单项选择题

A.Routine supervisory labor particularly the unproducti……

Which of the following is NOT the advantages of the remote control and automation of engine operations?（）

A.Routine supervisory labor particularly the unproductive night-service labor is reduced
B.Engine mal-operation is automatically sensed and manned
C.The engine room need be manned at night in bad weather or close waters
D.Some remedial measures can be taken automatically

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单项选择题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

单项选择题The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）

A.full excitation
B.load
C.power factor
D.number of poles

单项选择题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

单项选择题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

单项选择题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