AC 3 PHASE INDUCTION MOTOR - Practice Mode

1) Which speed of 3-phase induction motor runs?

Above synchronous speed Below synchronous speed Equal to synchronous speed At slip speed

Correct Answer: Below synchronous speed

2) What is the value of slip at the time of starting of 3 phase induction motor?

Two Three One Zero

Correct Answer: One

3) Which is directly proportional to torque in 3 phase induction motor?

Rotor power factor Stator frequency Number of poles Supply voltage

Correct Answer: Rotor power factor

4) What is phase angle difference between three windings in three phase squirrel cage induction motor?

360 Degree 90 Degree 120 Degree 30 Degree

Correct Answer: 120 Degree

5) Which material is used to wound outer cage rotor bars of a double squirrelcage induction motor?

Brass Aluminium Copper Silicon steel

Correct Answer: Brass

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