Internal Combustion Engines
The brake power of a diesel engine, keeping other parameters constant, can be increased by

Increasing the pressure of intake air
Increasing the temperature of intake air
Decreasing the pressure of intake air
Decreasing the density of intake air

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

May start and end anywhere
Starts at 40° after bottom dead center and ends at 10° before top dead center
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at top dead center and ends at 40° before bottom dead center

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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

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

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