a worn cylinder
broken piston rings
any of A and B
none of the above
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 air filter
compression stroke
burned exhaust valves
all of the above
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：
cold intake air
excessive compression pressure
excessive cylinder lubrication
a light load
第5题：
a low level in the engine expansion tank
excessively high coolant pressure
improper temperatures
malfunctioning of the jacket water heater
第6题：
decreased compression pressure
increased lube oil pressure
lower lube oil temperature
excessive leakage past the piston rings
第7题：
high combustion temperature
high compression pressure
cracked cylinder liner
fuel with a high vanadium content
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：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第10题：
low air charge temperature
high cranking speed
excessive fuel dilution of lube oil
high compression pressure