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Electrical Machines

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

 MNA
 GNA
None of these
 either GNA or MNA

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Single phase induction motor.
  AC slip ring motor.
  Synchronous motor.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 armature.
 none of these.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
  Full load current.
 None of these.
 Full load torque.

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

  230.2 V.
 50 V.
 100 V.
 399 V.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 96 V
 384 V
 192 V
 768 V

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