The voltage output of an AC generator is controlled by()
- Avarying the DC exciter voltage
- Bvarying the reluctance of the air gap
- Cregulating the speed of the prime mover
- Dshorting out part of the armature winding
The voltage output of an AC generator is controlled by()
1、Voltage generated by most AC generator
Voltage generated by most AC generators is fed from the machine to the bus by means of().Abrushes on a commutatorBbrushes on slip ringsCslip rings on a commutatorDdirect connections from the stator
2、The output voltage of a three-phase al
The output voltage of a three-phase alternator is regulated by the ().AAC voltage to the armatureBAC voltage to the fieldCDC voltage to the armatureDDC voltage to the field
3、The nameplate of an AC non-synchronous
The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequency 50HzYou can infer that the number of magnetic poles is()A2B4C6D8
4、When securing an AC generator, you sho
When securing an AC generator, you should FIRST ().Aopen the generator circuit breakerBswitch the voltage regulator to manualCdecrease the field excitation to minimumDreduce the load on the unit
5、Prior to starting an AC generator prim
Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the ()Amanual positionBbus neutral positionCraise voltage positionDtransfer positio
6、The output voltage of a 440 volt, 60 h
The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the ().Aprime mover speedBexciter output voltageCload on the alternatorDnumber of pole