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Quiz 1
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Q.1
L
e
/D for 90° elbow (medium radius) and 90°square elbow would be respectively around
25 and 60
3 and 5
100 and 250
250 and 600
Q.2
In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
Zig-zag
Chain
Diamond
None of these
Q.3
The units of Young's modulus of elasticity and __________ are the same.
Strain
Stress
Modular ratio
None of these
Q.4
Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the
Flow rates of each fluid
Type and size of packing
Concentration of each fluid
All of the above
Q.5
Tube height in a calendria type evaporator is normally less than __________ metres.
1
2
3.5
5.5
Q.6
Hole diameter of the seive trays in the distillation column ranges from __________ mm.
L to 3
4 to 8
3 to 12.5
12.5 to 18.5
Q.7
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
Fixed charges initially
Running cost of cooling water for condenser
Vapour & liquid load both
Running cost of steam for reboiler
Q.8
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
Are easier to clean
Are less prone to fouling
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
None of these
Q.9
Liquid gradient over a tray can be minimised by
Providing a higher skirt clearance or a higher weir
Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must
Using split flow, radial flow or cascade flow for column diameter large than 4 ft
All of the above
Q.10
Needle valves are generally not used for
Very large diameter pipes
High pressure throttling service
Very accurate flow control
Smaller sizes of pipe
Q.11
Lug support is meant for supporting __________ vessels.
Large horizontal cylindrical
Tall but empty
Small
Thick walled tall
Q.12
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )
0.2 D
0.5 D
0.66 D
0.80 D
Q.13
Pick out the wrong statement about distillation operation
Distillation under vacuum is a substitute for steam distillation
In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation
In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other
Flash distillation, differential distillation & steam distillation are all continuous distillation processes
Q.14
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").
Half
Three fourth
Equal to
1.5 times
Q.15
Two iron pipes of the same nominal diameter but different schedule numbers will have the same
Inside diameter
Outside diameter
Wall thickness
None of these
Q.16
The distance between the centre of a rivet hole to the nearest edge of the plate is called
Pitch
Margin
Back pitch
None of these
Q.17
The LMTD correction factor (F
T
) is defined as the
Ratio of true temperature difference to the LMTD
Ratio of LMTD to the true temperature difference
Differenced of true temperature difference and the LMTD
Geometric mean of the true temperature difference and the LMTD
Q.18
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?
6.5 cms
6.5 mm
Equal to tube I.D
Equal to tube O.D
Q.19
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
1
8
80
180
Q.20
L
e
/D for fully open gate valves would be
Much more than that for fully open globe valves
Much less (say 2% than that for fully open globe valves)
Around 7
Both B and C
Q.21
Pick out the wrong statement about the design of seive plate column and the bubble cap column.
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir length for a bubble cap plate is the same as that for the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Q.22
__________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
Radial flow
Cross flow
Split flow
Cascade
Q.23
Bracket supports are the most suitable for supporting __________ vessels.
Thick walled vertical
Horizontal
Thin shperical (e.g. Horton sphere)
None of these
Q.24
Saddle supports are used for supporting __________ vessels.
Horizontal cylinderical
Tall vertical
Thick walled vertical
Thick spherical
Q.25
For laminar flow (N
Re
< 2100) in steel pipe, the optimum inside pipe diameter is given by
D
i, opt
= 3 Q
0.36
ρ
0.18
D
i, opt
= 3.9 Q
0.45
. ρ
0.23
D
i, opt
= 7.6 Q
0.36
. ρ
0.9
D
i, opt
= 3 Q
0.36
. ρ
1.86
μ
0.08
Q.26
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
2.5"
0.5"
5"
50% of the plate spacing
Q.27
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
The corrosive and fouling fluid should be preferably routed through the tubes
The viscous fluid should be routed through the shell side
Lower flow rate fluid should be routed through the shell side
Higher pressure fluid stream should be routed through the shell side
Q.28
Skirt support is the most suitable for supporting __________ vessels.
Small horizontal
Large horizontal
Tall vertical
Thick walled
Q.29
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
10
20
30
5
Q.30
Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.
20
30
45
85
Q.31
Pick out the wrong statement pertaining to a shell and tube heat exchanger.
The minimum value of baffle spacing is 50 mm
The maximum value of baffle spacing is equal to the I.D. of the shell
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
Disk and doughnut baffle is the most commonly used baffle
Q.32
Pick out the wrong statement pertaining to shell and tube heat exchanger.
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle
Baffles are supported independently of the tubes by tie rods and positioned by spacers
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
Q.33
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of
Preventing the local overstressing of the shell around the opening
Reduction of discontinuity in shape at the junction
Making the joint leak proof
None of these
Q.34
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
1000
3000
5000
10000
Q.35
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
Reducing scale deposition
Increasing pressure drop
Fixing the tubes
Creating turbulence
Q.36
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.)
Z.H.ρ/L
L/Z.H.ρ
H.ρ/L
Z.H/L.ρ
Q.37
The most common standard size of bubble caps used in industrial operation is
1" dia cap with 0.5" dia riser
6" dia cap with 4" dia riser
8" dia cap with 1" dia riser
4" dia cap with 8" dia riser
Q.38
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
pd/2t
pd/4t
pd/t
pd/3t
Q.39
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
pd/2t
pd/4t
pd/t
pd/8t
Q.40
The ratio of shear stress to shear strain is called
Bulk modulus
Shear modulus
Modulus of rigidity
Modulus of elasticity
Q.41
For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.
25
23
26
27
Q.42
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
Sensible heat changes for vapour & liquid are negligibly small
Reflux is not a saturated liquid
Molar latent heat of the two components are equal
Heat of mixing of normal liquid is assumed to be zero
Q.43
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
6% of I.D.
3 times the thickness
Either A or B, whichever is larger
Either A or B, whichever is smaller
Q.44
For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
1/D
1/D²
1/D⁵
D²
Q.45
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.L
e
/D.V
2
/2gc, where, L
e
= equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of L
e
/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around
5 and 10
45 and 75
180 and 300
300 and 500
Q.46
Filtration rate is affected by the
Pressure drop across the cake & filter medium
Cake & filter medium resistance
Area of filtering surface & the viscosity of filtrate
All of the above
Q.47
In distillation columns, bubble caps are held in place over trays by
Rivets
A hold down bar
Bolts
Both B and C
Q.48
Stage efficiency for packed tower varies with the
Type & size of packing
Fluid rates and fluid properties
Operating pressure and column diameter
All of the above
Q.49
It is not desirable to design a heat exchanger for LMTD correction factor, F
T
, of less than
0.99
0.95
0.80
0.55
Q.50
In case of design of a shell and tube heat exchanger,
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
All of the above
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