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


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1.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

2.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

3.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

5.單項(xiàng)選擇題Exhaust pyrometer readings provide an indication of the ()

A.effectiveness of water-cooled exhaust elbows
B.distribution of the load between engine cylinders
C.amount of fuel penetration into the engine cylinders
D.indicated horsepower of the engine cylinders