IIT JAM Follow
May 15, 2020 10:22 pm 30 pts
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• Ruby negi
A to B is isothermal process(dT=0) so temperature is same.. B to C is isobaric process for dQ=nCpdT and C to A is isochroic process so dQ=nCvdT(dW=0)...
hope all steps are clear to you.. for any doubt please ask..
• Deepanshu Chaudhary
Im not getting that how the ratio W/Q can be found?
Abhishek singh
wait a minute. I will give you exact method to do this question without Cv and Cp.
• Dhairya sharma
in these type of question arrows should be given.
Deepanshu Chaudhary
Now how is efficiency greater than 1?
• Dhairya sharma
is it clear dear ?
• Dhairya sharma
dear bcoz it's reversible process and chnz in internal energy is o so work done will equal to heat absorbed. so efficiency of ideal reversible heat engine is one.
Deepanshu Chaudhary
But the place where I saw this question, 1 was not in the option. The options were like 1/3, 1/6 , etc. I don't have the question right now.. I guess the engine is not reversible
• Dhairya sharma
like this. see the attached you will get it.
Deepanshu Chaudhary
what about heat mam? how can we get it from diagram?
• Dhairya sharma
for any process we have to calculate work done in any process. in your diagram we can calculate work done from area under the curve. that area will give us work done hence we will ...
• Abhishek singh
you can calculate the work done by area under the curve (area of triangle is 1/2* base * height.) and the heat intake can be calculated in isobaric and isochoric process. devide th...
Deepanshu Chaudhary
heat will be CvdT and CpdT. But we have not been given the atomicity of the gas used. so how can we calculate it?
• Dhairya sharma
carnot engine is reversible heat engine. we can calculate its efficiency . see the attached