单项选择题

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

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单项选择题
The operation of paralleling two alternators requires the voltages to be （）and also in phase.

A.zero
B.eliminated
C.different
D.equal
单项选择题
The （） is a measure of the phase difference between voltage and current and is expected as the cosine of phase angle.

A.power
B.efficiency
C.effective power
D.power factor
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