chemical engineering MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
341. Plasma is_____________________?
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A. A high temperature neutral gas

B. A source of steady and highest controllable pressure

C. Formed at very low temperature

D. Nothing but ionised gas
342. Out of the following, the joint produced by ______________ has the lowest strength?
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A. Brazing

B. Riveting

C. Soldering

D. Welding

343. Maximum permissible sulphur content in steel is ______________ percent ?
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A. 0.505

B. 0.015

C. 0.055

D. 0.805

344. Auto collimator is used to check____________________?
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A. Flatness

B. Rotor balancing

C. Roughness

D. Angle
345. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an ______________ body?
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A. Grey

B. Opaque

C. White

D. Black

346. Fire refining process is employed in case of___________________?
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A. Aluminium

B. Tin

C. Copper

D. Zinc

347. Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ?
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A. A, C, B, D

B. D, A, B, C

C. D, C, B, A

D. D, B, C, A
348. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?
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A. 3-Jan

B. 0.5

C. 1

D. 2.5
349. In chemical dehumidification of air___________________?
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A. Both specific humidity & dry bulb temperature increases

B. Both specific humidity & dry bulb temperature decreases

C. Specific humidity decreases & dry bulb temperature increases

D. Specific humidity increases & dry bulb temperature decreases

350. Case hardening of a material is__________________?
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A. Carried out to get extreme hardness in its core

B. Done to get a soft ductile interior with a very hard surface

C. Preceded by its tempering

D. Followed by tempering or carburising

351. The best lubricants for a machine working at high temperature & load is_________________?
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A. Mineral oils

B. Grease

C. Solid lubricant

D. Animal oils

352. Recrystallisation temperature of steel is ______________________ C?
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A. 50

B. 800

C. 300

D. 500

353. Addition of _____________________ to steel does not impart hardness?
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A. Copper

B. Silicon

C. Chromium

D. Nickel

354. For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
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A. Fractional distillation

B. Filtration

C. Chromatography

D. Evaporation

355. In the blast furnace, incorporation of water vapour in the blast gives the following effect ?
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A. Increases the hydrogen content in the metal

B. Increases the flame temperature

C. No significant change occurs

D. Increases the reducing potential of the gas
356. The most important consideration in value engineering is the_____________________?
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A. Process improvement

B. Cost reduction

C. Profit maximisation

D. Customer satisfaction
357. Pressure required to increase the density of water by about 1% is ____________________ atmosphere?
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A. 10

B. 50

C. 1000

D. 200
358. As the fluid flow rate increases, the float of the Rotameter____________________?
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A. Drops down in the tube

B. Rises in the tube

C. Rotates at lower speed

D. Rotates at higher speed

359. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?
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A. Nitrogen oxides

B. Hydrocarbons

C. Both A. & B.

D. Carbon monoxide

360. Tin based white metals are used, where bearings are subjected to___________________?
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A. High temperature

B. Low pressure & load

C. Large surface wear

D. High pressure & load