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Hydrogen is used to cool a large turbo-alternator because it has

  • A.a low density and a high thermal conductivity
  • B.a high density and a low thermal conductivity
  • C.no tendency to leak from the machine casing
  • D.no capacity to carry away heat at all

Answer: A

Low density cuts the windage loss sharply and high conductivity carries the heat away better than air, which together allow a much larger output from the same frame. Sealing the casing and excluding oxygen are the price of using it.

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