This set of Phase Transformation online test focuses on “Tracer Diffusion in Binary Alloys”. 1. With increase in annealing time the penetration distance __________ a) Remains constant b) Increases c) Decreases d) First decreases then increases 2. Pre-exponential factor and the activation energy does not depend on ___ a) Elastic modulus of material b) Lattice … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Diffusion – Atomic Mobility”. 1. The potential energy of the atom will then be relatively high due to the strain in the surrounding matrix. However, this strain energy can be reduced if the atom is located in a position where it better … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Substitutional Diffusion”. 1. In a substitutional diffusion, the diffusion coefficient can be related to the jump frequency by the equation_______ (α=distance between the planes, Ʈ=jump frequency, f=correlation factor) a) D = (1/6)*α2*Ʈ b) D = (1/2)*α2*Ʈ c) D = f*(1/6)*α2*Ʈ d) D … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Interstitial Diffusion”. 1. If plane (1) contains 5 B-atoms per metre square, calculate the number of atoms that will jump from plane (1) to (2) in 1s? (Assume that on average, an interstitial atom jumps 6 times per second) a) 5 b) … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Atomic Mechanism of Diffusion”. 1. The mean vibrational energy possessed by each atom at 300K is given by__________ (In joules) a) 4.14*10-23 b) 1.242*10-20 c) 1.242*10-23 d) 1.242*10-21 2. Which of the following atoms use the vacancy mechanism to diffuse? a) Large … Read more
This set of Phase Transformation Questions and Answers for Aptitude test focuses on “Kinetics of Phase Transformation”. 1. Which among the following condition should be satisfied by homogeneous nucleation? a) Occurs slowly b) Occurs at the preferential site c) Occurs in an orderly fashion d) Occurs randomly 2. Which among the following condition should be … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Ternary Equilibrium”. 1. The composition of a ternary alloy can be indicated on a ___________ a) Thomson’s triangle b) Hershel’s triangle c) Gibbs triangle d) Harley’s triangle 2. The chemical potentials of A, B and C in any phase are then given … Read more
This set of Phase Transformation Questions and Answers for Freshers focuses on “Influence of Interface on Equilibrium”. 1. The surface of a single crystal (of a pure element) is an example of a_________ a) Solid-Vapor interface b) Solid-Liquid interface c) Solid-Solid interface d) Liquid-Liquid interface 2. Grain boundaries are an example of a_________ a) Solid-Vapor … Read more
This set of Phase Transformation Multiple Choice Questions & Answers (MCQs) focuses on “Binary Phase Diagrams”. 1. Which among the following condition about a simple binary system is not a part of Hume- Rothery rule? a) Same crystal structure b) Size difference is less than 15 c) Electronegativity’s have similar values d) Composition should be … Read more
This set of Phase Transformation Interview Questions and Answers focuses on “Equilibrium in Heterogeneous Systems”. 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 … Read more
