Engineering Thermodynamics MCQ Questions & Answers

71

The compression ratio for petrol engines is

A) 3 to 6 B) 5 to 8 C) 10 to 20 D) 15 to 30

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Answer & Solution

Answer: Option B

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72

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant

A) Pressure B) Temperature C) Volume D) Internal energy

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Answer: Option A

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73

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

A) Pressure B) Temperature C) Volume D) Internal energy

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Answer: Option C

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74

A definite area or a space where some thermodynamic process takes place is known as

A) Thermodynamic system B) Thermodynamic cycle C) Thermodynamic process D) Thermodynamic law

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Answer: Option A

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75

The work ratio of a gas turbine plant is given by

A) $$\frac{{{\text{Net work output}}}}{{{\text{Work done by the turbine}}}}$$ B) $$\frac{{{\text{Net work output}}}}{{{\text{Heat supplied}}}}$$ C) $$\frac{{{\text{Actual temperature drop}}}}{{{\text{Isentropic temperature drop}}}}$$ D) $$\frac{{{\text{Isentropic increase in temperature}}}}{{{\text{Actual increase in temperature}}}}$$

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Answer: Option A

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76

The mass of excess air supplied is equal to

A) $$\frac{{23}}{{100}}$$ × Mass of excess carbon B) $$\frac{{23}}{{100}}$$ × Mass of excess oxygen C) $$\frac{{100}}{{23}}$$ × Mass of excess carbon D) $$\frac{{100}}{{23}}$$ × Mass of excess oxygen

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Answer: Option D

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77

An ideal gas as compared to a real gas at very high pressure occupies

A) More volume B) Less volume C) Same volume D) Unpredictable behavior

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Answer: Option A

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78

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

A) Cracking B) Fractional distillation C) Full distillation D) Carbonisation

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Answer: Option B

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79

If the value of n = 0 in the equation pvn = C, then the process is called

A) Constant volume process B) Adiabatic process C) Constant pressure process D) Isothermal process

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Answer: Option C

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80

If in the equation pvⁿ = C, the value of n = $$ \propto $$, then the process is called

A) Constant volume process B) Adiabatic process C) Constant pressure process D) Isothermal process

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Answer: Option A

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering