When a 3-phase AC induction motor and its driven machinery are running in one direction, plugging the control circuit to instantly reverse the rotor’s direction of rotation puts tremendous ____________ requirements on both the motor and the machinery.
The _______________ stress placed on the drive-train coupling by this reverse torque can shear the teeth off of reduction gears.
It can shear the end off of the rotor shaft or drive journals.
The _______________ stress can also stretch drive belts or chains to cause premature wear and failure.
A) torque; mechanical; electrical
B) torque; electrical; electrical
C) torque; mechanical; mechanical
D) torque; electrical; mechanical
Show Answer
Answer:C
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