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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  flat topped.
 triangular.
  pulsating.
  sinusoidal.

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

 T ∝ 1/V
 T ∝ 1/V²
 T∝ V²
 T ∝ V

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  permanent magnets.
 armature reaction.
None of these
  residual magnetism.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Blv.
 Bl2v2.
 Bl2v.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Shaded pole.
  Split phase.
  Capacitor run.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

  150.
 170.
 180.
 160.

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