Posers and Puzzles

Posers and Puzzles

  1. Joined
    15 Dec '03
    Moves
    283304
    07 Mar '18 20:28
    What is the absolute pressure in a piping system when the vacuum gage reads 20" and the barometer reads 30.71" of mercury?
  2. SubscriberKewpie
    since 1-Feb-07
    Joined
    20 Jan '09
    Moves
    324807
    10 Mar '18 00:01
    Absolutely no idea. Seems there aren't any engineers reading this forum.
  3. Subscribervenda
    Dave
    S.Yorks.England
    Joined
    18 Apr '10
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    61034
    10 Mar '18 13:081 edit
    Originally posted by @kquinn909
    What is the absolute pressure in a piping system when the vacuum gage reads 20" and the barometer reads 30.71" of mercury?
    If an answer in the 20 questions quiz was "the absolute pressure in a piping system " what category would that come under?
    Presumably abstract.
    In answer to the original question, when they ask these sort of questions on university challenge the answer is usually 1, minus 1 or zero so I will say the answer is 1!
  4. Subscriberjoe shmo
    Strange Egg
    podunk, PA
    Joined
    10 Dec '06
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    7733
    10 Mar '18 20:15
    Originally posted by @kquinn909
    What is the absolute pressure in a piping system when the vacuum gage reads 20" and the barometer reads 30.71" of mercury?
    You need to state the units of pressure on the vacuum gage. If they are "inches mercury" then say that, because it isn't clear.

    if they are inches mercury then the answer is

    P_abs = 30.71" Hg - 20" Hg = 10.71" Hg
  5. Joined
    15 Dec '03
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    283304
    13 Mar '18 21:37
    Originally posted by @joe-shmo
    You need to state the units of pressure on the vacuum gage. If they are "inches mercury" then say that, because it isn't clear.

    if they are inches mercury then the answer is

    P_abs = 30.71" Hg - 20" Hg = 10.71" Hg
    Turns out trick question I think. So. What is 10.71" in PSI or PSIA?
  6. Subscriberjoe shmo
    Strange Egg
    podunk, PA
    Joined
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    7733
    14 Mar '18 01:36
    Originally posted by @kquinn909
    Turns out trick question I think. So. What is 10.71" in PSI or PSIA?
    About 5.2 psi

    It's not a trick question, just worded with imprecise language.
  7. Joined
    15 Dec '03
    Moves
    283304
    14 Mar '18 05:47
    Originally posted by @joe-shmo
    About 5.2 psi

    It's not a trick question, just worded with imprecise language.
    I got 5.3 - .79.
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