(2) Process Equipment and Plant Design I

Question 1

Fresh water carrying pipelines in chemical industries are coloured with __________ color.
sea green
brown
yellow
red

Answer 1

sea green

Question 2

Which of the following material is seldom used for pressure vessel construction ?
Rimmed steel
Mild steel
Killed steel
Semi-killed steel

Answer 2

Rimmed steel

Question 3

The ratio of shear stress to shear strain is called
-bulk modulus
-shear modulus
-modulus of rigidity
-modulus of elasticity

Answer 3

-shear modulus

Question 4

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.

Answer 4

-height is 75% of the I.D. of the shell.

Question 5

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

Answer 5

45

Question 6

Le/D for fully open globe value may be around
-10
-25
-75
-300

Answer 6

300

Question 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 (a), (b) and (c).

Answer 7

-all (a), (b) and (c).

Question 8

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.

Answer 8

-Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.

Question 9

With increase in the number of shell passes, the value of FT
-increases
-decreases
-remains same
-remains same, only if the number of tube passes does not change.

Answer 9

-increases

Question 10

Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.
1.5 to 2
2.5 to 5
5 to 10
10 to 15

Answer 10

2.5 to 5

Question 11

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.
3-5
5-11
8-15
12-18

Answer 11

5-11

Question 12

The stress developed in a material without any permanent set is called the
-ultimate stress
-yield stress
-elastic limit
-breaking stress

Answer 12

-elastic limit

Question 13

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.

Answer 13

-shortest centre to centre distance between adjacent tubes.

Question 14

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.

Answer 14

-Reflux is not a saturated liquid.

Question 15

Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)
-η = 17 - 61.1 log μ
- n = 24.6 P/μ
-η = 1.66 - 0.25 log μ
-η = 0.25 log μ - 1.67

Answer 15

-η = 17 - 61.1 log μ

Question 16

In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.
10
20
30
35

Answer 16

10

Question 17

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.
2
1/2
4
8

Answer 17

8

Question 18

To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of
(1.2)^3/2
(1.2)^3/5
(1.2)^2/3
(1.2)^5/3

Answer 18

(1.2)^5/3

Question 19

In a heat exchanger, shell side fluid velocity can be changed by changing the tube
-layout
-pitch
-both (a) & (b)
-neither (a) nor (b)

Answer 19

-both (a) & (b)

Question 20

Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?
-At the inner surface.
-At the mid thickness of the cylindrical wall.
-At the outer surface.
-None of these.

Answer 20

-At the inner surface.

Question 21

It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than
0.99
0.95
0.80
0.55

Answer 21

0.80

Question 22

A rivetted joint does not fail by __________ of rivets.
tearing
shearing
tearing of the plate across a row
none of these

Answer 22

none of these

Question 23

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).

Answer 23

-permits the use of more tubes in a given shell diameter.

Question 24

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

Answer 24

-thick walled vertical

Question 25

In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon
-baffle spacing
-clearance
-pitch
-none of these

Answer 25

-none of these

Question 26

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

Answer 26

-inside diameter

Question 27

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

Answer 27

7500

Question 28

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).

Answer 28

both (b) and (c).

Question 29

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.
5
20
35
55

Answer 29

20

Question 30

In chemical process equipments, the conical bottom heads used, usually has an apex angle of
20°
40°
60°
80°

Answer 30

60°

Question 31

Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.
25
50
75
150

Answer 31

75

Question 32

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is
more
same
less
twice

Answer 32

less

Question 33

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.

Answer 33

-ultimate stress to working stress.

Question 34

The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
1-5
20-40
100-150
1000-1500

Answer 34

20-40

Question 35

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

Answer 35

Cross flow

Question 36

What is the value of ‘q’ for saturated liquid feed to a distillation column ?
0
<1
1
>1

Answer 36

1

Question 37

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 (a), (b) and (c).

Answer 37

-all (a), (b) and (c).

Question 38

The main purpose of providing stepping on the trays is to
-increase the residence time.
-decrease the pressure drop.
-facilitate handling of large flow rate of liquid.
-improve the flow condition.

Answer 38

-facilitate handling of large flow rate of liquid.

Question 39

The operating pressure drop range in a bag filter is about __________ mm water gauge.
50-150
5-10
500-1500
1500-2500

Answer 39

50-150

Question 40

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

Answer 40

Ellipsoidal

Question 41

For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
Di, opt = 3 Q0.36 ρ0.18
Di, opt = 3.9 Q0.45 . ρ0.23
Di, opt = 7.6 Q0.36 . ρ0.9
Di, opt = 3 Q0.36 . ρ1.86 μ0.08

Answer 41

Di, opt = 3 Q0.36 ρ0.18

Question 42

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.

Answer 42

-Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.

Question 43

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

Answer 43

less

Question 44

Pick out the wrong statement pertaining to the design of a basket type evaporator.
-It is used for high viscosity liquor having large rate of scaling.
-The tube bundle is suspended on bracket.
-There is no central downtake.
-Downtake is formed by the annular space between the bundle and the shell.

Answer 44

-It is used for high viscosity liquor having large rate of scaling.

Question 45

Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
-The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation.
-Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps.
-The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4.
-none of these.

Answer 45

-none of these.

Question 46

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

Answer 46

0.1 to 2

Question 47

A stuffing box is used for
-absorbing the contraction/expansion of pipeline due to temperature changes.
-prevention of fluid leakage around moving parts.
-facilitating smooth opening and closing of a valve.
-reducing the resistance of fluid flow.

Answer 47

-prevention of fluid leakage around moving parts.

Question 48

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

Answer 48

Δp = G2

Question 49

Pick out the wrong statement.
In an agitated vertical cylinderical reaction vessel, the
-ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1.
-filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period.
-flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids.
-dished bottom vessel has very high power consumption.

Answer 49

-dished bottom vessel has very high power consumption.

Question 50

Needle valves are generally not used for
-very large diameter pipes.
-high pressure throttling service.
-very accurate flow control.
-smaller sizes of pipe.

Answer 50

-very large diameter pipes.

Question 51

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 a, b & c.

Answer 51

-all a, b & c.

Question 52

Pick out the wrong statement.
-Safety valves are provided in heat exchangers for removal of non-conden-sables.
-Liquid metals and dowtherm are used for very high temperature heating.
-In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube.
-A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining of the condensate.

Answer 52

-Safety valves are provided in heat exchangers for removal of non-condensables.

Question 53

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

Answer 53

decreases

Question 54

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.

Answer 54

-central dished section and corner torus section.

Question 55

Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the
-practical limit reached, due to low heat transfer rate because of inadequate temperature difference.
-economic limit reached, when the plant cost exceeds the saving of steam.
-both (a) & (b).
-neither (a) nor (b).

Answer 55

-both (a) & (b).

Question 56

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.

Answer 56

-Allowable vapour velocity.

Question 57

Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele’s method, this method
-is more accurate in finding the number of equilibrium stages.
-accounts for the enthalpy changes in the process.
-facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method.
-all ‘a’, ‘b’ & ‘c’.

Answer 57

-all ‘a’, ‘b’ & ‘c’.

Question 58

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.

Answer 58

-smaller reactor should come first.

Question 59

In a shell and tube heat exchanger, tube side __________ of the mass velocity.
-heat transfer co-efficient is proportional to 0.8th power
-pressure drop is proportional to the square
-both ‘a’ & ‘b’
-neither ‘a’ nor ‘b’

Answer 59

-both ‘a’ & ‘b’

Question 60

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.

Answer 60

-Sorel-Lewis method.

Question 61

Saddle supports are used for supporting __________ vessels.
-horizontal cylinderical
-tall vertical
-thick walled vertical
-thick spherical

Answer 61

-horizontal cylinderical

Question 62

The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.
5 to 10
15 to 30
40 to 50
55 to 75

Answer 62

15 to 30

Question 63

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

Answer 63

5-8

Question 64

Optimum reflux ratio in a continuous distillation column is determined by the
-maximum permissible vapour velocity.
-flooding limit of the column.
-total cost consideration (fixed cost of the column plus the cooling water & steam cost).
-none of these.

Answer 64

-total cost consideration (fixed cost of the column plus the cooling water & steam cost).

Question 65

Cooling water fouling factors vary in the range of 0.001 to 0.003
(BTU/hr.ft2 . °F)-1
(kcal/hr.m2 .°C)-1
(W/m2.°K)-1
(kcal/hr. m. °C)-1

Answer 65

(BTU/hr.ft2 . °F)-1

Question 66

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

Answer 66

0.2 D

Question 66

The maximum liquid gradient over a tray must not exceed
-0.5” -1.25”.
-2”-3.5”.
-5”.
-half the tray spacing.

Answer 66

-0.5” -1.25”.

Question 66

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.

Answer 66

-back up condensate and cause water hammer in steam line.

Question 67

The slope of the feed line in distillation opeartion is given by (where, q = fraction of the feed stream that is liquid.)
-q
-q/(1-q)
-q/(q-1)
none of these

Answer 67

-q/(1-q)

Question 68

Speed of industrial paddle agitator ranges from __________ rpm.
1 to 5
20 to 100
500 to 750
1000 to 2000

Answer 68

20 to 100

Question 69

__________ strain is measured using a ‘strain rosetter’.
-Volumetric
-Shear
-Linear
-none of these

Answer 69

-Linear

Question 70

Thin spherical shells subjected to internal pressure, develop __________ stresses.
-radial
-circumferential
-both (a) & (b)
-neither (a) nor (b)

Answer 70

radial

Question 71

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

Answer 71

-fixed charges initially

Question 72

The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is
0
∞
1
minimum

Answer 72

∞

Question 73

Vertical vessels are not supported by
-brackets
-skirts
-columns
-saddles

Answer 73

saddles

Question 75

With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will
-increase
-decrease
-remain unaffected
-increase or decrease depending on the nature of the dust.

Answer 75

-increase

Question 76

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.

Answer 76

-withstand higher pressure for a given metallic shell thickness.

Question 77

An adequate clearance between the tray and the shell wall of a distillation column is provided to
-drain the liquid from the tray when the unit is not in operation.
-allow for thermal expansion and facilitate installation.
-avoid back-trapping.
-none of these.

Answer 77

-allow for thermal expansion and facilitate installation.

Question 78

Overall tray efficiency of a distillation column is the ratio of the number of
-overall gas transfer units to the number of
ideal trays required.
-ideal trays required to the number of real trays required.
-real trays required to the number of ideal trays required.
-none of these.

Answer 78

-ideal trays required to the number of real trays required.

Question 79

Pick out the wrong statement about the design of a sieve plate column.
a. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns.
b. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design.
c. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns.
d. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.

Answer 79

d. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.

Question 80

Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
10
20
30
5

Answer 80

30

Question 81

Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.
0.1 to 0.25
0.3 to 0.5
0.5 to 0.6
0.65 to 0.80

Answer 81

0.1 to 0.25

Question 82

In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
-zig-zag
-chain
-diamond
-none of these

Answer 82

chain

Question 83

Pick out the wrong statement:
a. The tensile strength of a brittle material is less than its compressive strength.
b. The compressive strength of a ductile materia] is less than its tensile strength.
c. In a thick cylindrical shell, the hoop stress is maximum at the inner radius.
d. The value of crushing load is more than that of buckling load for long colmns.

Answer 83

d. The value of crushing load is more than that of buckling load for long colmns.

Question 84

Generally, elliptical dished heads
a. 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 .
b. resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
c. are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
d. all (a), (b) and (c)

Answer 84

d. all (a), (b) and (c)

Question 85

Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
a. Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
b. Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
c. The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
d. 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.

Answer 85

c. The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.

Question 86

The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
-pd/2t
-pd/4t
-pd/t
-pd/3t

Answer 86

pd/2t

Question 87

Le/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).

Answer 87

-both (b) and (c).

Question 88

LMTD correction factor is used in heat exchanger design for
-double pipe heat exchanger.
-multipass shell and tube heat exchanger.
-fouling fluids.
-counter flow of hot and cold fluids.

Answer 88

-multipass shell and tube heat exchanger.

Question 89

Floating head heat exchangers are used for the
-heat transfer between corrosive fluids.
-cases where temperature difference between the shell and the tubes is more (>50°C).
-co-current heat transfer systems.
-counter-current heat transfer systems.

Answer 89

-cases where temperature difference between the shell and the tubes is more (>50°C).

Question 90

The most common standard size of bubble caps used in industrial operation is
a. 1” dia cap with 0.5” dia riser.
b. 6” dia cap with 4” dia riser.
c. 8” dia cap with 1” dia riser.
d. 4” dia cap with 8” dia riser.

Answer 90

b. 6” dia cap with 4” dia riser.

Question 91

Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.
-nozzle or rim
-flared out
-fluid in
-ring plate

Answer 91

-nozzle or rim

Question 92

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 (a), (b) and (c).

Answer 92

-all (a), (b) and (c).

Question 93

In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
1
8
80
180

Answer 93

8

Question 94

Thickness of the frame of a plate and frame filter as compared to that of plates is
less
same
more
either (a) or (b)

Answer 94

more

Question 95

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 (a), (b) and (c).

Answer 95

-All (a), (b) and (c).

Question 96

The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.
0.3 to 0.8
1.25 to 3.125
3.5 to 7.0
8-12

Answer 96

1.25 to 3.125

Question 97

Rivets are generally specified by the
-head diameter
-shank diameter
-overall length
-none of these

Answer 97

shank diameter

Question 98

Length to diameter ratio of most rotary driers is in the range of
1 to 2
4 to 10
10 to 20
20 to 30

Answer 98

4 to 10