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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  aluminium.
  stainless steel.

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 90°.
 30°.
 60°.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Ampere law.
 Fleming's right hand rule.
 Lenz's law.
 Fleming's left hand rule.

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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.
 zero.
  unity.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 18°
 36°
 30°

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Electrical Machines
The armature shaft must be able to with stand

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

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