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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 both of above.
 AC.
 DC.

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Electrical Machines
An IM cannot run at synchronous speed because

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

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 200 V.
 400 V.
 100 V.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  crawling.
  cogging.
  resonance.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  aluminium.
  silicon steel.

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
None of these
 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.

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