题目内容（请给出正确答案）

[主观题]

An alternator is being paralleled with one on the line At the instant the circuit breaker

is close, the frequency of the incoming alternator will normally

A.increase

B.not change

C.decrease

D.be exactly 60 hertz

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更多“An alternator is being paralle…”相关的问题

第1题

The frequency of an alternator at a given RPM is determined by the ______.A.number of turn

The frequency of an alternator at a given RPM is determined by the ______.

A.number of turns of wire in the armature(电枢) coil

B.number of magnetic poles

C.strength of the magnets used

D.output voltage

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第2题

The correct phase rotation of a three-phase alternator can be checked with a .A.dynamomete

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

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第3题

The full authority digital engine control FADEC system is self-powered by（）

A.A permanent magnet alternator when N2＞ 15%

B.A permanent magnet alternator when N2＞12%

C.A permanent magnet alternator when N1＞ 15% C

D. The emergency lighting system can be tested from

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第4题

The output voltage of a three-phase alternator is regulated by the _____.

A.AC voltage to the armature

B.AC voltage to the field

C.DC voltage to the armature

D.DC voltage to the field

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第5题

any pointer positionDue to failure of one of the carbon brushes the excitation voltage is lost on one alternator that operating in parallel.Then that alternator will（)

A.completely loose its share of the load causing the auxiliary engine to speed up.

B.overload due to reduced voltage output and increased current

C.continue to share the active load(kw)but have high very reactive load

D.try to take all the load and so trip the main circuit breaker

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第6题

The frequency of an AC generator is adjusted by means of the _____.A.main alternator field

The frequency of an AC generator is adjusted by means of the _____.

A.main alternator field rheostat

B.exciter field rheostat

C.prime mover governor control

D.equalizing reactor

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第7题

Please answer this question.

A、The emergency alternator is to be tested at blackout.

B、The emergency alternator is to be tested each week.

C、The emergency alternator is to be tested at full load.

D、The emergency alternator is to be tested for 1 hour.

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第8题

The frequency of an alternator is controlled from the main switchboard by adjusting the___

__.

A.frequency meter

B.voltage regulator

C.governor control

D.sychroscope switch

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第9题

The frequency output of an operating alternator is controlled by the _____.A.relative spee

The frequency output of an operating alternator is controlled by the _____.

A.relative speed of the rotor poles

B.number of turns of wire in the armature coil

C.strength of the magnets used

D.output voltage

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