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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 27°C.
  45°C.
 32°C.
 35°C.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  along neutral axis.
  in none of above positions.
  along field axis.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 0.08
 -1.92
 1.92

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 100 Hz.
 Zero Hz.
 50 Hz.
 25 Hz.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  2 - 3 µF.
 5 - 10 F.
 0.1 µF.
  1 - 2 µF.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 0.25.
 Greater than 1.
 near to 1.

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MORE MCQ ON Electrical Machines

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