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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  rotor shaft.
  pole faces.
  stator frame.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  three phase winding.
  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.

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Electrical Machines
Synchronous reactance of an alternator represents

 field winding reactance
 armature reactance and leakage reactance
 a reactance operating at synchronous speed
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 = N1 / N2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = 1.

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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 less than 10%
 be 12.5%
 be more than 10%

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

None of these
 exactly opposite
 same
 either of these

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MORE MCQ ON Electrical Machines

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