by injection pumps
at a time decided by the injection pump timing
by a signal opening the magnetic valves
at a time decided by the cam directly
第1题：
Fuel has been injected but ignition fails. The possible cause may be ______.
A.slightly leaky exhaust valve
B.increased scavenging air temperature
C.engine cylinders not scavenged sufficiently
D.too much water in the fuel oil
第2题：
spark plugs
glow plugs
heat of compression
a magneto
第3题：
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.
A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion
第4题：
fine atomization
high temperature
good mixing of fuel and air
all of the above
第5题：
vacuum pressure
specific gravity
heat
viscosity
第6题：
quantity of fuel injected is decreased
quantity of fuel injected will always be increased
start of injection is advanced
duration of injection will always be greater
第7题：
stop engine
finished with engine
dead slow ahead
dead slow astern
第8题：
When fuel is injected late into a diesel engine cylinder_______.
A.the exhaust will be clear
B.fuel consumption will be low
C.all the fuel will be burned at top dead center
D.fuel consumption will be high
第9题：
a shortened ignition delay period
a lean fuel/air mixture
excess fuel in the combustion chamber
rapid vaporization of injected fuel droplets
第10题：
Move the fuel control mechanism to the no fuel position
Block the fuel supply by closing the master fuel valve
Shut off the fuel supply and block the flow of intake air
Relieve all pressure in the fuel system