chemical engineering MCQs – Page 184

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 Review each marked answer and report any item that may be outdated or unclear.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

3661. 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?
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A. 50

B. 150

C. 25

D. 75

3662. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to _____________________?
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A. 40% of the I.D. of the shell

B. 25 cms

C. 5 cms

D. I.D. of the shell

3663. For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?
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A. Twice

B. Five times

C. Half

D. Thrice

3664. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?
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A. Increases capacity

B. Increases economy

C. Does not affect the capacity

D. Both B. & C.

3665. Baffles may be eliminated for_________________?
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A. Low viscosity liquids (< 200 poise)

B. Large diameter tanks

C. High viscosity liquids (> 600 poise)

D. None of these

3666. 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?
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A. 20-40

B. 5-Jan

C. 1000-1500

D. 100-150

3667. Which of the following packing materials provides for maximum mass transfer ?
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A. Raschig rings

B. All give the same value

C. Raschig rings

D. Cross-partition rings

3668. Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?
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A. None of these

B. SO2

C. CO2

D. NH3

3669. For high pressure process equipments/vessels, the connected nozzle should be____________________?
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A. Screwed

B. Flanged

C. Brazed

D. Welded

3670. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________________?
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A. Remain unaffected

B. Increase or decrease depending on the nature of the dust

C. Increase

D. Decrease

3671. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?
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A. S1.S2

B. 1/S1.S2

C. S2/S1

D. S1/S2

3672. The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ?
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A. None of these

B. #NAME?

C. -q/(1-q)

D. #NAME?

3673. The ends of a cylindrical 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 ?
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A. Flat plate

B. Ellipsoidal

C. Hemispherical

D. Torispherical

3674. A claming section before the liquid flows into the downcomer is provided to__________________?
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A. Cool the liquid before it flows down

B. Reduce the discharge fluctuation

C. Ensure better vapour-liquid contact

D. Permit release of entrained vapour in the liquid

3675. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower ?
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A. All A., B. and C.

B. Size, shape, orientation and surface of the packing particles

C. Density and viscosity of fluids

D. Fluid flow rates

3676. Pick out the correct statement___________________?
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A. None of these

B. Centre to centre distance between two consecutives rivets in a row is called the pitch

C. A riveted joint made in overlapping plates is called butt joint

D. Hole size drilled in riveted plates is less than the actual size of the rivet

3677. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?
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A. Twice

B. Half

C. Four times

D. Equal to

3678. The ratio of shear stress to shear strain is called ____________________?
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A. Bulk modulus

B. Modulus of rigidity

C. Shear modulus

D. Modulus of elasticity

3679. The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area A is given by (where, P = perimeter of the channel in contact with the fluid) ?
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A. A/P

B. ?A

C. 4 P/A

D. 4 A/P

3680. _____________________ tray arrangement is recommended for distillation column having diameter upto 4 ft ?
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A. Radial flow

B. Split flow

C. Cross flow

D. Cascade

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