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
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相关考题
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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 -
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
