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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
 1.1.
  0.05.
  0.905.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 1, 3, 5
 2, 3, 4
 1, 2, 3, 4

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
  hum.
 boo.
 zoom.

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Electrical Machines
Lamination of core are generally made of

 cast iron.
 carbon.
 silicon steel.
 stainless steel.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
 0.7.
  1.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 3000W
 500W
 1000W

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