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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  none of these.
  EbIa2.
  EIa.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 approach zero.
 remain unchanged.
 aprroach infinity.

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Electrical Machines
Synchronous reactance of an alternator represents

All of these
 armature reactance and leakage reactance
 a reactance operating at synchronous speed
 field winding reactance

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T ∝ P.
 T is independent of P.
 T2 ∝ P3.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 armature reaction.
  reactance voltage.
 presence of commutator.
 high resistance of carbon brushes.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  crawling.
  resonance.
  harmonics.
  cogging.

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