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.

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

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

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
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

3524. Spherical shaped pressure vessel is considered to be the most ideal, because it can___________________?
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A. Withstand higher pressure for a given metallic shell thickness

B. Be designed without wind load considerations

C. Be supported very easily

D. Be fabricated very easily

3532. The value of fouling factor depends upon the__________________?
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A. Characteristic of process fluid

B. Velocity of process fluid containing suspended solids

C. All A., B. and C.

D. Suspended solids in the fluid

3538. Smokers equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?
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A. Relative volatility is close to one (e.g., separation of close boiling isomers)

B. Feed is not at its bubble point

C. Number of equilibrium stages required is likely to be very small

D. Number of equilibrium stages in only stripping section is to be calculated

3540. Lug support is meant for supporting _______________ vessels?
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A. Thick walled tall

B. Large horizontal cylindrical

C. Tall but empty

D. Small
3543. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?
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A. More than that for fluid flow

B. Less than that for fluid flow

C. Same as that for fluid flow

D. D2 D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

3544. In shell and tube heat exchangers, straight tie rods are used to_________________?
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A. None of these

B. Account for thermal strain

C. Fix the tubes in position

D. Hold baffle in space
3545. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?
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A. Heat transfer rate is independent of tube arrangement

B. Diagonal square pitch

C. Square pitch

D. Triangular pitch
3546. Excessive liquid gradient on a tray may result in the______________________?
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A. All A., B. and C.

B. Maldistribution of gas

C. Back trapping

D. Gas blowing beneath cap skit

3547. Back-trapping in a distillation column results due to_________________?
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A. Low reflux ratio

B. Excessive liquid gradient over the tray

C. Low gas velocity

D. High gas velocity

3549. Generally, elliptical dished heads____________________?
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A. ssure vessels operating above a pressure of 1.5 MN/m2

B. ll of the same thickness and diameter

C. Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for

D. Are approximately as strong as seamless cylindrical shell having the corresponding I.D and

F. All A., B. and C.