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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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單項(xiàng)選擇題

The （）, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.

A.single phase
B.two phase
C.three phase
D.four phase

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