单选题A fuel injection valve opening at pressure lower than normal will result in（）.A late fuel injectionB early fuel injectionC high exhaust temperature from that cylinderD decreased effective stroke from that injector

When using a fuel with a higher than normal sulfur content in an auxiliary four stroke diesel engine, you may

A.maintain higher than normal jacket water temperature

B.change the lube oil more frequently than normal

C.maintain a higher air-box temperature than normal

D.maintain a higher air-box pressure than normal

_______can cause oil flow from water outlet of the oil purifier.

A.Oil inlet valve opening too quickly

B.Oil temperature little higher than normal

C.Diameter of gravity disc too small

D.Viscosity of oil little lower than normal

High cylinder firing pressure, accompanied by low exhaust temperature, can result from ___.

A.improper fuel rack positing

B.lengthy exhaust valve duration

C.extend operation at light load

D.excessively early injection timing

Springs in fuel injectors will become not strong enough to work because______.

A.the injector opens at a lower pressure than designed

B.the needle valve and seat wear out

C.the nozzle holes wear out

D.long time in use

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