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Pressure casting at 1.2 megapascals against atmospheric suction of about 0.1 megapascals gives roughly what increase in driving pressure?

  • A.about twelve times
  • B.about ten times
  • C.about two times
  • D.about a hundred times

Answer: A

Twelve tenths divided by one tenth is twelve, so the driving force is roughly twelve times greater. Since casting rate depends on that pressure, the cycle time falls dramatically. Cycles measured in hours become cycles measured in minutes.

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