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Electrical Machines

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

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

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  coil resistance.
 armature emf.
  reactance voltage induced in the coil.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 8 KW.
 0.
 10 KW.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
All of these
 Bending moment due to weight of the armature.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 50 V.
 399 V.
 100 V.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 10 ohm
 2 ohm.
 0.2 ohm

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MORE MCQ ON Electrical Machines

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