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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Star - star
 Delta - delta
 Delta - star

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 0 KVA
 6 KVA
 10 KVA

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  as wide as possible.
  air gap does not matter.
  depends on the material of stator and the rotor.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 increasing the number of turns.
 using soft material for winding.

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Electrical Machines
Breather is provided in a transformer to

 filter the transformer oil.
 absorb moisture from air entering in transformer.
 provide cold air in transformer.
  absorb moisture of air during breathing.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 192 V
 96 V
 768 V

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