Mechanical Engineering - Engineering Materials

26. 

An aluminium alloy with 11% silicon is used for making engine pistons by die casting technique.

A. Yes
B. No

Answer: Option A

Explanation:

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27. 

Which of the following is an amorphous material?

A. Mica
B. Silver
C. Lead
D. Glass

Answer: Option D

Explanation:

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28. 

The machinability of steel is improved by adding

A. nickel
B. chromium
C. nickel and chromium
D. sulphur, lead and phosphorus

Answer: Option D

Explanation:

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29. 

The carbon in the pig iron varies from

A. 0.1 to 0.5%
B. 0.5 to 1%
C. 1 to 5%
D. 5 to 10%

Answer: Option C

Explanation:

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30. 

The type of space lattice found in alpha-iron is

A. face centred cubic space lattice
B. body centred cubic space lattice
C. close packed hexagonal space lattice
D. none of these

Answer: Option B

Explanation:

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