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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  over excitation.
  heating.
  vibrations.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 3000 rpm
 1500 rpm
 1000 rpm
 4000 rpm

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 variable loss
 constant loss

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

 2 and 2
 2 and 1
 4 and 2
 4 ang 1

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 improve the starting torque.
 improve the power factor.
 start the motor.

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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

 0.01 Ω.
  0.54 Ω.
 0.54 Ω.
 0.06 Ω.

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