Question is ⇒ In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the, Options are ⇒ (A) liquid gradient on the tray., (B) lower skirt clearance., (C) lower static submergence., (D) small downcomer liquid seal., (E) , Leave your comments or Download question paper.

Question is ⇒ In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the, Options are ⇒ (A) liquid gradient on the tray., (B) lower skirt clearance., (C) lower static submergence., (D) small downcomer liquid seal., (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
A.	liquid gradient on the tray. [Correct Answer]
B.	lower skirt clearance. [Wrong Answer]
C.	lower static submergence. [Wrong Answer]
D.	small downcomer liquid seal. [Wrong Answer]
View Answer 3 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The absorption factor is defined as (where, S₁ = slope of the equilibrium curve, S₂ = slope of the operating line)
S₁/S₂
S₁.S₂
S₂/S₁
1/S₁.S₂

⇒ Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be
d
d
2πd
2d

⇒ Welded joint efficiency in the design of chemical process equipment is taken as
0.55
0.75
0.85
0.95

⇒ Bracket supports are the most suitable for supporting __________ vessels.
thick walled vertical
horizontal
thin shperical (e.g. Horton sphere)
none of these

⇒ In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
liquid gradient on the tray.
lower skirt clearance.
lower static submergence.
small downcomer liquid seal.

⇒ In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.
1.2
0.5
3.8
6.8

⇒ Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
less
more
same
either (a) or (b); no generalisation can be made

⇒ A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
45
60
80
95

⇒ Nominal size of a pipe is an indication of its __________ diameter.
inner
outer
approximate
none of these

⇒ __________ liquor is best handled in a long tube vertical evaporator.
Foamy
Scaling
Viscous
Salting

⇒ Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes.

⇒ A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
19
38
76
95

⇒ Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
more
less
same
more or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein.

⇒ Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.
1 to 5
10 to 20
30 to 40
40 to 50

⇒ Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger
permits the use of less tubes in a given shell diameter.
facilitates comparatively easier external cleaning because of large clearance.
permits the use of more tubes in a given shell diameter.
both (b) and (c).

⇒ In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.
chain
diamond
zig-zag
none of these

⇒ Bubble cap plate column is
a finite stage contactor.
used only for distillation, not for absorption.
a differential stage contactor.
a continuous contactor.

⇒ Power required for agitation depends upon the
height & properties of the liquid.
agitator type & speed of agitation.
size of agitator & the tank.
all (a), (b) and (c).

⇒ Pick out the correct statement.
When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower.
Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty.
none of these.

⇒ Pick out the wrong statement
For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel.
Fouling factor of river water is less than that of sea water.
Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor.
both (b) and (c).

⇒ Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m².°C.
1250
2500
7500
15000

⇒ Pick out the wrong statement.
Rivetting provides a permanent fastening method.
The joint made by overlapping of one plate over the other, and then rivetting the two plates together with two rows of rivets is called 'double rivetted butt joint'.
Shank diameter of the rivets should be less than the size of the hole drilled in the plate for rivetting.
The efficiency of a rivetted joint is the ratio of the strength of the rivetted joint to the strength of the solid plate.

⇒ At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.
higher
lower
same
unpredictable

⇒ __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
Radial flow
Cross flow
Split flow
Cascade

⇒ In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
n'th
(1/n)th
0.5 nth
1.5 nth

⇒ Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing
rupture diaphragm
dikes
surge chamber
none of these

⇒ A cylinderical pressure vessel of volume 6 πm³ has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm² and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to
5 mm
6 mm
8 mm
10 mm

⇒ A cylindrical storage tank can have a self supported conical roof,
if its diameter is less than 15-20metres.
if its diameter is more than 50 meters.
if the thickness of the roof is more than that of the cylindrical shell.
irrespective of its diameter.

⇒ The ratio of linear stress to linear strain is termed as the
modulus of elasticity
modulus of rigidity
bulk modulus
none of these

⇒ The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.
6
18
24
34