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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  1.0.
  0.05.
  0.1.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Ampere law.
 Fleming's right hand rule.
 Lenz's law.
 Fleming's left hand rule.

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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

  1.
 0.4.
 0.8.
 0.6.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Hysteresis loss
 Eddy current loss
 Copper loss

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the chance of crawling.
 reduce the chance of cogging.
 reduce the magnetizing current.

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MORE MCQ ON Electrical Machines

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