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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

 Blv.
 Bl2v2.
 Bl2v.
 Blv2.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Lathes.
  All of this.
 Blowers and fans.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  3 Hz.
 10 Hz.
  2 Hz.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  relative speed.
  cogging.
  air gap.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 draw a starting current many times its rated full load current.
 damage the armature and commutator.
 all of above.
 provide execessive voltage drop in line.

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
 Xd < Xq.
 Xd > Xq.
None of these

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MORE MCQ ON Electrical Machines

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