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
Routine monitoring of a diesel engine should include （）.
A thrust bearing is used with a propulsion diesel engine to （）.
Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
The minimum speed an engine must attain before ignition can occur depends upon （）.
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 using reduction gears to obtain efficient propeller speeds, （）.
To determine if the lube oil filter elements need changing, （）.
Proper filtering and straining of fuel oil is important because the （）.