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Electrical Machines

Electrical Machines
Compensating winding is placed in the

 armature core
 pole shoe
 main field
All of these

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = 1.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 permanent magnet motor
 differentially compounded motor
 comulatively compounded motor
 series motor

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Hydro alternators.
 Turbo alternators.
 Aame in both alternators.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  equalizer rings.
 graphite brushes.
  commutator with large number of segments.
  carbon brushes.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Amperes law.
 Newtons law.
 Coulombs law.

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