Condition for Maximum Torque in Three Phase Induction Motor - MCQs with Answers

Condition for Maximum Torque in Three Phase Induction Motor - MCQs with Answers

Q1. The torque produced in the induction motor depends on the following factors

1. The part of rotating magnetic field which reacts with rotor and is responsible for producing emf.
2. The magnitude of rotor current in running condition.
3. The power factor of the rotor circuit in running condition.

Which of the above statement is true?

a. Only 1
b. 1 & 2
c. 2 & 3
d. 1, 2 and 3

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Q2. The torque produced in a three phase induction motor is

a. Directly proportional to the square of the induced emf in rotor
b. Directly proportional to the induced emf in rotor
c. inversely proportional to the square of the induced emf in rotor
d. inversely proportional to the induced emf in rotor

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Q3. For maximum torque, the only parameter which controls the torque is slip. The maximum torque is

a. directly proportional to the rotor resistance
b. inversely proportional to the rotor resistance
c. directly proportional to the slip times the rotor resistance
d. independent of the rotor resistance

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Q4. When the torque produced by the induction motor is at its maximum, the slip is given by

a. X2 / R2
b. (R2 + X2) / X2
c. R2 / X2
d. R2 / (R2 + X2)

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