Mechanical Engineering - Thermodynamics

16. 

The most probable velocity of the gas molecules is given by

A.
B.
C.
D.

Answer: Option B

Explanation:

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17. 

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A. cut-off is increased
B. cut-off is decreased
C. cut-off is zero
D. cut-off is constant

Answer: Option C

Explanation:

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18. 

The entropy __________ in an irreversible cyclic process.

A. remains constant
B. decreases
C. increases

Answer: Option C

Explanation:

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19. 

The atomic mass of oxygen is

A. 12
B. 14
C. 16
D. 32

Answer: Option C

Explanation:

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20. 

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

A. equal to one
B. less than one
C. greater than one
D. none of these

Answer: Option C

Explanation:

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