chemical engineering MCQs – Page 86

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 Review each marked answer and report any item that may be outdated or unclear.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
1701. A good quality coal should have ______________________?
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A. High ash content

B. None of these

C. High sulphur content

D. Low fusion point of ash

1702. Hollander beater used during paper pulp manufacture does not facilitate the ______________ of fiber?
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A. Strengthening

B. Hydration

C. Cutting

D. Fibrillation

1703. The value of L/mG ratio for economical absorption operation ranges from _____________________?
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A. 0.5 to 0.8

B. 1.25 to 2.0

C. 0.8 to 1.2

D. 2.5 to 3.5

1704. Large scale usage of flash distillation is practised in __________________?
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A. Petroleum refining

B. Ammonia synthesis plant

C. Polymerisation industry

D. Soap manufacturing

1705. Leaching of coarse solid lumps is also termed as _____________________?
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A. Dissolution

B. Agitation and settling

C. Percolation

D. Decoction

1706. Which of the following processes is followed by unsaturated air (with dry bulb temperature 12C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40C ?
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A. Humidification only

B. Heating only

C. Both heating and humidification

D. Evaporative cooling

1707. Coke oven gas consists mainly of ____________________?
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A. CH4, & CO

B. CO, & CO2

C. H2, & CH4

D. H2, & CO

1708. Average sulphur content in Indian pyrites is about _________________ percent?
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A. 35

B. 55

C. 15

D. 70

1709. Gypsum is chemically __________________ ?
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A. Calcium chloride

B. Calcium sulphate

C. Potassium sulphate

D. Sodium sulphate

1710. Hollander beater machine used in the paper manufacturing plant does not accomplish the task of____________________?
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A. Cutting of fibres

B. Hydration of fibres

C. Final rolling out of paper

D. Fibrillation of fibre

1711. Main constituents of Portland cement are calcium aluminate and__________________?
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A. Silicates

B. Carbonates

C. Gypsum

D. Sodium silicate

1712. Flash distillation is _______________________?
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A. Same as simple distillation

B. Used for multi-component systems like crude refining

C. Most useful for handling binary systems

D. Same as differential distillation

1713. Operating velocity in a packed tower is usually __________________ the flooding velocity ?
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A. Twice

B. Half

C. More than

D. Equal to

1714. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?
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A. M ln(Xo/XF)

B. M(Xo XF)

C. M(Xo/XF)

D. MXo ln(Xo/XF)
1715. The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_________________?
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A. Integral heat of adsorption

B. None of these

C. Heat of wetting

D. Differential heat of adsorption
1716. Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is___________________?
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A. Soluble in the liquid

B. Non-ideal in nature

C. Insoluble in the liquid

D. At a fixed temperature

1717. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?
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A. Remains unchanged

B. Decreases exponentially

C. Decreases

D. Increases
1718. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a _______________ column?
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A. Bubble cap plate

B. Packed

C. Wetted wall

D. Spray

1719. Freundlich equation applies to the adsorption of solute from___________________?
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A. Gaseous solutions at high pressure

B. Concentrated solutions

C. None of these

D. Dilute solutions, over a small concentration range
1720. Co-current absorbers are usually used when the gas to be dissolved in the liquid is ___________________?
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A. A pure substance

B. Highly soluble

C. A mixture

D. Sparingly soluble