chemical engineering MCQs – Page 79

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 Review each marked answer and report any item that may be outdated or unclear.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
1561. In steam distillation, the _____________________?
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A. Temperature is 100C

B. Temperature is higher than the boiling point of either component

C. Temperature is more than 100 C

D. Product must be immiscible with water
1562. Chemical name of Grignard reagent is__________________?
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A. Sodium bicarbonate

B. Sodium thiosulphate

C. Sodium sulphite

D. Ethyl magnesium chloride
1563. Poly Tetrafluoroethylene (P.T.F.E.) is known as___________________?
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A. Dacron

B. Bakelite

C. Teflon

D. Celluloid

1564. The Hatta number is important in_________________?
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A. Gas absorption without chemical reaction

B. Multi-component distillation

C. Gas absorption with chemical reaction

D. Binary distillation

1565. Leaching of uranium ore and gold ore is done in_____________________?
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A. Pachuca tanks

B. Centrifugal extractor

C. None of these

D. Bollman extractor

1566. Oil produced by solvent extraction________________?
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A. Has low free fatty acid content

B. Is odourless

C. Both A. & B.

D. Neither A. nor B.
1567. Triple superphosphate is manufactured by reacting ____________________?
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A. Phosphate rock with nitric acid

B. Phosphate rock with sulphuric acid

C. Ammonium phosphate with phosphoric acid

D. Phosphate rock with phosphoric acid
1568. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________?
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A. Liquid stream should be distributed uniformly

B. Gas stream should be distributed uniformly

C. Both gas as well as liquid streams should be distributed uniformly

D. By passing should be completely avoided

1569. In triangular co-ordinates, the ternary composition point falls ___________________ of the triangle?
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A. In the corners

B. None of these

C. On the sides

D. Inside
1570. Ultimate analysis of coal determines its _______________________ content?
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A. Carbon, sulphur, volatile matter & ash

B. Carbon, volatile matter, ash & moisture

C. Carbon, ash, sulphur & nitrogen

D. Carbon, hydrogen, nitrogen & sulphur

1571. In case of unsaturated air_________________?
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A. Dew point < wet bulb temperature

B. Wet bulb temperature < dry bulb temperature

C. Both A. and B.

D. Neither A. not B.

1572. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and t is time) ?
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A. (4De/?t)1/2

B. (4De/t)

C. (De.t)1/2

D. (De/t)1/2

1573. Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?
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A. Same as

B. Higher than

C. Lower than

D. Either same or higher than

1574. Perforated plate towers are unique for solvent extraction because, they provide_____________________?
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A. None of these

B. Repeated coalescence & redispersion of the drop phase

C. Higher contact area

D. Better contact of the phase

1575. Design calculation for multiple component distillation is done by_________________?
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A. McCabe-Thiele method

B. Tray to tray calculations

C. Ponchon-Savarit method

D. Enthalpy concentration method

1576. For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a ____________ of the equilateral triangular co-ordinates?
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A. Pure component is represented by the apex

B. Ternary mixture is represented by the sides

C. Binary mixture is represented by the apex

D. Binary mixture is represented by any point inside

1577. Which of the following is a constituent of vinegar ?
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A. Around 10% alcohol

B. Around 1% acetic acid

C. Both A. and B.

D. Neither A. nor B.

1578. High pressure at the bottom of a distillation tower handling heat sensitive materials results in____________________?
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A. Thermal decomposition of bottoms

B. Very efficient operation

C. Increased relative volatility

D. Erosion of the tower

1579. As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages_______________________?
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A. Decrease
B.

C. Remain unchanged

D. Can either increase or decrease, depends on the system

1580. The purpose of adding Na2CO3 to water of low alkalinity is to__________________?
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A. Permit the use of alum as a coagulant

B. Facilitate easy regeneration of zeolite

C. All A , B. and C.

D. Increase the softening capacity of zeolite