Internal Combustion Engines
The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Heating incoming air
Scavenging
Feeding more fuel
Supercharging

ANSWER DOWNLOAD EXAMIANS APP

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

Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at bottom dead centre and ends at top dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre
May start and end anywhere

ANSWER DOWNLOAD EXAMIANS APP