The supply voltage to an induction motor is decreased by 10%. By what percentage, approximately, will the maximum torque decrease?(a) 5%(b) 10%(c) 20%(d) 40%The question was asked by my school teacher while I was bunking the class.Query is from Synchronous Machine Stability in division Synchronous Machine Stability of Electrical Machines

The supply voltage to an induction motor is decreased by 10%. By what

1.	The supply voltage to an induction motor is decreased by 10%. By what percentage, approximately, will the maximum torque decrease?(a) 5%(b) 10%(c) 20%(d) 40%The question was asked by my school teacher while I was bunking the class.Query is from Synchronous Machine Stability in division Synchronous Machine Stability of Electrical Machines
Answer» Right ANSWER is (C) 20% To elaborate: TORQUE is proportional to V^2. Torque will change by TWICE percentage of the change in voltage i.e. 20%.

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