Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  damper bar develops torque.
  harmonic are developed in the armature circuit.
  negative phase sequence currents are generated.

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 The accuracy in speed control is required.
 All of above.
 Very fine speed control over the whole range from zero to normal speed is required.
 The speed in both the direction is required.

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

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

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