In the question number 61, the heat exchanged by the engine with thesurrounding for path D to A is (at constant pressure)

In the question number 61, the heat exchanged by the engine with thesu

1.	In the question number 61, the heat exchanged by the engine with thesurrounding for path D to A is (at constant pressure)
Answer» `(5)/(2)P_(A)(V_(D)-V_(A))` `(5)/(2)P_(A)(V_(A)-V_(D))` `(3)/(2)P_(A)(V_(D)-V_(A))` `(1)/(2)P_(A)(V_(D)-V_(A))` SOLUTION :Since DA involves compression of gas from `V_(D)` to`V_(A)` at CONSTANT pressure `P_(a)` .The WORK will be done on gas `Q_(DA)=U_(DA)+W_(DA)` `=(3)/(2)(P_(A)V_(A)-P_(D)V_(D))+P_(A)(V_(A)-V_(D))` `=(3)/(2)P_(A)(V_(A)-V_(D))+P_(A)(V_(A)-V_(D))` `=(-5)/(2)P_(A)(V_(D)-V_(A))=(5)/(2)P_(A)(V_(A)-V_(D))`