This set of Manufacturing Engineering Interview Questions and Answers focuses on “Crystallography-2”.

1. Coordination number of simple cubic unit cell is equal to

a) 4

b) 6

c) 8

d) 2

View Answer

Explanation: Six atoms are nearest to simple cubic cell. Coordination number is the number of atom adjacent to one atom.

2. Coordination number of face centered cubic unit cell is equal to

a) 4

b) 6

c) 8

d) 12

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Explanation: Twelve atoms are nearest to face centered cubic cell. Coordination number is the number of atom adjacent to one atom.

3. Coordination number of body centered cubic unit cell is equal to

a) 4

b) 6

c) 8

d) 2

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Explanation: Two atoms are nearest to body centered cubic cell. Coordination number is the number of atom adjacent to one atom.

4. Effective number of atom in simple cubic unit cell is equal to

a) 4

b) 1

c) 8

d) 2

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Explanation: 8× 8⁄8=1 and total number of atoms at corners= 8. Each corner atom is shared by total 8 unit cells.

5. Effective number of atom in face centered unit cell is equal to

a) 4

b) 1

c) 8

d) 2

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Explanation: 8× 1⁄8+6×1⁄2=1 and total number of atoms at corners= 8, total atoms at faces= 6.Each corner atom is shared by total 8 unit cells.

6. Effective number of atom in body centered cubic unit cell is equal to

a) 4

b) 1

c) 8

d) 2

View Answer

Explanation: 8× 8⁄8+1=1 and total number of atoms at corners= 8, number of atoms at body centre=1.Each corner atom is shared by total 8 unit cells.

7. Atomic Packing fraction in percentage of simple cubic structure is given by

a) 74

b) 52

c) 68

d) 66

View Answer

Explanation: a=r and APF= (volume of effective number of atoms/volume of unit cell).

8. Atomic Packing fraction in percentage of body centered structure is equal to

a) 74

b) 52

c) 68

d) 66

View Answer

Explanation: r=(√3)/4×a and APF= (volume of effective number of atoms/volume of unit cell).

9. If radius of copper is 1.27 Aͦ, then density of copper in Kg⁄m^3 will be

a) 100.01

b) 86.25

c) 8979

d) 7968

View Answer

Explanation: Copper have Face centered cubic structure and atomic weight 63.5.

10. Atomic Packing fraction in percentage of face centered cubic structure is equal to

a) 74

b) 52

c) 68

d) 66

View Answer

Explanation: a=2√2×r and APF= (volume of effective number of atoms/volume of unit cell).

**Sanfoundry Global Education & Learning Series – Manufacturing Engineering.**

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