Material Science/ Phase Diagrams Multiple Choice Questions
Multiple Choice Questions:
1. Gibbs phase rule for general system:
(a) P+F=C-1 (b) P+F=C+1 (c) P+F=C-2 (d) P+F=C+2
2. In a single-component condensed system, if degree of freedom is zero, maximum number of phases
that can co-exist _________.
(a) 0 (b) 1 (c) 2 (d) 3
3. The degree of freedom at triple point in unary diagram for water ________.
(a) 0 (b) 1 (c) 2 (d) 3
4. Above the following line, liquid phase exist for all compositions in a phase diagram.
(a) Tie-line (b) Solvus (c) Solidus (d) Liquidus
5. Following is wrong about a phase diagram.
(a) It gives information on transformation rates.
(b) Relative amount of different phases can be found under given equilibrium conditions.
(c) It indicates the temperature at which different phases start to melt.
(d) Solid solubility limits are depicted by it.
6. Not a Hume-Ruthery condition:
(a) Crystal structure of each element of solid solution must be the same.
(b) Size of atoms of each two elements must not differ by more than 15%.
(c) Elements should form compounds with each other.
(d) Elements should have the same valence.
7. Pick the odd one in the following:
(a) Isomorphous alloy (b) Terminal solid solution
(c) Intermediate solid solution (d) Compound
8. The boundary line between (liquid) and (liquid+solid) regions must be part of _________.
(a) Solvus (b) Solidus (c) Liquidus (d) Tie-line
9. The boundary line between (liquid+solid) and (solid) regions must be part of _________.
(a) Solvus (b) Solidus (c) Liquidus (d) Tie-line
10. The boundary line between (alpha) and (alpha+beta) regions must be part of _________.
(a) Solvus (b) Solidus (c) Liquidus (d) Tie-line
11. Horizontal arrest in a cooling curve represents:
(a) Continuous cooling (b) Invariant reaction (c) Both (d) None
12. Relative amounts of phases in a region can be deduced using
(a) Phase rule (b) Lever rule (c) Either (d) None
13. An invariant reaction that produces a solid up on cooling two liquids:
(a) Eutectic (b) Peritectic (c) Monotectic (d) Syntectic
14. A solid + a liquid result in a liquid up on heating during __________ reaction.
(a) Eutectic (b) Peritectic (c) Monotectic (d) Syntectic
15. A solid + a liquid result in a solid up on cooling during __________ reaction.
(a) Eutectic (b) Peritectic (c) Monotectic (d) Syntectic
16. On heating, one solid phase results in another solid phase plus on liquid phase during ___ reaction.
(a) Eutectic (b) Peritectic (c) Monotectic (d) Syntectic
17. A solid phase results in a solid plus another solid phase up on cooling during __________ reaction.
(a) Eutectoid (b) Peritectoid (c) Eutectic (d) Peritectic
18. A solid phase results in a solid plus another solid phase up on heating during __________ reaction.
(a) Eutectoid (b) Peritectoid (c) Monotectoid (d) None
19. A liquid phase produces two solid phases during _________ reaction up on cooling.
(a) Eutectic (b) Eutectoid (c) Peritectic (d) Peritectoid
20. Liquid phase is involved in the following reaction:
(a) Eutectoid (b) Peritectoid (c) Monotectoid (d) None
21. Not a basic step of precipitation strengthening
(a) Solutionizing (b) Mixing and compacting (c) Quenching (d) Aging
Satish V. Kailas/IISc, Bangalore M7/V1/June 04/1
