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Quiz 4
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Q.1
In perforated plate towers, the
Hole sizes may be around 1/8" or 3/16"
Total hole area may be around 6 to 15% of tower cross-sectional area
Pressure drop is less compared is similar bubble cap towers
All of the above
Q.2
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
Is economical in operation
Employs high velocity, high heat transfer rate and less heating surface requirement
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Both B & C
Q.3
The ratio of lateral strain to linear strain is termed as the
Poisson's ratio
Bulk modulus
Modulus of elasticity
Shear modulus
Q.4
__________ liquor is best handled in a long tube vertical evaporator.
Foamy
Scaling
Viscous
Salting
Q.5
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.
Tube dia is 3-6 cms, while tube length in 3-6 metres
Steam is fed to the shell, whereas the liquor is filled inside the tube
Liquor level is maintained at l/3
rd
to 1/2 of the height of the tube
None of these
Q.6
Oxygen carrying pipelines in chemical industries are coloured with __________ colour.
Yellow
Black
Blue
Red
Q.7
Lug support is
The most suitable for thick vertical vessel
Same as bracket support
Provided usually for vessels of much smaller height than skirt supported vessels
All of the above
Q.8
25 per cent cut segmental baffle means that the baffle
Height is 75% of the I.D. of the shell
Height is 25% of the I.D. of the shell
Spacing is 75% of its height
Width is 25% of its height
Q.9
Vertical vessels are not supported by
Brackets
Skirts
Columns
Saddles
Q.10
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.
Flat plate
Hemispherical
Torispherical
Ellipsoidal
Q.11
The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
1
< 1
>1
Equal to the order of reaction
Q.12
Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
Ultimate stress to breaking stress
Ultimate stress to working stress
Working stress to ultimate stress
None of these
Q.13
The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.
6
12
18
34
Q.14
Optimum economic pipe diameter for fluid flow is determined by the
Viscosity of the fluid
Density of the fluid
Total cost considerations (pumping cost plus fixed cost of the pipe)
None of these
Q.15
__________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.
Sieve plate
Packed
Bubble cap plate
None of these
Q.16
Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.
0.1 to 2
5 to 7
3 to 8
8 to 15
Q.17
Weep holes provided in the plates of a distillation column
Facilitate draining out liquid from a tray when the unit is not in operation
Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
All of the above
Q.18
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the
Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable
Liquid/vapor loading across the column remains constant
All of the above
Q.19
With increase in gas flow rate to fabric surface area ratio (Nm³/hr/m² fabric surface area), the size & the cost of a bag filter
Increases
Decreases
Remain unaffected
None of these
Q.20
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
Q.21
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
Q.22
The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.
6
18
24
34
Q.23
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the
Central dished section and corner torus section
Corner torus section and central dished section
Central dished section and straight flange section
Straight flange section and corner torus section
Q.24
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σ
L
and the circumferential stress, σ
h
are related by
σ
h
= 2 σ
L
σ
h
= σ
L
σ
h
= σ
L
/2
No relation exists
Q.25
A binary liquid azeotropic mixture has boiling point higher than either of the components, when it shows __________ deviation from Raoult's Law.
Positive
Negative
No
None of these
Q.26
The dust collection efficiency of electrostatic precipitator increases with increase in the
Gas flow rate
Electrode area
Both A & B
Neither A nor B
Q.27
A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is
Bending
Deformation
Shear
Elongation
Q.28
The normal range of velocity of water in pipes is __________ m/sec.
0.1-0.5
1-2
10-50
15-30
Q.29
To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to
0.5 d
D
1.5 d
2.5 d
Q.30
The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.
Equal to
Half
One fourth
Three fourth
Q.31
A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law.
Positive
Negative
No
None of these
Q.32
Vapor velocity in a distillation column for non-foaming mixture is in the range of __________ times the flooding velocity.
0.1 to 0.3
0.6 to 0.7
0.85 to 0.95
1.5 to 2
Q.33
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
Equal to
More than
Less than
Either B or C; depends on maximum permissible internal pressure
Q.34
If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of
D/2 or minimum 2" to 5D
D/5 or minimum 2" to 5D
D/5 or minimum 2" to D
None of these
Q.35
The minimum baffle height should be
Equal to the impeller diameter
Twice the impeller diameter
Twice the tank diameter
3/4 of the tank height
Q.36
For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?
Hemispherical
Ellipsoidal (2 : 1)
Conical
Flat plate
Q.37
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
Q.38
__________ shaped roof is most commonly used for cylindrical tanks.
Cone
Dome
Umbrella
Flat
Q.39
The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
Disk and ring
Segmental
Orifice
Independent of the type of
Q.40
Removable connection of tubes to tube sheet is called
Ferrule
Socket
Nipple
Saddle
Q.41
An underdesigned steam trap will
Waste steam
Destroy itself of acceleration wear due to rapid recycling
Back up condensate and cause water hammer in steam line
None of these
Q.42
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
Same as that for fluid flow
Less than that for fluid flow
More than that for fluid flow
D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)
Q.43
The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)
0.5 d
0.75 d
D
2 d
Q.44
The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability.
2
5
10
15
Q.45
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as
D = 1.1 t
D = 1.6 √t
D = 1.5 t
D = 3√t
Q.46
Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
1.25
1.75
2.5
3.5
Q.47
Brass valves are usually made for pipe sizes __________ inches.
?1
?2
>2.5
>3.5
Q.48
Movement of pipeline caused by thermal expansion is taken care by providing
Expansion joint
Changes in its direction
Change in the shape of pipeline
All of the above
Q.49
What is the slope of the operating line in the stripping section of a distillation column?
0
?
> 1
< 1
Q.50
In shell and tube heat exchangers, straight tie rods are used to
Hold baffle in space
Fix the tubes in position
Account for thermal strain
None of these
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