Mechanical Engineering Exam > Mechanical Engineering Notes > Engineering Materials > GATE Past Year Questions: Phase Diagrams
GATE Past Year Questions: Phase Diagrams | Engineering Materials - Mechanical Engineering PDF Download
Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The crystal structure of austenite is
[ME 2011]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The binary phase diagram of metals P and Q is shown in the figure. An alloy X containing 60% P and 40% Q (by weight) is cooled from liquid to solid state. The fractions of solid and liquid (in weight percent) at 1250°C, respectively, will be
[ME 2019, Set-2]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:Denoting L as liquid and M as solid in a phasediagram with the subscripts representing different phases, a eutectoid reaction is described by
[ME 2018, Set-2]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by a, b, c and d.
Composition (Arbitrary Units)
Composition (Arbitrary Units)
At which temperature will a sample get solutionized the fastest?
[ME 2016, Set-2]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:In a binary system of A and B a liquid of 20% A (80% B) is coexisting with a solid of 70% A(30%B). For an overall composition having 40% A the fraction of solid is
[ME 2016, Set-2]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:If a particular Fe-C alloy contains less than 0.83% carbon, it is called
[ME 2007]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The percentage of carbon in grey cast iron is in the range of
[ME 2004]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The iron carbon diagram and the TTT curves are determined under
[ME 1996]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:Increase in carbon content in plain carbon steel raise its
[PI 1992]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is
[ME 2014, Set-1]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:The main purpose of spheroidising treatment is to improve
[ME 2006]
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Question for GATE Past Year Questions: Phase Diagrams
Try yourself:When 1.0% plane carbon steel is slowly cooled from the molten state to 740°C, the resulting structure will contain
[1990]
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FAQs on GATE Past Year Questions: Phase Diagrams - Engineering Materials - Mechanical Engineering
| 1. What is a phase diagram in mechanical engineering? |  |
Ans. A phase diagram in mechanical engineering is a graphical representation that shows the relationships between the different phases of a substance (solid, liquid, gas) as a function of pressure and temperature. It helps engineers understand the behavior of materials under different conditions.
| 2. How can phase diagrams be used in mechanical engineering? | |
Ans. Phase diagrams are used in mechanical engineering to determine the phase transformations of materials and to predict their behavior under different conditions. Engineers can use phase diagrams to design and optimize materials for specific applications, such as selecting the appropriate heat treatment for a metal alloy.
| 3. What are the common phases represented in a phase diagram? | |
Ans. The common phases represented in a phase diagram are solid, liquid, and gas. Each phase is represented by a different region in the diagram, and the boundaries between these regions indicate the conditions under which phase transitions occur (melting, boiling, etc.).
| 4. How does pressure affect the phase diagram in mechanical engineering? | |
Ans. Pressure can affect the phase diagram in mechanical engineering by shifting the boundaries between different phases. Increasing pressure generally favors the formation of denser phases, such as solids, while decreasing pressure favors the formation of less dense phases, such as gases. This can lead to changes in the stability and behavior of materials.
| 5. Can phase diagrams be used to predict the behavior of mixtures in mechanical engineering? | |
Ans. Yes, phase diagrams can be used to predict the behavior of mixtures in mechanical engineering. By understanding the phase diagram of each component in the mixture, engineers can determine the composition and phase behavior of the mixture under different conditions. This is crucial for designing processes and systems that involve mixtures, such as chemical reactions or separation processes.
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