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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Field.
 Coupling mounted on the shaft.
 Armature.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  all of above.
 size of air gap.
  clearance between tips of the adjacent pole shoes.
  shape of the pole shoe.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thick
 large and thin
 less and thin

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 ball bearings → small machines
 roller bearings → large machines
 both A and B

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

 rheostatic control.
 none of above.
 any of above method.
 Ward Leonard control.

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Electrical Machines
Slip exists in

  none of above.
  synchronous motor.
  induction motor.
  in both machines.

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