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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
 speed.
  load.
  speed and voltage.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 none of above
 armature circuit

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  skewing.
  cogging.
  crawling.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Double cage motor.
  Slip ring IM.
  Squirrel cage IM.
  Synchronous motor.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 50 MW generator in a power plant.
  Hermetically sealed motor of refrigerator.
 Fractional horse power high speed motor.
 Fractional horse power slow speed motor.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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