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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
Which of the following is the largest conversion device?

 DC machine
 Induction machine
 Synchronous machine
All of these

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve voltage level.
  Improve power factor.
  Improve power level.
  Improve current level.

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.54 Ω.
 0.01 Ω.
 0.06 Ω.
  0.54 Ω.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a induction machine.
 stator of a dc machine.
 rotor of a dc machine.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V
 T∝ V²

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