单项选择题
With a （） load the voltage and current are in phase.
A.pure resistance
B.capacitive
C.inductive
D.None of the above
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The star-delta starter is an effective method of （） voltage starting of a motor.
A.increased
B.reduced
C.unchanged
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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
