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A small electric clock motor is usually of the

  • A.reluctance synchronous type
  • B.capacitor start induction type with a centrifugal switch
  • C.universal type with a commutator and brushes
  • D.repulsion-start induction-run type

Answer: A

Correct answer: reluctance synchronous type

A clock needs an exact speed rather than a strong torque, and its load is minute. A small reluctance synchronous machine locks to the supply frequency and keeps time as accurately as the mains does. Any induction machine would slip, and the clock would lose time steadily.

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