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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  star delta.
  both A and B.
  DOL.
None of these

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 Induction motor.
 DC compound.
  DC series.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 rotor resistance
 supply frequency

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 pole chamfering
 compensating winding
 pole stacking

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Glass.
  Oil impregnated paper.
  Vacuum.
  Mica.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Open fuse or circuit breaker.
 Draw too much current.
  Develop excessive speed and damage itself.

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