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Phase Transformation
Phase Transformation Interview
Quiz 1
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Q.1
Which rule gives the relative number of moles of α and β that must be present, if the overall composition is given as some X? (α, β are stable forms of 2 substance)
a) Richard’s Rule
b) Raoul’s Rule
c) Henry’s Rule
d) Lever rule
Q.2
Properties of metallic material primarily depends on _____________
a) Processing
b) Type of crystal structure
c) Microstructure
d) Grain size
Q.3
The driving force for the phase transformation increases in proportion to__________
a) Microstructure
b) Change in composition
c) Degree of undercooling below critical temperature
d) Melting point
Q.4
In a general sense it is not possible to obtain any information about kinetics or the morphology of the phase mixture from the phase diagram.
a) True
b) False
Q.5
The first step in drawing the free energy curve of the FCC α phase is, to convert the stable BCC arrangement of β atoms into ____________
a) An unstable FCC arrangement
b) A stable FCC arrangement
c) A metastable BCC arrangement
d) An unstable BCC arrangement
Q.6
Which among the following condition the most stable state of a system should satisfy so that it can be defined as a state in which pure component has unit activity?
a) Highest free energy
b) Lowest free energy
c) Change in Gibbs energy 0
d) Positive free energy
Q.7
In heterogeneous systems containing more than one phase the pure components can, at least theoretically, exist in different crystal structures.
a) True
b) False
Q.8
Calculate the number of phases present in a system in equilibrium, if the degree of freedom isthe number of components and non-compositional variables are 1 and 2 respectively?
a) 1
b) 3
c) 0
d) 2
Q.9
What happens when the two Gibbs energy curves for the α- and β-phases have a common tangent and the equilibrium has been established?
a) Driving force for diffusion increases
b) Driving force for diffusion decreases
c) Driving force for diffusion remains constant
d) Driving force first decreases then increases
Q.10
The condition for equilibrium in a heterogeneous system containing two phases can also be expressed using the_____________
a) Lever’s concept
b) Raoults rule
c) Henrys rule
d) Activity concept
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