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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 36 W.
 25 W.
 28 W.

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

 Cast iron.
 Silicon steel.
 Mild steel.
  Fibre.

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Electrical Machines
Commonly used starters of cage motor is

  star delta.
  DOL.
None of these
  both A and B.

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
  silicon steel.
 cast steel.
 wrought iron.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Mechanical power.
 Induced emf.
 Can not be determined.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²
 PZL/4Sa²

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