單項(xiàng)選擇題

The voltage output of an AC generator is controlled by（）

A.varying the DC exciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of the prime mover
D.shorting out part of the armature windings

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單項(xiàng)選擇題

If two AC generators are operated in parallel, the load is distributed evenly by（）

A.a rheostat
B.a balancing coil
C.changing field excitation
D.adjusting the governor settings

單項(xiàng)選擇題

What would the amps be at 240 volts with an 8 ohm resistance?（）

A.32~5 amps
B.25 amps
C.1~5 amps
D.30 amps