单项选择题
A.increased B.reduced C.unchanged D.None of the above
The （）, cage rotor induction motor is the first choice ...
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
The operation of paralleling two alternators requires t...
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
The （） is a measure of the phase difference between vol...
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
