單項(xiàng)選擇題Current measuring instruments must always be connected in ()

A.series with a circuit
B.parallel with a circuit
C.series-parallel with a circuit
D.delta with the shunt


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1.單項(xiàng)選擇題The primary function of an electric motor is to ()

A.develop torque
B.generate high voltages
C.produce a magnetic field
D.generate high electrical resistance

2.單項(xiàng)選擇題The power factor at which a paralleled AC generator operates is usually adjusted by the ().

A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage

4.單項(xiàng)選擇題Equal power factors on paralleled AC generators are maintained by an automatic ().

A.voltage regulator
B.reverse power relay
C.reverse current relay
D.governor control switch

5.單項(xiàng)選擇題To equalize the power factor of two alternators operating in parallel, the ()

A.field excitation of both units is adjusted
B.governors of both units are adjusted
C.phase sequence is altered
D.kilowatt load is evenly divided

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