The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequenc
A.2
B.4
C.6
D.8
A.2
B.4
C.6
D.8
A.checked
B.quickened
C.left
D.eliminated
A.in the cold
B. in the air
C. in the black
D. in the blood
“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
A.low loads necessitate frequent insulation cleaning
B.exceeding nameplate values shortens useful life
C.energy is wasted if full loading is not utilized
D.power factor correction methods are load dependent
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