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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 200 V.
 115 V.
 460 V.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.96
 0.87
 0.95

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 0 < S < 1
 -2 < S < 2
 0 < S < 2

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Electrical Machines
Armature reaction in DC generators will result in

 open circuit.
 short circuit.
 reduction in generated emf.
 increase in slip.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  DC supply.
  equalizing coils.
  external star-connected resistors.
  3 - Φ AC supply.

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

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

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