This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Isomorphous Alloys”.
1. How many components are present in unary phase system?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Unary phase systems which consist of a single component. Phase systems with two components are called binary systems and those with three are called ternary systems.
2. In a binary isomorphous system which of the following is true?
a) The two metals are completely miscible in each other in liquid as well as solid form
b) The two metals are completely immiscible in each other in liquid as well as solid form
c) The two metals are completely miscible in each other in liquid form only
d) The two metals are completely miscible in each other in solid form only
View Answer
Explanation: In a binary isomorphous system, the two metals are completely miscible in each other in liquid as well as solid form.
3. The number of components are 2, the number of phases are 3 and degrees of freedom are 0. Then which of the following equilibrium is it?
a) Invariant
b) Univariant
c) Bivariant
d) Trivariant
View Answer
Explanation: We can solve the above question by using Gibb’s phase rule. When the given values are put in the equation the value is obtained to be zero which makes the reaction invariant.
4. The number of components are 2, the number of phases are 2 and degrees of freedom are 1. Then which of the following equilibrium is it?
a) Invariant
b) Univariant
c) Bivariant
d) Trivariant
View Answer
Explanation: We can solve the above question by using Gibb’s phase rule. When the given values are put in the equation the value is obtained to be one which makes the reaction univariant.
5. The number of components are 2, the number of phases is 1 and degrees of freedom are 2. Then which of the following equilibrium is it?
a) Invariant
b) Univariant
c) Bivariant
d) Trivariant
View Answer
Explanation: We can solve the above question by using Gibb’s phase rule. When the given values are put in the equation the value is obtained to be two which makes the reaction bivariant.
6. An alloy 30 wt% Ni- 70wt % Cu at 1315 °C (2400 °F) will lie in which state?
a) Solid state
b) Liquid state
c) Mixture of solid and liquid state
d) α state
View Answer
Explanation: An alloy 30 wt% Ni- 70wt % Cu at 1315 °C (2400 °F) will lie in the liquid state which we can observe from its phase diagram.
7. An alloy 30 wt% Ni- 70wt % Cu at 1095 °C (2000 °F) will lie in which state?
a) Solid state
b) Liquid state
c) Mixture of solid and liquid state
d) α state
View Answer
Explanation: An alloy 30 wt% Ni- 70wt % Cu at 1095 °C (2000 °F) will lie in the region where it is in α state which can be observed from its phase diagram.
8. The copper-nickel system is an example of solid solution hardening.
a) True
b) False
View Answer
Explanation: The above statement is true and the copper-nickel system is an example of solid solution hardening. Therefore changes are caused due to distortion in its lattice structure.
9. In a copper nickel system the tensile strength increases with an increase in the percentage of nickel in the alloy.
a) True
b) False
View Answer
Explanation: The above statement is true. As nickel has more tensile strength than copper, the tensile strength of copper increases with the increase in the percentage of nickel in the alloy.
10. In which of the following the alloy is rapidly cooled?
a) Anealing
b) Coring
c) Hot working
d) Cold working
View Answer
Explanation: Hot working, cold working and annealing are all processes in which the alloy will be heated. In coring the alloy is rapidly cooled down.
Sanfoundry Global Education & Learning Series – Materials Science.
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