All Free Chemical Engineering MCQs with Answers

• A. Carbides
• B. Stainless steel
• C. Mild steel
• D. High carbon steel

Explanation: Wire-drawing dies must withstand severe wear and compressive stresses, so very hard carbides such as tungsten carbide are commonly used.

• A. Pack carburising
• B. Calorising
• C. Nitriding
• D. Cyaniding

Explanation: Pack carburising, nitriding, and cyaniding are case-hardening treatments that introduce carbon or nitrogen into the surface.

• A. Plastic limit
• B. Limiting load
• C. Elastic limit
• D. Breaking load

Explanation: The elastic limit is the greatest stress up to which a material returns completely to its original shape.

• A. Dilute H2SO4
• B. Dilute HNO3
• C. Dilute HCI
• D. Hydrofluoric acid

Explanation: Hydrofluoric acid attacks silica, the main constituent of ordinary glass, even though glass resists many dilute mineral acids.

• A. Plastic
• B. Steel
• C. Glass
• D. Rubber

Explanation: Elasticity in this comparison means resistance to elastic deformation, measured by Young's modulus, not the ability to stretch greatly.

• A. HCP
• B. BCC
• C. FCC
• D. Cubic

Explanation: FCC metals have many closely packed slip systems, allowing dislocations to move readily and producing high ductility.

• A. Magnetic steel
• B. Magnesium
• C. Chromium
• D. Titanium

Explanation: Titanium alloys combine low density with high strength, giving them an exceptionally high strength-to-weight ratio.

• A. Toughness
• B. Hardness
• C. Tensile strength
• D. Wear resistance

Explanation: Shock loading involves sudden absorption of energy, so shock-resisting steels require high toughness.

• A. Bromine
• B. Dry chlorine & dry fluorine
• C. Nitric acid (95% and fuming)
• D. Phosphoric acid (95%) & sulphuric acid (95% and fuming)

Explanation: Copper is suitable for dry chlorine and dry fluorine because the absence of moisture greatly reduces their corrosive attack and protective…

• A. Exists in three allotropic forms
• B. Cannot be welded
• C. Is used in oceanographic and space exploration applications
• D. None of these

Explanation: Titanium is used where high strength, corrosion resistance and low density are valuable, including oceanographic equipment and spacecraft.

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

Explanation: Graphite is highly resistant to dilute sulphuric acid, hydrochloric acid and seawater under ordinary conditions.

• A. Rubber
• B. Acrylics
• C. Plastics
• D. Lead

Explanation: Lead can undergo creep even at room temperature because its melting point is relatively low, whereas creep in many engineering materials…

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

Explanation: Carbon has the strongest overall influence on steel hardness, strength, ductility and weldability because it changes the phases and…

• A. Saw dust and iron dust mixture
• B. Mainly tin (85%) and lead
• C. Zinc and aluminium
• D. Copper and aluminium

Explanation: Tin-based Babbitt metal commonly contains about 80 to 90% tin, with lead and smaller additions such as antimony and copper.

• A. Aluminium
• B. High silicon (14%) iron
• C. Duralumin
• D. Phosphor bronze

Explanation: Duralumin is a lightweight aluminium-copper alloy with good strength, making it suitable for aircraft structures.

• A. Pig iron
• B. High speed steel
• C. Cast iron
• D. Wrought iron

Explanation: Wrought iron contains very little carbon, typically below about 0.1%, while high-speed steel, cast iron and pig iron contain substantially…

• A. Organic in nature
• B. Stronger in compression than in tension
• C. Always amorphous in nature
• D. Always bad heat conductors

Explanation: Ceramics generally withstand compressive loads well but are weak in tension because cracks propagate readily under tensile stress.

• A. Used in very high temperature applications
• B. Not suitable for drainage pipe manufacture
• C. Non-biodegradable
• D. All A., B. & C.

Explanation: Most conventional plastics resist biological decomposition, making them effectively non-biodegradable in ordinary environmental…

• A. 510
• B. 1720
• C. 2210
• D. 910

Explanation: Gas nitriding is normally conducted at about 500–550°C, so 510°C is the suitable value.

• A. Martensite
• B. Troostite
• C. Sorbite
• D. None of these

Explanation: Rapid quenching of high-carbon steel produces martensite, a very hard supersaturated structure.