# Gibbs Phase Rule MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Gibbs Phase Rule”.

1. What is Gibbs phase rule for metallurgical system?
a) F = C – 1 – P
b) F = C + 1 – P
c) P + F = C – 2
d) P + F = C + 2

2. In a single – component condensed system, if degree of freedom is zero, maximum number of phases that can co – exist _________
a) 2
b) 3
c) 0
d) 1

3. What is Gibbs phase rule for general system?
a) P = C – 1 – F
b) P = C + 1 – F
c) P + F = C – 2
d) P + F = C + 2

4. The degree of freedom at a triple point in the unary diagram for water is ________
a) 2
b) 3
c) 0
d) 1

5. What is degree of freedom when two phases co – exist?
a) 2
b) 3
c) 0
d) 1

6. For single component system when degree of freedom is 1(one) then number of phases _______
a) 2
b) 3
c) 0
d) 1

7. What is degree of freedom for single – phase fields on the phase diagram?
a) 2
b) 3
c) 0
d) 1

8. What is degree of freedom when three phases co – exist?
a) 2
b) 3
c) 0
d) 1

9. When α, L and β phase fields touch the isotherm line what are the respective phase compositions?

a) 8.0 wt%, 71.9 wt%, 91.2 wt% of Ag
b) 8.0 wt%, 91.2 wt%, 71.9 wt% of Ag
c) 71.9 wt%, 91.2 wt%, 8.0 wt% of Ag
d) 91.2 wt%, 8.0 wt%, 71.9 wt% of Ag

10. For binary alloy consisting of three phases of non – equilibrium one, What will be the temperature of these phases?

a) Different
b) Constant
c) Same
d) Two of them will be with one temperature

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