All Free Chemical Engineering MCQs with Answers

• A. Sulphuric acid (10%)
• B. Both B. and C.
• C. Ether
• D. Sulphuric acid (95%)

Explanation: Silicone rubber withstands dilute sulphuric acid reasonably well, but concentrated 95% acid and ether can attack or swell it.

• A. Glass
• B. High silicon cast iron
• C. Glass lined steel
• D. Porcelain

Explanation: Penicillin fermentation requires a sterile, corrosion-resistant vessel that can withstand repeated steam sterilisation, making glass-lined…

• A. Normalising
• B. Tempering
• C. Artificial ageing
• D. Solution annealing

Explanation: Cold forming introduces work hardening and residual stresses into steel, and solution annealing removes these effects while restoring a…

• A. Monel
• B. High silicon cast iron
• C. Karbate
• D. None of these

Explanation: Monel, a nickel-copper alloy, has excellent resistance to concentrated alkaline solutions such as 50% caustic soda.

• A. Hydrochloric acid (10%)
• B. Sulphuric acid (10%)
• C. Nitric acid (10%)
• D. Saturated brine

Explanation: Stainless steel is strongly resistant to oxidising nitric acid because its chromium-rich passive film is maintained in that environment.

• A. Electronic valves
• B. Connecting rod
• C. Turbine blades
• D. Boiler plates, rivets etc.

Explanation: Low-nickel steel has improved strength, toughness and resistance to atmospheric corrosion, making it suitable for boiler plates, rivets…

• A. 1.5 to 2
• B. 0.4 to 0.7
• C. 0.8 to 1.5
• D. 0.1 to 0.35

Explanation: Low-carbon steel generally contains about 0.05 to 0.30% carbon, so 0.1 to 0.35% is the closest listed range.

• A. Monel metal
• B. Hastelloy
• C. German silver
• D. Inconel

Explanation: Monel is a nickel-copper alloy, commonly containing roughly two-thirds nickel and one-third copper, with excellent corrosion resistance.

• A. Nickel
• B. Copper
• C. Stainless steel
• D. Brass

Explanation: Copper tubes were traditionally used in multiple-effect evaporators for sugar-cane juice because copper has good thermal conductivity and…

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

Explanation: Sulphuric-acid pickling tanks are commonly protected with rubber linings, which isolate the structural tank metal from the acid.

• A. Hardness & brittleness increases
• B. Ductility decreases
• C. Neither A. nor B.
• D. Both A. and B.

Explanation: A higher carbide-to-graphite ratio produces a harder, more brittle cast iron because carbides are hard and brittle while graphite…

• A. Mica
• B. Glass
• C. Brass
• D. Cast iron

Explanation: Glass is amorphous because its atoms lack the long-range, repeating crystal structure found in crystalline solids.

• A. Plain carbon steel
• B. Stainless steel
• C. Rubber or durmet-20 lined
• D. Lead

Explanation: Ammonium chloride solutions are strongly corrosive to many ordinary metals, so equipment is protected with rubber or Durmet-20 linings.

• A. Precipitation
• B. Fusion
• C. Agglomeration
• D. Sintering

Explanation: Sintering is the controlled heating of compacted metal powder below its melting point, allowing particles to bond and gain strength.

• A. Cast iron
• B. Stainless steel
• C. Karbate
• D. Lead lined steel

Explanation: Cast iron is used for the Solvay carbonating tower because it withstands the alkaline ammoniacal brine and carbon dioxide environment at…

• A. Graphite
• B. Diamond
• C. Carborundum
• D. Pumice stone

Explanation: Diamond is the hardest naturally occurring material because its carbon atoms form a very strong three-dimensional covalent network.

• A. Tempering
• B. Annealing
• C. Normalising
• D. None of these

Explanation: Normalising heats steel above its critical range and then cools it in air, refining the grain structure and reducing the effects of…

• A. Stainless steel
• B. Titanium
• C. Aluminium
• D. Lead

Explanation: Lead has a density of about 11.3 g/cm³, higher than the listed metals, and melts at only about 327°C.

• A. Copper & iron
• B. Copper & copper-nickel alloys
• C. Iron & nickel
• D. Tin & nickel

Explanation: Platinum thermocouples use copper and copper-nickel alloy compensation or lead wires because these combinations reproduce the…

• A. Titanium
• B. Aluminium
• C. Magnesium
• D. Tin

Explanation: Magnesium is the lightest of the commonly used engineering metals, with a density of about 1.7 g/cm³.