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Electrical Machines

Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 399 V.
 50 V.
 100 V.

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Electrical Machines
The stator frame in an induction motor is used to

  hold armature stamping in position.
  ventilate the armature.
  protect the whole machine.
  provide return path for the flux.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous motor.
  induction generator.
 synchronous generator.
 induction motor.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 damping winding.
 tertiary winding.
 compensating winding.

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

 Silicon steel.
  Fibre.
 Cast iron.
 Mild steel.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.4.
  1.2.
 1.8.
 1.5.

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