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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2HZ
 2.5Hz
 1 Hz

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
  if it has lost residual magnetism.
 due to wrong direction of rotation.
 any one of above.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 not possible
 230 V
 some what less than 230 V

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Stator resistance starting.
  Direct online starting.
  Rotor resistance starting.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral plane.
  Magnetic neutral pole.
  Magnetic neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
  increase the speed of shaft rotation.
 increase the number of turns in field coil.
 increase the number of turns in armature coil.

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