insufficient fuel supply due to fuel pump valves sticking or leaking
excessive mechanical clearance between the piston crown and cylinder head
excessively worn fuel pump plunger
excessive exhaust back pressure
第1题：
Low compression in a diesel engine could be caused by
A.worn or broken cylinder liner sealing rings
B.high cooling water temperature
C.worn or broken piston rings
D.low fuel oil pressure
第2题：
clogged coolant passages
a leaking cylinder head gasket
low fuel oil pressure
worn or broken cylinder liner sealing rings
第3题：
Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?
A.compression must be low for effective spark ignition
B.compression must be low for required horsepower and torque generation
C.compression must be low to prevent pre-ignition
D.compression must be low to have effective pre-ignition
第4题：
carbon buildup in the exhaust manifold
overcooling of the exhaust manifold
eroded muffler baffle plates
high injection pressure
第5题：
clogged air filter
compression stroke
burned exhaust valves
all of the above
第6题：
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
第7题：
high compression pressure
low intake air temperature
low exhaust pressure
high scavenge air pressure
第8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 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
第9题：
prevent engine back pressure at heavy loads
increase total engine efficiency at low loads
prevent boiler corrosion at low engine loads
improve engine fuel consumption at any load
第10题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner