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haridas_mandal

An ideal gas is subjected to a cyclic process ABCD as depicted in the P-V diagram given. Which of the following curves represents the equivalent cyclic process?

  • one year ago
  • one year ago

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  1. aish_premrenu
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    Where is the 'given' P-V diagram?

    • one year ago
  2. haridas_mandal
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    |dw:1359433955167:dw|

    • one year ago
  3. haridas_mandal
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    The P-V diagram

    • one year ago
  4. aish_premrenu
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    What's the question? cyclic process equivalent to? any equation given?

    • one year ago
  5. haridas_mandal
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    The diagram is on the extreme left is the PV Diagram and the all the 4 options given on P-T diagram. My fault , I do not know how to amend the sketch as there is no eraser facility..One of the 4 options is right.

    • one year ago
  6. haridas_mandal
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    |dw:1359435181308:dw|

    • one year ago
  7. Mashy
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    ok lets do this section by section.. in your original graph.. section A to B.. what kind of process is it??

    • one year ago
  8. haridas_mandal
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    It is const pr i.e isobaric one.

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  9. Mashy
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    ok.. so you see that volume is expanding keeping pressure constant... now tell me during this process what happens to temperature?

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  10. haridas_mandal
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    PV=nRT v is directly proportional to T hence it creases.

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  11. Mashy
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    correct.. so now.. match the options.. for AB section!!

    • one year ago
  12. Mashy
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    which options can you eliminate ??

    • one year ago
  13. haridas_mandal
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    right extreme which is no 2 in this question.

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  14. Mashy
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    |dw:1359878043806:dw| NOW TELL WHICH OPTION can you eliminate?

    • one year ago
  15. haridas_mandal
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    first column second row as it shows pr not constant. and as i have said right top most as the arrow is shown from B to A.( though I am not sure of that)

    • one year ago
  16. Mashy
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    the arrow has to be opposite.. now i have marked 4 options dude.. i have called it A B C D.. :P.. so you are saying you can eliminate option C right??.. you are correct .. cause pressure is increasing in that you can also eliminate option A.. so its between option B and D..

    • one year ago
  17. haridas_mandal
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    why A? Pr as shown is constant here.

    • one year ago
  18. haridas_mandal
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    It was my fault not to show it correctly. Line a-b at A is parallel.

    • one year ago
  19. Mashy
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    ohhww.. ok ok :).. fine.. so then lets continue with section BC.. what do you think happens?

    • one year ago
  20. haridas_mandal
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    It is either isothermal or adiabatic

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  21. Mashy
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    yea well.. its very difficult to make out if its an isothermal or adiabatic!! :-/.. lets skip that.. and go to C-D process!!

    • one year ago
  22. haridas_mandal
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    It is ischoric , volume is const.

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  23. Mashy
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    correct.. and pressure is decreasing.. so temperature should be decreasing.. time to eliminate one more option.. which one?

    • one year ago
  24. haridas_mandal
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    D

    • one year ago
  25. Mashy
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    correct.. so now it boils down to whether the BC and DA processes are adiabatic or isothermal.. thats where i really dunno how to find out.. :-/.. but in your option B.. the order is opposite.. so if the directions are like that.. then option B can be eliminated right?

    • one year ago
  26. haridas_mandal
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    Problem is the correct option given is as B that is the right upper most. and not been explained. Pl help.

    • one year ago
  27. Mashy
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    since its reversible maybe .. the direction doesn't matter.. !!!

    • one year ago
  28. Mashy
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    you have to look at the curve in AB section.. if the curve is STEEEP .. its an adiabatic.. if the curve is not all that steep.. then its isothermal

    • one year ago
  29. Mashy
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    can't draw :P.. http://physics.info/pressure-volume/ check this.. !!

    • one year ago
  30. haridas_mandal
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    Ok thanks I shall come back.

    • one year ago
  31. Mashy
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    i need to go now.. sorry :(... but ll reply once i am back.. if no one else clears your doubt that is!!

    • one year ago
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