A. 4% in the rotor torque
B. 8% in the rotor torque
C. 12% in the rotor torque
D. 16% in the rotor torque
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A. 4% in the rotor torque
B. 8% in the rotor torque
C. 12% in the rotor torque
D. 16% in the rotor torque
This Answer Is . B
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This is due to the fact that the torque developed in the rotor is proportional to the square of the operating voltage. When the supply voltage increases by 5%, it becomes 1.052 and this will result in a 10% increase in the rotor torque.
It should also be noted that when an induction motor is directly switched on from the supply, it takes 5-7 times more current than its normal full load current and this can cause significant changes in the motor operating costs.