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## haridas_mandal 2 years 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

Where is the 'given' P-V diagram?

2. haridas_mandal

|dw:1359433955167:dw|

3. haridas_mandal

The P-V diagram

4. aish_premrenu

What's the question? cyclic process equivalent to? any equation given?

5. haridas_mandal

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

|dw:1359435181308:dw|

7. Mashy

ok lets do this section by section.. in your original graph.. section A to B.. what kind of process is it??

8. haridas_mandal

It is const pr i.e isobaric one.

9. Mashy

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

10. haridas_mandal

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

11. Mashy

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

12. Mashy

which options can you eliminate ??

13. haridas_mandal

right extreme which is no 2 in this question.

14. Mashy

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

15. haridas_mandal

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

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

why A? Pr as shown is constant here.

18. haridas_mandal

It was my fault not to show it correctly. Line a-b at A is parallel.

19. Mashy

ohhww.. ok ok :).. fine.. so then lets continue with section BC.. what do you think happens?

20. haridas_mandal

It is either isothermal or adiabatic

21. Mashy

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

It is ischoric , volume is const.

23. Mashy

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

24. haridas_mandal

D

25. Mashy

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

Problem is the correct option given is as B that is the right upper most. and not been explained. Pl help.

27. Mashy

since its reversible maybe .. the direction doesn't matter.. !!!

28. Mashy

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

can't draw :P.. http://physics.info/pressure-volume/ check this.. !!

30. haridas_mandal

Ok thanks I shall come back.

31. Mashy

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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