If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the

A．cylinder compression pressure may not be high enough

B．cylinder compression temperature may be too high

C．fuel oil injection pressure may not be high enough

D．scavenge and purge process is incomplete

[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.A . cylinder compression pressure may not be high enoughB . cylinder compression temperature may be too highC . fuel oil injec

[单选题]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.A . ensure penetration and distribution of the fuel in the combustion chamberB . ensure the needle valve is flushed clean during each injectionC . prevent combust

[单选题]Fuel injection systems meter fuel, atomize fuel, and （）.A . create turbulence in the combustion chamberB . aid in completing cylinder scavengingC . inject fuel at the proper timeD . minimize fuel penetration into the cylinder

[单选题]The sequence of fuel injection into cylinders is determined by （）.A . the steeringB . the driven gearC . the turning gearD . the timing gear

[单选题]If the needle valve in a fuel injection nozzle sticks open （）.A . no fuel will be delivered through the nozzleB . the nozzle will overheat and crackC . time of injection will changeD . fuel will leak into the drain line

[单选题]A．n increase in the fuel injection pump discharge pressure can be caused by a/an _______.A．leaking delivery valveB．excessive bearing end playC．plugged injector spray holeD．increased plunger stroke

[单选题]If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.A．backfire through the air intakesB．develop less power under loadC．have high firing pressuresD．li

[单选题]The operation between two fuel injections is called a （）.A . turning cycleB . working cycleC . working hourD . working stroke

[单选题]The high pressure in fuel injection system of the diesel engine is produced by the （）.A . injector pumpB . fuel injectorC . governorD . turbocharger

[单选题]Failure of fuel injection is usually due to trouble in the （）.A . exhaust valvesB . mechanical lubricatorsC . cooling water pumpsD . fuel injection pum