chemical engineering chemical engineering basics MCQs – Page 19

Practise multiple-choice questions from chemical engineering chemical engineering basics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
361. Diffusion co-efficient of a metal in a solid solution depends upon its ?
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A. Composition

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

362. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
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A. 15-Dec

B. 12-Jun

C. 2-5

D. 18-20

363. In the diving apparatus, helium is used along with oxygen, because it is ____________________?
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A. Lighter than nitrogen

B. Easily available

C. Completely miscible with oxygen

D. Not soluble in blood at high pressure
364. Main constituent of bone ash is____________________?
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A. Ammonium phosphate

B. Ammonium sulphate

C. Calcium phosphate

D. Animal charcoal

365. Use of flux during soldering is done to__________________?
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A. Prevent oxide formation

B. Increase fluidity of solder by lowering its melting temperature

C. Wash away surplus solder

D. Full up the joint gap

366. For the irreversible reaction, Ca+ 2C = Ca C2 , ? H298 = 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?
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A. 2,40,000 J

B. 30,000 J

C. 60,000 J

D. 90,000 J
367. Pearlite comprises of__________________?
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A. 87% cementite & 13% Fe

B. 93.33% ferrite & 6.67% C

C. 87% ferrite & 13% cementite

D. 87% ferrite & 13% C

368. In connection with corrosion of metals, passivation is the process that__________________?
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A. Intensifies deterioration

B. Changes the composition of the metal

C. None of these

D. Inhibits further deterioration
369. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?
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A. Straight line

B. None of these

C. Parabolic

D. Hyperbolic

370. Function of gear box is to____________________?
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A. Obtain variable speed

B. Produce high torque

C. Increase the speed

D. Reduce the speed

371. Glycerine is used as a coolant in cooling of some engines instead of water, because___________________?
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A. Comparatively less weight of coolant is required

B. Its higher boiling point (290C) increases its heat carrying capacity

C. All a, b & c

D. Smaller radiator can be used

372. If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity_________________?
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A. Is trebled

B. Decreases by a factor of 1/3

C. Decreases by a factor of 3

D. Remains unchanged
373. Hardening of steel is not possible, unless it is heated _________________ critical point ?
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A. Between the second & third

B. Above the lowest

C. Above the highest

D. Between the first & second

374. Pressure required to increase the density of water by about 1% is ____________________ atmosphere?
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A. 1000

B. 10

C. 200

D. 50

375. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?
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A. 40

B. 20

C. 10

D. 30

376. Metalloids________________?
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A. Are good conductor of heat & electricity

B. Act as electron donors with metals & as electron acceptor with non-metals

C. Are not necessarily solids at room temperature

D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are

E. mplified by elements like germanium, silicon & boron</strong>

377. Which of the following has the highest value of refractive index ?
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A. Brine (sea water)

B. Diamond

C. Distilled water

D. Glass

378. Annealing of white cast iron produces _____________________ iron?
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A. Malleable

B. Grey

C. Nodular

D. Spheroidal

379. Maximum consumption of limestone is in the ____________________ industry?
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A. Fertiliser

B. Iron and steel

C. Cement

D. Glass

380. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?
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A. Temperature pressure

B. Enthalpy entropy

C. Enthalpy-pressure

D. Temperature entropy