chemical engineering MCQs – Page 187

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 Review each marked answer and report any item that may be outdated or unclear.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
3721. The normal range of velocity of steam in pipes is _________________________ m/sec?
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A. 20-Oct

B. 0.1-0.5

C. 5-Jan

D. 80-100
3722. Holes of a sieve tray are arranged in triangular pitch of _________________ times the hole diameter?
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A. 2.5 to 5

B. 5 to 10

C. 10 to 15

D. 1.5 to 2

3723. A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _____________ deviation from Raoults Law?
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A. Negative

B. Positive

C. No

D. None of these

3724. Speed of industrial paddle agitator ranges from _____________ rpm?
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A. 20 to 100

B. 500 to 750

C. 1000 to 2000

D. 1 to 5

3725. ______________ of water makes it a widely used coolant in heat exchangers?
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A. Low viscosity

B. High specific heat

C. Low corrosiveness

D. Low dirt factor

3726. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is____________?
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A. Less

B. More

C. More or less depending upon the pressure & temperature inside the vessel and the nature of

D. fluid contained therein

E. Same

3727. In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for______________?
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A. Reducing scale deposition

B. Increasing pressure drop

C. Creating turbulence

D. Fixing the tubes

3728. Diameter of bubble caps used in high pressure columns is ______________ as compared to that used in identical vacuum columns?
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A. More

B. Same

C. Less

D. Either A. or B.; no generalisation can be made

3729. In case of a continuous distillation column, increase in reflux ratio may result in the______________?
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A. All A., B. and C.

B. Lower fixed charges for the column

C. Greater cost for the condenser coolant

D. Greater cost for the reboiler heat supply

3730. In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?
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A. ?d/4P2

B. 4P2/?d

C. (P2 rd2/4)/rd

D. 4(P2 ?d2/4)/?d
3731. In distillation columns, bubble caps are held in place over trays by ________________?
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A. Rivets

B. A hold down bar

C. Bolts

D. Both B. and C.
3732. (Le/D) for fully open gate valves would be __________________?
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A. Much more than that for fully open globe valves

B. Much less (say 2% than that for fully open globe valves)

C. Around 7

D. Both B. and C.
3733. Joint efficiency (J) for a seamless pipe is_______________?
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A. 1.5

B. 1

C. < 0.5

D. 0.85

3734. At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?
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A. Lower

B. Same

C. Unpredictable

D. Higher

3735. Speed of the drum of the rotary vacuum filter normally ranges from _____________ rpm?
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A. 3 to 8

B. 8 to 15

C. 0.1 to 2

D. 5 to 7

3736. Reflux ratio variation in a distillation column is between___________________?
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A. Zero and infinity

B. Zero and one

C. None of these

D. Minimum and infinity
3737. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases?
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A. Fixed charges initially

B. Running cost of cooling water for condenser

C. Vapour & liquid load both

D. Running cost of steam for reboiler

3738. The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?
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A. Gas flow rate

B. Electrode area

C. Both A. & B.

D. Neither A. nor B.

3739. Value of Peclet number = ?, is the representative of___________________?
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A. Plug flow

B. Eddy diffusivity = 0

C. Complete back mixing

D. Laminar flow

3740. Maximum size of the raschig rings used in a packed tower is about _______________ of the column diameter?
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A. 1/50th

B. 1/10th

C. 1/20th

D. 1/30th