單項(xiàng)選擇題

AC and DC generators are similar in that they （）

A.both generate alternating voltages
B.both rectify the voltage before delivery
C.are constructed at the same physical size for the same kilowatt rating
D.both supply three-phase power

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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

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