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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 150Hz.
 200Hz.
 100Hz.

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
  absorb moisture of air during breathing.
 filter the transformer oil.
 absorb moisture from air entering in transformer.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 1920W
 2000W
 1450W

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

  Paraffin based insulating oil.
 Aromatics based insulating oil.
 Olefin based insulating oil.
 Naphtha based insulating oil.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/60.
 PN/120.
 PN/3000.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 shaded, shaded
 shaded, unshaded
 unshaded, unshaded

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