Chemical Engineering - Chemical Process

31. 

Use of hydrated lime in water treatment

A. before filtration, reduces the bacterial load on filters.
B. after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
C. is to adjust the pH value.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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32. 

Higher vicosity index of a lubricating oil denotes

A. less changes in fluidity of oil with temperature.
B. substantially high change in fluidity of oil with temperature.
C. its unsuitability under varying temperature conditions .
D. none of these.

Answer: Option A

Explanation:

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33. 

Le-Blanc process is a primitive process for the manufacture of

A. caustic soda
B. soda ash
C. bromine from sea water
D. hydrochloric acid

Answer: Option B

Explanation:

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34. 

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

A. 500°C
B. 750°C
C. 1000°C
D. 1500°C

Answer: Option C

Explanation:

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35. 

Cement setting under water employs a/an __________ process.

A. hydration
B. decomposition
C. oxidation
D. reduction

Answer: Option A

Explanation:

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