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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  13 HP.
 14 HP.
  10 HP.
 15 HP.

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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/60.
 PN/3000.
 PN/2.
 PN/120.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer voltage
 direct current
 high frequency supply
 rated transformer current

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Electrical Machines
Rotor resistance speed control is used in

 dc shunt motor.
 squirrel cage induction motor.
 slip ring induction motor.
 synchronous motor.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the armature current.
 Decreasing the field current.
 Increasing the field current.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Permanent magnets.
 Both B and C.
  Electromagnets.

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