Sintering MCQs : Here you will find MCQ Questions related to "Sintering" in Powder Metallurgy. These Sintering MCQ Questions Will help you to improve your Powder Metallurgy knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Question 1
Sintering can be classified as ?
A. solid-state
B. viscous
C. liquid-phase
D. All of the above
View Answer
Ans : D
Explanation: Sintering can be classified as solid-state, viscous, liquid-phase, and pressure-assisted (or pressure) sintering.
Question 2
Sintering is a thermal treatment process in which a powder or a porous material, already formed into the required shape, is converted into a useful article with the requisite microstructure.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Sintering is a thermal treatment process in which a powder or a porous material, already formed into the required shape, is converted into a useful article with the requisite microstructure.
Question 3
Sintering also known as?
A. ceramics
B. pyrophoricity
C. frittage
D. coating
View Answer
Ans : C
Explanation: Sintering also known as frittage.
Question 4
Which of the following is advantages of the powder technology?
A. Very high levels of purity and uniformity in starting materials
B. Preservation of purity, due to the simpler subsequent fabrication process (fewer steps) that it makes possible
C. Capability to produce materials of controlled, uniform porosity
D. All of the above
View Answer
Ans : D
Explanation: All of the above is advantages of the powder technology.
Question 5
The process of liquid phase sintering has _______ stages.
A. 2
B. 3
C. 4
D. 5
View Answer
Ans : B
Explanation: The process of liquid phase sintering has three stages: Rearrangement, Solution-Precipitation and Final Densification.
Question 6
Sintering cannot create uniform sizes is an advantages of the powder technology?
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : B
Explanation: Sintering cannot create uniform sizes disadvantages of the powder technology.
Question 7
Doping of Ni in tungsten compacts is an example of _________
A. Activated sintering
B. Reaction sintering
C. Microwave sintering
D. Gas plasma sintering
View Answer
Ans : A
Explanation: The doping of Ni in tungsten compacts is an example of activated sintering. In activated sintering, the addition of a small amount of an alloying element called ‘doping’ increases the rate of densification to a great extent compared to the undoped compacts.
Question 8
Sintering involves _____ types of system.
A. Unary
B. Binary
C. Single component andmulticomponent
D. Ternary
View Answer
Ans : C
Explanation: Sintering may involve (i) single component system, wherein shrinkage is a major factor or (ii) multi-component system, involving more than one phase, where several processes like solid solution formation and liquid phase formation may also occur in addition to densification.
Question 9
In final stage of solid-state sintering, _____ become isolated and are no longer _______
A. Grains, connected
B. Grains, interconnected
C. Pores, open
D. Pores, interconnected
View Answer
Ans : D
Explanation: In the final stage of solid-state sintering, pore channel closure occurs and the pores become isolated and are no longer interconnected. The residual individual pores are located either at the grain boundaries or within the grains. Porosity decreases more quickly in the vicinity of the grain boundary and densification proceeds at a very slow rate.
Question 10
In which stage of solid-state sintering the pores are interconnected and pore shape is irregular?
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : A
Explanation: During the first stage of solid-state sintering, rapid neck formation and neck growth take place in the powder compact. This effect a greater extent of bonding within the sintered mass and thus during this stage the pores are interconnected and the pore shape is irregular.