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Posted By: Anu Vinod Member Level: Bronze Posted Date: 05 Jan 2008
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2006 Kerala University B.Tech Production Combined first and second semester Btech degree exam 2006 Question paper
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COMBINED FIRST AND SECOND SEMESTER Btech EXAM JUNE 2006
BASIC MECHANICAL ENGINEERING (2003 SCHEME)
PART A
Answer all questions. Each question carries 4 marks.
1.Compare a heat engineand a heat pump. When do you call a heat pump a refrigerator?
2.Define entropy and show that entropy is a property of a system.
3.Sketch carnot cycle on PV and TS diagrams, and name the processes. What is its efficiency?
4.With the help of a block diagram, explain the fuel system of a diesel engine.
5.What is a fire tube boiler? Name two fire tube boilers.
6.Differentiate between Horning and Lapping.
7.Explain, briefly the working of a vapour compression refrigeration system.
8.Briefly describe the rolling process.
9.Explain the terms slip and velocity ratio with respect to the belt drive.
10.What is meant by priming of a pump? Why is it necessary in a centrifugal pump?
PART B
Answer any one question from each module. Each question carries 20 marks.
MODULE 1
11 a)Obtain an expression for ideal thermal efficiency of an otto cycle in terms of compression ratio and specific heat ratios.
b) A carnot engine, working between 650K and 310K produces 150KJ of work. Find the thermal efficiency and heat added during the process.
12 a) Prove that the efficiency of reversible engine depends on the temperature of source and sink and independ of working substance.
b)An insulated cylinder of capacity 2.8 cu. m contains 15kg of nitrogen. Paddle work is done on the gas till the pressure inside the cylinder increases from 5 bar to 10 bar. Determine
a) Change in internal energy
b) Work done
c) Heat transfer
d) Change in entropy
Assume Cp = 1.04KJ/Kg K and Cv = 0.7432 KJ/Kg K
MODULE 2
13 a) With suitable sketch, describe the Cochran boiler.
b) Calculate the volume of 3 Kg of steam at pressure of 1.3 bar. The dryness fraction of the sample of steam is 0.8. The specific volume of water at 1.3 bar is 0.00105cu.m/Kg and specific volume of dry steam is 1.325cu.m/Kg at 1.3 bar.
14. a) Describe with neat sketches the working of a simple constant pressure open cycle gas turbine.
b) Differentiate between pressure compounding and velocity compounding of steam turbine.
MODULE 3
15. a) Describe with suitable sketches, the working of a reciprocating pump.
b) Describe different types of gear trains.
16. a) Explain, with sketches, the following operations.
1) Thread cutting 2) Drilling
3) Grinding 4) Reaming
b) Explain, with neat sketch, the die casting process.
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