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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1/(1-S)
 1-S

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  crawling.
  air gap.
  cogging.

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 increasing efficiency.
 mechanical balancing.
All of these

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Cast iron.
 Silicon steel.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
 0.25Ω.
 0.5Ω.
  0.23Ω.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 V
 f
 f²

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