All Free Chemical Engineering MCQs with Answers

• A. Caustic soda
• B. All A., B. and C.
• C. Hypochlorous acid
• D. Chlorinated brine

Explanation: Rubber linings provide resistance to caustic soda, chlorinated brine and hypochlorous acid, allowing the pump casing to handle these…

• A. Fireclay bricks
• B. Calcium carbide
• C. Silicon carbide
• D. High alumina bricks

Explanation: Silicon carbide is used for ceramic recuperators because it withstands high temperatures, thermal shock and oxidation while retaining good…

• A. For producing zinc base die casting alloys
• B. In its oxide form as pigments
• C. As anode for corrosion prevention in boiler
• D. As an alloying element in various bronzes

Explanation: Zinc is used in die-casting alloys, zinc-oxide pigments and sacrificial anodes for boiler corrosion protection.

• A. Alum
• B. Saturated brine
• C. Sulphuric acid
• D. Ferrous sulphate

Explanation: Concrete tanks are suitable for saturated brine because the salt solution is not strongly acidic.

• A. Resistance to brittleness
• B. Ductility
• C. Shock resistance
• D. Compressive strength

Explanation: Cast iron withstands very high compressive loads because its graphite-rich structure resists squeezing.

• A. Duralumin
• B. Hastelloy
• C. Nimonic alloys
• D. Inconel

Explanation: Duralumin is an aluminium-copper alloy, not a nickel-chromium alloy. Inconel, Hastelloy and Nimonic alloys are nickel-based alloys…

• A. Nickel
• B. Cobalt
• C. Tungsten
• D. Chromium

Explanation: Cobalt raises the retentivity, or residual magnetism, of steel and is therefore used in permanent-magnet alloys.

• A. Mild steel
• B. Cast iron
• C. Refractory blocks
• D. Stainless steel

Explanation: A glass tank furnace must withstand very high temperatures and attack by molten glass, so its basin and walls are built from refractory…

• A. None of these
• B. Soften its surface
• C. Improve its reliability
• D. Harden its surface

Explanation: Nitriding diffuses nitrogen into the steel surface to form hard alloy nitrides, producing a hard, wear-resistant case.

• A. Galvanising
• B. Alloying
• C. Utensil manufacture
• D. Electrical industry

Explanation: Galvanising consumes the largest share of zinc because steel sheets, pipes and structural parts are coated with zinc to prevent corrosion.

• A. Simple hexagonal
• B. Body centred cubic
• C. Face centred cubic
• D. None of these

Explanation: Austenitic stainless steels have a face-centred cubic structure, which gives them high ductility and good formability.

• A. Rubber
• B. Monel
• C. Nickel
• D. Glass

Explanation: Deep-fermentation penicillin broths are handled in glass-lined steel vessels because the glass surface resists corrosion and contamination…

• A. Monel
• B. Duriron
• C. Hastelloy
• D. Inconel

Explanation: Monel is primarily an alloy of nickel and copper, valued for its strength and resistance to seawater and many corrosive chemicals.

• A. Inconel
• B. Babbitt metal
• C. Nimonics
• D. Hastelloys

Explanation: Babbitt metal is generally a tin- or lead-based bearing alloy containing antimony and copper, so it is not nickel-based.

• A. Is in the form of free Si
• B. Decreases the blow holes formation tendency in castings
• C. Indicates that steel is not deoxidised properly
• D. None of these

Explanation: Silicon is commonly added to steel as a deoxidiser, removing dissolved oxygen and thereby reducing carbon-monoxide blowholes during…

• A. High speed
• B. Molybdenum
• C. Silicon
• D. Tungsten

Explanation: Hypersil is a grain-oriented silicon steel used mainly for electrical transformer cores, where its magnetic properties reduce core losses.

• A. Glass, graphite, porcelain & stoneware
• B. Copper, cast iron & high silicon iron (14% Si)
• C. Rubber (butyl and hard), silicone rubber & Teflon
• D. Aluminium, mild steel, stainless steel, concrete & tin

Explanation: Sulfuric acid below about 50% concentration attacks aluminium, mild steel, many stainless steels, concrete, and tin, so these materials…

• A. Low temperature strength properties
• B. High strength to weight ratio
• C. Its ability to be cast, rolled, forged & stamped
• D. High strength and corrosion & oxidation-resistance at elevated temperature

Explanation: Aircraft benefit chiefly from aluminium alloys because they provide substantial strength with very low density.

• A. High ductility
• B. High malleability
• C. Its elastic limit very close to ultimate breaking strength
• D. Very high tensile strength

Explanation: Cast iron is brittle and undergoes very little plastic deformation, so its elastic limit lies close to its failure or ultimate breaking…

• A. Nylon-6
• B. Polypropylene
• C. Polyurethane
• D. Unsaturated polyester

Explanation: Unsaturated polyester resin is the most widely used matrix for reinforced plastics because it is economical, easy to process, and cures…