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The braking magnet is moved along the radius of the disc in order to adjust

  • A.the phase of the shunt magnet flux relative to the applied voltage
  • B.the torque available at very small fractions of the rated current
  • C.the point at which the overload compensation begins to act
  • D.the full-load registration

Answer: D

Moving the magnet outward increases the radius at which the eddy currents act and so the braking torque, which slows the disc and reduces the registration. This is the coarse speed adjustment and it is made at rated current and unity power factor.

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