Chemical Engineering - Chemical Engineering Basics

31. 

The noble metals

A. are exemplified by Na, K and Li.
B. do not resist corrosion very strongly.
C. are the lowermost in the electro-chemical series of metals.
D. none of these.

Answer: Option C

Explanation:

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32. 

Which of the following is an example of cathodic protection of metals against corrosion ?

A. Painted steel
B. Galvanised iron
C. Case hardened steel
D. Lead lined reactor

Answer: Option B

Explanation:

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33. 

Thermal efficiency of an internal combustion engine is around __________ percent.

A. 8
B. 35
C. 65
D. 80

Answer: Option B

Explanation:

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34. 

Pick out the correct combination about the role of various additives used in polymers.

A. Plasticiser : increases the polymer strength.
B. Heat stabiliser : increases the maximum service temperature.
C. Fillers: Does not affect the property of polymer but increases its weight.
D. Lubricants: increases the flexibility of polymers.

Answer: Option C

Explanation:

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35. 

The lightest non-inflammable gas is

A. H2
B. He
C. Ar
D. O2

Answer: Option B

Explanation:

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