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GATE 2023 Electrical Machines Quiz 33

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Question 1

The power input to a 3-phase induction motor is 60 kW. Total stator losses are 1000 W, the % efficiency of the motor if it is running at a slip of 4% is. (Assume negligible mechanical losses)

Question 2Multiple Correct Options

Skewing of rotor in a 3-ϕ squirrel cage IM reduces-

Question 3

What is the ratio of mechanical power developed to rotor copper loss in the rotor of three phase induction motor?

Question 4

A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 200 Nm at a rotor frequency of 2 Hz, the shaft power will be ______ kW.

Question 5

A 4 pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 200 Nm when the rotor emf make 180 cycles per minute. Calculate the cupper loss in rotor winding. (Mechanical losses = 2 kW)

Question 6

A 3-phase induction motor draws 1000 kVA at a PF of 0.8 lag. A synchronous condenser is connected in parallel to draw an additional 8000 kVA at p.f. of 0.6 lead. The power factor of the total supply by the mains is:
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Sep 28ESE & GATE EE