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haridas_mandal

  • one year ago

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?

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  1. aish_premrenu
    • one year ago
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    Where is the 'given' P-V diagram?

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

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

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

  5. haridas_mandal
    • one year ago
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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.

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

  7. Mashy
    • one year ago
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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??

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

  9. Mashy
    • one year ago
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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?

  10. haridas_mandal
    • one year ago
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    PV=nRT v is directly proportional to T hence it creases.

  11. Mashy
    • one year ago
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    correct.. so now.. match the options.. for AB section!!

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

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

  14. Mashy
    • one year ago
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    |dw:1359878043806:dw| NOW TELL WHICH OPTION can you eliminate?

  15. haridas_mandal
    • one year ago
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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)

  16. Mashy
    • one year ago
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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..

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

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

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

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

  21. Mashy
    • one year ago
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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!!

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

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

  24. haridas_mandal
    • one year ago
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    D

  25. Mashy
    • one year ago
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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?

  26. haridas_mandal
    • one year ago
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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.

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

  28. Mashy
    • one year ago
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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

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

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

  31. Mashy
    • one year ago
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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!!

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