Free Chemical Process Principles MCQs with Answers

• A. Its energy storage capacity
• B. Its capacity to withstand high voltage
• C. Its capacity to resist the flow of current
• D. A magnetic property

Explanation: Dielectric strength is the maximum electric field or voltage a material can withstand before electrical breakdown occurs.

• A. The costliest of all the alloys of nickel
• B. Not suitable for making kitchen utensils
• C. Used for making steam valves and turbine blades as it resists steam attack at high temperature
• D. Not used in cast and wrought forms

Explanation: Monel is a nickel-copper alloy valued for corrosion resistance, including resistance to attack by high-temperature steam.

• A. Fe3C chemically
• B. A compound of carbon and iron
• C. Characterised by an orthorhombic crystal structure
• D. All A., B. and C.

Explanation: Cementite is iron carbide, Fe₃C, an iron-carbon compound with an orthorhombic crystal structure.

• A. Acrylic sheet
• B. An elastomer
• C. An alloy of lead and tin
• D. Aluminium foil clad with Bakelite

Explanation: Perspex is the trade name for polymethyl methacrylate, commonly called an acrylic sheet.

• A. 0.2
• B. 2
• C. 4
• D. 8

Explanation: Pig iron from a blast furnace usually contains about 3.5 to 4.5% carbon, together with silicon, manganese, phosphorus and sulfur.

• A. Shrinkage
• B. Melting point
• C. Fluidity
• D. Tensile strength

Explanation: Phosphorus improves the fluidity of molten cast iron, allowing it to fill thin and complex mould sections.

• A. Used for making axle & shafts of aeroplanes, automobiles and locomotives
• B. Having poor fatigue resistance
• C. Having poor toughness
• D. Not helpful in producing cleaner steel due to oxidising action of vanadium

Explanation: Chrome-vanadium steel is valued for strong, fatigue-resistant shafts and axles in aircraft, automobiles and locomotives.

• A. Austenitic
• B. Martenistic
• C. Ferritic
• D. None of these

Explanation: Austenitic stainless steels are normally non-magnetic because their face-centred cubic austenite structure is retained at room…

• A. Aluminium, copper and manganese
• B. Aluminium, nickel and silicon
• C. Aluminium and nickel
• D. None of these

Explanation: Duralumin is primarily an aluminium-copper alloy strengthened by additions including manganese, and conventional descriptions commonly…

• A. Stainless steel containers
• B. Paper bags
• C. Either B. or C.
• D. Fibre drums

Explanation: Dry powdered DDT may be shipped in paper bags or fibre drums, which provide suitable dry packaging for the solid product.

• A. Annealing
• B. Nitriding
• C. Cyaniding
• D. Carburising

Explanation: Carburising, nitriding and cyaniding are case-hardening treatments that enrich the surface with carbon or nitrogen.

• A. High speed steel
• B. Shock resisting steel
• C. Cold work tool steel
• D. None of these

Explanation: Shock-resisting steels must absorb sudden impact without cracking, so high toughness is their defining requirement.

• A. Steel
• B. Stainless steel
• C. Wrought iron
• D. Cast iron

Explanation: Wrought iron is highly ductile and can undergo considerable plastic deformation, making it easier to bend than steel, stainless steel or…

• A. Thermoplastic materials
• B. Nickel
• C. None of these
• D. Steel or iron

Explanation: Dry chlorine can be stored in steel or iron because the absence of water prevents the severe corrosion associated with wet chlorine.

• A. Metallurgical microscope
• B. Spectroscopic techniques
• C. Electron diffraction
• D. X-ray

Explanation: Spectroscopic techniques determine electronic structure by examining how a material absorbs or emits electromagnetic radiation, revealing…

• A. High carbon steel
• B. Copper
• C. Brass
• D. Aluminium

Explanation: Brass is commonly used because it is sufficiently strong and does not readily produce sparks when the dipstick contacts the tank.

• A. Wet chlorine
• B. Nitric acid (< 25%)
• C. Hydrochloric acid (10%)
• D. Synthetic detergent solution

Explanation: Synthetic detergent solutions are generally not strongly corrosive to copper alloys such as gunmetal and bronze.

• A. Highly
• B. Not
• C. Mildly
• D. Least

Explanation: Hydrochloric acid readily attacks many common metals, producing metal chlorides and hydrogen gas, so it is classified as highly corrosive.

• A. Copper
• B. Iron
• C. Chromium
• D. Lead

Explanation: Invar is a low-expansion iron-nickel alloy, commonly containing about 36% nickel, and is valued where dimensional stability is needed.

• A. Shafts
• B. Shear blades
• C. Gears
• D. Flanges

Explanation: Dead mild steel has very low carbon content, giving it good ductility and ease of forming, which suits components such as flanges.