GATE ME 2020 Set 2 — Question 21

MCQ+1 / -0.33EasyBinary Phase Diagrams & Lever RuleStructure & PropertiesEngineering Materials

Engineering Materials → Structure & Properties → Binary Phase Diagrams & Lever Rule

Last updated 5 September 2026

Question

Which one of the following statements about a phase diagram is INCORRECT ?

Correct answer (C) It gives information on transformation rates Solution Phase diagrams are equilibrium diagrams that represent the stable phases of a material system at various temperatures, pressures, and compositions. (A) Correct: Solidus and liquidus lines indicate melting/solidification temperatures. (B) Correct: The lever rule is used to find the relative amounts of phases in equilibrium. (D) Correct: Solvus lines indicate the limits of solid solubility. (C) Incorrect: Phase diagrams do not provide kinetic information such as transformation rates. Transformation rates are found in TTT (Time-Temperature-Transformation) or CCT (Continuous Cooling Transformation) diagrams. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (C) It gives information on transformation rates Solution Phase diagrams are equilibrium diagrams that represent the stable phases of a material system at various temperatures, pressures, and compositions. (A) Correct: Solidus and liquidus lines indicate melting/solidification temperatures. (B) Correct: The lever rule is used to find the relative amounts of phases in equilibrium. (D) Correct: Solvus lines indicate the limits of solid solubility. (C) Incorrect: Phase diagrams do not provide kinetic information such as transformation rates. Transformation rates are found in TTT (Time-Temperature-Transformation) or CCT (Continuous Cooling Transformation) diagrams.

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