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Electrical Machines

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

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 40 - 400 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  Ward Leonard control.
  Rheostatic control.
  None of above.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 √3
 1/√3
 3

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 30 W
 more than 30 W
 less than 30 W

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 mechanical rotatory system.
  restoring torque.
 synchronizing power co efficient.

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MORE MCQ ON Electrical Machines

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