All Free Chemical Engineering MCQs with Answers

• A. Induction
• B. Age
• C. Work
• D. Flame

Explanation: Plastic deformation during cold working increases dislocation density, making the metal harder and stronger but less ductile.

• A. Grey cast iron
• B. Pig iron
• C. White cast iron
• D. Nodular cast iron

Explanation: Nodular cast iron contains graphite in rounded nodules, which disturb the metal matrix less than the flakes in grey iron and give much…

• A. Iron, nickel and chromium
• B. Tin, zinc and nickel
• C. Copper and nickel
• D. Copper and tin

Explanation: Inconel is primarily a nickel-based alloy containing substantial chromium and iron, with other additions depending on grade.

• A. Copper
• B. Cast iron
• C. Aluminium
• D. High carbon steel

Explanation: Cast iron is used for the methane-chlorination mixing vessel because it provides suitable resistance to the chlorinating environment and…

• A. Brass for low
• B. Nickel alloys for high
• C. Aluminium for all
• D. Both A. & B.

Explanation: Bimetallic thermometers use metals with different thermal expansion coefficients: brass-based combinations are used for lower…

• A. 18-20
• B. 6-8
• C. 30-35
• D. 50-55

Explanation: Typical high-speed tool steel contains about 18% tungsten, often with chromium, vanadium and carbon.

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

Explanation: Hydrochloric acid readily attacks ordinary steel and many unprotected metals, so a steel vessel is protected with a chemically resistant…

• A. Glass
• B. Teflon
• C. Glass lined steel
• D. Bakelite

Explanation: The chlorinator handles highly corrosive chlorine and chlorinating mixtures, so glass-lined steel provides corrosion resistance together…

• A. Corrosion resistance
• B. Tensile strength
• C. Compressive strength
• D. Machinability

Explanation: Lead, sulphur and phosphorus form inclusions or compounds that make low-carbon steel easier to cut, drill and shape.

• A. Hardness increases
• B. All A., B. and C.
• C. Tensile strength increases
• D. Ductility reduces

Explanation: Increasing carbon generally raises steel hardness and tensile strength but reduces ductility.

• A. Medium carbon steel
• B. Cast iron
• C. High carbon steel
• D. Wrought iron

Explanation: Gray cast iron has relatively low tensile strength because its graphite flakes act as internal stress concentrators.

• A. Cold working
• B. Shot blasting
• C. Annealing
• D. Heating

Explanation: Annealing softens steel by heating it and then cooling it slowly, which relieves internal stresses and produces a more workable structure.

• A. Copper & zinc
• B. Zinc & tin
• C. Copper & nickel
• D. Copper & tin

Explanation: Bell metal is a copper-tin bronze, traditionally containing a relatively high proportion of tin to produce its hard, resonant character.

• A. Cubic
• B. Hexagonal
• C. Orthorhombic
• D. None of these

Explanation: Most common engineering metals crystallise in cubic structures, mainly body-centred cubic or face-centred cubic forms.

• A. High speed
• B. High carbon
• C. Chrome
• D. Silicon

Explanation: Ball bearings require high hardness, wear resistance and fatigue strength, supplied by high-carbon chromium steel.

• A. Cartridge brass
• B. Muntz brass
• C. Aluminium brass alloy
• D. Wood metal

Explanation: Condenser tubes commonly use corrosion-resistant copper alloys such as cartridge brass, Muntz brass and aluminium brass.

• A. Stainless steel-glass lined
• B. Brass
• C. Nickel
• D. Cast iron-rubber lined

Explanation: Tomato juice is acidic and can attack ordinary metals, while stainless steel provides hygienic corrosion resistance and glass lining gives…

• A. 0.015
• B. 0.055
• C. 0.505
• D. 0.805

Explanation: Sulphur is an undesirable impurity in steel because it promotes hot shortness, so its specification is kept near 0.05 percent.

• A. Lead lined vessels
• B. Solder alloys
• C. Electric cable sheathing
• D. Storage batteries

Explanation: The largest use of lead is in lead-acid storage batteries, where it forms the grids and active electrode materials.

• A. Both B. and C.
• B. Carbon impregnated with resin (usually Bakelite)
• C. An acid resistant material
• D. A mixture of iron dust and saw dust

Explanation: Karbate is a carbon or graphite material impregnated with a resin, commonly Bakelite, and is valued for acid resistance.