單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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
D.equalizing reactor