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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 cast iron.
 silicon steel.
 fibre.

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 DOL starter.
 Auto transformer starter.
 Star-delta starter.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a finite negative value
 ∞
 a positive finite value
 0

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 Compounded DC generator.
 DC series generator.
 DC shunt generator.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 transformer insulating oil.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
 10 %.
  2.5 %.
  15 %.

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