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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Blv2.
 Bl2v.
 Blv.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  both of the above.
  weight of the stator.
  hysteresis loss.
  eddy current loss.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 4 ang 1
 4 and 2
 2 and 1

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Field current.
 None of above.
 Armature current.
 Line current.

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Electrical Machines
An IM cannot run at synchronous speed because

  rotor torque will not be produced.
  induction motor will become synchronous motor.
  none of above.
  air friction will prevent it.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 1000 rpm
 750 rpm
 1500 rpm

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