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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
None of these
 throughout the air gap.
  region under main pole.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 rough commutator surface.
 imperfect contact.
 severe sparking.
 any of above.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 generation of voltage
 commutation
 electromechanical energy conversion
 development of torque

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  get over heated.
  make noise.
  not run.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Power drawn in KVA.
  Output power at the shaft.
 Gross power.

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MORE MCQ ON Electrical Machines

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