Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January ME 3rd Sem 76422 Basic Thermodynamics Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ME) (2018 Batch) (Sem.?3)
BASIC THERMODYNAMICS
Subject Code : BTME305-18
M.Code : 76422
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
Define thermodynamics.
2.
State the concept of temperature and equality of temperature.
3.
Define specific heat.
4.
What is mechanical equivalent of heat?
5.
What is perpetual motion machine of first kind?
6.
Define free expansion process.
7.
What is thermal reservoir?
8.
Define thermal efficiency of heat engine. Can it be 100%.
9.
What is cut-off ratio?
10. Define dryness fraction of steam.
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SECTION-B
11. State the difference between extensive, intensive and specific properties of a
thermodynamic system.
12. Write the comparison between Macroscopic and Microscopic approach.
13. An ideal gas requires 1150 kJ/kg of heat to raise its temperature from 20?C to 100?C when
heated at constant pressure. When heat is supplied to the same gas at constant volume, the
heat requirement is 825 kJ for the same temperature range. Determine the specific heat at
constant pressure, specific heat at constant volume, adiabatic exponent, characteristic gas
constant and the molecular mass of gas.
14. Define entropy and show change in entropy in an irreversible process.
15. Explain, with neat sketches, the sequence of events in the working of a two stroke petrol.
SECTION-C
16. State first law of thermodynamics and drive its analytical expression.
17. Explain throttling process and draw isenthalpic curves for a real gas and indicate there
upon the inversion curve.
18. State and explain the Carnot theorem and discuss its corollaries.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 26 June 2021