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Electrical Machines

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

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

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Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Conservator tank.
 Tap changer.
 Radiator.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  1 - 2 µF.
  2 - 3 µF.
 5 - 10 F.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 4 and 2
 2 and 1
 4 ang 1

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  voltage.
  speed and voltage.
 speed.

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

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

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