A.under high pressure
B.under low pressure
C.heated to reduce viscosity
D.cooled to increase viscosity
您可能感興趣的試卷
你可能感興趣的試題
A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil
D.dirty fuel will clog the intake air filter
A.low lube oil temperature
B.high ambient air temperature
C.low tube oil pressure
D.high exhaust system back pressure
A.the type and size of the engine
B.the condition of the engine
C.ambient temperature
D.all of the above
A.it has a longer power stroke
B.more air gets into the cylinder each stroke
C.it develops twice as many power strokes at the same speed
D.higher combustion pressure is developed
A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs
最新試題
White smoke exhausting from an operating diesel engine may indicate （）.
Combustion knock occurring in a diesel engine can be caused by （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
Routine monitoring of a diesel engine should include （）.
If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
In a simple mechanical governor, the （）.
An automated diesel engine should normally shut down due to （）
What is the function of the thrust bearing?（）