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.

Shrinkage effects can give rise to what is known as inverse segregation. The effect is particularly marked in alloys with a_______

A. Wide freezing range
B. Short freezing range
C. Wide melting range
D. Short melting range
Answer» B. Short freezing range
Discussion
2.

Which among the following is not a factor that leads to macro-segregation in ingots?

A. Shrinkage due to solidification and thermal contraction
B. Density differences in the interdendritic liquid
C. Density differences between the solid and liquid
D. Expansion due to mild heating
Answer» E.
Discussion
3.

Which among the following is not an important variable in weld solidification or continuous casting?

A. Thickness of plate being welded
B. The rate of heat input
C. Speed of arc movement
D. External condition
Answer» E.
Discussion
4.

What are the two different types of segregation that can be distinguished in solidified structures?

A. Competent and non-competent
B. Semi and complete
C. Macro and micro
D. Full and partial
Answer» D. Full and partial
Discussion
5.

In alloys with a wide freezing range the mushy zone can occupy the whole of the ingot. In this case no central pipe is formed.

A. True
B. False
Answer» B. False
Discussion
6.

In practice the maximum casting speed and billet cross-section are less for steel than for aluminium or copper.

A. True
B. False
Answer» B. False
Discussion
7.

Which among the following can be the reason for the disappearance of the primary dendrites?

A. Growth rate is raised above critical level
B. Under slow growth rate
C. Very minute temperature gradient
D. Forced Growth rate
Answer» B. Under slow growth rate
Discussion
8.

If the lamellar distance k tends to infinity, the free energy change associated with the solidification of 1 mol of liquid is given by_____

A. ΔG(k) = ΔG(infinity) + 2Vm/k
B. ΔG(k) = ΔG(infinity)
C. ΔG(k) = ΔG(infinity) + c
D. ΔG(k) = ΔG(infinity) – 2Vm/k
Answer» C. ΔG(k) = ΔG(infinity) + c
Discussion
9.

There is approximately no temperature gradient perpendicular to the growth direction for a ______

A. Multidirectional solidification
B. Unidirectional solidification
C. Mixed solidification
D. Partial solidification
Answer» C. Mixed solidification
Discussion
10.

The equiaxed zone consists of equiaxed grains. They are oriented randomly in which part the ingot?

A. Bottom edge
B. Centre
C. Right side
D. Top corner
Answer» C. Right side
Discussion
11.

What happens to most metals on solidification?

A. Shrink
B. Expand
C. Elongate
D. No change
Answer» B. Expand
Discussion
12.

The chill zone grow dendritically in certain crystallographic directions. In the case of cubic metals it is given as______

A. <111>
B. <100>
C. <222>
D. <101>
Answer» C. <222>
Discussion
13.

In the chill zone of ingots, if the pouring temperature is low the whole of the liquid will be rapidly cooled below the liquidus temperature and the crystals swept into the melt may be able to continue to grow. This is known as______

A. Big Bang nucleation
B. Rapid quenching
C. Big Boss nucleation
D. Casting prep
Answer» B. Rapid quenching
Discussion
14.

Most engineering alloys begin by being poured or cast into a fireproof container or mould. If the as-cast pieces are permitted to retain their shape afterwards, or are reshaped by machining, they are called as _______

A. Metallurgy
B. Extrusion
C. Casting
D. Ingots
Answer» D. Ingots
Discussion
15.

Which among the following is not a zone in solidified alloy ingots?

A. Columnar zone
B. Outer chill zone
C. Central equiaxed zone
D. Coverage zone
Answer» E.
Discussion