Chemical Engineering - Mass Transfer

41. 

__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

A. Packed
B. Bubble
C. Spray
D. Tray

Answer: Option B

Explanation:

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42. 

The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for

A. recovery of tannis from the tree barks and woods.
B. leaching sodium nitrate from Chilean nitrate bearing rock.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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43. 

Penetration model (theory) for mass transfer was enunciated by

A. Danckwerts
B. Toor and Marchello
C. Higbie
D. Kissinevskii

Answer: Option C

Explanation:

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44. 

Surface renewal model of mass transfer was enunciated by

A. Toor and Marchello
B. Fick
C. Danckwerts
D. Stefan

Answer: Option C

Explanation:

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45. 

When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

A. temperature rises
B. pressure rises
C. temperature falls
D. pressure falls

Answer: Option A

Explanation:

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