chemical engineering MCQs – Page 186

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 Review each marked answer and report any item that may be outdated or unclear.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

3701. In a heat exchanger, shell side fluid velocity can be changed by changing the tube _______________________?
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A. Layout

B. Pitch

C. Both A. & B.

D. Neither A. nor B.

3702. Liquid gradient over the tray results due to the___________________?
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A. Large plate spacing

B. Resistance offered to flow of liquids by caps & risers and the flow of gas

C. Large reflux ratio

D. Low gas velocity

3703. 1.2 to 3.8 cms is the value of the ______________________?
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A. Skirt clearance for bubble caps

B. All A., B. and C.

C. Static submergence in case of a bubble cap tray for column operating under pressure (? 1 atm)

D. Downcomer liquid seal in case of a balanced tray design

3704. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency___________________?
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A. May increase or decrease depending upon the plate spacing

B. Remain same

C. Increases

D. Decreases

3705. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?
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A. 45

B. 95

C. 60

D. 80

3706. Pick out the wrong statement pertaining to the design of a long tube vertical evaporator ?
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A. Steam is fed to the shell, whereas the liquor is filled inside the tube

B. Tube dia is 3-6 cms, while tube length in 3-6 metres

C. None of these

D. Liquor level is maintained at 1/3rd to 1/2 of the height of the tube

3707. A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows ______________ deviation from Raoults Law?
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A. No

B. Positive

C. Negative

D. None of these

3708. A rupture disc is provided in chemical equipments as an accessory meant for ___________________?
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A. Creating turbulence

B. Avoiding vortex formation

C. Enhancing mixing rate

D. Relieving excess pressure

3709. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference ______________________?
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A. Is always more than arithmetic mean value and the geometric mean value

B. ther the flow of stream is co-current or counter-current

C. Is always less than arithmetic average value

D. May be either more or less than geometric mean and arithmetic mean value depending upon

E. Is always less than arithmetic mean value, but more than geometric mean value

3710. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?
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A. 0.5 to 1.5

B. 5 to 10

C. 2.5 to 4.0

D. 10 to 15

3711. Length to diameter ratio of most rotary driers is in the range of____________________?
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A. 10 to 20

B. 4 to 10

C. 1 to 2

D. 20 to 30

3712. 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?
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A. 15-Aug

B. 5-Mar

C. 18-Dec

D. 5-11

3713. Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?
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A. 5 to 10

B. 1.5 to 2.5

C. 0.01 to 1

D. 10 to 20

3714. In actual operation of a bubble cap distillation tower, the ______________ at the bottom of the tower is more than that at the top of the tower?
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A. All A., B. and C.

B. Pressure and temperature

C. Molal flow rate of vapour

D. Vapour molecular weight

3715. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ?
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A. Larger dia vessel

B. Strength of the vessel is same irrespective of the diameter

C. Larger dia long vessel

D. Smaller dia vessel

3716. The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ?
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A. 15 to 30

B. 55 to 75

C. 40 to 50

D. 5 to 10

3717. In a ______________ riveted joint, the rivets in the various rows are opposite to each other?
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A. Chain

B. None of these

C. Zig-zag

D. Diamond

3718. Which of the following material is seldom used for pressure vessel construction ?
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A. Killed steel

B. Semi-killed steel

C. Rimmed still

D. Mild steel

3719. Pressure drop per tray in the atmospheric distillation column is about ________________ psi?
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A. 1 3

B. 0.5 1.0

C. 0.01 0.5

D. 0.07 0.12

3720. Flanges are connected to pipes by _______________________?
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A. All A., B. and C.

B. Screwing

C. Brazing

D. Welding

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