The first operation involved in a carnot cycle is | PGMN Solutions

The first operation involved in a carnot cycle is
(A) isothermal expansion
(B) adiabatic expansion
(C) isothermal compression
(D) adiabatic compression



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🚀 Step-by-Step Solution to Solve This Question 🚀
📌 Chapter: Thermodynamics
📌 Topic: Carnot Cycle

🔹 Step 1:
The Carnot cycle is a theoretical thermodynamic cycle that provides the maximum possible efficiency between two temperatures. It consists of four processes.

🔹 Step 2:
The four processes in a Carnot cycle are:

Isothermal Expansion – The gas absorbs heat from the source at constant temperature.

Adiabatic Expansion – The gas expands without heat exchange and cools down.

Isothermal Compression – The gas releases heat to the sink at a lower constant temperature.

Adiabatic Compression – The gas is compressed without heat exchange and its temperature rises.

🔹 Step 3:
Since the cycle starts by taking heat from a hot reservoir, the first step is isothermal expansion, where the gas expands and absorbs heat at a constant high temperature.

🔹 Step 4:
This expansion occurs slowly enough for the temperature to remain constant, allowing maximum heat absorption.

✅ Final Answer: (A) isothermal expansion 🚀

🔥 Pro Tip:
Always remember — Carnot cycle begins with absorbing heat from the hot source, which means isothermal expansion comes first!



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