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
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A.2
B.4
C.6
D.8
A.in such cases, the air supply is no longer optimal, the thermal load will be higher
B.governor hunting will occur
C.torsional vibrations as other mechanical vibrations may occur
D.all of the above are correct
A few spots of turbocharger can be caused by（）
①crash stop of engine
② rapid increased of engine speed
A.①only is correct
B.②only is correct
C.both ① and ②are correct
D.neither ① or ② correct
A.improve power factor
B.reduce voltage oscillation
C.increase the insulation of circuits
D.eliminate regenerated magnetic fields
A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above
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