單項選擇題Air bubbles in a hydraulic governor can cause （）

A.sluggish response
B.speed droop variations
C.isochronous governing
D.sensitivity increase


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1.單項選擇題On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine （）

A.speed will drop drastically with any increase in load
B.will stop due to zero fuel supply
C.will stall upon application of load
D.speed will remain fairly constant despite load changes

2.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

3.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

4.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

5.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