Material Classification, Bonding and Structure - Materials Science and Non-Metallic Materials - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

In one FCC unit cell, there are

A

4 tetrahedral and 8 octahedral sites

B

8 tetrahedral and 4 octahedral sites

C

12 tetrahedral and 4 octahedral sites

D

4 tetrahedral and 4 octahedral sites

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2

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

The [100] and [110] directions in a cubic crystal are coplanar with

A

[101]

B

[001]

C

[120]

D

[111]

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3

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

The atomic packing factor for the diamond cubic structure is

A

0.74

B

0.68

C

0.34

D

0.25

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4

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

Match each material in group I with a bond-type in group II.

Group-I	Group-II
(P) Silicon	(1) Metallic bonding
(Q) Copper	(2) Covalent bonding
(R) Sodium chloride	(3) Ionic bonding
	(4) Van der Waals bonding

A

P-2, Q-1, R-4

B

P-1, Q-3, R-1

C

P-4, Q-1, R-3

D

P-2, Q-1, R-3

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5

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

Nanoparticles derive some of their interesting properties due to the large value of \(f_s\), the fraction of surface atoms, compared to \(f_b\), the fraction of atoms in the bulk. The ratio (\(f_s/f_b\)) varies with the particle size, \(r\), as

A

\(r^{-3}\)

B

\(r^{-2}\)

C

\(r^{-1}\)

D

\(r^2\)

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6

2007 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2007

The lattice parameter of α-iron is

A

0.204 nm

B

0.287 nm

C

0.404 nm

D

0.574 nm

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7

2008 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2008

The ASTM grain size number of a material which shows 64 grains per square inch at a magnification of 200X is

A

5

B

6

C

7

D

8

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8

2008 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2008

The planar density for (111) plane in a fcc crystal is

A

0.68

B

0.74

C

0.85

D

0.91

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9

2008 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2008

Iridium has fcc structure. Its density and atomic weight are 22,400 kg m^-3 and 192.2, respectively. The atomic radius of iridium in nm is

A

0.126

B

0.136

C

0.146

D

0.156

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10

2008 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2008

The interplanar spacing in nm is

A

0.158

B

0.164

C

0.177

D

0.185

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11

2009 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2009

In an ideal HCP packing, the c/a ratio is

A

1.225

B

1.414

C

1.633

D

1.732

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12

2009 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2009

Superalloys are

A

Al-based alloys

B

Cu-based alloys

C

Ni-based alloys

D

Mg-based alloys

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13

2009 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2009

The interplanar spacing for (220) planes in copper is

A

0.064 nm

B

0.128 nm

C

0.181 nm

D

0.256 nm

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14

2010 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2010

The miller indices of the direction common to the planes (111) and (110) in a cubic system is

A

[111]

B

[110]

C

[1̄10]

D

[1̄11]

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15

2010 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2010

The third peak in the X-ray diffraction pattern of a polycrystalline BCC metal is

A

(111)

B

(110)

C

(211)

D

(220)

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16

2010 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2010

The theoretical density of an FCC metal with atomic radius and atomic weight of 0.144 nm and 197 g mol^-1, respectively, is approximately (in kg m^-3)

A

18110

B

18300

C

19360

D

19890

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17

2011 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2011

For a simple cubic unit cell with unit vectors i, j and k, the angle between lattice vectors [100] and [111] in degrees is

A

35.2

B

54.7

C

60

D

90

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18

2011 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2011

For a fcc unit cell, the ratio of the number of tetrahedral voids to the number of atoms is

A

2:1

B

3:1

C

4:1

D

5:1

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19

2011 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2011

For a cubic metal with lattice parameter of 3.92 Å, the first four diffraction peaks from the X-ray powder diffraction pattern taken with CuK_{\( \alpha \)} radiation (\( \lambda = 1.5405 \) Å) occur at 2\( \theta \) values of 39.7, 46.2, 67.5, and 81.3 degrees. The crystal structure of the metal is

A

simple cubic

B

fcc

C

bcc

D

diamond cubic

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20

2012 · Metallurgical Engineering · Materials Science and Non-Metallic Materials · Material Classification, Bonding and Structure

Metallurgical Engineering (MT) 2012

If d is the inter-planar spacing of the planes {h k l}, the inter-planar spacing of the planes {nh nk nl}, n being an integer, is

A

d

B

d/n

C

nd

D

d/n²

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