單項選擇題Proper operation of the main engine reduction gear set requires the operation to monitor （）

A.the sump oil level
B.oil flow sight glasses
C.bearing temperatures
D.all of the above


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1.單項選擇題Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）

A.increase blow-by in all cylinders
B.incomplete combustion in all cylinder
C.overloading in all cylinders
D.insufficient fuel delivery to all cylinders

2.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

3.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

4.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

5.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