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Electrical Machines

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

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

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Fibre.
 Silicon steel.
 Mild steel.

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Electrical Machines
Breadth factor is defined as the ratio of

 both 1 and 2.
 emf with distributed winding to emf with concentrated winding.
None of these
 emf with concentrated winding to emf with distributed winding.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
 Armature.
 Brush.
  Commutator.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Reversing supply connection.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use of compensating winding.
 the use drum winding.

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