Materials Science Multiple Choice Questions & Answers (MCQs) on “Isomorphous Alloys”.
1. How many components are present in unary phase system?
a) 1
b) 2
c) 3
d) 4
Answer: a
Clarification: 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
Answer: a
Clarification: 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
Answer: a
Clarification: 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
Answer: b
Clarification: 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
Answer: c
Clarification: 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
Answer: b
Clarification: 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
Answer: d
Clarification: 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