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A 6-pole induction machine is working as an induction generator. If the supply frequency is 60 Hz and the rotor current frequency is 5 Hz, find the speed of the rotor.

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MPPGCL JE Electrical 28 April 2023 Shift 2 Official Paper
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  1. 1400 rpm
  2. 1300 rpm
  3. 1100 rpm
  4. 1200 rpm

Answer (Detailed Solution Below)

Option 2 : 1300 rpm
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Detailed Solution

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Concept

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

The speed of an 

where, fr = Rotor induced frequency

fs = Supply frequency

s = Slip

The speed of a 3ϕ induction generator is given by:

Calculation

Given, fr = 5 Hz 

fs = 60 Hz

 

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More Induction Motor in Running Conditions Questions

Q1.A 6-pole induction machine is working as an induction generator. If the supply frequency is 60 Hz and the rotor current frequency is 5 Hz, find the speed of the rotor.
Q2.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
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Q5.The starting line current of a \(415\;V,\;3 - phase\), delta connected induction motor is \(120\;A\), when the rated voltage is applied to its stator winding. The starting line current at a reduced voltage of \(110\;V\), in ampere, is _________.

More Three Phase Induction Motor Questions

Q1.If a 6-pole induction motor operates on a 60 Hz supply, its synchronous speed is _____________.
Q2.Crawling typically causes an induction motor to operate at a speed that is: 
Q3.Which of the following modifications increases the ratio of full load torque to maximum torque in an induction motor?
Q4.In a three-phase induction motor which component represents mechanical load in the equivalent circuit?
Q5.Which of the following is a key characteristic of a slip ring induction motor?
Q6.In a Star-Delta Starter used for induction motors, the starting torque is reduced to approximately:
Q7.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?
Q8.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 _________.
Q9.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?
Q10.A 3-phase induction motor runs at 600 rpm when connected to a 3-phase, 60 Hz supply. Find the number of poles.
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