chemical engineering chemical engineering basics MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
341. Thermit welding uses the following energy source ?
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A. Heat generated by friction

B. Energy of high velocity electrons

C. Chemical energy

D. Electrical energy

342. 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

343. Photographic plates are coated with _____________________?
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A. Calcium silicate

B. Silver nitrate

C. Silver halide

D. Metallic silver

344. Chromium molybdenum steel cannot be welded using ______________ welding ?
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A. Any of these

B. Oxy-acetylene

C. Electrical resistance

D. Thermit

345. Heat release during phase change is observed in case of a/an_________________?
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A. Condenser

B. Boiler

C. Evaporator

D. All A. B. & C.

346. With increase in impurities in metals, their corrosion resistances____________________?
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A. Remain same

B. May increase or decrease; depending on the type of metal

C. Increase

D. Decrease
347. Which of the following forces does not act on a fluid at rest ?
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A. Surface tension force

B. Hydrostatic force

C. Gravity force

D. Viscous force
348. Drossing is a _______________________ operation?
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A. Dressing

B. Roasting

C. Dressing

D. Smelting

349. Thermodynamic cycle involved in the working of a thermal power plant is the ______________ cycle ?
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A. Joule

B. Carnot

C. Brayton

D. Rankine
350. A material is capable of resisting softening at high temperature, because of its property termed as____________________?
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A. Fatigue

B. Hot hardness

C. Hot temper

D. Creep

351. _______________ number determines whether the fluid flow in an open channel is super-critical, critical or sub-critical ?
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A. Mach

B. Weber

C. Froude

D. Reynolds

352. Satellite is a _________________ material?
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A. Ferrous

B. Ceramic

C. Cemented carbide

D. Non-ferrous cast alloy cutting tool
353. Tempering of a material does not improve its____________________?
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A. Machinability

B. Internal stress level

C. Toughness

D. Softness

354. The hardenability of steel decreases with__________________?
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A. Decrease in dislocation density

B. Increase in strength

C. Increase in solutionising temperature

D. Decrease in grain size
355. A 2 kg object weighs 1.8 kgf on a spring balance. The value of g at that location in m/sec2 is___________________?
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A. 8.82

B. 10.88

C. 0.95

D. 9.81

356. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?
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A. Diameter of the pipe

B. Density of the fluid

C. Length of the pipe

D. Velocity of the fluid

357. Iron content in Indian iron ore is about _________________ percent?
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A. 80-85

B. 40-45

C. 20-25

D. 60-65
358. Lead pencil contains____________________?
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A. Graphite

B. Lead sulphide

C. Lead

D. Both B. & C.

359. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?
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A. Saturation

B. Dew point

C. Dry bulb

D. Wet bulb
360. Alloys having more than 80% copper are generally more______________________?
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A. Machinable

B. Corrosion resistant

C. Prone to season cracking

D. Abrasion resistant