Internal Combustion Engines
An hmh flame speed is obtained in diesel engine when air fuel ratio is

Chemically correct mixture
About 10% of rich mixture
About 35% of rich mixture
Uniform throughout the mixture

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Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

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