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2014 Acharya Nagarjuna University Elements of Mechanical Engineering - Bapatla Engineering College - B.Tech 2nd Year - 2nd Semester - June 2014 Question paper

Course:   University/board: Acharya Nagarjuna University

By any chance, do you need the old question papers of Elements of Mechanical Engineering - Bapatla Engineering College - B.Tech? If you do, you are in luck. This is the original question paper from the B.Tech second year second semester exam conducted by Bapatla Engineering College in June 2014. Feel free to make a copy and use it to prepare for your upcoming exams.

II/IV B.Tech Degree Examinations, June 2014

Second Semester

Elements of Mechanical Engineering

Time : 3 hours

Maximum Marks : 60

Answer question No.1 Compulsory

Answer ONE question from each Unit

1. Answer the following [6 x 2 = 12M]
a) Explain wringing in slip gauge.
b) Explain the following with respect to gear - circular pitch and module.
c) Write the principle of resistance welding.
d) What is under filling in forging.
e) Define enthalpy.
f) Differentiate between dynamic viscosity and kinematic viscosity.

UNIT - I [1 x 12 = 12M]

2. a) What are the advantages of differential type pneumatic comparator?
2. b) Describe how you would check the 'Flatness' of a surface with an Auto collimator (OR)
3. a) Explain Geneva mechanism with a neat sketch.
3. b) Write the advantages and disadvantages of the chain drive over belt drives.

UNIT - II [1 x 12 = 12M]

4. a) Why is cleaning of metal important for successful resistance welding? Explain.
4. b) Explain the three types of oxyacetylene flames with neat sketches. (OR)
5. a) Write short notes on the following
i) A 'rise and fall' type milling machine.
ii) Double end milling machine
5. b) What is a Twist drill? Make a neat sketch of it and label its parts.

UNIT - III [1 x 12 = 12M]

6. a) In a steam engine cylinder the steam expands from 5.5 bar to 0.75 bar according to hyperbolic law, PV=Constant. If the steam is initially dry and saturated, calculate work done and heat flow to or from the cylinder walls.
6. b) Define internal energy and prove that it is a property of a system. (OR)
7. a) Derive expressions for entropy changes for a closed system in the following cases:
i) Heating a gas at constant volume.
ii) Polytropic process.
7. b) Explain irreversible process with examples.

UNIT - IV [1 x 12 = 12M]

8. a) Distinguish between manometers and mechanical gauges. What are the different types of mechanical pressure gauges.
8. b) Differentiate between forced vortex and free vortex flow. (OR)
9. State Bernoulli's theorem for steady flow of an in-compressible fluid. Derive an expression for Bernoulli's theorem from first principles and state the assumptions made for the derivation.

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