chemical engineering MCQs – Page 81

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 Review each marked answer and report any item that may be outdated or unclear.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
1601. Mass transfer co-efficient is defined as__________________?
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A. Flux=concentration difference/coefficient

B. Flux = Co-efficient/concentration difference

C. Co-efficient = Flux/concentration difference

D. None of these

1602. A 25 cm 25 cm 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m 1m 1cm flat sheet of the same material is to be dried from one side only. Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is ____________________?
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A. 2500

B. 1000

C. 2000

D. 1500

1603. Ammonia present in the coke oven gas is removed by washing with___________________?
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A. Dilute HCl

B. Ethanolamine

C. Caustic solution

D. Dilute ammoniacal liquor
1604. In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?
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A. Greater than

B. Either A., or B.; depends on the type of packing

C. Equal to

D. Smaller than
1605. Large scale drying of wheat is done in a ________________ dryer?
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A. Fluidised bed

B. Spouted bed

C. Vacuum rotary

D. Tray

1606. Bromine content in sea water may be around _________________ ppm?
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A. 640

B. 1875

C. 70

D. 2500

1607. Use of packed towers for distillation is generally limited to the__________________?
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A. High pressure operation

B. Small sizes

C. Vacuum distillation

D. Multi-component distillation

1608. Carbon content of pitch (residue of coal tar distillation) is around ________________ percent?
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A. 70

B. 55

C. 94

D. 80

1609. During sensible cooling process ______________________?
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A. Relative humidity decreases

B. Relative humidity increases

C. Wet bulb temperature decreases

D. Both B. and C.
1610. Raw materials required for the manufacture of __________________ is acetylene and hydrochloric acid?
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A. Phthalic anhydride

B. Maleic anhydride

C. Dacron

D. Vinyl chloride
1611. Glycerine can be obtained from ________________ ?
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A. Fat

B. Cumene

C. Naphthalene

D. Sucrose

1612. How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln ?
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A. 750C

B. 1500C

C. 1000C

D. 500C

1613. For absorbing a sparingly soluble gas in a liquid, the_____________________?
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A. Gas side co-efficient should be decreased

B. Liquid side co-efficient should be decreased

C. Gas side co-efficient should be increased

D. Liquid side coefficient should be increased
1614. In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?
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A. Liquid phase

B. All A , B. & C.

C. Gas phase

D. Interface
1615. The relative volatility of a binary mixture at constant temperature _________________ the total pressure?
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A. Increases with increase in

B. None of these

C. Decreases with increase in

D. Is independent of

1616. Le-Blanc process is a primitive process for the manufacture of___________________?
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A. Soda ash

B. Caustic soda

C. Hydrochloric acid

D. Bromine from sea water

1617. Swenson-Walker crystalliser is a __________________ unit ?
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A. Batch

B. Semi-batch

C. Cooling (adiabatic)-cum-evaporation

D. Continuous
1618. Massecuite is ___________________?
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A. Used as a cattle feed

B. Highly acidic in nature

C. Used for paper making

D. None of these
1619. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
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A. T vs. P

B. log P vs. T

C. P vs. log T

D. log P vs. log T

1620. Heating of _______________ to 120C, produces plaster of paris ?
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A. Calcium sulphate

B. Blue vitriol

C. Gypsum

D. Calcium silicate