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Consider a cycle followed by an engine (...

Consider a cycle followed by an engine (figure.)

1 or 2 is isothermal
2 to 3 is adiabatic
3 to 1 is adiabatic
Such a process does not exist, because

A

heart is completely converted to mechanical energy in such a process, which is not possible

B

mechanical energy is completely converted to heart in this process, which is not possible

C

curves representing two adiabatic processes don't intersect

D

curves representing an adiabatic process and an isothermal process don't intersect

Text Solution

Verified by Experts

The correct Answer is:
A, C
(a) The given process in a cyclic process i.e., it returns to the orignal state 1.
Hence, change in internal energy dU = 0
`rArr" "dQ=dU+dW=0+dW=dW`
Hence, total heat supplied is converted to work done by the gas (mechanical energy) which is not possible by second law of thermodynamics.
(c ) When the gas expands adiabatically form 2 to 3. It is not possible to return to the same state without being heat supplied, hence the process 3 to 1 cannot be adiabatic.
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