All Free Chemical Engineering MCQs with Answers

• A. Cast iron
• B. Wrought iron
• C. Karbate
• D. Stainless steel or glass lined vessel

Explanation: SBR polymerisation reactors commonly use stainless steel or glass-lined construction because these materials resist corrosion and…

• A. Pewter
• B. Brass
• C. Solder
• D. Babbitt metal

Explanation: Brass is primarily an alloy of copper and zinc and normally contains no tin.

• A. Tough
• B. Ductile
• C. Brittle
• D. Malleable

Explanation: Cast iron contains relatively high carbon and has graphite or carbide phases that promote fracture rather than plastic deformation.

• A. Oxygen
• B. Arsenic
• C. Antimony
• D. Bismuth

Explanation: Even a very small amount of bismuth segregates at grain boundaries in copper and causes severe hot and cold brittleness, making…

• A. Manganese
• B. Phosphorous
• C. Silicon
• D. Sulphur

Explanation: Manganese strengthens low-carbon steel and raises its yield point, while also combining with sulphur to reduce harmful iron sulphide…

• A. Copper
• B. Duralumin
• C. Brass
• D. Silver

Explanation: Duralumin is an aluminium-copper alloy that gains strength through precipitation or age hardening after solution treatment and controlled…

• A. Injection moulded
• B. Extruded
• C. Cast molded
• D. None of these

Explanation: Thermosetting resins form a permanent cross-linked network during curing, so they are commonly shaped by casting, compression, or transfer…

• A. Made lustrous by heating it
• B. Hammered to a thin sheet
• C. Fractured without deformation
• D. Drawn into wires

Explanation: Ductility is the ability to undergo substantial plastic deformation in tension, which allows a material to be drawn into wire.

• A. Friable
• B. Ductile
• C. Brittle
• D. None of these

Explanation: A ductile material undergoes considerable permanent deformation under tensile loading before fracture.

• A. High co-efficient of thermal expansion
• B. Low thermal conductivity
• C. High corrosion resistance
• D. All A., B. and C.

Explanation: Brass is selected for these evaporator tubes mainly because it resists corrosion in the sugar and salt environments.

• A. Calcium
• B. Boron
• C. Silicon
• D. Aluminium

Explanation: Carborundum is the common name for silicon carbide, with the formula SiC.

• A. High silicon iron (14% Si)
• B. Tin
• C. Stainless steel
• D. All A., B. and C.

Explanation: Carbon tetrachloride is compatible with high-silicon iron, tin, and suitable stainless steel, all of which are used for…

• A. 0.5
• B. 2
• C. 40
• D. 75

Explanation: Steel has a Young’s modulus of about 200 GPa, which is approximately 2 × 10⁶ kg/cm².

• A. Armature of small motors/generators
• B. High frequency transformers
• C. Induction motors
• D. Generators and small motors

Explanation: High-silicon electrical steel, containing roughly 4% silicon, is used for high-frequency transformer cores because it has low hysteresis…

• A. Hydrochloric acid (10%)
• B. Hydrochloric acid (95%)
• C. None of these
• D. Sulphuric acid

Explanation: PTFE is exceptionally resistant to both dilute and concentrated hydrochloric acid and to sulphuric acid under ordinary conditions.

• A. Lead
• B. Alloy steel
• C. Rubber or ceramic material
• D. Cast iron

Explanation: Ball-mill liners are commonly made from cast iron, alloy steel, rubber, or ceramic materials selected for abrasion resistance.

• A. Wrought iron
• B. Steel
• C. Cast iron
• D. None of these

Explanation: Steel commonly shows a granular or crystalline fracture, whereas wrought iron is characteristically fibrous.

• A. Tantalum
• B. Aluminium
• C. Nickel or glass lined steel
• D. Lead

Explanation: PVC polymerisation can involve corrosive chloride-containing materials, so reactors are commonly glass-lined steel or nickel alloy to…

• A. Corrosion resistance
• B. Cutting ability
• C. Elasticity & creep resistance
• D. Abrasion resistance & toughness

Explanation: Manganese increases hardenability and contributes to toughness and resistance to abrasion, making alloy steel more durable under impact…

• A. Formic acid
• B. Ammonia
• C. Ethyl alcohol
• D. Acetone

Explanation: Formic acid is sufficiently corrosive to attack ordinary mild steel, so it requires more resistant container materials.