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JEE Main 2020 (8 Jan, Shift 1) · P-V Diagrams & Cyclic Processes

P-V Diagrams & Cyclic Processes question from JEE Main 2020 (8 Jan, Shift 1)

Q59JEE Main 2020 · 8 JAN · SHIFT 1Difficult

P-V Diagrams & Cyclic Processes

A thermodynamic cycle xyzx is shown on a V-T diagram.

The P-V diagram that best describes this cycle is:

(Diagrams are schematic and not to scale)

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Answer: (a)

$x \to y$ : straight line through the origin on $V$ - $T$ , so $V \propto T$ : isobaric expansion.
$y \to z$ : $V$ constant, $T$ falls: isochoric, so $P$ decreases.
$z \to x$ : $T$ constant, $V$ falls: isothermal compression, $P$ rises along a hyperbola.
On $P$ - $V$ : horizontal line $x \to y$ , vertical drop $y \to z$ , isothermal curve $z \to x$ . So the answer is (a).

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