chemical engineering MCQs – Page 107

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 Review each marked answer and report any item that may be outdated or unclear.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

2121. Which of the following is not a continuous drier ?
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A. Drum drier

B. Tunnel drier

C. Spray drier

D. Tray drier

2122. For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_____________________?
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A. Increase

B. Data insufficient, cant be predicted

C. Decrease

D. Remain same

2123. Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent ______________________?
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A. A ternary mixture

B. Partially miscible ternary system

C. A binary mixture

D. A pure component

2124. Which of the following quantities need not be fixed before starting the design of a cocurrent absorber ?
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A. None of these

B. Flow rate of entering liquid

C. Heat gain or loss

D. Flow rate of gas

2125. An example of elution is______________________?
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A. Recovery of vegetable oils from seeds

B. Separation of sugar from sugar beet by hot water

C. Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank

D. Dissolution of tannin out of tree barks by water

2126. A good solvent used for absorption should not have very high____________________?
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A. Vapor pressure

B. Viscosity

C. All A., B. & C.

D. Freezing point

2127. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively ?
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A. [xD/(RD + 1)], [RD/(RD + 1)]

B. [RD/(RD + 1)], [xD/(xD + 1)]

C. None of these

D. [xD/(RD + 1)], [(RD + 1)/RD]

2128. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoults law is obeyed, then changing the feed composition would effect ?
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A. The fraction vaporised but not the product composition

B. Neither the product composition nor the fraction vaporised

C. The product composition but not the fraction vaporised

D. The product composition as well as the fraction vaporised

2129. Pick out the wrong statement ?
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A. Freeze drying is used for the drying of fish

B. brane is called dialysis

C. Reboiler is not used in open steam distillation

D. Fenske-Underwood equation is used for calculating theoretical number of plates in a

E. tillation column at normal operating reflux condition</strong>

F. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable

2130. In a counter-current liquid extractor___________________?
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A. Both liquids flow at fixed rate

B. Both liquids can have any desired flow rate

C. Only one of the liquids may be pumped at any desired rate

D. Liquids flow rate depends upon the temperature and pressure

2131. Which of the following binary systems is an example of a maximum boiling azeotrope ?
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A. Acetone-carbon disulphide

B. n-heptane-n-octane

C. Water-ethyl alcohol

D. Water-hydrochloric acid

2132. An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is ?
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A. 4.605

B. 9.21

C. 100

D. 0.001

2133. Pick out the correct statement ?
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A. Solvent used in extractive distillation should be of high volatility

B. Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the

C. A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn

D. tillation</strong>

E. Flash distillation is suitable for separating components which have very close boiling

F. ber of theoretical stages required for the separation of non-ideal binary system by

2134. The dimension of diffusivity is same as that of the__________________?
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A. Kinematic viscosity

B. dimension of diffusivity is same as that of the

C. Molal concentration

D. Velocity head

E. Density

2135. Total reflux in a distillation operation requires minimum____________________?
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A. Condenser load

B. Reboiler load

C. All A., B. and C.

D. Number of plates

2136. Liquid diffusivity is of the order of _______________ cm2 /second?
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A. 10-5 to 10-6

B. 0.01

C. 0.1

D. > 1

2137. Which of the following plays an important role in problems of simultaneous heat and mass transfer ?
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A. Lewis number

B. Sherwood number

C. Prandtl number

D. Schmidt number

2138. Low viscosity absorbent is preferred for reasons of ____________________?
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A. All A., B. and C.

B. Rapid absorption rates and good heat transfer characteristics

C. Low pressure drop on pumping

D. Improved flooding characteristics

2139. When the liquid over a plate is of uniform concentration, then ______________________?
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A. Murphree efficiency < point efficiency

B. Murphree efficiency > point efficiency

C. Murphree efficiency ? point efficiency

D. Murphree efficiency = point efficiency

2140. Which of the following assumes constant molal vaporisation and overflow ?
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A. Ponchan-Savarit method

B. McCabe-Thiele method

C. Enthalpy concentration method

D. Plate absorption column

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