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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 3Fmax.
 (1/2)Fmax.
  (3/2)Fmax.

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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

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

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Bush bearings.
  Cast iron bearings.
  Ball bearings.
None of these

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Electrical Machines
Stray losses in transformer occurs in

 steel core.
  winding conductors and steel structures of transformer.
 transformer insulating oil.
 paper insulation in transformers.

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Electrical Machines
The slip of an induction motor normally does not depend on

  synchronous speed.
  shaft torque.
  rotor speed.
  core loss component.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Starting torque.
 Running Torque.
 Speed regulation.

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