The frequency of an AC generator is co

1、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

2、The frequency of an alternator is cont

The frequency of an alternator is controlled from the main switchboard by adjusting the（）Afrequency meterBvoltage regulatorCgovernor controlDsychroscope switch

3、To increase the frequency of an operat

To increase the frequency of an operating AC generator, you should （）Aincrease the field excitationBdecrease the field excitationCincrease the number of magnetic polesDincrease the speed of the prime mover

4、The purpose of DC generator brushes is

The purpose of DC generator brushes is to （）.Aneutralize armature reactionBconduct electric current to an outside circuitCconvert DC current to AC currentDprovide excitation to a DC generator

5、What is the effect of the following ac

What is the effect of the following access list condition access-list 101 permit ip 10.25.30.0 0.0.0.255 any（）。Apermit all packets matching th...

6、The voltage output of an AC generator

The voltage output of an AC generator is controlled by（）Avarying the DC exciter voltageBvarying the reluctance of the air gapCregulating the speed of the prime moverDshorting out part of the armature winding