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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  heating.
  over excitation.
  any of these.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Inversely proportional to armature current.
  Constant.
 Proportional to armature current.
 Proportional to the square of armature current.

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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 )

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

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 more than 6 V
 zero
 6 V

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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
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of supply frequency.
  Change of supply voltage.
  Change of number of pole.

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