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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  1/Ia.
  √Ia.
  Ia.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2Kf2Bm.
 KefKf2Bm2.
 Kef2KfBm2.
  Kef2Kf2Bm2.

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Electrical Machines
Ward Leonard control is provides speed control

  Above rated speed.
  In one direction only.
  Below rated speed.
  In both direction.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque and high power factor.
  none.
  high staring torque only.
  high power factor only.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  shunt.
  differential compounded.
  under-compounded.

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
  absorb moisture of air during breathing.
 filter the transformer oil.
 absorb moisture from air entering in transformer.

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