Engineering Thermodynamics MCQ Questions & Answers

51

The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of

A) 0.224 liters B) 2.24 liters C) 22.4 liters D) 224 liters

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Answer & Solution

Answer: Option C

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52

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A) Heat rejection is lower B) Expansion and compression are isentropic C) Combustion is at constant volume D) Maximum temperature is higher

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Answer & Solution

Answer: Option A

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53

Which of the following processes is irreversible process?

A) Isothermal B) Adiabatic C) Throttling D) All of the above

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Answer & Solution

Answer: Option C

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54

The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

A) Kilo Joule B) Specific heat at constant volume C) Specific heat at constant pressure D) None of these

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Answer & Solution

Answer: Option B

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55

A diathermic wall is one which

A) Prevents thermal interaction B) Permits thermal interaction C) Encourages thermal interaction D) Discourages thermal interaction

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Answer & Solution

Answer: Option B

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56

An adiabatic wall is one which

A) Prevents thermal interaction B) Permits thermal interaction C) Encourages thermal interaction D) Discourages thermal interaction

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Answer & Solution

Answer: Option A

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57

The polytropic index (n) is given by

A) $$\frac{{\log \left( {{{\text{p}}_1}{{\text{p}}_2}} \right)}}{{\log \left( {{{\text{v}}_1}{{\text{v}}_2}} \right)}}$$ B) $$\frac{{\log \left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)}}{{\log \left( {\frac{{{{\text{v}}_1}}}{{{{\text{v}}_2}}}} \right)}}$$ C) $$\frac{{\log \left( {\frac{{{{\text{v}}_1}}}{{{{\text{v}}_2}}}} \right)}}{{\log \left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)}}$$ D) $$\log \left( {\frac{{{{\text{p}}_1}{{\text{v}}_1}}}{{{{\text{p}}_2}{{\text{v}}_2}}}} \right)$$

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Answer & Solution

Answer: Option B

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58

Minimum work in compressor is possible when the value of adiabatic index ‘n’ is equal to

A) 0.75 B) 1 C) 1.27 D) 1.35

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Answer & Solution

Answer: Option B

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59

Which of the following cycles has maximum efficiency?

A) Rankine B) Stirling C) Carnot D) Brayton

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Answer & Solution

Answer: Option C

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60

No liquid can exist as liquid at

A) 273°K B) Vacuum C) Zero pressure D) Centre of earth

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Answer & Solution

Answer: Option C

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering