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

421. With increase in the carbon percentage in the steel, its__________________?
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A. Ductility reduces

B. All A., B. and C.

C. Tensile strength increases

D. Hardness increases

422. Liners of a ball mill are never made of__________________?
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A. Rubber or ceramic material

B. Alloy steel

C. Cast iron

D. Lead
423. A measure of toughness of a material is its________________?
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A. Area under stress-strain diagram

B. Ultimate strength

C. Percentage elongation

D. Yield strength
424. Glass is corroded by________________?
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A. Phosphoric acid

B. None of these

C. Fluorine (dry or wet)

D. Sulphuric acid

425. Which of the following is the most widely used insulating material for steam carrying pipelines ?
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A. Glass wool and 85% magnesia

B. Ceramic fibre blanket

C. Slag wool

D. Vermiculite

426. For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is__________________?
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A. Nickel

B. Aluminium

C. Stainless steel

D. Cast iron
427. Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its ______________________?
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A. Low thermal conductivity

B. All A., B. and C.

C. High corrosion resistance

D. High co-efficient of thermal expansion

428. Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?
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A. Elastic limit

B. Ultimate tensile strength (U.T.S.)

C. None of these

D. Endurance limit
429. Cast iron is__________________?
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A. Manufactured in cupola and is brittle

B. Used for making shock resisting parts

C. All A., B. & C.

D. Having compressive strength more than its tensile strength

430. Tin coating on metals is not done by_____________________?
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A. Hot dipping

B. Powder metallurgy

C. Electro-deposition

D. Spraying

431. The main constituent of carborundum is ___________________ carbide?
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A. Aluminium

B. Calcium

C. Silicon

D. Boron

432. _____________________ is used for determining the tensile strength of steels ?
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A. None of these

B. Mechanical press

C. Universal testing machine

D. Hydraulic press

433. Which of the following has a very high carbide forming tendency in steels ?
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A. Vanadium

B. Nickel

C. Chromium

D. Silicon

434. Metal at the top of the electromotive series is________________?
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A. Most stable

B. Most noble

C. Least active

D. Most active
435. Which of the following undergoes granular fracture ?
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A. None of these

B. Cast iron

C. Steel

D. Wrought iron

436. Mild steel is a/an ______________ steel?
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A. Medium carbon

B. High alloy

C. High carbon

D. Low carbon
437. Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about_______________?
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A. Half

B. One third

C. One fifth

D. One twelfth

438. Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of__________________?
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A. Cast iron

B. Wrought iron

C. Stainless steel or glass lined vessel

D. Karbate

439. Alinco, which is a aluminium-cobalt-nickel steel, is used for making __________________?
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A. Powerful magnets

B. Chemical equipments

C. Boiler tubes

D. Surgical instruments

440. Duriron is__________________?
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A. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal

B. High silicon iron

C. ansion

D. Acid resistant, brittle and very hard

E. All A., B. and C.
441. Gas holder of a gobar (cow-dung) gas plant is made of___________________?
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A. Aluminium

B. Mild steel

C. Tin

D. Molybdenum stainless steel

442. Cast iron is a ______________ material?
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A. Malleable

B. Ductile

C. Tough

D. Brittle
443. Bog iron used for the adsorption of H2S from coke oven gas is___________________?
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A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)

B. None of these

C. Carbon free iron

D. Iron impregnated with resin (usually Bakelite)

444. Coke oven walls are lined with _____________ bricks?
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A. Tar-dolomite

B. Low thermal conductivity

C. Silica

D. Fire clay

445. Muntz metal is a/an alloys of____________________?
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A. Lead & tin

B. Copper & zinc

C. Ferrous material

D. Magnesium & tin

446. The electrical conductivity of a ______________ decreases with rise in temperature?
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A. Dielectric

B. Semi-conductor

C. Metal/alloy

D. None of these

447. Nickel as a material of construction__________________?
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A. Is used as an alloying element for both ferrous & non-ferrous alloys

B. Is paramagnetic below 415 C (its Curie temperature)

C. Diamagnetic

D. Has a body centred cubic (bcc) crystal lattice structure

448. Steel balls for ball bearings are generally made of ______________ steel?
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A. Carbon chrome

B. Free carbon

C. Cast

D. Stainless

449. _______________ is a donor impurity for semi-conductors ?
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A. Gallium

B. Boron

C. None of these

D. Antimony
450. Most of the common metals have ______________ crystal structure?
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A. Cubic

B. Orthorhombic

C. None of these

D. Hexagonal