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单选题 In an alternating current electrical system, a low system power factor is a direct sign of _______
学科：船舶电子电气专业英语2
时间：2025-12-27 00:44:33
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题目1单选题
The frequency of the induced voltages is ______ the rotational speed and the number of poles in the synchronous machineA. proportional toB. changed toC. equal toD. proper to
题目2单选题
The frequency of an AC generator is controlled by the ______A. governorB. rheostatC. capacitorD. exciter
题目3单选题
In an alternating current electrical system, a low system power factor is a direct sign of _______A. wasted energyB. efficient operationC. a short in the exciter field windingsD. an excessive number of minor system grounds
题目4单选题
The excitation of the generator is controlled by______A. an automatic voltage regulatorB. a transformerC. the reactive powerD. a governor
题目5单选题
The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the______A. reverse power relaysB. field rheostatsC. voltage regulatorsD. prime mover governors
题目6单选题
The frequency of an alternator at a given RPM is determined by the ______A. strength of the magnets usedB. number of magnetic polesC. number of turns of wire in the armature coilD. output voltage
题目7单选题
Rotor and stator of the alternator were cleaned by special cleaner, dried and painted with one coat of ______ paintA. insulatingB. dustproofC. insulatedD. waterproof
题目8单选题
The frequency of the alternating current generated by a synchronous generator is governed by the speed and the______A. power factorB. loadC. full excitationD. number of poles
题目9单选题
An electrical device which employs a stationary armature and a rotating electromagnetic field may be used aboard as a _________A. three-wire DC generatorB. saturable core reactorC. ship's service alternatorD. magnetic amplifier
题目10单选题
The field coils ___ and the armature ______. This is in fact the arrangement adopted for large, heavy duty alternatorsA. rotate; rotatesB. are stationary; is stationaryC. rotate; is stationaryD. are stationary; rotates
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