All Free Chemical Engineering MCQs with Answers

• A. High carbon steel
• B. Dead mild steel
• C. Medium carbon steel
• D. Mild steel

Explanation: Hammers and railway rails require high hardness and wear resistance, obtained from high-carbon steel.

• A. Erosion
• B. Creep
• C. Resilience
• D. None of these

Explanation: Creep is the gradual, time-dependent deformation that occurs when a material remains under constant stress, especially at elevated…

• A. Is very costly
• B. Corrodes easily
• C. Is having low creep strength
• D. None of these

Explanation: Lead has poor mechanical strength and low creep resistance, so it can deform slowly under sustained load.

• A. Cast iron
• B. Lead lined mild steel
• C. Aluminium
• D. Rubber lined mild steel

Explanation: The hydration mixture contains sulphuric acid and mercuric sulphate, so the tower needs strong corrosion protection.

• A. Annealing
• B. Hardening
• C. Normalising
• D. Shot peening

Explanation: Cold working increases hardness and residual stresses while reducing ductility, so annealing is used to soften the steel and restore…

• A. Stainless steel-lead lined
• B. Carbon steel-brick lined
• C. Cast iron
• D. High carbon steel-porcelain lined

Explanation: A water-gas generator operates at high temperature, so its shell is made from carbon steel for strength and lined with refractory brick…

• A. Annealing
• B. Tempering
• C. Normalising
• D. Spheroidising

Explanation: Spheroidising changes lamellar cementite into rounded particles, reducing resistance to cutting and improving machinability, particularly…

• A. Lead
• B. Mild steel
• C. Copper
• D. Special alloys

Explanation: Lead resists attack by dilute sulphuric acid because it develops a protective insoluble sulphate layer.

• A. Die
• B. True centrifugal
• C. Slush
• D. Investment

Explanation: Pipes are commonly made by true centrifugal casting, in which molten metal is forced against a rotating mould wall to produce a dense…

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

Explanation: Urea autoclaves handle hot, concentrated urea solutions that are highly corrosive, so stainless steel is selected for its corrosion…

• A. Steel drum
• B. Cast iron vessel
• C. Cast iron vessel lined with acid-proof masonry brick
• D. Stainless steel vessel

Explanation: Stainless steel is passivated by nitric acid and therefore resists corrosion during storage.

• A. Iron
• B. Vanadium
• C. Tungsten
• D. Cobalt

Explanation: Invar is mainly an iron-nickel alloy containing roughly 64% iron and 36% nickel.

• A. 5
• B. 10
• C. 20
• D. 0

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

• A. None of these
• B. Karbate
• C. Cast iron
• D. Monel

Explanation: Monel has excellent resistance to chloride-containing solutions, including concentrated brine, because of its nickel-copper composition.

• A. Magnetic properties
• B. Ductility
• C. Corrosion resistance
• D. Cutting hardness

Explanation: Tungsten forms hard alloy carbides and raises the hot hardness and wear resistance of steel, which is essential for cutting tools.

• A. Cast iron containers
• B. Galvanised or tin lined drums
• C. Boxed glass carboys
• D. Nickel lined steel tank cars

Explanation: Phenol is commonly shipped in nickel-lined steel tank cars, lined drums, or glass carboys, but cast iron is unsuitable because phenol can…

• A. 4
• B. 8
• C. 14
• D. 20

Explanation: Acid-resistant cast iron is made by adding a high silicon content, typically about 14 to 16%, which promotes formation of a protective…

• A. Yield point
• B. Ultimate tensile strength (UTS)
• C. Ductility
• D. None of these

Explanation: Normalising refines the grain structure and generally raises strength and hardness compared with the soft annealed condition, but it…

• A. None of these
• B. Cast iron and aluminium
• C. Stainless steel and high silicon cast iron
• D. PTFE and porcelain

Explanation: Concentrated hydrochloric acid is highly corrosive to ordinary metals, especially aluminium and many steels.

• A. Copper, aluminium and silver
• B. Copper, nickel and zinc
• C. Silver, zinc and aluminium
• D. Silver, nickel and zinc

Explanation: German silver contains copper, nickel and zinc, despite its name and silvery appearance.