Mechanical Engineering - Engineering Materials

6. 

In a face centred cubic space lattice, there are

A. nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
B. fourteen atoms out of which eight atoms are located at the corners of the cube and six atoms at the centres of six faces
C. seventeen atoms out of which twelve atoms are located at the twelve corners of the hexagonal prism, one atom at the centre of each of the two hexagonal faces and three atoms are symmetrically arranged in the body of the cell
D. none of the above

Answer: Option B

Explanation:

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7. 

The fuel used in a blast furnace is

A. coal
B. coke
C. wood
D. producer gas

Answer: Option B

Explanation:

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8. 

Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.

A. True
B. False

Answer: Option A

Explanation:

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9. 

Which of the following is a point imperfection?

A. Vacancy
B. Interstitial imperfection
C. Frenkel imperfection
D. all of these

Answer: Option D

Explanation:

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10. 

The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as

A. carburising
B. cyaniding
C. flame hardening
D. induction hardening

Answer: Option B

Explanation:

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