Engineering Thermodynamics MCQ Questions & Answers

1

The efficiency of Diesel cycle with decrease in cut-off

A) Increases B) Decreases C) First increases and then decreases D) First decreases and then increases

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Answer & Solution

Answer: Option A

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2

Otto cycle consists of

A) Two constant volume and two isentropic processes B) Two constant pressure and two isentropic processes C) Two constant volume and two isothermal processes D) One constant pressure, one constant volume and two isentropic processes

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Answer & Solution

Answer: Option A

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3

Stirling cycle consists of

A) Two constant volume and two isentropic processes B) Two constant volume and two isothermal processes C) Two constant pressure and two isothermal processes D) One constant volume, one constant pressure and two isentropic processes

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Answer & Solution

Answer: Option B

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4

Carnot cycle consists of

A) Two constant volume and two isentropic processes B) Two isothermal and two isentropic processes C) Two constant pressure and two isentropic processes D) One constant volume, one constant pressure and two isentropic processes

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Answer & Solution

Answer: Option B

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5

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

A) Zero B) $$\frac{1}{5}$$ C) $$\frac{4}{5}$$ D) 1

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Answer & Solution

Answer: Option A

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6

Reversed Joule cycle is known as

A) Carnot cycle B) Bell-Coleman cycle C) Rankine cycle D) Stirling cycle

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Answer & Solution

Answer: Option B

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7

The same volume of all gases would represent their

A) Densities B) Specific weights C) Molecular weights D) Gas characteristic constants

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Answer: Option C

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8

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

A) More B) Less C) Equal D) Depends on other factors

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Answer & Solution

Answer: Option C

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9

The compression ratio for Diesel engines is

A) 15 to 20 B) 5 to 8 C) 3 to 6 D) 20 to 30

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Answer & Solution

Answer: Option A

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10

The efficiency of the Carnot cycle is (where T₁ and T₂ = Highest and lowest temperature during the cycle)

A) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} - 1$$ B) $$1 - \frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}}$$ C) $$1 - \frac{{{{\text{T}}_2}}}{{{{\text{T}}_1}}}$$ D) $$1 + \frac{{{{\text{T}}_2}}}{{{{\text{T}}_1}}}$$

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Answer: Option C

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering