Mechanical Engineering - Thermodynamics

31. 

Which of the following gas is mostly used in town for street and domestic lighting and heating?

A. Producer gas
B. Coal gas
C. Mond gas
D. Coke oven gas

Answer: Option B

Explanation:

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32. 

The value of gas constant (R) in S. I. units is

A. 0.287 J/kgK
B. 2.87 J/kgK
C. 28.7 J/kgK
D. 287 J/kgK

Answer: Option D

Explanation:

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33. 

In the first law of thermodynamics, the total energy of the system remains constant.

A. True
B. False

Answer: Option A

Explanation:

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34. 

The efficiency of Diesel cycle increases with

A. decrease in cut-off
B. increase in cut-off
C. constant cut-off
D. none of these

Answer: Option A

Explanation:

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35. 

Coal gas is obtained by mixing coal and gas at ambient conditions.

A. Yes
B. No

Answer: Option B

Explanation:

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