chemical engineering MCQs – Page 219

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 Review each marked answer and report any item that may be outdated or unclear.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

4361. Mechanical recompression evaporation is used in the production of____________________?
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A. Alcohol

B. Fruits jam

C. Distilled water

D. Salt

4362. LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?
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A. 1

B. 0

C. < 1

D. > 1

4363. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________?
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A. Spalling resistance

B. None of these

C. Refractoriness under load (RUL)

D. Refractoriness

4364. Which of the following is the Clausius-Clapeyron Equation ?
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A. PV = RT + B/V + y/V2 + .

B. p = [RT/(V b)] (a/TV2)

C. loge (p/p0) = (?/R) (1/T0 1/T)

D. (P + a/V2)(V-b) = RT

4365. Othmer chart is useful in estimating the heat of_______________?
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A. Mixing

B. Adsorption

C. None of these

D. Wetting

4366. The energy radiated from a surface Q at absolute temperature T is related as__________________?
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A. Q ? T2

B. Q ? T4

C. Q ? T3

D. None of these

4367. Latent heat absorbed by 1 lb of water at 212F, when it is changed to steam at 212F, may be around ______________ BTU?
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A. 180

B. None of these

C. 970

D. 3.97

4368. Silica bricks are never used for lining the_________________?
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A. By-product coke ovens

B. Roof of open hearth furnace

C. Dome of blast furnace stoves

D. Beehive coke ovens

4369. Outer combustion chamber of blast furnace stove is lined with _______________ bricks?
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A. Chrome magnesite

B. Silica

C. Fireclay

D. Zirconia

4370. Baffle spacing ____________________?
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A. None of these

B. Should be less than the inside diameter of the shell

C. Should be less than one fifth the diameter of the shell

D. Is not the same as baffle pitch

4371. Pick out the wrong statement pertaining to the design of a basket type evaporator ?
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A. There is no central downtake

B. It is used for high viscosity liquor having large rate of scaling

C. The tube bundle is suspended on bracket

D. Downtake is formed by the annular space between the bundle and the shell

4372. Water content in ground refractory material to be shaped into bricks by hand moulding is about _____________ percent?
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A. 5

B. 55

C. 40

D. 20

4373. 2 litres of nitrogen at N.T.P. weighs ______________ gms ?
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A. 2.5

B. 1.25

C. 14

D. 28

4374. Pick out the wrong statement about the design of a sieve plate column ?
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A. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns

B. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design

C. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns

D. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds

4375. Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?
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A. Be = (400/G) 400

B. Be = 200(G-1)

C. Be = 145 (145/G)

D. Be = (140/G) 130

4376. _______________ paint has the maximum absorption coefficient ?
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A. Yellow

B. Black

C. White

D. Grey

4377. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
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A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap

C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features

D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range

4378. How many phases are present at eutectic point ?
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A. 1

B. 2

C. unpredictable

D. 3

4379. Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_____________________?
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A. A2 is more alkaline than solution A2

B. A1 is highly acidic

C. A1 is very slightly acidic

D. Both A. & C.

4380. Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?
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A. Thin walled having the value of Ao Ai/< 2