Engineering Thermodynamics MCQ Questions & Answers

31

The __________ is obtained when carbonization of coal is carried out at 500° to 700° C.

A) Soft coal B) Hard coal C) Pulverized coal D) Bituminous coal

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Answer & Solution

Answer: Option A

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32

When a gas is heated at constant volume

A) Its temperature will increase B) Its pressure will increase C) Both temperature and pressure will increase D) Neither temperature nor pressure will increase

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Answer & Solution

Answer: Option C

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33

In a reversible adiabatic process, the ratio of $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}}$$ is equal to

A) $${\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\gamma - \frac{1}{\gamma }}}$$ B) $${\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)^{\gamma - \frac{1}{\gamma }}}$$ C) $${\left( {\frac{{{{\text{v}}_2}}}{{{{\text{v}}_1}}}} \right)^{\gamma - \frac{1}{\gamma }}}$$ D) $${\left( {\frac{{{{\text{v}}_1}}}{{{{\text{v}}_2}}}} \right)^{\gamma - \frac{1}{\gamma }}}$$

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Answer & Solution

Answer: Option B

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34

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

A) Less than B) Equal to C) More than D) None of these

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Answer & Solution

Answer: Option C

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35

The processes occurring in open system which permit the transfer of mass to and from the system, are known as

A) Flow processes B) Non-flow processes C) Adiabatic processes D) None of these

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Answer & Solution

Answer: Option A

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36

Which of the following is not the intensive property?

A) Pressure B) Temperature C) Density D) Heat

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Answer & Solution

Answer: Option D

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37

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

A) Divided by its molecular weight B) Multiplied by its molecular weight C) Multiplied by its density D) Multiplied by its specific weight

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Answer & Solution

Answer: Option B

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38

When the gas is heated at constant pressure, the heat supplied

A) Increases the internal energy of the gas B) Increases the temperature of the gas C) Does some external work during expansion D) Both (B) and (C)

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Answer & Solution

Answer: Option D

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39

When the gas is heated at constant volume, the heat supplied

A) Increases the internal energy of the gas and increases the temperature of the gas B) Does some external work during expansion C) Both (A) and (B) D) None of these

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Answer & Solution

Answer: Option A

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40

Kinetic theory of gases assumes that the collisions between the molecules are

A) Perfectly elastic B) Perfectly inelastic C) Partly elastic D) Partly inelastic

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Answer & Solution

Answer: Option A

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering