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Electrical Machines

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

 10 %.
  15 %.
  2.5 %.
  20 %.

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

 Cast iron.
  Fibre.
 Mild steel.
 Silicon steel.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 reduce by 5 %.
 increase by 5 %.
 depend on other factors.
 remain unchanged.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 100 V.
  230.2 V.
 50 V.
 399 V.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  facilitate cooling of rotor.
  eliminate noise.
  none of these.

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MORE MCQ ON Electrical Machines

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