单选题 The emergency generator or emergency battery is connected to( )on most large ships.

A、 distribution boards

B、 section boards

C、 emergency switch boards

D、 main switch boards

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相关试题

单选题 The rotating exciter armature is usually mounted on( )

A、a special place of the engine room

B、outside the generator

C、another exciting generator

D、a hollow shaft extension of the main generator rotor

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单选题 A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/ an ( )

A、rotor

B、stator

C、exciter

D、armature

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单选题 The operation of paralleling two alternators requires the voltages to be( )and also in phase.

A、zero

B、eliminated

C、different

D、equal

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单选题 Voltage regulation can be achieved automatically by( )

A、adjusting the level of excitation applied to the alternator field

B、adjusting the speed of generator

C、adjusting the power output of prime mover

D、adjusting the fuel feeding rate of prime mover

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单选题 Brushless generators are designed to operate without the use of( )

A、brushes

B、slip rings

C、commutators

D、all of brushes, slip rings and commutators

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单选题 The use of electric heaters in the alternator is( )

A、to warm up the alternator when starting

B、to prevent condensation on the windings when the alternator is not in use

C、to keep the alternator warm when running

D、to heat up the cooling water

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单选题 The purpose of the commutator and brushes on a DC generator is to( )

A、change AC to DC current

B、change DC to AC current

C、neutralize armature reaction

D、carry current to the outside circuit

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单选题 An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as a( )

A、magnetic amplifier

B、ship' s service alternator

C、three-wire DC generator

D、saturable core reactor

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