Powder Preparation and Sintering - Processing of Materials - Engineering Sciences Previous Year Questions

1

2010 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2010

Match the following materials in Column I with appropriate preparation technique given in Column II

A

P. single crystals of laser materials, Q. highly dense fine grained ceramics, R. nanocrystalline oxide powders, S. metallic glasses

B

1. sol-gel, 2. melt spinning, 3. Bridgman-Stockbarger, 4. hot pressing, 5. Czochralski

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2

2015 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2015

Which is NOT a ceramic forming process?

A

extrusion

B

slip casting

C

forging

D

tape casting

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3

2016 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2016

Match the following processes and the products obtained:
P: Mechanical attrition      1: Thin films
Q: Physical vapour deposition      2: Plastics
R: Injection moulding      3: Nanoparticles
S: Sintering      4: Rails
                         5: Carbide tools

A

P-1, Q-2, R-3, S-5

B

P-3, Q-1, R-2, S-5

C

P-4, Q-1, R-3, S-2

D

P-3, Q-4, R-1, S-2

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4

2017 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2017

Match the processes in Column I with products in Column II

Column I
(P) Slip casting
(Q) Zone refining
(R) Sputtering
(S) Atomization

Column II
(1) Metal powders
(2) Thin films
(3) Ceramic parts
(4) Single crystal
(5) Metal sheets

A

P-3; Q-4; R-2; S-1

B

P-2; Q-1; R-2; S-1

C

P-3; Q-4; R-5; S-1

D

P-3; Q-4; R-1; S-5

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5

2020 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2020

Read the two statements related to sintering and select the correct option.

Statement-1: Sintering in vacuum leads to improved densification as compared to sintering under ambient (at atmospheric pressure) condition.

Statement-2: Closed pores formed during sintering inhibit full densification.

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6

2020 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2020

Select the correct option that appropriately matches the process to the material/product that can be fabricated using them.

Process	Material/Product
(I) Powder processing	(P) Organic semiconductor thin films
(II) Spin coating	(Q) Single crystal silicon
(III) Czochralski process	(R) Poly-silicon
(IV) Chemical vapor deposition	(S) Porous bronze bearings

A

I-S, II-P, III-R, IV-Q

B

I-S, II-R, III-Q, IV-P

C

I-S, II-P, III-Q, IV-R

D

I-P, II-R, III-Q, IV-S

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7

2021 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2021

A certain ceramic has a theoretical density and sintered density of \(6.76 \; \mathrm{g \; cm^{-3}}\) and \(6.60 \; \mathrm{g \; cm^{-3}}\), respectively. The green compact has 18 volume percent porosity. For a sintered cube of side 2 cm, the required side of the cubic green compact in cm is __________ (round off to 2 decimal places)

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8

2024 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2024

In ball milling of ceramic powder, selection of grinding media depends on the __________ difference between grinding media and powder particles.

A

thermal conductivity

B

dielectric constant

C

hardness

D

density

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9

2026 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2026

Which of these methods is/are used for the synthesis of ceramic powders?

A

Sol-gel

B

Hydromechanical

C

Thermomechanical

D

Hydrothermal

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10

2026 · Engineering Sciences · Processing of Materials · Powder Preparation and Sintering

Engineering Sciences (XE) 2026

A circular disk-shaped ceramic green body has a relative density of 50%. On sintering, both the height and the diameter of the disk shrink by 20%. The sintered disk’s relative density, in %, is __________ (rounded off to one decimal place).

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