單項(xiàng)選擇題In a full flow type lube oil system, the bypass relief valve will lift due to ()

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil


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1.單項(xiàng)選擇題In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by ()

A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control

2.單項(xiàng)選擇題A dirty lube oil strainer can result in()

A.crankcase
B.low lube oil temperature
C.excessive oil consumption
D.low bearing oil pressure

3.單項(xiàng)選擇題Differential needle valves used in fuel injectors are directly closed by()

A.cam action
B.spring force
C.fuel oil pressure
D.firing pressure

4.單項(xiàng)選擇題In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?()

A.An open vent in the cooling system
B.A fouled sea chest
C.A restricted water passage in the engine
D.Air entrained in the cooling water

5.單項(xiàng)選擇題Proper dispersion of fuel in a diesel engine cylinder is dependent upon the ()

A.injection pressure
B.shape of combustion space
C.turbulence in combustion space
D.all of the above