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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
  Effiency.
 Starting torque.
 Speed regulation.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  provide starting torque only.
  reduce noise level only.
  reduce the eddy currents.
  prevent hunting and provide the starting torque.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be 12.5%
 be more than 10%
 be less than 10%

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 flux path completion
 produce working flux
 both A and B

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

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

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Electrical Machines
Slip test is performed to determine

All of these
 positive sequence reactance and negative sequence reactance
 slip
 direct axis reactance and quadrature axis reactance

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MORE MCQ ON Electrical Machines

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