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In a 3-ϕ induction motor, the ratio Pi : Pc : Pg is equal to:

(Where Pi = Rotor Input, PC = Rotor Copper Losses, and Pg = Gross Mechanical Output)

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MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper
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  1. s : (1 - s) : 1
  2. 1 : (1 - s): s
  3. 1 : s : (1 - s)
  4. (1 - s) : 1 : s

Answer (Detailed Solution Below)

Option 3 : 1 : s : (1 - s)
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Detailed Solution

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Power flow in Induction Motor

where, Pg = Air gap Power

Pc = Rotor copper loss

Pd = Developed Power 

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More Rotor Cu Losses Questions

Q1.In which of the following motor resistance is added in rotor circuit to change its speed?
Q2.In a 3-ϕ induction motor, the ratio Pi : Pc : Pg is equal to: (Where Pi = Rotor Input, PC = Rotor Copper Losses, and Pg = Gross Mechanical Output)
Q3.The ratio of rotor copper loss with rotor output is:
Q4.The rotor power output of three phase induction motor is 15 kW. What would be the rotor copper loss having a slip of 4 percent?
Q5.The rotor power output of 3-phase induction motor is 15 kW. The rotor copper losses at a slip of 4% will be -
Q6.A 3-phase, induction motor operating at a slip of 5% develops 20 kW rotor power output. What is the corresponding rotor copper loss in this operating condition?

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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