improperly seating intake valves
leaking cylinder liner seal rings
late fuel injection timing
carbon deposits on the piston
第1题：
A smoking exhaust from an operating diesel engine could be caused by( ).
A.low sulfur content in the fuel
B.a loose injector inlet connection
C.late fuel injection
D.high injection 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：
high combustion temperature
high compression pressure
cracked cylinder liner
fuel with a high vanadium content
第5题：
vacuum pressure
specific gravity
heat
viscosity
第6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7题：
high compression pressure
low intake air temperature
low exhaust pressure
high scavenge air pressure
第8题：
Combustion knock occurring in a diesel engine can be caused by _____.
A.low coolant temperature
B.insufficient fuel
C.high ambient temperature
D.carbon buildup on the injector tips
第9题：
clogged air filter
compression stroke
burned exhaust valves
all of the above
第10题：
a leaking fuel injector nozzle
a clogged air filter
excessively early fuel injection
malfunctioning valves