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A linear synchronous machine is used in a maglev vehicle because it

  • A.develops thrust only when the vehicle is stationary
  • B.gives thrust with no contact between vehicle and track
  • C.requires a much smaller air gap than an induction machine
  • D.needs no converter to control the vehicle's speed

Answer: B

Correct answer: gives thrust with no contact between vehicle and track

A linear synchronous machine produces thrust across the gap by magnetic action alone, so there is no wheel, no rail contact and no adhesion limit. This is what allows very high speeds, and it fits naturally with the magnetic suspension that holds the vehicle off the track in the first place.

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