Chemical Engineering - Chemical Engineering Basics

36. 

Which of the following is not a principal alloying element for the structural steel?

A. Molybednum
B. Nickel
C. Manganese
D. Chromium

Answer: Option A

Explanation:

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37. 

Metalloids

A. are good conductor of heat & electricity.
B. act as electron donors with metals & as electron acceptor with non-metals.
C. are not necessarily solids at room temperature.
D. are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron.

Answer: Option D

Explanation:

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38. 

Pick out the wrong statement

A. Processing of themosetting plastics is ideally done by injection moulding.
B. Processing of thermoplastics is ideally done by compression moulding.
C. Mass production of seamless pipes are done by electrical resistance welding (ERW).
D. Stretch forming is a process of cold drawing.

Answer: Option C

Explanation:

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39. 

Lead is poured into the joints between two __________ pipes.

A. cast iron
B. steel
C. concrete
D. plastic

Answer: Option A

Explanation:

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40. 

'Ice point' is designated on Farenhite temperature scale by

A.
B. 32°
C. 62°
D. 212°

Answer: Option B

Explanation:

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