# IC Engine Questions and Answers – Air Standard Cycles

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This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Air Standard Cycles”.

1. The air standard efficiency of an I.C. engine depends on _____________
a) fuel used
b) speed of engine
c) compression ratio
d) none of the mentioned

Explanation: None.

2. The specific fuel consumption per B.P. hour for a petrol engine is about ___________
a) 0.2 kg
b) 0.25 kg
c) 0.3 kg
d) 0.35 kg

Explanation: Generally, the specific fuel consumption per B.P. hour for a petrol engine is about 0.25 kg while the specific fuel consumption per B.P. hour for a diesel engine is about 0.2 kg.

3. The specific fuel consumption per B.P. hour for a diesel engine is about ___________
a) 0.2 kg
b) 0.25 kg
c) 0.3 kg
d) 0.35 kg

Explanation: Generally, the specific fuel consumption per B.P. hour for a diesel engine is about 0.2 kg while the specific fuel consumption per B.P. hour for a petrol engine is about 0.25 kg.
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4. If the compression ratio in I.C. engine increases, then its thermal efficiency will ___________
a) increase
b) decrease
c) remain same
d) none of the mentioned

Explanation: The compression ratio in I.C. engine is directly proportional to the thermal efficiency, so as it increases, then its thermal efficiency will increase.

5. The thermal efficiency of petrol and gas engines is about ___________
a) 15%
b) 30%
c) 50%
d) 70%

Explanation: The thermal efficiency of petrol and gas engines is about 30% and the thermal efficiency of diesel engines is about 70%.

6. The thermal efficiency of diesel engines is about ___________
a) 15%
b) 30%
c) 50%
d) 70%

Explanation: The thermal efficiency of diesel engines is about 70% while the thermal efficiency of petrol and gas engines is about 30%.

7. The thermal efficiency of diesel engines on weak mixtures is ___________
a) unaffected
b) lower
c) higher
d) dependent on other factors

Explanation: None.

8. The volumetric efficiency of a well designed engine may be ___________
a) 30 to 40%
b) 40 to 60%
c) 60 to 70%
d) 75 to 90%

Explanation: None.

9. The working medium of an air standard cycle has constant ___________ throughout the cycle.
a) pressure
b) volume
c) specific heat
d) mass

Explanation: None.

10. It is assumed that all the processes of an air standard cycle are ___________
a) reversible
b) irreversible
d) isothermal

Explanation: None.

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