Powder Metallurgy - Manufacturing Processes - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2007

A typical cooling rate for metal substrate powder atomization is of the order of

A

\(10^4 \text{ Ks}^{-1}\)

B

\(1 \text{ Ks}^{-1}\)

C

\(10^3 \text{ Ks}^{-1}\)

D

\(10^6 \text{ Ks}^{-1}\)

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2

2008 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2008

Transport mechanisms that do NOT contribute to densification during sintering are
(P) surface diffusion
(Q) grain boundary diffusion
(R) bulk diffusion
(S) evaporation-condensation
(T) viscous flow

A

P, Q

B

Q, S

C

Q, T

D

P, S

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3

2008 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2008

Oil impregnated bronze bearings are manufactured using

A

pressure die casting

B

centrifugal casting

C

solid-state sintering

D

liquid phase sintering

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4

2008 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2008

If the powder is compressed to 10 mm height, the initial fill height in mm is

A

12

B

15

C

20

D

25

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5

2008 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2008

The densification parameter of the sintered compact is

A

0.50

B

0.67

C

0.75

D

0.83

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6

2010 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2010

Which of the following are NOT commercially manufactured by powder metallurgy

A

aircraft brake pads

B

self lubricating bearings

C

tungsten carbide based cutting tools

D

turbine blades

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7

2012 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2012

Tungsten filament used in electric bulb is processed by

A

Extrusion

B

Wire drawing

C

Casting

D

Powder metallurgy

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8

2013 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2013

Match the powder production technique given in Group I with the corresponding shape listed in Group II

Group I	Group II
(P) Reduction	(1) Flaky
(Q) Gas Atomization	(2) Spongy
(R) Milling	(3) Dendritic
(S) Electrolysis	(4) Spherical

A

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

B

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

C

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

D

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

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9

2014 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2014

A metal powder with an apparent density of 2.5 g/cm³ was compacted in a cylindrical die to a green density of 5.5 g/cm³. If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been ______

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10

2017 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2017

Tungsten powder is pressed at 150 MPa to a green density of 55%. After sintering, the compact attains 86.5% of its theoretical density. Assuming uniform shrinkage, the linear shrinkage (in %) is ______________ (answer up to two decimal places)

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11

2018 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2018

Consider the following engineering components:
P. Gas turbine blades
Q. Tungsten-based heavy alloy penetrators
R. Self-lubricating bearings
S. Engine block of an automobile
Which of the following two components are produced by powder metallurgy?

A

P & Q

B

Q & R

C

Q & S

D

P & S

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12

2024 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2024

Which one of the following processes is NOT involved in the sintering of a green compact of ceramic powders? Assume that sintering is performed without application of external pressure.

A

Pore shrinkage

B

Dynamic recrystallization

C

Lattice diffusion

D

Grain boundary diffusion

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13

2026 · Metallurgical Engineering · Manufacturing Processes · Powder Metallurgy

Metallurgical Engineering (MT) 2026

Iron powder is compacted at room temperature to 75% of its theoretical density. The as-pressed iron compact is sintered in inert-gas atmosphere at 1200 °C to 90% of its theoretical density. Assuming isotropic shrinkage, the linear shrinkage (in percent) undergone by the iron compact during sintering (rounded off to one decimal place) is ______________ %

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