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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 both of above.
 DC.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only armature terminals are reversed.
  only field terminals are changed.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 ineffective.
 magnetizing.
 cross – magnetizing.
  demagnetizing.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic field neutral pole.
  Magnetic neutral pole.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing terminal voltage.
  increasing input power of the prime mover.
 increasing armature cooling.
  increasing armature resistance.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
  slip X 69 / 3.
  slip X 59 / 3.
 1.

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