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Internal Combustion Engines

Internal Combustion Engines
The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

Less
Same
None of these
More

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Internal Combustion Engines
The combustion in compression ignition engines is

Both (A) and (B)
Heterogeneous
None of these
Homogeneous

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Internal Combustion Engines
Compression loss in I.C engines occurs due to

Use of thick head gasket
All of these
Clogged air inlet slots
Leaking piston rings

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Internal Combustion Engines
By higher octane number of spark ignition fuel, it is meant that the fuel has

Higher heating value
Longer ignition delay
Higher flash point
Lower volatility

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Internal Combustion Engines
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

0.04
0.08
0.14
0.02

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Internal Combustion Engines
In the opposed piston diesel engine, the combustion chamber is located

Below the piston
There is no such criterion
Between the pistons
Above the piston

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