單項選擇題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


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1.單項選擇題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

3.單項選擇題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

4.單項選擇題Fuel oil discharged to the diesel engine cylinder is atomized at the ()

A.turbocharger
B.injection nozzle tip
C.carburetor
D.fuel oil pump

5.單項選擇題Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the ()

A.fuel nozzle holders
B.exhaust value guides
C.engine cylinder liners
D.low temperature and a low viscosity