Engineering Thermodynamics MCQ Questions & Answers

91

According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

A) Change B) Do not change C) Both (A) and (B) D) None of these

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Answer & Solution

Answer: Option B

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92

The natural petroleum may be separated into

A) Petrol B) Kerosene C) Fuel oil D) Lubricating oil

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Answer & Solution

Answer: Option D

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93

One kg of carbon requires $$\frac{4}{3}$$ kg of oxygen and produces ________ kg of carbon monoxide gas.

A) $$\frac{8}{3}$$ B) $$\frac{7}{3}$$ C) $$\frac{{11}}{7}$$ D) $$\frac{{11}}{3}$$

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Answer: Option B

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94

One kg of carbon requires $$\frac{4}{3}$$ kg of oxygen and produces __________ kg of carbon monoxide gas.

A) $$\frac{8}{3}$$ B) $$\frac{{11}}{3}$$ C) $$\frac{{11}}{7}$$ D) $$\frac{7}{3}$$

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Answer: Option D

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95

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be

A) Zero B) Minimum C) Maximum D) Infinity

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Answer: Option A

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96

Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

A) Path functions B) Point functions C) Cyclic functions D) Real functions

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Answer: Option B

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97

Which of the following processes are thermodynamically reversible?

A) Throttling B) Free expansion C) Constant volume and constant pressure D) Isothermal and adiabatic

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Answer & Solution

Answer: Option D

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98

Entropy change depends on

A) Heat transfer B) Mass transfer C) Change of temperature D) Thermodynamic state

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Answer & Solution

Answer: Option A

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99

Coke is produced

A) When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel B) From the finely ground coal by moulding under pressure with or without a binding material C) When coal is first dried and then crushed to a fine powder by pulverizing machine D) By heating wood with a limited supply of air to a temperature not less than 280°C

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Answer: Option A

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100

When a gas is heated at constant pressure

A) Its temperature will increase B) Its volume will increase C) Both temperature and volume will increase D) Neither temperature not volume will increase

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Answer: Option C

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering