單項選擇題The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）

A.determine the need for filter cleaning
B.measure any change in oil viscosity
C.prevent damage to the filter
D.determine the need for batch filtration


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1.單項選擇題Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?（）

A.Lubrication systems using engine driven lube oil pumps do not require any additional independent arrangement when such arrangements have been proven reliable
B.The use of engine driven pre-lube pumps is permitted on vessels with propulsion systems developing less than 500 shaft horsepower
C.When forced lubrication is used for propulsion engines, one independently driven stand-by pumps is to be provided in addition to the necessary pumps for normal operation
D.Lubrication systems where two oil coolers are fitted require a minimum of two temperature control devices which may be actuated by similar sensors

2.單項選擇題If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

A.a broken shaft on the freshwater pump
B.an excessive accumulation of scale exchanger
C.an incorrect thermostatic element operating range
D.lube oil in the cooling water

3.單項選擇題The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）

A.varying the pump discharge pressure
B.varying the pump return pressure
C.rotation of the pump plunger
D.rotation of the pump barrel

4.單項選擇題On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）

A.accumulator spring compressor
B.balance piston
C.compensating needle valve
D.proportional piston

5.單項選擇題Which of the following adjustments is always required whenever the diesel engine governor oil has been drained and renewed?（）

A.speed droop
B.compensation
C.idle speed setting
D.load limit control