Explore topic-wise MCQs in Phase Transformation.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.

1.

Calculate the driving force at temperature 300K if the value of Xi (Concentration adjacent to the interface) and Xe (equilibrium concentration) are given as 4mols and 2mols respectively?

A. 300Rln3
B. 300Rln2
C. 150Rln2
D. 150Rln3
E. and Xe (equilibrium concentration) are given as 4mols and 2mols respectively?a) 300Rln3b) 300Rln2c) 150Rln2d) 150Rln3
Answer» C. 150Rln2
Discussion
2.

Growth ledges are by no means restricted to solid/solid systems.

A. True
B. False
Answer» B. False
Discussion
3.

If a single atom attaches itself to a flat close-packed interface it will raise the interfacial free energy.

A. False
B. True
Answer» C.
Discussion
4.

The accommodation factor (A) at the incoherent interfaces and diffuse solid/liquid interfaces can be close to________

A. at the incoherent interfaces and diffuse solid/liquid interfaces can be close to________a) 0
B. 1
C. 0.5
D. 6
Answer» C. 0.5
Discussion
5.

What happens to the driving force Δμ, when Xi (Concentration adjacent to the interface) approaches Xe (equilibrium concentration)? (For a dilute or ideal solution)

A. Δμ=0
B. Δμ>0
C. Δμ<0
D. Δμ cannot be predicted
E. approaches Xe (equilibrium concentration)? (For a dilute or ideal solution)a) Δμ=0b) Δμ>0c) Δμ<0d) Δμ cannot be predicted
Answer» B. Δμ>0
Discussion
6.

In the limit of a very low mobility it is possible that ____

A. (∂C/∂x) interface = 0
B. (∂C/∂x) interface > 0
C. (∂C/∂x) interface < 0
D. (∂C/∂x) interface = 1
Answer» B. (∂C/∂x) interface > 0
Discussion
7.

If we consider a β precipitate of an almost pure metal B with Interface mobility given as M, Molar volume V of the β phase, and the driving force is given as Δμ. Calculate the flux across the interface?

A. J = MΔμ/V²
B. J = -MΔμ/V
C. J = -MΔμ/V²
D. J = MΔμ/V
Answer» D. J = MΔμ/V
Discussion
8.

Just for a simplicity consider a pure substance B. By analogy with the migration of a high-angle grain boundary the net flux of B across the interface will produce an interface velocity v given by____(Interface mobility is given as M, Molar volume V, and the driving force is given as Δμ)

A. MΔμ/V
B. MΔμ +V
C. M/Δμ*V
D. MV/Δμ
Answer» B. MΔμ +V
Discussion
9.

Martensitic transformations belongs to____

A. Base transformation
B. Civilian transformation
C. Military transformation
D. Mixed transformation
Answer» D. Mixed transformation
Discussion
10.

During civilian transformations the parent and product will have _____ (Composition).

A. Same composition
B. Different composition
C. Time dependent composition
D. Nothing can be predicted
Answer» E.
Discussion
11.

Civilian transformation is a phenomenon that occurs when the uncoordinated transfer of atoms occurs across a____________

A. Glissile interface
B. Mixed interface
C. Partially coherent interface
D. Non-Glissile interface
Answer» E.
Discussion
12.

The migration of which among the following interfaces is extremely sensitive to temperature?

A. Mixed
B. Corrupted
C. Glissile
D. Non-Glissile
Answer» E.
Discussion
13.

Athermal migration is related to which of the following interface?

A. Mixed
B. Corrupted
C. Non-Glissile
D. Glissile
Answer» E.
Discussion
14.

Most of the transformation products are formed during the growth stage by the_____

A. Transfer of atoms across the moving parent/product interface
B. Movement of atoms in the formed nuclei
C. Nucleation
D. Random oscillation of parent particle
Answer» B. Movement of atoms in the formed nuclei
Discussion
15.

In a way we can say that an interface is created during the____

A. Nucleation
B. Destruction
C. Vibration
D. Growth
Answer» B. Destruction
Discussion