单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）A increase engine powerB increase engine loadC decrease engine powerD improve fuel economy

When fuel is injected late into a diesel engine cylinder_______.

A.the exhaust will be clear

B.fuel consumption will be low

C.all the fuel will be burned at top dead center

D.fuel consumption will be high

Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.

A.prolong the ignition delay period

B.ensure the beginning of fuel injection

C.thoroughly utilize the air charge

D.allow controlled fuel combustion

Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by______.

A.using fuel oil with low cetane number

B.a badly worn piston pin

C.a loose flywheel key

D.a loose bed plate bolt

If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the

A.fuel line connections to the cylinder injection valves

B.gasket surfaces of the fuel oil filters

C.discharge fittings of the fuel injector pumps

D.suction side of the fuel oil transfer pump