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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
  DOL.
None of these

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 reduce eddy current loss
 collecting of voltage
 convert ac armature current in to dc

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 V²
 f
 f²

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
 2000 Volt.
 1600 Volt.
  0 Volt.

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

  15 %.
 10 %.
  20 %.
  2.5 %.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)
 Vt = Ea + Iara+ ILrs

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