Convert a reading of 18 in Hg vacuum to psia.

Convert a reading of 18 in Hg vacuum to psia.
 
  A) 18 in Hg/2 = 9 psia (rounded)
  B) 30 + 18 in Hg vacuum = 48 in Hg absolute (rounded)48 in Hg absolute/2 = 24 psia (rounded)
  C) 30  18 in Hg vacuum = 12 in Hg absolute (rounded)12 in Hg absolute/2 = 6 psia (rounded)
  D) 18 in Hg + 30 = 48 psia (rounded)

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[Ques. 2] What would a barometric pressure reading of 28 in Hg be in psia?
 
  A) A 28 in Hg barometric reading is equivalent to 28 psia.
  B) 28 in Hg/2 = 14 psia (rounded)
  C) 28 in Hg + 15 = 43 psia (rounded)
  D) 28 in Hg - 15 = 13 psia (rounded)

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[Ques. 3] Convert 55 psig to absolute pressure.
 
  A) 55 psig + 15 = 70 psia (rounded) B) 55 psig + 30 = 85 psia (rounded)
  C) 55 psig - 15 = 40 psia (rounded) D) 55 psig - 30 = 25 psia (rounded)

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[Ques. 4] What is the conversion of 20 inches of mercury to psi?
 
  A) 60 psi B) 40 psi C) 2 psi D) 10 psi

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[Ques. 5] Vacuum is often measured in:
 
  A) Pounds of vacuum. B) Kilopascals.
  C) Inches of alcohol. D) Inches of mercury.