All Free Chemical Engineering MCQs with Answers

• A. Metalloy
• B. Non-crystalline ceramics
• C. Pellets
• D. Cermets

Explanation: A cermet combines a ceramic phase with a metallic binder, giving ceramic hardness and improved toughness from the metal.

• A. Concrete
• B. Steel
• C. Cadmium
• D. Zircaloy

Explanation: Concrete is used as the biological shield because its large thickness and density attenuate neutron and gamma radiation effectively.

• A. Decreases
• B. Increases
• C. Remains unchanged
• D. May increase or decrease; unpredictable

Explanation: Oxidising impurities such as carbon, silicon and manganese removes elements that generally depress iron's melting or liquidus temperature.

• A. Normalising
• B. Spheroidising
• C. Case hardening
• D. Annealing

Explanation: Nitriding diffuses nitrogen into the steel surface to form hard nitrides, producing a hard wear-resistant case while retaining a tougher…

• A. Lead
• B. Silver
• C. Tin
• D. Zinc

Explanation: German silver is a copper-nickel-zinc alloy and contains no actual silver despite its name.

• A. High silicon iron
• B. Pure iron
• C. Low carbon steel
• D. High carbon steel

Explanation: Pure iron is soft, relatively weak and prone to rust, so it has little direct commercial use compared with steels and useful iron alloys.

• A. Nickel clad steel
• B. Stainless steel or glass lined steel
• C. High silicon cast iron
• D. Aluminium

Explanation: SBR polymerisation equipment commonly uses stainless steel or glass-lined steel because the reactor contents and additives can be…

• A. Pewter metal
• B. White metal
• C. Solder
• D. Bronzes

Explanation: Solder is the largest-volume consumer of tin among the listed alloys, particularly in electrical, plumbing and joining applications.

• A. Is desirable
• B. Increases its strength
• C. Increases its hardness
• D. Makes it brittle

Explanation: Nitrogen can cause strain ageing and embrittlement in steel by pinning dislocations, especially when present as a free interstitial…

• A. Strain ageing
• B. Screw dislocation
• C. Solid solution hardening
• D. Twinning

Explanation: Strain ageing occurs when a cold-worked material is heated moderately, allowing interstitial atoms such as carbon or nitrogen to lock…

• A. 5
• B. 100
• C. 250
• D. 500

Explanation: Induction hardening heats only the surface rapidly by electromagnetic induction and then quenches it, so a hardened depth of about 3 mm…

• A. Hardness
• B. Strength
• C. Susceptibility to changes in its properties by heat treatment
• D. Corrosion resistance

Explanation: Wrought iron contains very little carbon and its fibrous slag structure gives it good resistance to atmospheric corrosion.

• A. High alumina & high magnesia
• B. Silica
• C. Lead
• D. Fireclay

Explanation: Cement-kiln linings face high temperature, abrasion and attack by basic clinker materials, so durable high-alumina and high-magnesia…

• A. Normalising
• B. Stress relieving
• C. Tempering
• D. Solution annealing

Explanation: Post-weld heat treatment commonly means stress relieving, in which the welded component is heated below the transformation range and…

• A. Converted to a fine powder
• B. Reduced
• C. None of these
• D. Oxidised

Explanation: Rusting involves iron reacting with oxygen and water to form hydrated iron oxides, so iron loses electrons and is oxidised.

• A. Either B. or C.
• B. Nickel
• C. Neoprene
• D. Glass

Explanation: Nickel resists attack by concentrated caustic soda, while neoprene provides a chemically resistant lining for handling alkaline solutions.

• A. Boron
• B. Antimony
• C. Gallium
• D. None of these

Explanation: Antimony is a Group V element with five valence electrons, so when added to a Group IV semiconductor such as silicon it supplies an extra…

• A. Ultimate
• B. Yield point
• C. Proof
• D. None of these

Explanation: When no sharp yield point appears, the proof stress is defined as the stress producing a specified permanent strain, commonly 0.2%.

• A. 2
• B. 4
• C. 6
• D. 8

Explanation: In a face-centred cubic unit cell, eight corner atoms contribute 1 atom in total and six face-centred atoms contribute 3 atoms, giving 4…

• A. Produced by adding 10-20% steel to the cupola charge
• B. Both A. and B.
• C. Stronger than cast iron
• D. Neither A. nor B.

Explanation: Semi-steel is made by adding steel scrap, commonly about 10–20%, to the cupola charge.