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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
 700 W
 650 W
 600 W

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Electrical Machines
In DC machine yoke offers

 produce working flux
 both A and B
 flux path completion
 mechanical protection to the machine

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will becomes four times.
  It will be halved.
  It will be doubled.
 It will remain the same.

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

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

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the motor may run away.
 the starting torque becomes low.
 the motor may not start.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  375 to 500.
  500 to 720.
  720 to 920.

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MORE MCQ ON Electrical Machines

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