chemical engineering MCQs – Page 182

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

3621. _______________ shaped roof is most commonly used for cylindrical tanks ?
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A. Dome

B. Flat

C. Umbrella

D. Cone

3622. 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 ?
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A. 1

B. > 1

C. Equal to the order of reaction

D. < 1

3623. _____________ dished head is the strongest of all?
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A. Hemispherical

B. Torispherical

C. Elliptical

D. None of these

3624. Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if___________________?
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A. Plain carbon steel and cast iron parts are used

B. Wall thickness is > 30 mm

C. Material of construction is high alloy steel

D. Both B. & C.

3625. In a thin cylindrical shell, the hoop stress is ________________ stress?
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A. Radial

B. Circumferential tensile

C. Compressive

D. Longitudinal

3626. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?
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A. 20.2

B. 2

C. 20.8

D. None of these

3627. Which of the following is used to set the diameter of the distillation column ?
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A. Static submergence

B. Number of theoretical plates

C. Length of straight rectangular weir on cross-flow tray

D. Allowable vapour velocity

3628. The function of manholes provided in the shell of a distillation column is to __________________?
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A. All A., B. and C.

B. Keep a check on the liquid gradient over the plate by direct visual observation

C. Give access to the individual trays for cleaning, maintenance and installation

D. Guard against foaming & entrainment by dumping antifoaming agent through it

3629. Frame thickness in the plate and frame filter press is normally in the range of ______________ inches?
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A. 1 to 5

B. 0.25 to 4

C. 1 to 12

D. 0.25 to 8

3630. Height of the flights in the rotary drier is in the range of___________________?
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A. 0.2 to 0.5 d

B. 0.02 to 0.05 d

C. 0.5 to 0.6 d

D. 0.08 to 0.12 d

3631. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________?
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A. Allowable gas velocity through the slots

B. All A., B. and C.

C. Plate spacing

D. Diameter of the column

3632. In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?
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A. 17.5

B. 2.5

C. 5

D. 12.5

3633. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to___________________?
0

A. G0.8

B. G1.5

C. G0.2

D. G0.5

3634. Bubble cap tray is the most commonly used tray in large distillation column, because______________?
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A. None of these

B. It incurs less pressure drop as compared to any other try designed for the same duty

C. It eliminates the foaming and entrainment tendency during operation

D. Of its flexibility and nearly constant efficiency under varying conditions of operation

3635. Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?
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A. Lug

B. Saddle

C. Skirt

D. Guy wire

3636. Pick out the wrong statement ?
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A. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

B. In a flanged and shallow dished head, the crown radius is > shell outside diameter

C. In a flanged and standard dished head, the crown radius is ? shell outside diameter

D. Flat head covers are most suitable for larger vessels operating at very high pressure

3637. ____________ is the determining factor for the number of bubble caps to be used per tray?
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A. Tray diameter

B. Permissible slot velocity

C. Liquid load

D. Vapor load

3638. A cylindrical storage tank can have a self supported conical roof ?
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A. If its diameter is less than 15-20metres

B. Irrespective of its diameter

C. If its diameter is more than 50 meters

D. If the thickness of the roof is more than that of the cylindrical shell

3639. In case of a thin pressure vessel, the ratio of its diameter to wall thickness is_________________?
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A. < 10

B. > 20

C. 30

D. > 10

3640. For turbine agitator, the impeller diameter is about_________________?
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A. 0.3 to 0.5 d

B. 0.65 to 0.85 d

C. 0.1 to 0.2 d

D. 0.95 d

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