at elastic limit = 100 MPa and poission’s Ratio = 0.3.
UNIT-II
4) a) Discuss various methods of reducing stress concentration.
b) A pulley is keyed to a shaft midway between two antifriction bearings. The bending
moment at the pulley varies from 250kN-m to 750 kN-mm and the torsional moment
in the shaft varies from 100 kN-mm to 300 kN-mm. The frequency of the variation
of the load is same as the shaft speed. The shaft is made of cold drawn steel having
an ultimate strength of 550 N/mm2 and yield strength of 450N/mm2. Determine the
required diameter for an infinite life. The stress concentration factor for the key way
in bending and torsion may be taken as 1.8 and 1.5 respectively. The factor of safety
is 2.0. Take size factor = 0.85 and surface finish factor = 0.88.
OR
5) Explain the design procedure for fluctuating stresses.
UNIT-III
6) Design a triple riveted double cover plate with unequal cover plates butt joint for
logitudinal seam of a boiler if the inside diameter of largest course of the drum is 1m and
steam pressure is 1.9 MPa. Assume the allowable stresses as = 60 MPa. t = 80 MPa &
c = 130 MPa.
OR
7) Explain the design procedure for eccentrically loaded welded joints.
UNIT-IV
8) Design a sleeve and cotter joint to resist a tensile load of 50 kN. Assume the stresses as
follows: = 55 MPa, t = 65 MPa & c = 140 MPa. Draw the freehand sketch of the joint
showing important dimensions.
OR
9) Explain the design procedure for joints under eccentric loading.
E E E
(DME 313)
B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014
(Examination at the end of Third Year Third Semester)
MECHANICAL ENGINEERING Paper – III : Machine Dynamics
Time : 3 Hours Maximum Marks : 75
Answer question No.1 is compulsory (15)
Answer one question from each unit (4x15=60)
1) Write a short note on the following:
a) Four – link mechanism.
b) Dynamic Balancing.
c) Distinguish between absorption and transmission dynamometers.
d) Controlling force in governor.
e) Gynoscopic couple.
UNIT-I
2) a) What is meant by a dynamically equivalent system.
b) Explain the slides crank mechanism.
OR
3) Determine the required input torque on the crank of a slides – crank mechanism for the
static – equilibrium when the applied piston load is 1500N. The lengths of the crank and
the connecting rod are 40 mm and 100 mm respectively the crank has turned through 45o
from the inner dead centre.
UNIT-II 4) Two weights of 8 kg and 16 kg rotate in the same plane at radii of 1.5 and 2.25m
respectively. The radii of these weights are 60o a part. Find the position of the third weight
of the magnitude of 12 kg in the same plane which can produce static balance of the
system.
OR
5) The pistons of a 60o twin V – engine has strokes of 200 mm. The mass of the reciprocating
parts per cylinder is 1 kg and the speed of the crank shaft is 2500 rpm. Determine the
magnitude of the primary and secondary forces.
UNIT-III
6) Explain the types of Belt transmission dynamometers.
OR
7) The moment of Inertia of an aeroplane oil screw is 20 kg – m2 and the speed of rotation is
1000 rpm clock wise 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 aeroplane when it makes a left –
handed turn on a path of 150m radius.
UNIT-IV
8) Explain the working of porter Governor with neat sketch.
OR
9) a) Justify the proell Governor is better than porter Governor.
b) Explain the significance of sensitiveness of a Governor.
E E E
(DME 314)
B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014
(Examination at the end of the Third Year Third Semester)
MECHANICAL ENGINEERING Paper – IV : Hydraulic Machines
Time : 3 Hours Maximum Marks : 75
Answer question No.1 is compulsory (15)
Answer one question from each unit (4x15=60)
1) Write a short notes on the following:
a) Classification of fluid machines.
b) Draft tube theory.
c) Pump losses.
d) Hydraulic accumulator.
e) Model laws.
UNIT-I
2) Show that when a jet of water Impinges on a series of curved vanes, maximum efficiency
is obtained when the vane is semi – circular in section and the velocity of a vane is half of
that jet.
OR
3) A 7.5 cm diameter jet having a velocity of 30 m/s strikes a flat plate, the normal of which
is inclined at 45o to the axis of the jet. Find the normal force exerted on the plate.
a) When plate is stationary.
b) When plate is moving with a velocity of 15 m/s in the direction of jet away from the jet.
c) Also determine the power and efficiency of system when the plate in moving.
UNIT-II
4) a) Compare and constrast impulse and reaction turbines.
b) A Kaplan turbine working under a head of 15m develops 7357.5 kw shaft power. The
outer diameter of the runner is 4m and hub diameter 2m. The guide blade angle at the
extreme edge of the runner is 30o. The hydraulic and overall efficiencies of the
turbine are 90% and 85% respectively. If the velocity of whirl is zero at outlet,
determine:
i) Runner vane angles at inlet and outlet at the extreme edge of the runner and
ii) Speed of the turbine. OR
5) A pelton wheel working under a head of 500m has an overall efficiency of 85% and runs at
400 rpm, and develops 7000 kw of power. Taking the bucket speed as 0.47 times the jet
speed and assuming Cv = 0.97 find
a) The wheel diameter and
b) The jet diameter. Assume any other data if necessary.
UNIT-III
6) a) What are multistage centrifugal pumps? Compare them with pumps arranged in
parallel.
b) Discuss the following of a centrifugal pump
i) Main characteristics curves. ii) Operating characteristic curves.
iii) Constant efficiency curves. iv) NPSH.
OR
7) a) Explain condition in which two pumps may be operated in series or in parallel.
b) What is a multistage pump and what are its advantages.
UNIT-IV
8) With suitable sketch explain hydraulic ram. List different types of Hydraulic rams.
OR
9) a) Explain Froude laws.
b) Types of models – Discuss.
E E E
(DME 315)
B.Tech. DEGREE EXAMINATION, NOV./DEC. - 2014
(Examination at the end of Third Year Third Semester)
MECHANICAL ENGINEERING Paper – V: I.C. Engines and Gas Turbines
Time : 3 Hours Maximum Marks : 75
Answer question No.1 is compulsory (15)
Answer one question from each unit (4x15=60)
1) a) Draw a line sketch of C.I. Engine and name the parts.
b) What is a carburettor? State the limitations of simple carburettor.
c) What is the importance of specific fuel consumption?
d) Define the combustion?
e) Draw the P- diagram for C.I. engine.
f) Differentiate between positive displacement type and dynamic rotary compressors.
g) State the advantages and disadvantages of gas turbines over IC engines.
UNIT-I
2) a) What is meant by cylinder row and cylinder bank.
b) With neat sketches explain the working principle of four – stroke spark – ignition
engine.
OR
3) a) List out the limitations of simple carburetor and explain how these are over come in
modern carburetors.
b) With a simple layout explain the Bosch K Tentronic injection system.
UNIT-II
4) a) What is the importance of specific fuel consumption.
b) A four cylinder engine running at 1200rpm delivers 20 kw. The average torque when
one cylinder was art is 110 N-m. Find the indicated thermal efficiency if the calorific
value of the fuel is 43 MJ/kg and the engine uses 360 grams of gasoline per kwh.
Calorific value of fuel is 43000 kJ/kg.
OR
5) a) Explain the difference between gross calorific value and net calorific value.
b) The volumetric analysis of a fuel gas is: CO2 = 14%; CO = 1% O2 = 5% and N2 =
80%. Calculate the fuel gas composition by weight.
UNIT-III
6) Bring out clearly the process of combustion in C.I. engines and also explain the various
stages of combustion.
OR
7) a) What is a centrifugal compressor? How does it differ from an axial flow compressor?
b) What is a slip factor and a pressure co-efficient? Explain.
UNIT-IV
8) a) Describe with neat sketches the working of a simple constant pressure open cycle gas
turbine.
b) Enumerate the various uses of gas turbines.
OR
9) a) What do you mean by jet propulsion ? State the fundamental difference between the
jet propulsion and rocket propulsion.
b) Explain the thrust power propulsive efficiency and Thermal Efficiency.
E E E
(DME 316) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Third Semester)
MECHANICAL ENGINEERING
Paper-VI : Metal Cutting & Machine Tools
Time : 03 Hours Maximum Marks : 75
Answer Question No. 1is compulsory. (15)
Answer ONE question from each unit. (4 x 15 = 60)
1) a) What are the functions of a machine tool?
b) How is the size of a lathe specified?
c) List the common lathe operations which can be carried out on a lathe.
d) What is the function of a drilling machine?
e) Principle of shaper.
f) What is superfinishing?
g) Different tool materials.
UNIT-I
2) a) Explain briefly the parts of a Lathe.
b) Determine the time taken to turn a 50mm diameter by 70mm long workpiece of
the cutting speed is 45m/min and the feed is 0.5mm/revolution. One cut is to
be considered.
OR
3) a) What are the differences between a turret lathe and a capstan lathe?
b) Determine the time taken to face a workpiece of 72mm diameter. The spindle
speed is 80 rpm and crossfeed is 0.3 mm/revolution.
UNIT-II
4) a) What is the difference between ‘counter boring’ and ‘counter sinking’ operations?
b) How are the machining time and material removal rate in a drilling machine calculated?
OR
5) a) Discuss the working principle and operation of a shaper.
b) Explain briefly with neat sketches various types of grinding machines.
UNIT-III
6) Explain about universal milling machine. List its advantages and limitations.
OR
7) With neat sketches explain about various operations performed on milling machine.
List their applications.
UNIT-IV
8) a) Explain the nomenclature of single point cutting tool.
b) Give the comparison between ‘orthogonal cutting’ and ‘oblique cutting’.
OR
9) a) On what factors does the tool life depend?
b) What are the requirements of a cutting fluid?
c) What are the characteristics of an ideal cutting-tool material?
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(DME 321) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper - I : Operations Management
Time : 03 Hours Maximum Marks : 75
Answer any Five of the following.
All questions carry equal marks.
1) Explain the merits of linear regression and correlation coefficient methods of
forecasting.
2) Give an account of different kinds of production systems.
3) Bring out mathematical models of planning.
4) Describe the formation of master scheduling.
5) Enumerate the functions of materials management.
6) Elucidate the importance of MRP and CRP.
7) How are safety and buffer stocks fixed?
8) Explain the multisampling plans for attributes.
9) What are the factors that affect reliability?
10) Describe the uses of control charts for variables.
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(DME 322) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper-II : Design of Transmission Elements
Time : 03 Hours Maximum Marks : 75
Question No. 1is compulsory. (15)
Answer ONE question from each unit. (4 x 15 = 60)
1) Write a short note on the following:
a) Types of Lubrications.
b) Types of Bearings.
c) Selection of pulleys.
d) Lewis equation in Helical gears.
e) Terminology in worm gears.
UNIT-I
2) Explain the design procedure of hollow shafts under torsion and axial loads.
OR
3) a) Explain the procedure for square key design.
b) A medium carbon steel shaft transmits 25kw at 450 rpm. The diameter of shaft is 40mm. A square key is used whose one side is equal to 1/4th the shaft diameter and whose length is equal to 1-5 times the shaft diameter. Find the dimensions of the key and check the key for the induced shearing stress and crushing stress.
UNIT-II
4) a) Discuss in detail about materials and applications of journal bearing.
b) A journal bearing 150mm diameter and 300mm long carries a radial load of 9kN at 1200 rpm. The diametral clearance is 0.075mm. If 6kw is being lost in friction, what is the viscosity of the oil used at given operating temperature.
OR
5) Explain the selection procedure of ball and roller bearings.
UNIT-III
6) A V-belt drive is to be arranged between two shafts with 1.2m as centre distance.
The driving pulley is of 250mm diameter and is to be supplied with 20 kw power at
960 rpm. The follower pulley is to run at 460 rpm.
Determine the number of belts required from the following:
Area of belt cross section = 143 mm2
Mass density of the belt material = 1000 kg/m3
Permissible tensile stress = 2 N/mm2
Coefficient of friction = 0.3
Groove angle of the pulley = 40o
OR
7) a) Explain different types of chain drives.
b) List the advantages of chain drives over belt drives.
UNIT-IV
8) a) Define i) axial pitch of the worm ii) lead of the worm and
iii) lead angle of the worm, as applicable to worm gearing.
b) Explain briefly strength design of worm gear teeth, wear load capacity of a
worm drive with suitable equations.
OR
9) A cast iron helical gear with 30o helix angle has to transmit 20kw at 1200 rpm. The
safe static stress for cast iron is 55 MPa. The width of face is 3.5 times circular
pitch. If the gear has 24 teeth determine the following for 20o full depth teeth.
a) Module
b) Pitch diameter
c) Width of face
d) Indth rust, assume lubrication factor = 1.15.
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(DME 323) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper-III : Mechanical Vibrations
Time : 03 Hours Maximum Marks : 75
Answer Question No. 1 is compulsory. (15)
Answer ONE question from each unit. (4 x 15 = 60)
1) a) Explain Beats phenomenon.
b) What is stiffness of spring?
c) Discuss logarithmic decrement.
d) Rayleigh-Ritz method.
e) Types of damping.
UNIT-I
2) a) What effect does a decrease in mass have on the frequency of a system?
b) A cylinder of mass M radius r rolls without slipping on a cylindrical surface of
radius R. Find the natural frequency for small oscillation about the lowest point.
OR
3) a) Define the terms generalized impedance and admittance of a system.
b) Find the steady state response of undamped single degree freedom system
subjected to the force F(t) = Fo eiwt by using the method of Laplace
transformation.
UNIT-II
4) A machine mounted on springs and fitted with a dashpot has a mass of 60kg. There
are three springs, each of stiffness 12 N/mm. The amplitude of vibrations reduced
from 45 to 8 mm in two complete oscillations. Assuming that the damping force
varies as the velocity determine
i) The damping coefficient.
ii) The ratio of frequencies of damped and undamped vibrations and
iii) The periodic time of damped vibrations.
OR
5) Derive an expression for determining the critical speed of a light shaft having a
single disk without damping.
UNIT-III
6) a) What are vibration absorbers? Explain the working principle of a centrifugal
pendulum vibration absorber with the help of a neat sketch.
b) For damped free vibration system, derive the equation for amplitude for over-
damped and critically damped system.
OR
7) A cantilever shaft 50mm diameter and 300mm long has a disc for mars 100kg at its
free end. The Young’s modulus for the shaft material in 200 GN/m2. Determine the
frequency of longitudinal and transverse vibrations of the shaft.
UNIT-IV
8) a) How is the frequency equation derived for a multi degree of freedom system.
b) For a taut string having tension T and three concentrated masses as shown
below, use the method of influence numbers to find the three natural
frequencies. Find also the mode shapes. Check on the orthogonal properties of
the normal modes.
OR
9) Explain the multidegree of freedom system using Dunkerley’s method.
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(DME 324) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper-IV : Basic Electronics & Microprocessors
Time : 03 Hours Maximum Marks : 75
Answer Question No. 1is compulsory.
Answer ONE question from each unit. (4 x 15 = 60)
1) a) How does a zener diode work in forward bias condition draw VIchs in forward
bias condition. (2)
b) Define α and β of a BJT. (2)
c) Give the ideal operational amplifier characteristics. (2)
d) What is a multivibrator. (2)
e) (FB81)16 = ( )8 = ( )10. (2)
f) What is a latch? (1)
g) Draw a SR flip flop. (2)
h) What does HALT and JUMP instructions perform. (2)
UNIT-I
2) a) Draw and explain the input and output characteristics of BJT in CE
configuration.
b) Explain the VI characteristics of JFET.
OR
3) a) Explain how a zener diode can be used as a voltage regulator.
b) Explain the action of a transistor as an amplifier.
UNIT-II
4) a) Explain the working of a Wien bridge oscillator using neat figures.
b) How does an op amp work as an integrator and differentiator.
OR
5) a) With a neat sketch explain the operation of a Bistable multivibrator.
b) Explain the working of a Colpitts oscillator.
UNIT-III
6) a) Explain the working of a half adder with the help of truth table.
b) Draw and explain a JK flip flop.
OR
7) a) Give the significance of semi conductor memories.
b) Explain the working of a multiplexer.
UNIT-IV
8) a) Explain the addressing modes of 8085.
b) Write a program to multiply two 8 bit numbers.
OR
9) a) Explain the Instruction set of 8085.
b) Write a program to subtract two given numbers.
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(DME 325) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper-V : Heat Transfer
Time : 03 Hours Maximum Marks : 75
Question No. 1 is compulsory. (15)
Answer ONE question from each unit. (4 x 15 = 60)
1) Write a short note on the following:
a) Differentiate between the thermodynamics and Heat Transfer.
b) What is Stefan’s Boltzmann law?
c) Define Biot number. What is the significance of this number.
d) State the Navier-Stokes education.
e) Define Grashof number and explain its significance in free convection heat
transfer.
f) Define overall heat transfer co-efficient ‘U’.
g) Define the terms absorptivity, reflectivity and transmittivity of radiation.
UNIT-I
2) a) Explain the electrical analogy of heat transfer. Illustrate the concept of
electrical analogy considering a multilayer composite wall.
b) Consider a 4m 6m 0.3m thick brick wall whose k = 0.8 W/mK. The
temperature of inner and outer surfaces of the wall are measured to be 45oC
and 25oC respectively. Find the rate of the heat transfer through the wall.
OR
3) a) Derive the general heat conduction educations systems and hence deduce the
expression for temperature distribution through a plane wall.
b) Consider a 1.2m 2m glass window of 6mm thick having k = 0.75 W/mK,
which is exposed to environment at 20oC with a convective heat transfer co-
efficient of 10 W/m2K. If the inner surface temperature of the glass is at 5oC.
Find the outer surface temperature and rate of heat leak into the room.
UNIT-II
4) a) Distinguish between steady state and unsteady state conduction.
b) A long aluminium cylinder 5.0cm in diameter and initially at 200oC is suddenly
exposed to a convection environment at 70oC and h = 525 W/m2k. Calculate
the temperature at a radius of 1.25cm, 1 min after the cylinder is exposed to the
environment.
OR
5) a) Explain Reynolds analogy and cal burn analogy.
b) Air at a temperature of 30oC flows over a flat plate of length 1m and width 2m
with a velocity of 3 m/s. Determine the direction of air i.e; along its length or
width that will create maximum drag force.
UNIT-III
6) a) Explain the difference between parallel flow and counterflow heat exchangers
and show how the temperature of the two fluids vary along the path of flow.
b) In a food processing plant a brine solution is heated from 12oC to 6.5oC in a
double pipe parallel flow heat exchanger by water entering at 35oC and leaving
20.5oC at the rate of 9 kg/min. Determine the heat exchange area for an overall
heat transfer co-efficient of 860 W/m2K. For water Cp = 4.186 kJ/kg K.
OR
7) a) Discuss various theoritical and empirical educations available to predict natural
convection heat transfer co-efficient.
b) The outer surface of a vertical is tube which is of length 1.25m and outer
diameter 50mm is exposed to saturated steam at atmospheric pressure. The
surface is maintained at 80oC by the flow of cooling water through it.
Determine the rate of heat transfer to the coolant and the rate at which the
steam is condensed at the tube surface. If the tube is held in horizontal
position, will there be any change in the mass of condensate.
UNIT-IV
8) a) What is shape factor with respect to itself if the surface is concave, convex or
flat?
b) A room measuring 3m 4m 2m high has the ceiling covered with heating
panels. Under steady state conditions, the ceiling is at a temperature of 50oC
and the walls and floor at a temperature of 20oC. Assuming all the surfaces
have an absorptive of units, calculate the net radiant heat transfer from the
ceiling.
OR
9) a) State and prove Kirchoff’s law. What are the limitations to use it?
b) A black body is maintained at 200oC. Calculate i) Total emissive power ii)
Wave length at which maximum monochromatic power occurs and iii)
Maximum monochromatic emissive power.
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(DME 326) B.Tech. DEGREE EXAMINATION, NOV. / DEC. - 2014
(Examination at the end of Third Year Fourth Semester)
MECHANICAL ENGINEERING
Paper-VI : Engineering Metrology
Time : 03 Hours Maximum Marks : 75
Answer Question No. 1is compulsory. (15)
Answer ONE question from each unit. (4 x 15 = 60)
1) Write a short note on the following:
a) Types of Fits.
b) How do you calibrate the slip gauges.
c) Principle of limit gauges.
d) Indexing jig.
e) Sources of errors in gear manufacturing.
f) Application of Tool makers microscope.
g) Advantages of CMM.
UNIT-I
2) a) Distinguish between straightness and flatness. List out the methods of
measuring each of these.
b) What are the different elements of engineering measurements?
OR
3) a) Explain about angle gauges and its applications.
b) Explain with sketch, how sine bar can be used to measure a taper angle.
UNIT-II
4) Explain the design considerations while selecting jigs & fixtures.
OR
5) a) Explain the gear shaping principle and its advantages.
b) Describe a gear tooth-vernier calliper and show how this is used for checking
gears.
UNIT-III
6) a) Define ‘effective diameter’ and ‘best size wire’, derive an expression to
determine the best size wire diameter.
b) Explain with sketch the principle and working of an auto collimator.
OR
7) With the help of sketch describe how tool maker’s microscope can be used to
measure the elements of screw threads.
UNIT-IV
8) Explain various methods of measuring surface finish.
OR
9) Explain various instruments required for performing the alignment tests on machine
tools.
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