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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 100
 10

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
  None of these.
  Can't be determined.
 20 N.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
 Full load torque.
 Full load speed.
  Full load current.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be halved.
 It will remain the same.
  It will be doubled.
  It will becomes four times.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  By varying number of poles.
  Both (A) and (B).
  By varying the supply frequency.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  reduce noise level only.

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