chemical engineering MCQs – Page 83

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 Review each marked answer and report any item that may be outdated or unclear.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
1641. Which of the following provides maximum contact surface for a liquid-vapour system ?
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A. Wetted wall column

B. Packed tower

C. Bubble-cap plate column

D. Sieve-plate column

1642. Plaster of Paris is __________________?
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A. CaSO4.H2O

B. Used for setting of broken bones

C. Both A. and B.

D. Same as gypsum

1643. In liquid extraction, if the selectivity is unity, then__________________?
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A. Amount of solvent required will be minimum

B. No separation will occur

C. Solvent flow rate should be very low

D. Separation of the constituents is the most effective

1644. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?
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A. Continuous

B. None of these

C. Steam

D. Azeotropic

1645. An alkali metal salt of Palmitic acid is known as _____________________?
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A. Soap

B. Detergent

C. Metallic soap

D. Alkaloid

1646. Percentage of uranium in Carnotite ore found in Jadugoda (Jharkhand) is about ___________________?
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A. 5 to 10

B. 1 to 5

C. 15 to 25

D. 0.1 to 0.5
1647. Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?
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A. K ?D

B. K ??D

C. K ?D1.5

D. K ?D2

1648. The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ?
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A. Increases

B. Remains unchanged

C. Decreases

D. May increase or decrease, depends on the system

1649. Which of the following processes is not an example of adsorption applied to gaseous separations ?
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A. Dehumidification of air and gas

B. Decolouration of yellow glycerine

C. Removal of objectionable odour and impurities from industrial gases

D. Recovery of valuable solvent vapors from dilute mixture with air and other gases

1650. Zeolite used in water softening process (cation exchange) is regenerated by washing with___________________?
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A. Liquid chlorines

B. Chloramines

C. Brine

D. Sodium bisulphite

1651. Which of the following parameters remains constant during chemical dehumidification ?
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A. Dry bulb temperature

B. None of these

C. Wet bulb temperature

D. Partial pressure of vapour

1652. Coal tar is used as a___________________?
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A. Fuel in rotary kiln

B. All A , B. and C.

C. Binder in making carbon electrodes

D. Binding material for coal briquettes

1653. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?
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A. L/(FG . G)

B. (G . a)/FG

C. FG/(G . a)

D. G/(FG . a)
1654. The critical moisture content in case of drying indicates the ________________ rate period?
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A. End of falling

B. Beginning of falling

C. Beginning of constant

D. None of these

1655. Common salt is generally not produced commonly by ________________ method from brine ?
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A. Electrolytic

B. Freeze drying

C. Solar evaporation

D. Vacuum evaporation

1656. To remove all the moisture from a wet solid it requires exposure to _____________ air?
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A. High temperature

B. Perfectly dry

C. Highly humid

D. None of these

1657. Washing soda is chemically represented by _________________?
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A. Na2CO3.H2O

B. NaHCO3

C. Na2CO3.10H2O

D. Na2CO3

1658. Bakelite is _________________?
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A. An inorganic polymer

B. Not a polymer

C. Same as Polytetrafluoroethylene (PTFE)

D. Same as thermosetting phenol-formaldehyde
1659. pertaining to the analogy between equations of heat and mass transfer operations ?
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A. k out the wrong statement

1660. Phthalic anhydride is made by the ______________________?
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A. Dehydrogenation of ethyl benzene

B. None of these

C. Oxidation of naphthalene

D. Oxidation of benzene