單項選擇題The load rating of an AC generator is determined by the()

A.internal heat it can withstand
B.load it can carry continuously
C.load it is capable of supplying
D.overload it can carry for a specified time only


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2.單項選擇題When two DC generators operate in parallel, they are protected against motorizing by()

A.blow out coils
B.governor relay
C.under voltage trips
D.reverse current trips

3.單項選擇題The correct phase rotation of a three-phase alternator can be checked with a()

A.dynamometer
B.power factor meter
C.three-phase motor
D.polyphase voltmeter

4.單項選擇題A probable cause for a turbo generator tripping out on overspeed is a sudden()

A.loss of field excitation
B.total loss of load
C.large increase in load
D.loss of steam pressure

5.單項選擇題All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the()

A.temperature rise
B.input kilowatts
C.horsepower
D.operating voltage