chemical engineering MCQs – Page 176

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 Review each marked answer and report any item that may be outdated or unclear.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
3501. Breathing loss on storage of gasoline occurs due to the _____________________?
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A. Presence of unsaturated air

B. Fluctuation of ambient temperature during day and night

C. Both A. and B.

D. Neither A. nor B.

3502. ________________ liquor is best handled in a long tube vertical evaporator ?
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A. Scaling

B. Viscous

C. Salting

D. Foamy
3503. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually__________________?
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A. 45

B. 30

C. 75

D. 60
3504. Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?
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A. High latent heat

B. High film co-efficient

C. Low cost

D. Non-corrosive condensate

3505. Thickness of the frame of a plate and frame filter as compared to that of plates is___________________?
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A. Same

B. More

C. Either A. or B.

D. Less

3506. Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?
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A. 200

B. 10

C. 50

D. 100
3507. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwins formula as___________________?
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A. d = 3 ?t

B. d = 1.5 t

C. d = 1.1 t

D. d = 1.6 ?t
3508. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as d will be__________________?
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A. ?(2d)

B. ?(2?d)

C. ?d

D. d
3509. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?
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A. Central dished section and corner torus section

B. Straight flange section and corner torus section

C. Central dished section and straight flange section

D. Corner torus section and central dished section

3510. In a shell and tube heat exchanger, tube side _______________ of the mass velocity?
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A. Heat transfer co-efficient is proportional to 0.8th power

B. Pressure drop is proportional to the square

C. Both A. & B.

D. Neither A. nor B.

3511. The dust collection efficiency of a cyclone separator_________________?
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A. None of these

B. Is inversely proportional to the mass of the dust particle

C. Decreases with increase in gas flow rate

D. Is directly proportional to the radius of the dust particle path

3512. The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?
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A. 3.5 to 7.0

B. 8 to12

C. 1.25 to 3.125

D. 0.3 to 0.8

3513. The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?
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A. 1.2-1.5

B. 0.1-0.2

C. 0.4-0.9

D. 0.2-0.5

3514. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?
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A. Type and size of packing

B. Flow rates of each fluid

C. All A, B. & C.

D. Concentration of each fluid

3515. ____________________ strain is measured using a strain rosetter ?
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A. Linear

B. None of these

C. Shear

D. Volumetric

3516. For a 25 mm hole drilled in plates to be riveted, the shank diameter of the rivet should be _______________ mm?
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A. 27

B. 23

C. 25

D. 26

3517. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a __________________?
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A. Cap pitch of 1.3-2 times the cap diameter

B. Either A. or B.

C. Neither A. nor B.

D. Clearance of 25-75 mm

3518. The wall thickness for a large high pressure pipeline is determined by the consideration of the____________________?
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A. Temperature stresses

B. Forces exerted by static and dynamic action at bends

C. Axial tensile stress in the pipe

D. Circumferential pipe-wall tension
3519. The maximum liquid gradient over a tray must not exceed__________________?
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A. 2?-3.5?

B. Half the tray spacing

C. 0.5? -1.25?

D. 5?

3520. The buckling tendency of compression members is always in the direction of the _____________________?
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A. Least radius of gyration

B. Perpendicular to the axis of the load

C. Axis of the load

D. None of these