chemical engineering MCQs – Page 116

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 Review each marked answer and report any item that may be outdated or unclear.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
2301. With increase in the capacity of screens, the screen effectiveness__________________?
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A. Increases

B. Decreases

C. Decreases exponentially

D. Remains unchanged

2302. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?
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A. Increases with increase in

B. Is one at unity value of

C. Both A. and B.

D. Neither A. nor B.

2303. During the washing of cake_________________?
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A. All the resistances are constant

B. Cake resistance decreases

C. Filter medium resistance decreases

D. Filter medium resistance increases

2304. Which of the following is used for primary crushing of very hard lumpy materials ?
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A. Gyratory crusher

B. Ball mill

C. Toothed roll crusher

D. Tube mill

2305. In case of absorption with exothermic reaction, for fluids having ___________________?
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A. Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change

B. the degree of turbulence

C. Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same

D. Both A. and B.

E. Pr = Sc; there wont be any change in heat and mass transfer flux with changes in degree of

F. bulence

2306. To remove dirt from the flowing fluid, we use a ____________________?
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A. Gravity settler

B. Coagulant

C. Strains

D. Clarifier

2307. Screen capacity is expressed in terms of____________________?
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A. tons/hr

B. tons/ft2

C. Both A. & B.

D. tons/hr-ft2
2308. Separation of isotopes is generally done using a/an _______________ centrifuge?
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A. Ultra

B. Disk-bowl

C. Both A. & B.

D. Neither A. nor B.

2309. The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is_______________?
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A. 1.5

B. ?3

C. 2

D. ?2
2310. Occurrence of case hardening during drying of a high moisture solid cake _______________ the drying rate?
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A. Exponentially increases

B. Does not affect

C. Increases

D. Decreases
2311. Tube mill compared to ball mill_______________________?
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A. Produces finer products

B. Uses smaller balls

C. Is long in comparison with its diameter

D. All A., B. & C.
2312. When the temperature and humidity of air is low, we usually use _______________ draft cooling tower?
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A. None of these

B. Natural

C. Induced

D. Forced

2313. Which of the following equations is Rittingers crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D? sa & D? sb = volume surface mean diameter of feed & product respectively) ?
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A. P/m = K/ ?Dp

B. P/m = K . ln D? sa/D? sb

C. P/m = K . (1/ D? sb 1/D? sa)

D. None of these

2314. The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________?
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A. N1

B. N2

C. N

D. N3

2315. Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1F is called the________________?
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A. Specific heat

B. Humid heat

C. Sensible heat

D. Latent heat

2316. If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________?
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A. G/L

B. Always < 1

C. None of these

D. L/G
2317. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the __________________?
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A. Centrifugation

B. Sedimentation

C. Flocculation

D. Dispersion

2318. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?
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A. Kozeny-Carman equation

B. None of these

C. Levas equation

D. Blake-Plummer equation

2319. There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?
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A. Tabling

B. Froth floatation

C. Jigging

D. Classification

2320. The filtrate flow rate in constant pressure filtration___________________?
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A. Continuously decreases

B. Continuously increases

C. Remain constant throughout

D. May increase or decrease; depends on the pressure