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
第2题
A.checked
B.quickened
C.left
D.eliminated
第3题
A.in the cold
B. in the air
C. in the black
D. in the blood
第4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
第5题
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
第6题
A.68.7A
B.59.1A
C.70A
D.75A
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