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A change of 5% in supply voltage to a 3 phase induction motor will produce the appropriate change in the torque of-
- a)5%
- b)7.5%
- c)10%
- d)25%
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A change of 5% in supply voltage to a 3 phase induction motor will pr...
A change of 10% in supply voltage to a 3 phase induction motor will produce the appropriate change in the torque of the stable operating region of the motor is increased instead of simply running at its base rated speed the motor can be run typically from 5% of the synchronous speed up to the base speed the torque generated by the motor can be kept constant throughout this region.
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Hence, the correct option is (C)
Most Upvoted Answer
A change of 5% in supply voltage to a 3 phase induction motor will pr...
Explanation:
The torque of a 3 phase induction motor is proportional to the square of the supply voltage. Therefore, a change in supply voltage will result in a change in torque.
The formula for torque in a 3 phase induction motor is:
T = (3 x V x I x cosφ)/(2 x π x f)
Where,
T = Torque
V = Supply voltage
I = Current
cosφ = Power factor
f = Frequency
As we can see from the formula, torque is directly proportional to the supply voltage. Therefore, a change in supply voltage will result in a proportional change in torque.
If the supply voltage is increased by 5%, then the torque will also increase by 5%. Similarly, if the supply voltage is decreased by 5%, then the torque will decrease by 5%.
Therefore, the appropriate change in torque for a change of 5% in supply voltage is 5%.
Conclusion:
A change of 5% in supply voltage to a 3 phase induction motor will produce the appropriate change in the torque of 10%.
The torque of a 3 phase induction motor is proportional to the square of the supply voltage. Therefore, a change in supply voltage will result in a change in torque.
The formula for torque in a 3 phase induction motor is:
T = (3 x V x I x cosφ)/(2 x π x f)
Where,
T = Torque
V = Supply voltage
I = Current
cosφ = Power factor
f = Frequency
As we can see from the formula, torque is directly proportional to the supply voltage. Therefore, a change in supply voltage will result in a proportional change in torque.
If the supply voltage is increased by 5%, then the torque will also increase by 5%. Similarly, if the supply voltage is decreased by 5%, then the torque will decrease by 5%.
Therefore, the appropriate change in torque for a change of 5% in supply voltage is 5%.
Conclusion:
A change of 5% in supply voltage to a 3 phase induction motor will produce the appropriate change in the torque of 10%.
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