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Electrical Machines

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

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

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 DC Series Motor
 Compound Wound DC Motor
 Separately Excited DC Motor

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.
  heavy short-circuited end rings.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 230 V
 65 V
 115 V

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Increase speed
 Reduce starting torque.
 Reduce armature heating.
 Increase acceleration duration.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  both of the above.
  hysteresis loss.
  eddy current loss.
  weight of the stator.

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MORE MCQ ON Electrical Machines

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