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Mechanical Engineering · Q95

Internal Combustion Engines (I.C. Engines)

Engineering and GATE · Mechanical Engineering · question 95

Q95

The air standard efficiency of an I.C. engine depends on

A.
Fuel used
B.
Speed of engine
C.
Compression ratio
Answer
D.
None of these

Answer: Option C

Solution

Answer: Option C
Solution:
The air standard efficiency of an I.C. engine depends on Compression ratio. The compression ratio in I.C. engine is directly proportional to the thermal efficiency, so as it increases, then its thermal efficiency will increase. The thermal efficiency of petrol and gas engines is about 30% and the thermal efficiency of diesel engines is about 70%.
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