单项选择题
The DC excitation to the field of brushless synchronous is generally produced by （）
A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B
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相关考题
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单项选择题
Which of the following equipment is not pollution prevention equipment?（）
A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator -
单项选择题
The initial voltage of self-excitation generator set up by（）
A.residual magnetism
B.voltage regulator
C.electrical current for excitation
D.the other running generator -
单项选择题
“380V/220V Y/△” noted on the nameplate of a non-synchronous motor means that（）
A.the armature terminals of the motor should be connected in star formation when voltage of power supply is 380
B.the armature terminals of the motor should be connected in star formation when voltage of power supply is 220
C.both A and B are correct
D.the armature terminals of the motor should be connected in reverse ways of A and B
