Engineering Thermodynamics MCQ Questions & Answers

61

The ratio of molar specific heats for mono-atomic gas is

A) 1 B) 1.4 C) 1.67 D) 1.87

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Answer & Solution

Answer: Option C

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62

When the gas is cooled at constant pressure,

A) Its temperature increases but volume decreases B) Its volume increases but temperature decreases C) Both temperature and volume increases D) Both temperature and volume decreases

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Answer: Option D

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63

The specific heat at constant volume is

A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure C) The amount of heat required to raise the temperature of 1 kg of water through one degree D) Any one of the above

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Answer: Option A

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64

Which of the following is the correct statement?

A) All the reversible engines have the same efficiency. B) All the reversible and irreversible engines have the same efficiency. C) Irreversible engines have maximum efficiency. D) All engines are designed as reversible in order to obtain maximum efficiency.

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Answer: Option C

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65

Which of the following is the correct statement?

A) For a given compression ratio, both Otto and Diesel cycles have the same efficiency B) For a given compression ratio, Otto cycle is more efficient than Diesel cycle C) For a given compression ratio, Diesel cycle is more efficient than Otto cycle D) The efficiency of Otto or Diesel cycle has nothing to do with compression ratio

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Answer: Option B

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66

In an isothermal process,

A) There is no change in temperature B) There is no change in enthalpy C) There is no change in internal energy D) All of these

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Answer: Option D

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67

Which is the incorrect statement about Carnot cycle?

A) All the heat engines are based on Carnot cycle B) It is used as the alternate standard of comparison of all heat engines C) It provides concept of maximising work output between the two temperature limits D) All of the above

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Answer: Option A

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68

One kilowatt is equal to

A) 1 N-m/s B) 100 N-m C) 1000 N-m/s D) 1 × 106 N-m/s

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Answer: Option C

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69

Which of the following is correct?

A) Absolute pressure = Gauge pressure + Atmospheric pressure B) Gauge pressure = Absolute pressure + Atmospheric pressure C) Atmospheric pressure = Absolute pressure + Gauge pressure D) Absolute pressure = Gauge pressure - Atmospheric pressure

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Answer: Option A

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70

Which of the following is correct?

A) Gauge pressure = Absolute pressure + Atmospheric pressure B) Absolute pressure = Gauge pressure + Atmospheric pressure C) Absolute pressure = Gauge pressure - Atmospheric pressure D) Atmospheric pressure = Absolute pressure + Gauge pressure

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Answer: Option B

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering