Mechanical Engineering - Thermodynamics

26. 

The amount of heat generated per kg of fuel is known as

A. calorific value
B. heat energy
C. lower calorific value
D. higher calorific value

Answer: Option A

Explanation:

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27. 

Carnot cycle has maximum efficiency for

A. petrol engine
B. diesel engine
C. reversible engine
D. irreversible engine

Answer: Option C

Explanation:

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28. 

The entropy may be expressed as a function of

A. pressure and temperature
B. temperature and volume
C. heat and work
D. all of these

Answer: Option A

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29. 

It is __________ to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

A. possible
B. impossible

Answer: Option B

Explanation:

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30. 

Which of the following is the correct statement?

A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.

Answer: Option C

Explanation:

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