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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

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

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  less heating of the rotor.
  all of these.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 more.
 same.
 less than 50%.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 They are not hard as copper brush
All of these
 They are self lubricating in nature
 In case of any sparking they will be less damaged than copper brushes

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

None of these
 rotates same direction
 rotates opposite direction
 stationary

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
 1.
  slip X 50 / 3.
  slip X 69 / 3.

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