chemical engineering MCQs – Page 313

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 Review each marked answer and report any item that may be outdated or unclear.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
6241. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?
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A. Fireclay

B. Silicon carbide

C. Corundum

D. Siliceous fireclay

6242. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________?
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A. Same in both the tubes

B. Greater in 1 mm dia tube

C. Greater in 0.5 mm dia tube

D. Zero in both the tubes

6243. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?
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A. Increase

B. Decrease

C. Remain same

D. Data insufficient to predict

6244. Pressure drop in a fluidised bed reactor is ______________ that in a similar packed bed reactor?
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A. Less than

B. None of these

C. Greater than

D. Same as

6245. Zirconia refractories are not used in_____________________?
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A. High frequency induction furnaces in the form of inductors

B. Furnaces subjected to fluctuating temperature

C. Making sheaths for thermocouple

D. Lining high temperature ceramic kilns

6246. . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ C?
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A. >1350

B. 500

C. 1000

D. >2000

6247. Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head?
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A. Elevation

B. Pressure

C. Both A. & B.

D. Neither A. nor B.

6248. Pressure drop (?p) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as___________________?
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A. V-0.2

B. V1.8

C. V2.7

D. V2
6249. Super refractories are made from pure____________________?
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A. Oxides

B. Borides

C. Nitrides

D. Carbides

6250. Magnesite refractories have low resistance to___________________?
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A. Attack by basic slag

B. Abrasion

C. Disintegration on sudden change of temperature

D. Both B. and C.
6251. Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?
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A. Df + Bf = Wf

B. None of these

C. Df + Bf + Wf =0

D. Df = Bf + Wf

6252. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?
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A. ractories and hence increased rate of production

B. All A., B. and C.

C. Less addition of water to get a workable plasticity & lesser time required for drying the raw

D. High strength & thermal spalling resistance

E. Less shrinkage in heating, decreased apparent porosity & increased specific gravity

6253. In case of a pipe exit fitted with a nozzle, the____________________?
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A. Conversion of kinetic head to pressure head is facilitated

B. Conversion of pressure head to kinetic head is facilitated

C. Power transmitted through the nozzle is maximum, when the head lost due to friction in the

D. e is equal to one third of the total supply head

E. Both B. and C.
6254. High alumina refractory compared to fireclay bricks have____________________?
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A. Less load bearing capacity

B. Low refractoriness

C. High resistance to thermal shock and creep

D. Less resistance to slag attack

6255. Fusion temperature of pure silica (SiO2) is _______________ C?
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A. 1715

B. 2570

C. 1350

D. 2800

6256. Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
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A. Resistance to carbon monoxide attack

B. Resistance to slag penetration

C. Fusion point

D. Spalling resistance

6257. Lower BWG means _____________ of the tube?
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A. Lower thickness

B. Outer diameter

C. Lower cross-section

D. Inner diameter

6258. Which is not a high alumina refractory ?
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A. Corundum

B. Mullite

C. Dolomite

D. Bauxite

6259. Critical velocity in a pipe flow_________________?
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A. Increases as pipe diameter increases

B. Increases as fluid viscosity increases

C. Independent of fluid density

D. None of these

6260. Vacuum steel degassing units are lined with__________________?
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A. Silica bricks

B. High alumina bricks

C. Graphite blocks

D. Low duty firebricks