ASU MSE 250 FINAL REVIEW QUESTIONS
1. What is a phase of a substance that is mechanically separable?
a. The substance which is physically distinct
b. The substance which is homogenous chemically
c. The substance which is both physically distinct and chemically homogenous
d. The substance which is both physically distinct and chemically heteroge-
neous- Answer - The substance which is both physically distinct and chemically homogenous
2. In GENERAL, what are the external parameters that affect the existence of the
phase(s)?- Answer - Temperature, Pressure, Composition
3. Solubility limit- Answer - The maximum concentration of solute atoms that dissolve in a solvent to form a solid
solution at a certain temperature
4. This is an example of a unary phase diagram
a. Cu-Ni phase diagram
b. Water phase diagram
c. Cu-Pd phase diagram
d. Mg-Al phase diagram- Answer - Water phase diagram
5. What is the phase fraction of an alloy when it is one phase system?
a. 0.6
b. 0.8
c. 0.8
d. 1.0- Answer - 1.0
6. What will be the phase composition of single-phase system?
a. Same as alloy present in it
b. Different than the alloy present in it
,c. Contains more than one alloy
d. Varies from molecule to molecule- Answer - Same as alloy present in it
7. The phases on either side along phase boundaries are ?
a. Equal
b. In Equilibrium
c. Different
d. Constant- Answer - In Equilibrium
8. Which of the following is/are components of a phase in a binary system?
a. Brass, Copper, Zinc
,b. Copper only
c. Zinc only
d. Both Copper and Zinc- Answer - Both Copper and Zinc
9. Isomorphous system- Answer - two elements completely soluble in each other in liquid and solid state
10. If two components are soluble in each other in the entire range of composi-
tions in both the liquid and solid state, the system is known as
a. Binary phase system
b. unary phase system
c. Multiple phase system
d. Isomorphous system- Answer - Isomorphous system
11. What is used for the determination of phase amounts or relative fractions of
the phases- Answer - Lever Rule
12. If the degrees of freedom in a condensed 2-component and 3-phase is zero
which of the following equilibrium is it?
a. Invariant
b. Univariant
c. Bivariant
d. Trivariant- Answer - Invariant
13. If the degrees of freedom in a condensed 2-component and 2-phase is one
which of the following equilibrium is it?
a. Invariant
b. Univariant
c. Bivariant
d. Trivariant- Answer - Univariant
, 14. Solvus line- Answer - lines defining border between the pure solid phase and a blend of two solid phases
on a phase diagram
15. Peritectic point- Answer - Liquid and one solid phase transform to a second solid phase
16. Eutectoid point- Answer - One solid phase transforms into two other solid phases
17. Eutectic point- Answer - Liquid phase transforms into two solids phase
18. What is the principal difference between congruent and incongruent
phase transformations- Answer - Incongruent phase change is when a phase change occurs and the
composition of the material changes. Congruent is when the Phase changes but the chemical composition is
constant.
1. What is a phase of a substance that is mechanically separable?
a. The substance which is physically distinct
b. The substance which is homogenous chemically
c. The substance which is both physically distinct and chemically homogenous
d. The substance which is both physically distinct and chemically heteroge-
neous- Answer - The substance which is both physically distinct and chemically homogenous
2. In GENERAL, what are the external parameters that affect the existence of the
phase(s)?- Answer - Temperature, Pressure, Composition
3. Solubility limit- Answer - The maximum concentration of solute atoms that dissolve in a solvent to form a solid
solution at a certain temperature
4. This is an example of a unary phase diagram
a. Cu-Ni phase diagram
b. Water phase diagram
c. Cu-Pd phase diagram
d. Mg-Al phase diagram- Answer - Water phase diagram
5. What is the phase fraction of an alloy when it is one phase system?
a. 0.6
b. 0.8
c. 0.8
d. 1.0- Answer - 1.0
6. What will be the phase composition of single-phase system?
a. Same as alloy present in it
b. Different than the alloy present in it
,c. Contains more than one alloy
d. Varies from molecule to molecule- Answer - Same as alloy present in it
7. The phases on either side along phase boundaries are ?
a. Equal
b. In Equilibrium
c. Different
d. Constant- Answer - In Equilibrium
8. Which of the following is/are components of a phase in a binary system?
a. Brass, Copper, Zinc
,b. Copper only
c. Zinc only
d. Both Copper and Zinc- Answer - Both Copper and Zinc
9. Isomorphous system- Answer - two elements completely soluble in each other in liquid and solid state
10. If two components are soluble in each other in the entire range of composi-
tions in both the liquid and solid state, the system is known as
a. Binary phase system
b. unary phase system
c. Multiple phase system
d. Isomorphous system- Answer - Isomorphous system
11. What is used for the determination of phase amounts or relative fractions of
the phases- Answer - Lever Rule
12. If the degrees of freedom in a condensed 2-component and 3-phase is zero
which of the following equilibrium is it?
a. Invariant
b. Univariant
c. Bivariant
d. Trivariant- Answer - Invariant
13. If the degrees of freedom in a condensed 2-component and 2-phase is one
which of the following equilibrium is it?
a. Invariant
b. Univariant
c. Bivariant
d. Trivariant- Answer - Univariant
, 14. Solvus line- Answer - lines defining border between the pure solid phase and a blend of two solid phases
on a phase diagram
15. Peritectic point- Answer - Liquid and one solid phase transform to a second solid phase
16. Eutectoid point- Answer - One solid phase transforms into two other solid phases
17. Eutectic point- Answer - Liquid phase transforms into two solids phase
18. What is the principal difference between congruent and incongruent
phase transformations- Answer - Incongruent phase change is when a phase change occurs and the
composition of the material changes. Congruent is when the Phase changes but the chemical composition is
constant.
