chemical engineering materials and construction MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering materials and construction Mcqs
221. Percentage elongation of a material is a measure of its _______________________?
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A. Ductility

B. Toughness

C. Brittleness

D. Malleability

222. Spray dryer for evaporating milk to produce milk powder is made of_________________?
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A. Aluminium

B. Stainless steel

C. Cast iron

D. Lead lined steel

223. Purity of electrical grade aluminium should be ? _____________ percent?
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A. 95

B. 90

C. 99.5

D. 85

224. Babbitt metals used for making bearings are _________________?
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A. Tin or lead based alloys

B. Yellow metals

C. Having homogenous microstructure

D. Short of antifrictional properties

225. Which of the following has the highest density and the lowest melting point ?
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A. Stainless steel

B. Aluminium

C. Lead

D. Titanium

226. Which of the following is the easiest to bend ?
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A. Stainless steel

B. Cast iron

C. Steel

D. Wrought iron
227. The purpose of nitriding the steel is to___________________?
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A. Harden its surface

B. None of these

C. Soften its surface

D. Improve its reliability

228. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
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A. Copper

B. Aluminium

C. Lead

D. Wrought iron

229. Which of the following crystal structures characterises the austenitic stainless steel ?
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A. Simple hexagonal

B. None of these

C. Body centred cubic

D. Face centred cubic
230. Out of the following, copper vessels are the most suitable for the storage of__________________?
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A. Nitric acid (95% and fuming)

B. Dry chlorine & dry fluorine

C. Bromine

D. Phosphoric acid (95%) & sulphuric acid (95% and fuming)

231. Babbitt metal used for making bearings should have_____________________?
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A. High co-efficient of friction between journal and bearing

B. Ability to retain lubricant on its surface

C. Low co-efficient of friction between journal and bearing

D. Both B. & C.

232. Acid proof stoneware_________________?
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A. Is broken by small temperature changes

B. Cannot be heated

C. All A., B. and C.

D. Has very low strength

233. Stainless steel is not corroded by _____________________?
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A. Hydrochloric acid (10%)

B. Nitric acid (10%)

C. Sulphuric acid (10%)

D. Saturated brine

234. The main purpose of galvanising iron sheets is to___________________?
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A. Increase its glossiness and lustre

B. Harden the surface

C. Prevent the action of water

D. Prevent the action of oxygen

235. ______________ can replace tungsten in high speed steel ?
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A. Chromium

B. Molybdenum

C. Cobalt

D. Vanadium

236. A hardened steel essentially contains___________________?
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A. Sorbite

B. Troostite

C. None of these

D. Martensite
237. In a plate type heat exchanger, heat transfer plates are never made of _________________?
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A. Hastelloy C

B. Cast iron

C. Stainless steel

D. Titanium

238. Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of ______________ as mercury does not amalgamate with it?
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A. Stainless steel

B. Monel

C. Copper

D. Copper alloys

239. The most commonly used resin for making reinforced plastic is___________________?
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A. Polyurethane

B. Unsaturated polyester

C. Nylon-6

D. Polypropylene

240. Hardening of steel is not possible unless it is heated ______________ critical point?
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A. Above the lowest

B. Between the second & third

C. Between the first & second

D. Above the highest