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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 600 W
 700 W
 650 W

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 Increases cost.
 makes the material brittle.
 increases hysteresis loss.
All of these

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 R1 /K²
 R1 /K
 K×R1

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 Good voltage regulation
 Low short circuit current
None of these
 High voltage regulation

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically and statically induced emf.
 dynamically induced emf.
None of these

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

  16.67%.
 14.28%.
 18.25%.
 15.30%.

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