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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  none of these.
  P.
  Z.

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

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

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
 two.
  unity.
 zero.

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Electrical Machines
A DC series motor must started on no load because it would

 Not develop starting torque.
  Run at dangerously high speed.
 Draw more current without producing sufficient torque.
 Fail to start without load.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  locking tendency is reduced.
  uniform torque.
  all of below.

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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