Mechanical Engineering - Thermodynamics

26. 

When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

A. isothermal process
B. adiabatic process
C. free expansion process
D. throttling process

Answer: Option D

Explanation:

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27. 

Steam coal is a

A. pulverised coal
B. brown coal
C. coking bituminous coal
D. non-coking bituminous coal

Answer: Option D

Explanation:

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28. 

In a reversible adiabatic process, the ratio of T1/T2 is equal to

A.
B.
C.
D.

Answer: Option B

Explanation:

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29. 

The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

A. Ru x T
B. 1.5 Ru x T
C. 2 Ru x T
D. 3 Ru x T

Answer: Option B

Explanation:

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30. 

The atomic mass of nitrogen is __________ oxygen.

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

Answer: Option B

Explanation:

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