M.tech MD SEM II MID I ImportantQuestions

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1

DEPARTMENT OF MECHANICAL ENGINEERING

Course: M.TECH – MACHINE DESIGN – SEM-II - Regulation:R13

Subject : ADVANCED MECHANICS OF MACHINERY

Reference Books: Theory of Machines and Mechanisms/ J.E Shigley and J.J . Uicker

Jr./ McGraw-Hill, 1995

UNITS: 1 - 2

PART – A Question

1. a) Explain the term Collineation axis and its use for finding inflection points.

b) Describe the Bobilliers construction to find the centre of curvature when instant centre, Tracer

point and the inflection point are known.

c) State and explain Freudenstein’s Collineation axis theorem.

d) Explain briefly the Hall’s and Aulf’s Auxiliary point method for the analysis of mechanisms

PART – B Questions

1. Explain briefly about the mobility criterion for planar mechanisms with examples.

2. With the help of neat sketches describe the type of elements and joints of robotic manipulator.

3. Explain the Hartmann’s construction to find the inflection circle for a given mechanism.

4. What is Circling – point curve? Find the radius of curvature for a circling point curve.

5. Derive the polode curvature (general case) for fixed polode.

6. What is inflection circle? Explain the analytical procedure to find the inflection circle diameter.

7. Derive the Euler – Savary 1st

and 2nd forms of equations.



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Course: M.TECH – MACHINE DESIGN - Regulation:R13

Subject : MECHANICAL VIBRATIONS

Reference Books: Theory and Practice of Mechanical Vibrations/JS Rao & K. Gupta/New Age

Intl. Publishers/Revised 2nd Edition (B.B)

UNITS: 1 - 2

PART – A Question

1. a) Prove that with equal amplitudes at resonance, the structural damping factor is equal to twice the

viscous damping factor.

b) An electric motor of mass 40 kg is running at 600 rpm. The motor is supported on a spring of 8

KN/m and a dashpot which offers a resistance of 800 N at 0.45m/sec. The unbalance of the rotor is

equivalent to a mass of 0.9 Kg located 6 cm from the axis of rotation. Knowing that the motor is

constrained to move vertically, determine (i) the damping factor, (ii) amplitude of vibration and phase

angle, and (iii) resonant speed and resonant amplitude.

2. a) What methods are available for solving the governing equations of a vibration problem?

b) A small reciprocating machine of 50 kg mass runs at constant sped of 8000 rpm. After installation

the forcing frequency was found to be too close to the natural frequency of the system. Design a

dynamic absorber if the closest frequency of the system is to be at least 15% from the disturbing

frequency.

3. State and explain principle mode of vibrations.

4. What are the advantages of the Laplace transform method?


2. Derive the expressions for the equation of motion for a single degree spring mass damper system

subjected to free vibration for different damping conditions.

3. Derive the expression for logarithmic decrement in a single degree spring mass system subjected to free

damped vibrations.

4. Discuss the following. a)Vibration Isolators b) Critical Speed with damping

5. Determine the two natural frequencies for the vibrating system shown in figure 1. Assume m1=1kg,

m2=2kg, k

1=3 k

2= 2k

3=80N/m.



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Course: M.TECH – MACHINE DESIGN-SEM-II- Regulation:R13

Subject : ADVANCED OPTIMIZATION TECHNIQUES AND APPLICATION

Reference Books: Optimization theory & Applications/ S.S Rao/ New Age International

UNITS: 1 - 2

PART – A Question

1. a) Mention the drawbacks of Fibonacci method.

b) Distinguish between regional elimination methods with point estimation methods.

c) Write short notes on

(i) Golden section method

(ii) Fibonacci search method

d) Define gradient of function. Explain its importance


1. Maximize the quadratic function f(x, y) = -x2 + xy - y2 + 1 along a direction [Δx = 0; Δy = 1]

from the point [x0 = 1; y0 = 0] using direct search method.

2.

3.

4.

5.

6. by univariant

method

7. using Hooke and jeeves method

8.



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9. Solve the following problem by steepest descent method Min .

Take a starting point as (1,1).

10. State the possible convergence criteria that can be used in direct search methods.

11. Indicate the number of one-dimensional steps required for the minimization of the

According to Random search method.

12. Use Golden Section method to find the minimum of f(x) = x2 – 4x+1 in the (0, 5). Show

calculations for mix cycles and determine the achieved accuracy.



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Course: M.TECH – MACHINE DESIGN-SEM-II - Regulation:R13

Subject : EXPERIMENTAL STRESS ANALYSIS

Reference Books: Theory of elasticity / Timoshenko and Goodier Jr

PART – A Question

1. a) What are the conditions of plane stress and plane strain?

b) At a point the principal stresses are 1400N/m2 and 750 N/m2 both tensile. Find the normal and

tangential stresses on a plane inclined at 60o to the axis of the major principal stress.

2. Explain working principle of telemetry systems.

3. Write short notes on the following

a) Electrical resistance strain gauges.

b) Stress –separation method


1. a) Write a short notes on plane stress and plain strain problem b) If a displacement field is described by

u = (-6x2

y+ 8xy2

+ 6xy)

v = (6yx+2x3

y- 4xy2

)

Determine the ∈x, ∈

y, and xyγ at the point x =3, y = 4 also find the stresses xyσσ if E = 2.5 x 10

5

N/m2

,

υ=0.30. [12]

2. a) Describe the advantages and disadvantages of a strain gauge fabricated using an isoelastic alloy. List

four different carrier materials used in strain gauge construction.

b) Determine the power which can be dissipated by a semiconductor strain gauge 1.5 mm long. If the

gauge resistance is 600 ohms, determine the current passing through the gauge and the voltage drop

across the gauge when the maximum power is being dissipated.

3. a) Derive the equilibrium equations for a 3D elastic body.

b) If a displacement field is described as follows,

u = (-3x2

y + 7y2

x2

+ 6xy) and v = (6xy2

+8yx3 – y2

)

Determine the strain components ∈x, ∈

y, and γ

xy at the point x =2, y = -3.

4. a) Outline the two methods which can be used to compensate for temperature induced apparent strains in

semiconductor strain gauges.

b) The strain sensitivity of most metallic alloys is about 2. What portion of this sensitivity is due to

dimension changes in the conductor? What portion is due to changes in the number of free electrons and

their mobility.

5. Four strain gauges are mounted on a steel tension specimen having a cross sectional area of 6 mm2

to

produce a load cell. If two of the gauges are mounted in the axial direction and the other two in the

transverse direction, and if the gauge factor for all gauges is 2.05. What gauge factor should be dialed

into a manual null balance strain indicator so that it will give a direct reading of the load P applied to the

tension load cell?



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Course: M.TECH – MACHINE DESIGN- Regulation:R13

Subject : DESIGN SYNTHESIS ELECTIVE – III

Reference Books: Engineering Design a material and processing approach by George

dieter,mcgraw hill international book company 1983

UNITS: 1 - 2

PART – A Question

1. a) Explain the significance of interchangeability.

b) Write short notes on variant design

c) Write short notes on conceptual design

d) Write short notes on standardization


1. Define design synthesis and distinguish between design synthesis and design analysis.

2. What is standardization and what are its advantages? Give any four examples of the standards used in

the design office.

3. What is the difference between interchangeability and selective assembly? Where is each one used?

Explain with one example for each?

4. What should be the method of design if a component has more than one possibilities of failure?

Discuss with a suitable example?

5. How do you calculate the stresses due to interference fits? Explain the procedure in detail?

6. A 50mm OD X 28mm ID steel hub is to be assembled on a 28mm diameter steel shaft with a heavy

press fit, not using a selective assembly. Determine the tolerance, interference,and dimensions of the

mating parts?

7. Differentiate between design variables and design constraints.



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Course: M.TECH – MACHINE DESIGN –SEM-II - Regulation:R13

Subject : MECHATRONICS ELECTIVE – IV

Reference Books: Mechatronics – N. Shanmugam / Anuradha Agencies Publishers

UNITS: 1 - 2

PART – A Question

1.a) Discuss the design considerations and trade-offs in preparing the mechatronic system in industrial

application.

b) Explain the working of an automatic washing machine with a block diagram.

2. a) Explain the principle of operation of inductive sensor and capacitive sensor.

b) Explain the working principle of potentiometer and accelerometer.1.Explain the principle of operation

of inductive sensor and capacitive sensor.

3. Write short notes on the following.

(a) Intelligent machine Vs. Automatic machine

(b) Adaptive control

(c) System design classification


1. a) State the reasons for requirement mechatronics and explain various applications of mechatronics.

b) Explain various control system configurations in brief. Briefly explain various types of surface

manipulation techniques.

2. a) What is the difference between microprocessor and plc?

b) Explain the logic functions of or gate and not gate in relation to plc.

3. a)What is difference between human interface and human machine interface?

b) Explain the working and construction of digital transducer.

4. Write short note

a) Applications of transducers in Manufacturing systems

b) Machine –machine interfacing devises.

5. Explain the control parameters and system objectives of Mechatronic systems.

6.a) Describe Digital sensors used in motion measurement.

b) Explain the features and pattern recognition methods in machine vision.

M.tech MD SEM II MID I ImportantQuestions

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