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N R Verma Verma

· started a discussion

· 1 Months ago

wrong (Question: 332629.0 )

Actually the efficiency of carnot engine is increased by decreasing the lower temp not increasing higher temperature.

Question:

The more effective way of increasing efficiency of Carnot engine is to 

Options:
A)

increase higher temperature  

B)

decrease higher temperature  

C)

increase lower temperature  

D)

decrease lower temperature  

  

Solution:

Ans:(A)

 

Knowledge Expert

· commented

· 1 Months ago

Dear student,

If you know efficiency to be n

n for a carnot cycle = 1 - TL/TH

If you increase TL you will have a lower efficiency and if you increase TH you will have a higher efficiency. You want you TL/TH term to go to zero so efficiency can be equal to one.
This is simple math. If you increase your TH by some factor x you will have a more efficient cycle than if you decrease your TL by that same factor x. So the better choice would be to increase TH while keeping TL constant.
There are always limits. TL can never go below 0 degrees K and because of the available materials we use for engineering purposes TH can only be so hot so Limits would exist in both cases

Best wishes
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