A.slight acidity
B.slight alkalinity
C.excessive alkalinity
D.excessive acidity
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A.cold corrosion of the nozzles
B.fuel viscosity for better atomization
C.carbon accumulation on the nozzles
D.fuel detonation in the cylinders
A.the size of the holes in the fuel nozzle
B.timing of the pump
C.supply pressure to the pump
D.shape of the combustion chamber
A.fuel injectors
B.exhaust valves
C.intake valves
D.all of the above
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer
A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) nor (2)
A.acidity has increased
B.viscosity has decreased
C.demulsibility has improved
D.foaming is guaranteed to occur
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The minimum speed an engine must attain before ignition can occur depends upon （）.
Lube oil cannot be efficiently filtered if its （）.
In a simple mechanical governor, the （）.
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
What is the function of the thrust bearing?（）
An automated diesel engine should normally shut down due to （）
Routine monitoring of a diesel engine should include （）.
Maximum horsepower of a diesel engine is attained （）.
The main purpose of the piston oil scraper rings is to （）.
In using reduction gears to obtain efficient propeller speeds, （）.