Latest Chemical Engineering MCQs – Process Equipment and Plant Design MCQs
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Latest Chemical Engineering MCQs
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Latest Process Equipment and Plant Design Mcqs
The most occurred mcqs of Process Equipment and Plant Design in past papers. Past papers of Process Equipment and Plant Design Mcqs. Past papers of Process Equipment and Plant Design Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Process Equipment and Plant Design Mcqs. The Important series of Process Equipment and Plant Design Mcqs are given below:
Hole diameter of the sieve trays in the distillation column ranges from ______________ mm?
A. 4 to 8
B. 1 to 3
C. 3 to 12.5
D. 12.5 to 18.5
In case of 1.5″ heat exchanger tubes, the inside flow area _____________ with decrease in BWG?
A. Remains same
B. Decreases
C. Increases
D. None of these
Hoop (circumferential) stress induced in a thin walled ‘Horton Sphere’ used for the storage of liquid ammonia under pressure is____________________?
A. pD/2T
B. pD/3T
C. pD/4T
D. pD/6T
In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?
A. 0.25
B. 0.8
C. 0.1
D. 0.5
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 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?
A. To provide support to the tube bundle
B. To increase the residence time of shell side fluid
C. To reduce the induced vibration in the tubes
D. To increase the tube side heat transfer co-efficient by inducing turbulence
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of ____________________?
A. Preventing the local overstressing of the shell around the opening
B. Making the joint leak proof
C. Reduction of discontinuity in shape at the junction
D. None of these
In most of the shell and tube heat exchangers, the tube pitch is generally ______________ the tube diameter?
A. 2.5 times
B. 1.25-1.50 times
C. Less than
D. one-fourth of
Movement of pipeline caused by thermal expansion is taken care by providing ___________________?
A. Changes in its direction
B. Expansion joint
C. Change in the shape of pipeline
D. All A., B. and C.
For a given fluid, as the pipe diameter increases, the pumping cost ____________________?
A. Decreases
B. Remain unaffected
C. Increases
D. May increase or decrease depending upon whether the fluid is Newtonian or non-Newtonian
In a vertical short tube evaporator (Calandria type), the ______________________?
A. Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
B. Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are normally used
C. Liquor is inside the tube while the steam is outside the tube
D. All A., B. & C.
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 ______________?
A. Are less prone to fouling
B. Are easier to clean
C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D. None of these
In a bag filter, the pressure drop increases directly as the___________________?
A. Viscosity of the gas and inversely as density of the gas
B. Density of the gas and inversely as viscosity of the gas
C. Density of the gas, but is independent of the viscosity of the gas
D. None of these
When one of the fluids is highly corrosive and has fouling tendency, it should_____________________?
A. Preferably flow inside the tube for its easier internal cleaning
B. Flow at a very slow velocity
C. Preferably flow outside the tube
D. Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
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 ____________________?
A. d
B. 0.5 d
C. 1.5 d
D. 2.5 d
Stoichiometry Mcqs
The distance between the centres of a rivet hole to the nearest edge of the plate is called _________________?
A. Back pitch
B. Margin
C. Pitch
D. None of these
Which of the following types of reactors is the safest from operation point of view ?
A. A vapor phase reactor
B. A liquid phase reactor
C. Pot type reactor
D. A liquid phase catalytic reactor
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around _________________?
A. 5″
B. 0.5″
C. 2.5″
D. 50% of the plate spacing
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?
A. Trouton’s rule is applicable
B. Sensible heat differences are small, because the temperature changes from tray to tray is small
C. Liquid/vapor loading across the column remains constant
D. All A., B. and C.
(Le/D) for a Tee (used as elbow, entering branch) would be ____________________?
A. Less than that for Tee (used as elbow, entering run)
B. Around 90
C. More than that for Tee (used as elbow, entering run)
D. Both B. and C.
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design____________________?
A. Only if the opening is on a vertical cylindrical vessel
B. Only if the opening is on spherical vessel
C. Only if the opening is on a horizontal cylindrical vessel
D. Irrespective of the shape of the vessel
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
A. 20.8
B. 1
C. ∞
D. 2
The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?
A. Less than
B. More than
C. Equal to
D. Either B. or C.; depends on maximum permissible internal pressure
Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?
A. 100 to 150
B. 50 to 100
C. 250 to 500
D. 600 to 700
Souders Brown equation given by, U = Kv √(ρl – ρv)/ρv, is used for the calculation of the ______________ in a continuous distillation column?
A. Diameter of the bubble cap column
B. Tray pressure drop
C. Diameter of the sieve plate column
D. Residence time in the downcomer for the disengagement of entrained vapour
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is____________________?
A. 0.25
B. 0.75
C. 0.50
D. 1.25
Optimum economic pipe diameter for fluid flow is determined by the____________________?
A. Density of the fluid
B. Viscosity of the fluid
C. Total cost considerations (pumping cost plus fixed cost of the pipe)
D. None of these
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_________________?
A. d1/(d1 + d2)
B. (d1 + d2)/d1
C. d2/(d1 + d2)
D. (d1 + d2)/d2
Seamless pipe is made________________?
A. From rolled strips formed into cylinders and seam-welded
B. By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing
C. By extrusion & casting into static and centrifugal molds
D. Both B. and C.
A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?
A. 67
B. 38
C. 19
D. 95
Maximum acceptable total liquid gradient over a tray is about _______________ mm?
A. 30.5
B. 12.5
C. 5.5
D. 45.5
Diameter of the sieve tray column is determined by the_________________?
A. Hole diameter of the sieve tray
B. Upper limit of the vapour velocity
C. Lower limit of vapour velocity
D. Height of the plate spacing
Le/D) for 90° elbow (medium radius) and 90°square elbow would be respectively around___________________?
A. 25 and 60
B. 100 and 250
C. 3 and 5
D. 250 and 600
Maximum plate efficiency is achieved in case of ______________ flow?
A. Cascade
B. Cross
C. Split
D. Reverse
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″)?
A. Three fourth
B. Half
C. Equal to
D. 1.5 times
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?
A. 0.5 nth
B. (1/n)th
C. nth
D. 1.5 nth
Process Equipment And Plant Design Mcqs
Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?
A. 0 to 0.08
B. 0 to 1.5
C. 0 to 0.8
D. 0 to 2.2
Liquid gradient over a tray can be minimised by________________?
A. Providing a higher skirt clearance or a higher weir
B. Using split flow, radial flow or cascade flow for column diameter large than 4 ft
C. 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 flow
D. All A., B. and C.
Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?
A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
B. < 4 : 1 for gas-gas exchangers
C. 4 : 1 to 8 : 1 for liquid-liquid exchanger
D. Both B. & C.
(Le/D) for couplings and unions would be_______________?
A. 200
B. 60
C. 350
D. Negligible
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________________?
A. Bending
B. Shear
C. Deformation
D. Elongation
The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?
A. 1/2
B. 2
C. 4
D. 1/4
_____________ heat exchanger is also known as ‘hair pin type’ exchanger?
A. Double pipe
B. Plate type
C. Finned
D. Regenerative
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ?
A. Results in higher shell side pressure drop
B. Can accomodate less number of tubes for a given shell diameter
C. Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient
D. Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?
A. 1.25
B. 2.5
C. 1.75
D. 3.5
Which of the following efficiencies can be greater than 100% ?
A. Point efficiency
B. Murphree plate efficiency
C. Overall plate efficiency
D. None of these
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above ____________________ poise?
A. 1000
B. 600
C. 300
D. 1500
What is the slope of the operating line in the rectifying section of a distillation column ?
A. ∞
B. 0
C. > 1
D. <1
The ratio of lateral strain to linear strain is termed as the___________________?
A. Poisson’s ratio
B. Modulus of elasticity
C. Bulk modulus
D. Shear modulus
Normal screwed fittings are used for pipes upto a diameter of _______________ inches?
A. 5
B. 3
C. 1.5
D. 9
The ratio, (propeller agitator dia/tank dia) is normally taken as____________________?
A. 0.15-030
B. 0.75-0.85
C. 0.5-0.65
D. 0.60-0.90
Tube height in a calandria type evaporator is normally less than _______________ metres?
A. 3.5
B. 2
C. 1
D. 5.5
Weep holes provided in the plates of a distillation column ____________________?
A. Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
B. Facilitate draining out liquid from a tray when the unit is not in operation
C. Must be large enough (usually 1/4″ to 5/8″ dia) to prevent plugging but should not deliver excessive amount of fluid during operation
D. All A., B. and C.
Pick out the wrong statement about distillation operation__________________?
A. 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
B. In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation
C. Distillation under vacuum is a substitute for steam distillation
D. Flash distillation, differential distillation & steam distillation are all continuous distillation processes
Pick out the wrong statement pertaining to ‘Horton sphere’ used for the storage of liquid ammonia ?
A. Thickness of spherical shell is half that of the cylindrical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape; hence insulation required is less
B. Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column
C. Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm2
D. Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2
Polymer Technology Mcqs
Pick out the wrong statement?
A. Safety valves are provided in heat exchangers for removal of non-condensable
B. Liquid metals and Dowtherm are used for very high temperature heating
C. A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining of the condensate
D. In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube
Pick out the wrong statement about the design of a sieve plate column ?
A. 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
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. 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
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
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
A. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap
B. 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
C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range
Pick out the wrong statement ?
A. For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel
B. Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor
C. Fouling factor of river water is less than that of sea water
D. Both B. and C.
Pick out the correct statement ?
A. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty
B. Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency
C. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower
D. None of these
Pick out the wrong statement. In an agitated vertical cylindrical reaction vessel, the___________________?
A. Filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period
B. Ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1
C. Flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids
D. Dished bottom vessel has very high power consumption
Pick out the wrong statement pertaining to a shell and tube heat exchanger ?
A. The minimum value of baffle spacing is 50 mm
B. 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
C. The maximum value of baffle spacing is equal to the I.D. of the shell
D. Disk and doughnut baffle is the most commonly used baffle
Pick out the wrong statement pertaining to the design of a basket type evaporator ?
A. It is used for high viscosity liquor having large rate of scaling
B. There is no central downtake
C. The tube bundle is suspended on bracket
D. Downtake is formed by the annular space between the bundle and the shell
Pick out the correct statement?
A. Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes
B. It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling
C. Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing
D. Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding
Pick out the wrong statement?
A. The compressive strength of a ductile material is less than its tensile strength
B. The tensile strength of a brittle material is less than its compressive 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 columns
Pick out the wrong statement?
A. Riveting provides a permanent fastening method
B. The joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called ‘double riveted butt joint’
C. The efficiency of a riveted joint is the ratio of the strength of the riveted joint to the strength of the solid plate
D. Shank diameter of the rivets should be less than the size of the hole drilled in the plate for riveting
Pick out the wrong statement ?
A. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value Plate
B. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1″
C. efficiency increases with increase in superficial vapour velocity till entrainment limit
D. None of these
Pick out the wrong statement?
A. Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing
B. In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used
C. In a sieve tray, the minimum hole diameter is equal to the tray thickness
D. In a stainless steel sieve tray, the minimum hole diameter is equal to 10 times the plate thickness
Pick out the wrong statement ?
A. Lug supports are less expensive than other type of supports
B. The method of fixing tubes to a tube sheet by expanding is called ‘tube rolling’
C. A reducer is used to change the direction of a pipe in a straight run
D. A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness compared to the tube