Free Chemical Process Principles MCQs with Answers

• A. Chromium
• B. Vanadium
• C. Cobalt
• D. Molybdenum

Explanation: Molybdenum can substitute for tungsten in high-speed steel because it provides comparable hardness and hot-strengthening effects at high…

• A. German silver
• B. Pewter type metal
• C. Soft solder
• D. White-bearing metal

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

• A. Highly electronegative in nature
• B. An element which exhibits the properties of both metal & non-metal
• C. An alloy
• D. All A., B. and C.

Explanation: A metalloid has intermediate characteristics, showing some metallic and some non-metallic properties, as seen in elements such as silicon…

• A. Least active
• B. Most stable
• C. Most active
• D. Most noble

Explanation: The top of the electromotive or electrochemical series contains the most readily oxidised metals, so they are the most active.

• A. Monel drums
• B. Steel cylinders
• C. Aluminium containers
• D. Cast iron vessels

Explanation: Hydrocyanic acid attacks iron, so ordinary cast-iron vessels are unsuitable for its shipment.

• A. Nitric acid (95%) at room temperature
• B. Sulphuric acid (10%) at room temperature
• C. Sulphur trioxide at 60°C
• D. Any of these

Explanation: Polyethylene has good resistance to dilute sulphuric acid at room temperature, whereas concentrated nitric acid and sulphur trioxide can…

• A. Calorising
• B. Zincification
• C. Galvanising
• D. Tempering

Explanation: Galvanising is the application of a protective zinc coating to steel or iron.

• A. Lead lined concrete vessel
• B. Wood
• C. Metal
• D. Either B. or C.

Explanation: An apron conveyor carries material on overlapping plates or aprons, and its trough may be constructed from either wood or metal depending…

• A. Electrical industry
• B. Utensil manufacture
• C. Industrial equipment manufacture
• D. Small scale industries

Explanation: Copper is used most extensively in the electrical industry because of its high electrical conductivity, ductility and ease of drawing into…

• A. Calcium carbide
• B. Charcoal
• C. Hydrocarbon oil
• D. Graphite

Explanation: Pack carburising surrounds the steel with a carbon-rich solid pack, traditionally charcoal, which supplies carbon at high temperature.

• A. Freon
• B. H2SO4 (95%) at room temperature
• C. Wet SO2
• D. H2SO4 (fuming)

Explanation: Wet sulphur dioxide is highly corrosive because dissolved moisture forms acidic sulphurous acid, which attacks cast iron.

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

Explanation: Wrought iron has the highest melting point among these choices, generally around 1535°C.

• A. None of these
• B. Melts
• C. Is heated
• D. Rusts

Explanation: Rusting forms new substances, mainly hydrated iron oxides, so the composition and properties of iron change.

• A. Body centred cubic
• B. Face centred cubic
• C. Simple hexagonal
• D. None of these

Explanation: Ferritic stainless steel has a body-centred cubic iron matrix, stabilised by chromium and low carbon content.

• A. Muntz metal
• B. Admiralty gun metal
• C. Pewter metal
• D. German silver

Explanation: Muntz metal, admiralty gun metal and German silver are copper-based alloys.

• A. Tungsten
• B. Vanadium
• C. All A., B. & C.
• D. Silicon

Explanation: Adding about 12 to 15% silicon produces a high-silicon cast iron with much better resistance to acids and other corrosive environments.

• A. Corundum
• B. Carborundum
• C. Topaz
• D. Calcite

Explanation: On the standard Mohs scale, corundum has a hardness of 9 and diamond has 10, making corundum the mineral immediately below diamond.

• A. Pig iron
• B. All A., B. & C.
• C. Ferroalloys
• D. Steel

Explanation: In pig iron, steel and ferroalloys, carbon commonly occurs chemically combined with iron or another metal as carbide, although some cast…

• A. Carbon
• B. Iron
• C. None of these
• D. Phosphorous

Explanation: Carbon, iron and phosphorus all show polymorphism: carbon forms diamond and graphite, iron changes crystal form with temperature, and…

• A. Nickel, tin and copper
• B. Manganese, phosphorus and nickel
• C. Copper, phosphorus and nickel
• D. Copper, tin and zinc

Explanation: Gun metal is a copper alloy containing mainly copper and tin, with zinc added to improve strength and castability.