Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 field winding must be excited by low voltage dc supply
 the armature connection must be reversed
 the field winding connection must be reversed
 the field winding must be replaced

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

 armature resistance, effect of armature reaction.
  armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
  reduction in field current, effect of armature reaction, armature.

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Electrical Machines
In case of 3 - Φ IM, plugging means

  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.
  locking of rotor due to harmonics.
  pulling the motor directly on line without a rotor.

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