chemical engineering materials and construction MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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
401. As the impurities are oxidised, the melting point of iron___________________?
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A. Decreases

B. Increases

C. Remains unchanged

D. May increase or decrease; unpredictable

402. Polythene (low or high density) containers are not corroded by___________________?
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A. Sulphuric acid (10%) at room temperature

B. Any of these

C. Nitric acid (95%) at room temperature

D. Sulphur trioxide at 60C

403. Thermoplastic resins are those polymers, which____________________?
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A. Cannot be moulded

B. Has decreased plasticity at increasing temperature

C. Easily deform under pressure at high temperature

D. None of these

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

B. 0.015

C. 0.055

D. 0.805

405. Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
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A. Dilute HCl

B. Acetic acid

C. None of these

D. Concentrated H2SO4

406. Softening of hardened steel is done by its_____________________?
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A. Annealing

B. Carburising

C. Normalising

D. Tempering
407. Post weld heat treatment is done by____________________?
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A. Tempering

B. Normalising

C. Solution annealing

D. Stress relieving
408. Centrifugal pump made of pyrex or glass cant be used to pump___________________?
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A. Alkaline solutions

B. Dilute H2SO4 at room temperature

C. Milk and fruit juices

D. Brine

409. Presence of cobalt in steel improves its____________________?
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A. Cutting ability

B. Corrosion resistance

C. None of these

D. Tensile strength

410. Tin in its pure form is used for making_______________?
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A. Cans for food packing

B. Foil for wrapping cheese

C. Collapsible tubes for toilet preparations

D. All A., B. and C.
411. Which of the following finds the least commercial use ?
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A. Pure iron

B. High carbon steel

C. High silicon iron

D. Low carbon steel

412. Slow plastic deformation of metals under a constant stress is termed as _____________ failure?
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A. Creep

B. Fatigue

C. None of these

D. Endurance

413. Teflon (PTFE) is corroded by_______________?
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A. Hydrochloric acid (95%)

B. None of these

C. Hydrochloric acid (10%)

D. Sulphuric acid

414. Common house hold glass (i.e., soda-lime glass) is a/an _____________ material?
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A. Amorphous

B. Partly crystalline

C. None of these

D. Fully crystalline

415. Which of the following is not shipped in mild steel containers ?
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A. Ammonia

B. Acetone

C. Ethyl alcohol

D. Formic acid
416. Which of the following crystal structures characterises the ferritic stainless stee l?
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A. Simple hexagonal

B. None of these

C. Body centred cubic

D. Face centred cubic

417. Ferric stainless steels compared to austenitic stainless steels________________?
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A. Have lower corrosion resistance

B. Are harder to fabricate

C. Are less ductile and hence less suitable for cold pressing

D. All A., B. and C.
418. How many molecules per unit cell are there in a face centred cubic lattice ?
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A. 4

B. 2

C. 6

D. 8

419. Mild steel storage vessels are suitable for the storage of___________________?
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A. Fatty acids

B. Hydrochloric acid (95%)

C. Sulphuric acid (25%)

D. Anhydrous ammonia
420. Which has the maximum melting point out of the following ?
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A. Cast iron

B. Wrought iron

C. Stainless steel

D. Steel