Mechanical Engineering - Thermodynamics

26. 

The unit of power in S.I. units is kilowatt.

A. True
B. False

Answer: Option A

Explanation:

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27. 

Otto cycle consists of

A. two constant volume and two isentropic processes
B. two constant pressure and two isentropic processes
C. two constant volume and two isothermal processes
D. one constant pressure, one constant volume and two isentropic processes

Answer: Option A

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28. 

The increase in entropy of a system represents

A. increase in availability of energy
B. increase in temperature
C. decrease in pressure
D. degradation of energy

Answer: Option D

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29. 

In a free expansion process,

A. W1 - 2 = 0
B. Q1 - 2 = 0
C. dU = 0
D. all of these

Answer: Option D

Explanation:

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30. 

The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is

A. 23.97 bar
B. 25 bar
C. 26.03 bar
D. 34.81 bar

Answer: Option C

Explanation:

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