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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  mild steel.
  cast iron.
  aluminium.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 none of above
 armature circuit
 shunt field

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and indirect axis
 quadrature axis and interpolar axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be less than 10%
 be 12.5%
 remain unchanged

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Electrical Machines
Stray losses in transformer occurs in

 transformer insulating oil.
 paper insulation in transformers.
  winding conductors and steel structures of transformer.
 steel core.

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Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  none of these.
  EbIa2.

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