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Electrical Machines

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.
 Bl2v2.
 Blv.
 Bl2v.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Ampere law.
 Fleming's right hand rule.
 Fleming's left hand rule.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmax to Imin.
 Vmin to Imax.
 Vmax to Imax.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 reactance voltage produced due to communication.
 the use of compensating winding.
 the use drum winding.
  the use equalizer in lap winding.

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
  f.
 f3.
 f2.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 reduced starting current.
 smoother acceleration.
 more starting torque.

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