单项选择题
A.pure resistance B.capacitive C.inductive D.None of the above
The star-delta starter is an effective method of （） vol...
单项选择题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
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
