This set of Distillation Design Multiple Choice Questions & Answers (MCQs) focuses on “Common Tray Types”.
1. Bubble cap is a perforated tray with, additional
a) Trays
b) Camps
c) Pooches
d) Holes
View Answer
Explanation: Bubble cap are provided with trays and valve trays are the most popular type of trays assembled.
2. Sieve tray after installation gives, a Vapor
a) Bypass effect
b) Valve effect
c) Multiorifice effect
d) Manhole effect
View Answer
Explanation: The sieve tray gives a multi orifice effect to stop the process called weeping and liquid hold up.
3. An example of zero down comers is?
a) Dual tray
b) Sieve tray
c) Cap tray
d) Bubble tray
View Answer
Explanation: A dual flow tray is a sieve tray with no down comers. This tray operates with liquid continuously.
4. Continuous flow of liquid causes?
a) Greater efficiency
b) Lesser efficiency
c) Affordable cost
d) Extra cost
View Answer
Explanation: When the liquid flow continuously weeping through holes then the efficiency gets lesser and greater the problems.
5. In the packed column, the fluid flows from
a) Top to bottom
b) Bottom to top
c) Left to right
d) Right to left
View Answer
Explanation: In pure column based equipment the fluid flows from top to bottom, gas flows from bottom and liquid from the top.
6. Stages are also called?
a) Trays
b) Cascades
c) Flow regime
d) Initial plate
View Answer
Explanation: The stages are also called as cascade, upper and tower are also called cascade, Disturbance’s in the flow is called as flow regimes.
7. The tray holds up a dispersion of?
a) Solid-liquid
b) Gas -gas
c) Gas-liquid
d) Liquid-liquid
View Answer
Explanation: It allows the gas to flow through the holes or passages the gas bubbles vigorously and form a gas-liquid dispersion.
8. The open region provides between the tray floor and cap bottom is called as?
a) Pocket clearance
b) Skirt clearance
c) Tray clearance
d) Carp clearance
View Answer
Explanation: The ball shaped cap rests on the three short legs and placed at 1200 this is called as skirt clearance.
9. The sieve tray is also called as?
a) Perforated tray
b) Non porous tray
c) Porous tray
d) Clear tray
View Answer
Explanation: As the small holes are made by punching holes into the tray these are called perforations and thus the tray is called perforated tray.
10. If the tower hole area is 366 m2 and the tower cross section is 10 m2, the free area fraction is?
a) 785 m2
b) 366.56 m2
c) 36.6 m2
d) 3660 m2
View Answer
Explanation: As free area = (hole area/tower CSA) = 366/10 = 36.6 m2.
Sanfoundry Global Education & Learning Series – Distillation Design.
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