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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 increase.
 decrease.
 remain constant.
 any of the above.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the series field
 in parallel with the shunt field
 in series with the series field

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
 1 - s.
  s.
 2 + s.

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Electrical Machines
Stray losses in transformer occurs in

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

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 Both Synchronous and Induction motor
 DC Shunt Motor
 Induction motors

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