chemical engineering MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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

281. Annealing of white cast iron produces _____________________ iron?
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A. Grey

B. Malleable

C. Spheroidal

D. Nodular

282. Out of the following, which will fracture most readity, when hit with a hard hammer ?
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A. Cast iron

B. Brass

C. German silver

D. Bronze

283. _______________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten ?
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A. Alnico

B. Stellite

C. High speed steel

D. Cermet

284. Sudden fall of atmospheric pressure by a large amount is an indication of the_____________________?
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A. Rain

B. Cold wave

C. Fair weather

D. Storm

285. Baffles provided on the shell side of a shell and tube heat exchanger are meant for _____________________?
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A. Providing support for the tubes

B. Improving heat transfer

C. Both A & B

D. Preventing the fouling of tubes & stagnation of shell side fluid

286. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
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A. 12-Jun

B. 18-20

C. 15-Dec

D. 2-5

287. The hardenability of steel decreases with__________________?
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A. Decrease in grain size

B. Increase in solutionising temperature

C. Increase in strength

D. Decrease in dislocation density

288. Wavelength of radiation emitted by a body depends on the ________________ of its surface?
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A. Nature

B. Area

C. All A, B & C

D. Temperature

289. Dielectric___________________?
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A. Need not defy the corrosive action of chemicals

B. Of low resistivity is preferred

C. Is an electrical insulating material

D. Should have high thermal conductivity

290. In a neutral solution__________________?
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A. H+ ions are absent

B. OH- ions are absent

C. Both H+ and OH- ions are present in very small but equal concentration

D. None of these

291. Dephosphorization of molten pig iron is favoured by_______________________?
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A. Oxidising and basic slag

B. Oxidising and neutral slag

C. High activity co-efficient of phosphorous in metal

D. Reducing and basic slag

292. The dimensional formula of bulk modulus of elasticity is same as that of the ____________________?
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A. None of these

B. Pressure

C. Force

D. Density

293. Elimination of brittleness resulting from welding of saw blades is done by __________________ of the welded portion ?
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A. Tempering

B. Annealing

C. Work hardening

D. Toughening

294. Out of the following, the ________________ pipe has the least corrosion resistance?
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A. Copper

B. Mild steel

C. Cast iron

D. Wrought iron

295. Lead is poured into the joints between two ___________________ pipes?
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A. Steel

B. Cast iron

C. Concrete

D. Plastic

296. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element ?
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A. Carbon

B. Silicon

C. Chromium

D. Phosphorous

297. Ice point is designated on Fahrenheit temperature scale by__________________?
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A. 0

B. 32

C. 212

D. 62

298. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poissons ratio of the rod is___________________?
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A. 0.44

B. 0.33

C. 0

D. 0.25

299. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot_____________________?
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A. Spinning

B. Drawing

C. Piercing

D. Extrusion

300. The starting of a car takes time in winter, because the__________________?
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A. Octane number of fuel is decreased

B. Vaporisation of the fuel is decreased

C. Pour point of fuel decreases

D. Fuel supply for ignition is not sufficient

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