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In a 3-phase induction motor, the rotor induced EMF per phase (Er) is equal to:

(Where Eo is rotor induced EMF at standstill and s is slip)

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MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper
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  1. sEo
  2. Eo
  4. sEr

Answer (Detailed Solution Below)

Option 1 : sEo
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Detailed Solution

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Concept

The EMF induced in the rotor of an induction motor is given by:

where, Er = Rotor induced EMF

Eo = Standstill EMF

s = Slip

The slip 's' is given by:

Ns = Synchronous speed

Nr = Rotor speed

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More Three Phase Induction Motor Questions

Q1.A three-phase induction motor is operating at a slip of 0.05 at full load. During the run, if the phase sequence of the supply is reversed, then what is the slip at the instant of reversal?
Q2.A three-phase, 440 V, 6 pole, slip ring induction motor operates with 2% slip and takes a stator current of 50 A. The speed of the motor is reduced at constant torque to 500 rpm using stator voltage control. The new value of the stator current will be _________.
Q3.A 400 V, 50 Hz, three-phase induction motor runs at a slip of 0.06 when it is driving a constant load torque. With what slip will it run driving the same load if the voltage applied is reduced to 200 V, neglecting stator resistance and the equivalent reactance of the motor?
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Q7.Why starters are required in induction motors?
Q8.An induction machine has 4 poles and is operating at a speed of 1475 rpm and 50 Hz frequency. The machine is operating at a slip of ___________.
Q9.If the supply voltage becomes half of its initial value, the torque delivered by a three phase induction motor _____________.
Q10.The rotor voltage of a slip-ring induction motor gives 120 oscillations per minute when the motor is connected to 3-phase, 50 Hz supply. The percentage slip of the rotor is
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