單項(xiàng)選擇題

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

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“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

單項(xiàng)選擇題

The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequency 50HzYou can infer that the number of magnetic poles is（）

A.2
B.4
C.6
D.8