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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  low.
  high.
  medium.

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

 10 %.
  15 %.
  2.5 %.
  20 %.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
  Effiency.
 Speed regulation.
 Starting torque.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 Increases cost.
 makes the material brittle.
All of these

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Electrical Machines
A single-winding single-phase motor has

 high starting torque.
 low starting torque.
 starting torque equal to full-load torque.
  zero starting torque.

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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

 384 V
 192 V
 768 V
 96 V

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