Discussion
The air gap of a linear induction machine is usually larger than that of a rotary machine, which makes its
Answer: A
Correct answer: magnetising current larger and its power factor poorer
A linear machine must tolerate mechanical clearances along its whole length, so its gap is several millimetres rather than a fraction of one. A larger gap means a higher reluctance, so more magnetising current is needed for the same flux, and that current is almost purely reactive - hence the poor power factor characteristic of linear induction machines.
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