The supply voltage to an induction motor is reduced by 10%. By what percentage,approximately, will the maximum torque decrease
  • a)
    5%
  • b)
    10%
  • c)
    20%
  • d)
    40%
Correct answer is option 'C'. Can you explain this answer?

Electrical Engineering (EE) Question

Drishti Verma
Feb 28, 2019
T is directly proportional to square of the voltage…So Torque which can be delivered by the motor is proportional to square of the operating voltage. When the supply voltage increases by 10%, it becomes 1.1 times and therefore torque becomes 1.1^2 = 1.21 times i.e. 21% increase. When supply voltage reduces by 10%, it becomes 0.9 times, therefore torque becomes 0.9^2 times i.e. 0.81 times i.e. 19% less. Hence we can say that 10% change in supply voltage results in 20% change in torque.

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