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Electrical Machines

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

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

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Armature voltage control.
 Any of above.
 Shunt field resistance control.

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Electrical Machines
In most condition which frame of motor will be preferred?

 Splash proof.
  Totally enclosed fan coiled.
 Open type.
 Drip proof.

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Ns = 120f / p × ( 1 - s ).
  Nr = 120f / p × (1-s).
  Ns = 120f /p × ( 1 - r).

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  induction generator torque.
  DC motor torque.
  induction motor torque.

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC shunt generator.
 DC series generator.
 None of these.

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