單項(xiàng)選擇題Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.

A.under high pressure
B.under low pressure
C.heated to reduce viscosity
D.cooled to increase viscosity


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1.單項(xiàng)選擇題Proper filtering and straining of fuel oil is important because the （）.

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

2.單項(xiàng)選擇題An automated diesel engine should normally shut down due to （）

A.low lube oil temperature
B.high ambient air temperature
C.low tube oil pressure
D.high exhaust system back pressure

3.單項(xiàng)選擇題The minimum speed an engine must attain before ignition can occur depends upon （）.

A.the type and size of the engine
B.the condition of the engine
C.ambient temperature
D.all of the above

4.單項(xiàng)選擇題For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

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

5.單項(xiàng)選擇題Lube oil cannot be efficiently filtered if its （）.

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