chemical engineering MCQs – Page 110

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 Review each marked answer and report any item that may be outdated or unclear.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
2181. Dryer widely used in a textile industry is ______________ dryer?
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A. Tunnel

B. Festoon

C. Conveyor

D. Cylinder

2182. The caking of crystals can be prevented by _____________________?
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A. Maintaining high critical humidity

B. Maintaining low critical humidity

C. Coating the product with inert material

D. Both A. and C.
2183. The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the ______________ temperature?
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A. Wet bulb

B. Dry bulb

C. None of these

D. Dew point

2184. _______________ columns are used for liquid dispersion in a continuous gas phase ?
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A. Packed

B. Bubble cap

C. Pulse

D. Sieve plate

2185. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________?
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A. None of these

B. +ve

C. #NAME?

D. Zero

2186. Gaseous diffusion co-efficient increases with increase in the_____________________?
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A. Pressure

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

2187. In McCabe-Thiele method, at infinite reflux ratio________________?
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A. The overhead product is minimum

B. Both the operating lines coincide with diagonal

C. Both A. and B.

D. Neither A. nor B.

2188. Extraction of penicillin employs a ________________ extraction column?
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A. Plate

B. Packed

C. Centrifugal

D. None of these

2189. Molecular sieves are porous____________________?
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A. Alumina

B. Synthetic zeolites crystals/metal alumino-silicates

C. Silica

D. None of these

2190. Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?
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A. Evaporation

B. All A., B. & C.

C. Blowdown

D. Entrainment

2191. Under conditions of flooding in packed tower, the gas pressure drop___________________?
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A. Remain constant

B. Is maximum

C. Decreases rapidly

D. Increases rapidly

2192. Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around _____________ inches?
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A. 30

B. 5

C. 100

D. 60

2193. In case of a desorber (stripper), the________________?
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A. Temperature remains unaffected

B. Temperature always increases

C. Operating line always lies below the equilibrium curve

D. Operating line always lies above the equilibrium curve

2194. What is the reflux ratio at total reflux ?
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A. Data insufficient

B. Unity

C. Zero

D. Infinity
2195. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?
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A. LG/m

B. mL/G

C. G/mL

D. L/mG
2196. Nitrobenzene (boiling point = 210.6C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off _______________ C?
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A. Between 100 and 210

B. At < 100

C. At > 210.6

D. None of these

2197. Which of these columns incurs the lowest pressure drop ?
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A. Bubble plate column

B. Pulse column

C. Packed column (with dumped packing)

D. Packed column (with stacked packing)
2198. Raoults law applies to the___________________?
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A. Solvents

B. Non-ideal solution only

C. All liquid solutions

D. Non-volatile solute

2199. On addition of solute in the solvent, the ______________ of the solution decreases ?
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A. Boiling point

B. Freezing point

C. Vapour pressure

D. Both B. and C.
2200. (NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?
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A. Momentum diffusivity

B. Stanton number

C. Peclet number

D. Thermal diffusivity