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A synchronous motor pulling into step from induction running does so most readily when

  • A.the field is applied at the moment of switching on
  • B.the field winding is left open circuited throughout
  • C.the load inertia is small and the slip already low
  • D.the load inertia is very large and the slip still high

Answer: C

The rotor has to be accelerated the last fraction of a per cent by the synchronising torque alone, and a heavy inertia may swing past and fail to lock. Applying the field at a favourable rotor position makes the transition gentler.

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