Chemical Engineering - Mass Transfer

36. 

Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

A. at < 100
B. at > 210.6
C. between 100 and 210
D. none of these

Answer: Option A

Explanation:

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37. 

Pick out the wrong statement.

A. With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V ratio.
B. The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction.
C. Natural draft cooling towers are made of ferro-concrete and its cross-section is wider at the bottom.
D. Vanderwall adsorption is also called chemisorption.

Answer: Option D

Explanation:

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38. 

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?

A. 0
B. 1
C.
D. < 1

Answer: Option C

Explanation:

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39. 

Batch tray dryers suffers from the disadvantage of

A. high maintenance cost.
B. non-uniform & low production rate.
C. high labour cost & low heat economy.
D. all 'a', 'b' & 'c'.

Answer: Option C

Explanation:

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40. 

In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

A. > 4 :1
B. < 8 : 1
C. > 8:1
D. < 6:1

Answer: Option C

Explanation:

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