spark ignition
compression ignition
mixed engine
none of these
cetane number
octane number
calorific value
all of these
opens at 15 Degree after top dead centre and closes at 20 Degree before bottom dead centre
opens at 15 Degree before top dead centre and closes at 20 Degree after top dead centre
opens at top dead centre and closes at bottom dead centre
may open and close anywhere
not effect
decrease
increase
enhanced by decreasing compression ratio
enhanced by increasing compression ratio
dependent on other factors
none of the above