later and close sooner
sooner and close later
sooner and close sooner
later and close later
第1题:
point of opening
speed of opening
lift from its seat
all of the above
第2题:
fuel pumps
cylinders
fuel strainers
all of above
第3题:
If a diesel engine turned over freely but failed to start, the cause could be ________.
A.water in the fuel
B.cold lube oil
C.excessive starting air pressure
D.excessive fuel pressure
第4题:
fuel lines
lube oil filter
crank case pump
rocker arm reservoir
第5题:
excessively late injection timing for each cylinder
incorrectly adjusted intake valve timing
incorrectly adjusted fuel injector
incorrectly adjusted intake valve clearance
第6题:
the engine is overloaded
the engine is cold
there is too much lube oil in the cylinders
the turbocharger is fouled
第7题:
clogged lube oil piping
excessive valve-guide clearance
high lube oil viscosity
low lube oil temperature
第8题:
increase
decrease
remain the same
increase on compression decrease on expansion
第9题:
most critical in a four-stroke cycle diesel engine
most critical in a two-stroke/cycle diesel engine
most critical in a four-stroke/cycle diesel engine if it is turbocharged
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
第10题:
increased engine breathing efficiency
excessive valve lash
excessive lube oil consumption
lower than normal fuel consumption