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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 180.
 45.
  270.

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

 50 V.
 399 V.
 100 V.
  230.2 V.

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Electrical Machines
Induction motors provided with open slots have

  more breakdown torque.
  leading power factor.
  less breakdown torque.
  higher efficiency.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 2-S
 S
 1/S

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
 inversely as 1/Xs
All of these
 directly as synchronous reactances Xs

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

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

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