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SSC JE 2017: Electrical Machines Rankers Quiz 2

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Question 1

A Single Phase Transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is

Question 2

The following motor definitely has a permanent magnet rotor

Question 3

In the protection of transformers, harmonic restraint is used to guard against

Question 4

What is the frequency of rotor current of a 50 Hz induction motor operating at 2% slip?

Question 5

Distributed winding and short chording employed in AC machines will result in

Question 6

For a 1.8o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is

Question 7

Which of the points on the torque-speed curve of the induction motor represents operation at a slip greater than 1?

Question 8

Which of the following parameters in an induction motor influences the magnetizing reactance to the maximum extent?
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Sep 8ESE & GATE EE