Fall 2024 Structure & Properties of Materials - MANE2220
Quiz #4
1. Solubility limit is the ________ concentration of a component that can be dissolved in
another component within a given phase.
a) maximum
b) minimum
c) averaged
2. Which of the following phases ARE NOT possible in a Binary isomorphous system?
a) 𝛼 + L phase
b) L phase
c) 𝛼 + 𝛽 phase
3. In a mixed phase region, COMPOSITION of phases are determined using:
a) An isothermal tie line
b) a solidus line
c) a vertical line
d) lever rule
4. Sum of weight fractions of all phases present at a given temperature and composition is:
a) 0
b) 1
c) between 0 and 1
5. Weight fractions of the phases present in an alloy are determined by:
a) Lever rule
b) Home Rothery rule
c) Gibbs phase rule
6. Cored structure is formed with ______ cooling.
a) slow
b) fast
c) no
7. Which of the following is a peritectic reaction?
a) L → 𝛼 + 𝛽
b) 𝛾 → 𝛼 + 𝛽
c) L + 𝛼 → 𝛾
, 8. In a binary eutectic system, the components have ________ solid solubility in each other.
a) zero
b) limited
c) complete
9. Melting point of eutectic alloy is higher than that of its components.
a) True
b) False
10. 𝛾-phase on an iron-iron carbide phase diagram is also called:
a) Austenite
b) Cementite
c) Ferrite
d) Pearlite
11. Which of the following is a eutectoid reaction?
a) L → 𝛼 + 𝛽
b) 𝛾 → 𝛼 + 𝛽
c) L + 𝛼 → 𝛾
12. Solvus is a solubility limit between:
a) 𝛼 and 𝛼 + 𝛽
b) 𝛼 and 𝛼 + L
c) L and 𝛼 + L
13. An alloy composition that is less than the eutectic composition is termed:
a) hypo-eutectic
b) hyper-eutectic
c) sub-eutectic
d) super-eutectic
13. Single phase regions are always separated by two phase regions.
T
F
14. At invariant point
a. only one phase exists
b. Two phases are in eq with each other
c. Three phases are in eq with each other
d. Four phases are in eq with each other
Quiz #4
1. Solubility limit is the ________ concentration of a component that can be dissolved in
another component within a given phase.
a) maximum
b) minimum
c) averaged
2. Which of the following phases ARE NOT possible in a Binary isomorphous system?
a) 𝛼 + L phase
b) L phase
c) 𝛼 + 𝛽 phase
3. In a mixed phase region, COMPOSITION of phases are determined using:
a) An isothermal tie line
b) a solidus line
c) a vertical line
d) lever rule
4. Sum of weight fractions of all phases present at a given temperature and composition is:
a) 0
b) 1
c) between 0 and 1
5. Weight fractions of the phases present in an alloy are determined by:
a) Lever rule
b) Home Rothery rule
c) Gibbs phase rule
6. Cored structure is formed with ______ cooling.
a) slow
b) fast
c) no
7. Which of the following is a peritectic reaction?
a) L → 𝛼 + 𝛽
b) 𝛾 → 𝛼 + 𝛽
c) L + 𝛼 → 𝛾
, 8. In a binary eutectic system, the components have ________ solid solubility in each other.
a) zero
b) limited
c) complete
9. Melting point of eutectic alloy is higher than that of its components.
a) True
b) False
10. 𝛾-phase on an iron-iron carbide phase diagram is also called:
a) Austenite
b) Cementite
c) Ferrite
d) Pearlite
11. Which of the following is a eutectoid reaction?
a) L → 𝛼 + 𝛽
b) 𝛾 → 𝛼 + 𝛽
c) L + 𝛼 → 𝛾
12. Solvus is a solubility limit between:
a) 𝛼 and 𝛼 + 𝛽
b) 𝛼 and 𝛼 + L
c) L and 𝛼 + L
13. An alloy composition that is less than the eutectic composition is termed:
a) hypo-eutectic
b) hyper-eutectic
c) sub-eutectic
d) super-eutectic
13. Single phase regions are always separated by two phase regions.
T
F
14. At invariant point
a. only one phase exists
b. Two phases are in eq with each other
c. Three phases are in eq with each other
d. Four phases are in eq with each other
