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The end effect in a linear induction machine arises because

  • A.the machine has no end rings to complete the rotor circuit
  • B.the supply frequency is too high for a linear geometry
  • C.the air gap of such a machine is very much smaller than is usual elsewhere
  • D.the reaction plate continually enters and leaves the field region

Answer: D

Flux has to be established in each new piece of plate as it enters and dies away as it leaves, which costs efficiency and distorts the thrust. It has no counterpart in a rotary machine, whose rotor never leaves the field.

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