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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  8.
 6.
  2.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  parallel.
  series.
  any one of the connection.
  no resistance is connected.

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Electrical Machines
Tappings of a transformer are provided

 at the phase end of lv side
 at the middle of hv side
 at the phase end of hv side
 at the neutral side end of hv side

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Electrical Machines
Slip exists in

  none of above.
  induction motor.
  synchronous motor.
  in both machines.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Remains unchanged.
 None of above.
  Increases.
 Decreases.

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Electrical Machines
_____________ types of induction motor are widely used.

  Slip ring IM.
  Squirrel cage IM.
  Three phase IM.
  Single phase IM.

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