Solidification MCQs : Here you will find MCQ Questions related to "Solidification" in Phase Transformation. These Solidification MCQ Questions Will help you to improve your Phase Transformation knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Question 1
The solidification of pure metals is rarely encountered in practice. Which among the following is a reason for this?
A. Pure metals contain sufficient impurities
B. Pure metals have high value of Tm
C. Pure metals have low melting temperature
D. Pure metals can withstand high pressure
View Answer
Ans : A
Explanation: There are a lot of reasons behind this but the major one is that even though we say something is pure or commercially pure, it contains an amount of impurities that we can consider sufficient to change the characteristics from pure to alloy behavior.
Question 2
Which of the following is known as the equilibrium freezing range of the alloy?
A. T1+T3
B. T1*T3
C. T1-T3
D. T1/T3
View Answer
Ans : C
Explanation: T1 – T3, is known as the equilibrium freezing range of the alloy.
Question 3
Unidirectional solidification has commercial importance.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: The production of creep resistant aligned microstructure for gas turbine blades is actually a commercial example of the unidirectional solidification which highlights its importance. Not only this but this is used during the zone refining for the production of extremely pure metals.
Question 4
Liquid + α(solid phase)->β(solid phase), this kind of reactions are known as?
A. dendrites reaction
B. peritectic reaction
C. eutectic reaction
D. anomalous reaction
View Answer
Ans : B
Explanation: Liquid + α(solid phase)->β(solid phase), this kind of reactions are known as peritectic reaction
Question 5
A planar eutectic front is always stable.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : B
Explanation: A planar eutectic front is not always stable. If for example the binary eutectic alloy contains impurities, or if other alloying elements are present, the interface tends to break up to form a cellular morphology. In this case the impurity that leads to the cellular structure is copper.
Question 6
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
View Answer
Ans : D
Explanation: (i) An outer chill zone of equiaxed crystals, (ii) A columnar zone of elongated or column-like grains, and (iii) A central equiaxed zone. If you take in general these are the three different zones that can be distinguished in solidified alloy ingots.
Question 7
What happens to most metals on solidification?
A. Expand
B. Elongate
C. Shrink
D. No Change
View Answer
Ans : C
Explanation: In general most of the metals shrink on solidification and these affects final ingot structure. There is a decrease in the level of the liquid remaining and this is a consequence of thicker outer shell of solid and with a narrow freezing range the mushy zone is also narrow.
Question 8
In Solidification of Fusion Welds, A fusion-welding operation in which no filler metal is added is referred to as a/an _____
A. Compile weld
B. Autogenous weld
C. Filler Weld
D. Damper weld
View Answer
Ans : B
Explanation: When the filler metals are not added in a fusion-welding operation then it is referred as an autogenous weld Fusion-welding processes and it uses heat to melt the base metals just like the other fusion welding process. Mainly these fillers are added to facilitate the process and to give a strength or toughness to the joints. .
Question 9
In Solidification of Fusion Welds, which joint type, the parts lie in the same plane and are joined at their edges?
A. Corner
B. Lap
C. Tee
D. Butt
View Answer
Ans : D
Explanation: This happens in the case of butt joints. Whereas in corner joints the parts in a corner joint form a right angle and are joined at the corner of the angle and in the case of lap joint the joints consist of two overlapping parts.
Question 10
Calculate the heat density if the power transferred is 1000W and the corresponding surface area is 10m^2?
A. 1
B. 10
C. 100
D. 1000
View Answer
Ans : C
Explanation: Heat density can be calculated using the formula P/A, where P refers to the total power and A the corresponding area. So, in this case 1000/10 = 100W/m^2. High-density heat energy is supplied to the faying surfaces, and the resulting temperatures are sufficient to cause localized melting of the base metals