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Quiz 2
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Q.1
In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around
0.5
1.5
2.5
3.5
Q.2
Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to
G
0.2
G
0.5
G
0.8
G
1.5
Q.3
Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder
Has greater structural strength
Is easy to fabricate
Both A & B
Neither A nor B
Q.4
Seamless pipe is made
From rolled strips formed into cylinders and seam-welded
By extrusion & casting into static and centrifugal molds
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing
Both B and C
Q.5
__________ strain is measured using a 'strain rosetter'.
Volumetric
Shear
Linear
None of these
Q.6
In case of a continuous distillation column, increase in reflux ratio may result in the
Lower fixed charges for the column
Greater cost for the reboiler heat supply
Greater cost for the condenser coolant
All of the above
Q.7
Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as
Δp = G
Δp = G
0.5
Δp = G
2
Δp = 1/G
0.6
Q.8
Column support for the roof of cylindrical storage tank must be provided for
Small diameter tanks
Large diameter tanks
Small diameter tall tanks
All of the above
Q.9
Generally, elliptical dished heads
Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
All of the above
Q.10
Pick out the correct statement
Centre to centre distance between two consecutives rivets in a row is called the pitch
A rivetted joint made in overlapping plates is called butt joint
Hole size drilled in rivetted plates is less than the actual size of the rivet
None of these
Q.11
Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is
pD/2t
pD/4t
pD/3t
pD/6t
Q.12
With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, F
T
Decreases very rapidly
Increases very rapidly
Remains constant
Increases linearly
Q.13
Hold up of material in a operating rotary drier is in the range of
0.05 to 0.15
0.25 to 0.50
0.5 to 0.8
0.8 to 0.9
Q.14
In a shell and tube heat exchanger, the clearance of the tube is generally
Not less than one-fourth of the tube diameter or 3/16"
More than the tube diameter
Equal to the tube diameter
More in case of triangular pitch as compared to the square pitch tube layout
Q.15
Speed of industrial paddle agitator ranges from __________ rpm.
1 to 5
20 to 100
500 to 750
1000 to 2000
Q.16
Which of the following lengths of heat exchanger tubes are normally not used in practice?
2.5 metres
6 metres
10 metres
0.5 metre
Q.17
Pick out the wrong statement:
The tensile strength of a brittle material is less than its compressive strength
The compressive strength of a ductile materia] is less than its tensile strength
In a thick cylindrical shell, the hoop stress is maximum at the inner radius
The value of crushing load is more than that of buckling load for long colmns
Q.18
Vertical storage vessels are never supported by __________ support.
Bracket
Saddle
Skirt
Lug
Q.19
Which of the following material is seldom used for pressure vessel construction?
Rimmed still
Mild steel
Killed steel
Semi-killed steel
Q.20
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by
4(0.86p² - πd²/4)/πd
(p² - πd²/4)/πd
4(0.86p² - πd²)/πd
(4p² - πd²/4)/πd
Q.21
Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid
Containing suspended solids flows at low velocity
Containing suspended solids flows at high velocity
Is highly viscous
Is of high specific gravity
Q.22
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is
D
1
/(d
1
+ d
2
)
D
2
/(d
1
+ d
2
)
(d
1
+ d
2
)/d
1
(d
1
+ d
2
)/d
2
Q.23
Height of the flights in the rotary drier is in the range of
0.08 to 0.12 d
0.02 to 0.05 d
0.2 to 0.5 d
0.5 to 0.6 d
Q.24
The value of fouling factor depends upon the
Characteristic of process fluid
Velocity of process fluid containing suspended solids
Suspended solids in the fluid
All of the above
Q.25
The operating pressure drop range in a bag filter is about __________ mm water gauge.
50-150
5-10
500-1500
1500-2500
Q.26
Cylindrical pressure vessels in horizontal condition is generally supported on a __________ support.
Lug
Skirt
Saddle
Guy wire
Q.27
__________ closure is the weakest enclosure for cylindrical vessels.
Hemispherical
Torispherical
Conical or flat plate
Elliptical
Q.28
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5
th
the I.D. of the shell. Which of the following is not a function of the baffles?
To increase the residence time of shell side fluid
To provide support to the tube bundle
To reduce the induced vibration in the tubes
To increase the tube side heat transfer co-efficient by inducing turbulence
Q.29
Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?
Size, shape, orientation and surface of the packing particles
Density and viscosity of fluids
Fluid flow rates
All of the above
Q.30
Which of the following is used to set the diameter of the distillation column?
Number of theorectical plates
Static submergence
Allowable vapour velocity
Length of straight rectangular weir on cross-flow tray
Q.31
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
Equal sized reactors are the best
Smaller reactor should come first
Larger reactor should come first
None of these
Q.32
1.2 to 3.8 cms is the value of the
Downcomer liquid seal in case of a balanced tray design
Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.)
Skirt clearance for bubble caps
All of the above
Q.33
For high pressure process equipments/vessels, the connected nozzle should be
Welded
Screwed
Flanged
Brazed
Q.34
For turbine agitator, the impeller diameter is about
0.3 to 0.5 d
0.1 to 0.2 d
0.65 to 0.85 d
0.95 d
Q.35
In a thin cylindrical shell, the hoop stress is __________ stress.
Radial
Circumferential tensile
Compressive
Longitudinal
Q.36
Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is
More
Less
Same
Cither A or B; depends upon the I.D. of the pipe
Q.37
Larger depth of liquid on the trays of a distillation column
Leads to high tray efficiency
Results in higher pressure drop per tray
Both A & B
Neither A nor B
Q.38
In a shell and tube heat exchanger, the 'tube pitch' is defined as the
O.D. of the tube for square pitch
Shortest distance between two adj acent tube holes
Shortest centre to centre distance between adjacent tubes
None of these
Q.39
Spherical shaped pressure vessel is considered to be the most ideal, because it can
Withstand higher pressure for a given metallic shell thickness
Be fabricated very easily
Be designed without wind load considerations
Be supported very easily
Q.40
Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column
Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hen
Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm²
Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm²
Q.41
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
Sorel-Lewis method
McCabe-Thiele's method
Ponchon-Savarit method
None of these
Q.42
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap
Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features
Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range
Q.43
In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as
0.1
0.8
0.25
0.5
Q.44
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 n
th
1.5 n
th
Q.45
L
e
/D for fully open globe value may be around
10
25
75
300
Q.46
In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.
2-3
5-8
10-15
20-25
Q.47
__________ shapedroof is the most commonly used roof for cylinderical storage tanks.
Conical
Flat
Dome
Umbrella
Q.48
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from
1.5-2.5
3.5-5.5
7.5-10.0
10-15
Q.49
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
5-10
15-20
30-35
35-40
Q.50
The raio, (properller agitator dia/tank dia) is normally taken as
0.15-030
0.5-0.65
0.75-0.85
0.60-0.90
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