单项选择题

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

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单项选择题

Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）

A.Baffle plates that have been bent during prior removal
B.Leaks in the cooler tube nest
C.Operating the engine while maintaining a high sea water outlet temperature
D.A punctured sea water strainer supplying cooling water to the heat exchanger

单项选择题

Gear-type flexible couplings are often used in diesel engine drive trains because they（）

A.require no lubrication under normal operating conditions
B.compensate for gross misalignment in the drive train
C.are able to transmit high torque ,even where slight misalignment exists
D.will rapidly disconnect the engine from the line shaft

单项选择题

Keel coolers fouled with marine growth, will result in （）

A.higher raw water temperatures
B.higher jacket water temperatures
C.a malfunctioning thermostat
D.higher fuel temperature