单项选择题

To increase the frequency of an operating AC generator, you should （）

A.increase the field excitation
B.decrease the field excitation
C.increase the number of magnetic poles
D.increase the speed of the prime mover

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单项选择题

When measuring AC current flow, you must always connect the meter （）

A.in series with the power source and load
B.in parallel with the power source and load
C.insuring correct polarity
D.using the lowest range possible to prevent instrument damage

单项选择题

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
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When the current flow through a copper wire increases, its （）

A.resistance will decrease
B.insulation will bum
C.temperature will increase
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