chemical engineering MCQs – Page 76

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 Review each marked answer and report any item that may be outdated or unclear.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
1501. Paper grade bamboo contains about _______________ percent cellulose ?
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A. 40

B. 60

C. 20

D. 5
1502. Alcohol percentage in molasses may be around _____________________?
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A. 40

B. 10

C. 85

D. 70

1503. Which of the following is a constituent of coffee ?
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A. Nicotine

B. Lignin

C. Caffeine

D. Calgon

1504. Pick out the wrong statement ?
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A. Absorption factor is constant, when the equilibrium and operating lines are straight

B. In case of a stripper, the equilibrium curve is always below the operating line

C. In the absorption of low solubility gases, the liquid film is the controlling resistance

D. In case of an absorber, the operating line is always above the equilibrium curve

1505. The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 PA2) is for_______________________?
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A. None of these

B. Steady state diffusion for stagnant case

C. Ficks second law of diffusion

D. Liquid M.T.C. by Higbie penetration theory

1506. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?
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A. 5.6 10-3

B. 5.6 10-4

C. 8.5 10-3

D. 8.5 10-4
1507. The cooling effect in a cooling tower can be speeded up by _______________________?
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A. Reducing the barometric pressure

B. Reducing the humidity of the air

C. Increasing the air velocity and area of exposed wet surface

D. All A., B. and C.
1508. The drying time between fixed moisture content within diffusion controlled falling rate period is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
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A. T

B. ?T

C. T3

D. T2
1509. Dried finished product sampled from various parts of a ________________ dryer exhibits nonuniformity in the moisture content?
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A. None of these

B. Tray

C. Rotary

D. Freeze

1510. At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes_____________________?
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A. ?

B. 0

C. None of these

D. 1

1511. Liquefaction of gases cannot be done by___________________?
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A. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

B. Adiabatic expansion against a piston or in a turbine

C. Merely compressing it beyond critical pressure

D. Exchange of heat with colder stream

1512. Paper industry employs _____________ driers ?
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A. Spray

B. Rotary

C. Fluidised bed

D. Cylinder
1513. Water entrained by circulating air in cooling towers is termed as________________?
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A. Vapor load

B. None of these

C. Blow down

D. Drift
1514. With increase in temperature, the leaching rate increases due to__________________?
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A. Decreased liquid viscosity

B. Increased diffusivity

C. Both A. and B.

D. Neither A. nor B.

1515. When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system ?
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A. As the acetone concentration increases, the solubility curves approach each other

B. Both the phases become identical at a particular common point on both the solubility curves

C. led the plait point

D. The distribution curve which is a plot between x (acetone concentration in one phase) and y

E. etone concentration in other phase) is analogous to x-y curve used in distillation and

F. orption terminates on the x = y diagonal at the concentration of the plait point

1516. In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is_________________?
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A. Called integral heat of adsorption

B. Equal to the heat of wetting

C. Equal to the heat of formation of surface compound

D. Zero

1517. In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?
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A. 1/KG = 1/KL + m/KG

B. 1/KG = 1/KG + m/KL

C. KG = 1/KL + m/KG

D. KG = 1/KG + m/KL

1518. Systemic insecticides________________?
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A. Kill insects following external bodily contact

B. Emit poisonous vapour

C. Are stomach poisons

D. Are absorbed throughout the plant
1519. For the same system, if the same liquid used in an absorber is decreased, the tower height will__________________?
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A. Decrease

B. Decrease or increase; depends on the type of liquid

C. Increase

D. Remain unaffected

1520. Which of the following is directly concerned with Psychrometry ?
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A. Weber number

B. Galileo number

C. Dean number

D. Lewis relationship