Mechanical Engineering - Engineering Materials

16. 

The high speed steel has __________ percentage of tungsten.

A. maximum
B. minimum

Answer: Option A

Explanation:

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17. 

The essential constituent of a hardened steel is

A. pearlite
B. austenite
C. martensite
D. troostite

Answer: Option C

Explanation:

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18. 

The cutting tools are made from

A. nickel steel
B. chrome steel
C. nickel-chrome steel
D. high speed steel

Answer: Option D

Explanation:

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19. 

The maximum solubility of carbon in austenite is 1.7% at 1130° C.

A. Yes
B. No

Answer: Option A

Explanation:

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20. 

In a close packed hexagonal 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. twelve atoms, all of which are located at the twelve corners of a hexagonal prism
C. fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces
D. none of the above

Answer: Option D

Explanation:

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