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A turbine entry temperature of 1750 K is achieved with a blade alloy melting near 1600 K. The cooling must hold the metal at least

  • A.1750 K
  • B.150 K below the gas temperature
  • C.150 K above the gas temperature
  • D.At the gas temperature

Answer: B

The metal must sit below its melting point while the gas around it is hotter still, which cooling and a thermal barrier coating together achieve. Running gas hotter than the alloy melts is normal practice and depends entirely on that margin.

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