# Mechanical Engineering - Thermodynamics

### Exercise :: Thermodynamics - Section 4

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

Explanation:

No answer description available for this question. Let us discuss.

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

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

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

Explanation:

No answer description available for this question. Let us discuss.

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
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