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Chemical Engineering
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Mass Transfer
Comments
Question
As the reflux ratio in a distillation coloumn is increased from the minimum, the
Options
A. slope of the operating line in stripping section decreases.
B. number of plates decreases very slowly first and then more and more rapidly.
C. total cost first decreases and then increases.
D. liquid flow increases while the vapor flow decreases for a system.
Correct Answer
total cost first decreases and then increases.
Mass Transfer problems
Search Results
1. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
Options
A. natural draft cooling tower
B. induced draft cooling tower
C. spray chamber
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: spray chamber
2. Which of the following unit operations makes use of Thiele-Geddes equation?
Options
A. Liquid-liquid extraction
B. Solid-liquid extraction
C. Multicomponent absorption with chemical reaction
D. Multicomponent distillation.
Show Answer
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Discuss
Correct Answer: Multicomponent distillation.
3. Overall efficiency of the distillation column is
Options
A. the ratio of number of ideal plates to actual plates.
B. the ratio of number of actual plates to ideal plates.
C. same as the Murphree efficiency.
D. always more than the point efficiency.
Show Answer
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Discuss
Correct Answer: the ratio of number of ideal plates to actual plates.
4. In batch distillation with constant reflux, overhead product composition __________ with time.
Options
A. increases
B. decreases
C. does not vary
D. may increase on decrease, depends on the system.
Show Answer
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Discuss
Correct Answer: decreases
5. With increase in pressure, the relative volatility for a binary system
Options
A. increases.
B. decreases.
C. remains same.
D. either (a) or (b), depends on the system.
Show Answer
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Discuss
Correct Answer: decreases.
6. Total reflux in a distillation operation requires minimum
Options
A. reboiler load
B. number of plates
C. condenser load
D. all (a), (b) and (c)
Show Answer
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Discuss
Correct Answer: number of plates
7. Which of the following remains constant during sensible cooling process?
Options
A. Specific humidity
B. Partial pressure of vapour
C. Both (a) and (b)
D. Neither (a) nor (b)
Show Answer
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Correct Answer: Both (a) and (b)
8. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Options
A. higher dew point.
B. higher absolute (specific) humidity.
C. higher relative humidity
D. higher wet bulb temperature.
Show Answer
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Correct Answer: higher relative humidity
9. Dew point of a gas-vapour mixture
Options
A. increases with temperature rise.
B. decreases with temperature rise.
C. decreases with decrease in pressure.
D. increases with increase in pressure.
Show Answer
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Discuss
Correct Answer: decreases with decrease in pressure.
10. To increase the absorption factor, (where,
G
= gas flow rate,
S
= solvent flow rate)
Options
A. increase both '
G
' and '
S
'.
B. decrease both '
G
' and '
S
'.
C. increase '
S
' and decrease '
G
'.
D. increase '
G
' and decrease '
S
'
Show Answer
Scratch Pad
Discuss
Correct Answer: increase '
S
' and decrease '
G
'.
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