219) In a four stroke cycle diesel engine, the inlet valve

opens at 20 Degree before top dead centre and closes at 40 Degree after bottom dead centre

opens at 20 Degree after top dead centre and closes at 20 Degree before bottom dead centre

opens at top dead centre and closes at bottom dead centre

may open and close anywhere

Answer is:

opens at 20 Degree before top dead centre and closes at 40 Degree after bottom dead centre

reducing the delay period

raising the compression ratio

increasing the inlet pressure of air

all of these

Answer is:

Explanation:

The knocking in diesel engines may be prevented by
* reducing the delay period
* raising the compression ratio
* increasing the inlet pressure of air

detonation

turbulence

pre-ignition

supercharging

Answer is:

carburettor

injector

governor

none of these

Answer is:

decrease

increase

remain same

none of these

Answer is: