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On the Torque/Speed curve of an induction motor shown in the figure, four points of operation are marked as A, B, C and D.

Which one of them represents the operation at a slip greater than 1?

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  1. A
  2. B
  3. C
  4. D

Answer (Detailed Solution Below)

Option 1 : A
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Detailed Solution

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The torque slip characteristics are shown in the figure below.

From the given diagram in the question,

  • Point A represents the operation at a slip greater than 1.
  • Points B and C represent the operation at a slip between 0 to 1.
  • Point D represents the operation at a negative slip.

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More Induction Motor Slip 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 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?
Q3.At what value of brush shift angle, the torque produced by the repulsion motor is maximum?
Q4.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 ___________.
Q5.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
Q6.On the Torque/Speed curve of an induction motor shown in the figure, four points of operation are marked as A, B, C and D. Which one of them represents the operation at a slip greater than 1?
Q7.If the synchronous speed of a motor is 1000 rpm and the rotor speed is 970 rpm, then percentage slip is ________.
Q8.In a three-phase induction motor, if E = Back EMF and f = Supply Frequency, then the air-gap flux can be kept constant by maintaining:
Q9.The frequency of the EMF in the stator of a 4 - pole induction motor is 50 Hz and that in the rotor in 1.5 Hz. Find the speed at which the motor is running.

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?
Q4.At what value of brush shift angle, the torque produced by the repulsion motor is maximum?
Q5.On which of the following parameter, the maximum torque of a three phase induction motor does not depend?
Q6.At start, the maximum value of slip for a three phase induction motor is ________.
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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More Electrical Machines Questions

Q1.An 8-pole alternator is driven by a turbine at a speed of 1200 rpm. What is the frequency of EMF generated?
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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.It is intended to measure the resistance of the series field winding of a DC series motor accurately. Which is the most suitable method?
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