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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less maintenance.
  all of below.
  simple in construction.
  less cost.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these

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

  P.
  Z.
  none of these.
  P and Z.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  None of these.
  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.

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