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Process Calculations
Laws of Thermodynamics
GATE 2017
Medium

Water is heated at 1 atm from 40°C to 80°C by two processes: I (single 80°C source), II (40→60°C via a 60°C source, then 60→80°C via an 80°C source). Identify the correct statement.

  • AEnthalpy change of water in process I is greater than in process II
  • BEnthalpy change of water in process II is greater than in process I
  • CProcess I is closer to reversibility
  • Process II is closer to reversibility

Explanation

Enthalpy change is a state function — identical for both processes (same start/end states). Process II uses smaller temperature differences at each stage, making it closer to reversible heat transfer.

Source: GATE CH 2017 (2017)

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