The speed of rotating magnetic field of a 3ϕ, 50 Hz slip ring induction motor running at a speed of 960 rpm will be:
In order to______ semi-closed slots or totally closed slots are used in induction motors.
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Induction generators deliver power at ______ power factor
Slip ring motor is preferred over Squirrel Cage motor when
1. High starting torque is required
2. Load torque is heavy
3. Heavy pull out torque is required
Which of the statements is/are correct regarding rotating magnetic field production in a 3-phase induction machine?
1. The direction of rotation of resultant flux in the air gap depends upon phase sequence.
2. The resultant flux of constant magnitude is produced in the air gap of the motor.
3. Frequency of rotating magnetic field is not the same as that of the supply frequency
A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?
In torque-slip characteristics of an induction motor, at normal speeds close to synchronism the torque is:
Which of the following is NOT an effect of single phasing in a three-phase induction motor?
In an induction motor, if the rotor is locked, then the rotor frequency of induction motor will be:
A 4 pole induction machine is working as an induction generator. The generator supply frequency is 60 Hz. The rotor current frequency is 5 Hz. The mechanical speed of the rotor in RPM is