Chemical Engineering - Chemical Engineering Basics

26. 

Wood is a/an __________ material.

A. amorphous
B. cellular
C. homogeneous
D. grannular

Answer: Option B

Explanation:

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27. 

Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties.
B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness.
C. Induction hardening and flame hardening techniques are also used for surface hardening.
D. Martempering of a material is a hardening process.

Answer: Option C

Explanation:

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28. 

Use of flux during soldering is done to

A. increase flidity of solder by lowering its melting temperature.
B. prevent oxide formation.
C. wash away surplus solder.
D. full up the joint gap.

Answer: Option B

Explanation:

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29. 

The most important consideration in value engineering is the

A. profit maximisation.
B. customer satisfaction.
C. cost reduction.
D. process improvement.

Answer: Option B

Explanation:

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30. 

Resilience of a bolt can be increased by increasing its

A. length
B. shank diameter
C. head diameter
D. none of these

Answer: Option A

Explanation:

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