單項(xiàng)選擇題The star-delta starter is an effective method of () voltage starting of a motor.

A.increased
B.reduced
C.unchanged
D.None of the above


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2.單項(xiàng)選擇題The operation of paralleling two alternators requires the voltages to be ()and also in phase.

A.zero
B.eliminated
C.different
D.equal

4.單項(xiàng)選擇題The overcurrent relay () the motor contactor when the motor exceeds its rated current.

A.connects
B.trips
C.fouls
D.destructs

5.單項(xiàng)選擇題In a modern three-phase A-Csynchronous brushless generator, the excitation winding is on the rotorThat means ().

A.The generator needs not excitation
B.The winding on the rotor is for inputting excitation current
C.There are three phase windings on the rotor
D.The generator has brushes