Mechanical Engineering - Thermodynamics

21. 

Boyle's law states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

A. Agree
B. Disagree

Answer: Option B

Explanation:

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22. 

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.

A. equal to
B. less than
C. greater than

Answer: Option C

Explanation:

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23. 

The isothermal and adiabatic processes are regarded as

A. reversible process
B. irreversible process
C. reversible or irreversible process
D. none of these

Answer: Option A

Explanation:

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24. 

The variables which control the physical properties of a perfect gas are

A. pressure exerted by the gas
B. volume occupied by the gas
C. temperature of the gas
D. all of these

Answer: Option D

Explanation:

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25. 

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

A. Kelvin
B. Joule
C. Clausis
D. Gay-Lussac

Answer: Option C

Explanation:

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