Eutectic Systems MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Eutectic Systems”.

1. What is the point at which three phases (L+α+β) coexist at point E?

materials-science-questions-answers-eutectic-systems-q1

a) Peritectic point
b) Eutectic point
c) Eutectoid point
d) Peritectoid reaction

2. The micro structure of hypoeutectic alloys at room temperature consists of ________

materials-science-questions-answers-eutectic-systems-q1

a) Proeutectic β and α
b) Eutectic mixture (α+β)
c) Proeutectic β and eutectic mixture (α+β)
d) Proeutectic α and eutectic mixture (α+β)

3. What is the line that defines the solubility limit of A in B and B in A from the figure?

materials-science-questions-answers-eutectic-systems-q1

a) Solidus line
b) Liquidus line
c) Solvus line
d) Solidus line and Liquidus line

4. Why Pb-Sn eutectic alloys are used for soldering purpose?
a) The melting point at eutectic point is maximum
b) The melting point at the eutectic point is minimum
c) The melting point at the eutectic point is constant
d) The boiling point at the eutectic point is maximum

5. At point b, the α (alpha) fraction is given by the lever rule as ________

materials-science-questions-answers-eutectic-systems-q5

a) mn/bn
b) bn/mn
c) ab/be
d) be/ab

6. At the eutectic point (e) the eutectic reaction proceeds at a constant temperature as ________

materials-science-questions-answers-eutectic-systems-q7

a) F = 1
b) F = 0
c) F = 2
d) F = 3

7. Crystals of which material begin to form at point a from the figure?

materials-science-questions-answers-eutectic-systems-q5

a) Crystals of proeutectic α
b) Crystals of proeutectic β
c) Crystals of eutectic (α+β)
d) Crystals of proeutectic α and β

8. The inflection in the cooling curve between points a and e is due to _________

materials-science-questions-answers-eutectic-systems-q7

a) Latent heat
b) Low temperature
c) High temperature
d) Specific heat

9. Any composition left of point c or right of point d will cool and solidify like a _______

materials-science-questions-answers-eutectic-systems-q7

a) Eutectic
b) Proeutectic
c) Eutectoid
d) Isomorphous system

10. A 34.6% Pb-Sn alloy is cooled just below the eutectic temperature (183°C). What is the fraction of proeutectic α and eutectic mixture (α+β)?
a) 70% and 30%
b) 64% and 36%
c) 36% and 64%
d) 30% and 70%

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