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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 3000 rpm
 1000 rpm
 750 rpm

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Electrical Machines
The torque developed in IM is nearly proportional to

  1 / V.
  V2.
 1 / V2.
  V.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 more than 220 V
 220 V
 somewhat less than 220 V

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
  zero.
 positive.
 negative.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
  222 V.
 230 V.
 225 V.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.8.
 0.6.
  1.

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