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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
 1.0.
  1.5 to 2.
 2 to 3.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and interpolar axis
 quadrature axis and direct axis

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
 Series.
 Cummulative compound.
  Shunt.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It runs at very high speed at light load.
 It is cheaper in cost.
 It consume less power.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the armature current.
 Increasing the field current.
 Decreasing the field current.
 Increasing the field current.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f2
 V2
 f

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MORE MCQ ON Electrical Machines

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