Assignment 3

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29/12/2017 Phase Transformation in Materials - - Unit 4 - Week 3

https://onlinecourses.nptel.ac.in/noc17_me20/unit?unit=35&assessment=41 1/3

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1 point 1)

1 point 2)

1 point 3)

1 point 4)

liquid + (alpha) phase = (beta) phase is a ___________ reaction.

Eutectic Peritectic Monotectic Syntectic

Accepted Answers:

Peritectic

Which of the following phase diagram shows liquid immiscibility ? Eutectic

Peritectic Monotectic Eutectoid None of these

Monotectic

Application (or increase) of pressure will result in _________ in melting temperature of water.

Increase Decrease Remains constant Can't be defined

Decrease

Change in Gibbs free energy is _____ related to interfacial energy and _____ related to radius of precipitate.

directly, inversely inversely, directly directly, directly

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1 point 5)

1 point 6)

1 point 7)

1 point 8)

1 point 9)

inversely, inversely

directly, inversely

Low angle tilt boundary is an array of _______ . screw dislocations

edge dislocations vacancies stacking faults

edge dislocations

The thermodynamic driving force for diffusion is : concentration gradient

chemical potential gradient temperature gradient none of these

chemical potential gradient

Interstitial diffusion is _____ than vacancy diffusion.

rapid sluggish

both have same velocity none of these

rapid

Diffusion flux is _____ . scalar

vector dimensionless tensor of rank 3

vector

This equation is known as : Clausius

Clausius Clapeyron Gibbs Duhem None of these

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1 point 10)

Clausius Clapeyron

Concentration vs Distance plots resemble _____________ . Lognormal distribution

Binomial distribution Lorentzian distribution Gaussian distribution

Gaussian distribution