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單項(xiàng)選擇題

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

A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation

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單項(xiàng)選擇題

If a voltmeter is connected across a line, it must be protected with a（）

A.shunt
B.high-resistance coil in the armature circuit
C.low-resistance coil in the armature circuit
D.shunt and a coil of high resistance

單項(xiàng)選擇題

When current and voltage reach maximum values at the same time, the power factor is（）

A.minimum
B.maximum
C.leading
D.lagging

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