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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 Cos α
 sin (α/2)
 Cos (α/2)

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  repulsion motor type starting.
  transformer with short-circuited secondary.
  synchronous motor.

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 increasing magnetic flux.
 alternating electric flux.
 constant magnetic flux.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 4KVA
 16KVA
 20KVA

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thinner.
  thicker.
  sipper.
  rotor can not have any laminations.

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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

 96 V
 384 V
 768 V
 192 V

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