Phase Transformation MCQs | Part - II | Material Science MCQs

This set of Engineering Materials Science "Multiple Choice Questions & Answers" are based on "PHASE TRANSFORMATION" 

 

PHASE TRANSFORMATION

Multiple Choice Questions (MCQ)

Hello reader, here you can find some MCQ with answers. But before reading this I will suggest you take a practice test on these questions given below. so you can understand your strength on this topic.

Click here to go Practice Test section on this topic namely Phase Transformation.

But if you want to read this topic first and then practice it then read it carefully.  The Multiple Choice Questions (MCQ) based on Phase Transformation are given below:

PART - II

1) If the rate of cooling of a liquid metal is rapid, the temperature of freezing/crystallization will

A. Increase

B. Decrease

C. Remains constant

D. None of the above

Correct Answer is "B"

If the rate of cooling of a liquid metal is rapid, the temperature of freezing/crystallization will decrease

2) During heterogeneous nucleation if the product phase does not wet at all the parent phase, the contact angle between the two phases is

A. 0°

B. 45°

C. 90°

D. 180°

Correct Answer is "D"

If the product phase does not wet at all the parent phase, the contact angle between the two phases is 180°

3) The activation free energy of homogeneous nucleation is higher than heterogeneous nucleation Which of the following is true?

A. ∆T_{(Heterogeneous nucleation)} = ∆T_{(Homogeneous nucleation)}

B. ∆T_{(Heterogeneous nucleation)} < ∆T_{(Homogeneous nucleation)}

C. ∆T_{(Heterogeneous nucleation)} > ∆T_{(Homogeneous nucleation)}

D. None of the above

Correct Answer is "B"

The degree of undercooling for homogeneous nucleation is greater than heterogeneous nucleation.

4) For typical solid transformations, a plot of fraction transformation versus the logarithm of time gives

A. U shaped curved

B. C shaped curve

C. S-shaped curve

D. W shaped curve

Correct Answer is "C"

For typical solid transformations, a plot of fraction transformation versus the logarithm of time gives S-shaped curve

5) The time dependence of the degree of transformation is represented by

A. Maxwell equation

B. Arrhenius equation

C. Hall - Petch equation

D. Avrami equation

Correct Answer is "D"

The time dependence of the degree of transformation is represented by the Avrami equation

6) Slope change in a CCT diagram signify _________

A. Change in pressure

B. Change in state

C. Change in temperature

D. Change in phase

Correct Answer is "D"

Slope change in a CCT diagram signify a Change in phase

7) Martensite transformation is represented by

A. FCC → BCT

B. FCC → BCC

C. BCC → BCT

D. BCT → BCC

Correct Answer is "A"

Martensite transformation is represented by Austenite (FCC) to Martensite (BCT)

8) Phase formed of diffusion-less reaction:

A. Pearlite

B. Bainite

C. Martensite

D. Spheroidite

Correct Answer is "C"

Martensite Phase formed in a diffusion-less reaction.

9) Impurity which is not responsible for temper embrittlement is

A. Mn

B. Ni

C. As

D. Si

Correct Answer is "D"

Mn, Ni, As all these three responsible for temper embrittlement

10) Temper embrittlement is

A. Increase in hardness

B. Increase in toughness

C. Decrease in hardness

D. Decrease in toughness

Correct Answer is "D"

Temper embrittlement is Decrease in toughness as measured by impact tests

Do you read all the questions and answers given above carefully? let's make a practice on all the questions given above.
Go to:  Practice Test on Phase Transformation (MCQ) Part - II

Suggested Topics:

Phase Transformation Multiple Choice Questions (MCQ) & Answers Part - I

Phase Transformation Multiple Choice Questions (MCQ) & Answers Part - III

Phase Transformation Multiple Choice Questions (MCQ) & Answers All Parts

Phase Transformation Multiple Select Questions (MSQ) & Answers All Parts

Phase Transformation Numerical Problems Questions & Answers All Parts

Phase Transformation Formulas

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