Chemical Engineering

Question: In sulphate pulp manufacture, the pressure and temperature in the digestor is
[A].

10 atm., 800 °C

[B].

10 atm., 170-180°C

[C].

1 atm., 170 – 180°C

[D].

l atm., 800°C

Answer: Option B

Explanation:

No answer description available for this question.

Question: Digestion of wood-base materials (for manufacture of pulp) is done to
[A].

remove lignin.

[B].

produce long fibres.

[C].

prevent deterioration on storage.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Aryl benzene sulphonate (ABS) is a
[A].

detergent.

[B].

plasticiser for unsaturated polyester.

[C].

starting material for the synthesis of glycerine.

[D].

coating ingredient for photographic film.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fluorescent dyes are added in detergents to
[A].

act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics.

[B].

attain distinctiveness from other brands.

[C].

act as tarnish inhibitor for metals like German silver.

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Hydrophilic group of a soap or detergent solution is
[A].

water hating

[B].

soil loving

[C].

water loving

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Carboxymethyl cellulose (CMC) is added in detergents to
[A].

prevent redeposition of soil on cleaned surface.

[B].

act as optical brightening agent.

[C].

inhibit corrosion in washing machines made of aluminium,

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Glycerine is not used in the
[A].

manufacture of explosive.

[B].

conditioning and humidification of tobacco.

[C].

manufacture of pharmaceuticals.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Glycerine is recovered from lye by
[A].

evaporation followed by vacuum distillation.

[B].

liquid extraction technique.

[C].

extractive distillation technique.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Hydrogenation of oil takes place in a/an __________ reactor.
[A].

autothermal

[B].

trickle bed

[C].

plug flow

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils
[A].

cause cholesterol build up and blood clotting.

[B].

are prone to rancid oxidation.

[C].

always contain some amount of nickel (as their complete removal is very difficult).

[D].

have affinity to retain harmful sulphur compounds.

Answer: Option A

Explanation:

No answer description available for this question.