Explore topic-wise InterviewSolutions in .

Right CHOICE is (a) ZINC

The explanation: Copper is an element that can be alloyed with several other elements. It has MANY advantages. Copper is very frequently alloyed with the element zinc. BRASS and bronze are some examples of alloyed materials.

Right choice is (c) crushing

To elaborate: Crushing is one of the first things done in the EXTRACTION process of COPPER from its ore. Copper ore is crushed to a particular required size. Crushing is done to separate the PARTICLES to make it easier to OBTAIN the pure material.

Right option is (d) 8.9 GRAM PER cubic CENTIMETRE

To elaborate: Density is the ratio of mass to volume of a substance. The density of COPPER is 8.9 gram per cubic centimetre. The density of ALUMINIUM is 2.7 gram per cubic centimetre and titanium is 4.506 gram per cubic centimetre.

Right option is (a) True

The explanation is: The above STATEMENT is correct. OXIDE ores are typically PROCESSED USING hydrometallurgy. Hydrometallurgy involves using water-based solutions to purify copper. This technique contains processes like solvent extraction ETC.

Correct answer is (a) True

To EXPLAIN I would say: The above statement is correct. COPPER is an element that is typically DUCTILE in nature. It is due to the nature in which the atoms of copper are ARRANGED. Ductility of a material is the ability to be shaped or drawn into wires.

The correct choice is (b) PYROMETALLURGY

The explanation is: Sulfide ores are USUALLY PROCESSED through the technique known as pyrometallurgy. Pyrometallurgy involves several processes LIKE froth flotation, thickening, SMELTING, electrolysis etc.

The correct option is (b) good CONDUCTOR

To explain: One of the most beneficial properties of copper is its conductive NATURE. Copper is a very good conductor of electricity. It also has very good THERMAL conductivity. This makes it desirable to use in several INDUSTRIES.

Correct answer is (d) Iron, lead

The explanation is: Brass is an ALLOY of copper. While it is a combination of only two elements in different quantities, OCCASIONALLY MINOR quantities of other elements can be added. Elements LIKE iron, lead, aluminium etc.

The correct option is (b) bars and PLATES

To elaborate: Aluminium bronze is a bronze variant that is accessible in several forms. It is accessible especially in the form of bars and plates. It can TYPICALLY also be FOUND in the form of RODS, sheets ETC.

Right option is (a) soft, MALLEABLE

Easiest explanation: Copper is an element that is soft and malleable in nature. It is an element that is not typically used EXTENSIVELY in manufacturing major structural COMPONENTS in an aircraft. It is highly used in electrical SYSTEMS.

Right CHOICE is (c) 1085°C

The explanation is: The MELTING point of an ELEMENT a point of TEMPERATURE where the element melts. The melting point of COPPER is 1085°C. Aluminium has a melting point of 660°C and titanium’s melting point is 1668°C.

Right choice is (b) False

The explanation: The above STATEMENT is incorrect. It is possible to recycle used COPPER goods by MELTING them and once again purifying them. The product that is obtained through this process can be used in making new commodities.

The correct choice is (d) 1-3

The BEST EXPLANATION: Gun-metal is an alloy that is made/consists of several components in VARYING quantities. Gun-metal contains AROUND 1 to 3 per-cent of zinc. It also contains approximately 9 to 11 per-cent of tin.

Right choice is (B) 115,000 p.s.i

Explanation: Hy-Ten-Sl-Bronze is an alloy that has an extremely high AMOUNT of strength. The ultimate TENSILE strength of sand cast Hy-Ten-Sl-Bronze is 115,000 p.s.i. This alloy is also AVAILABLE in four other types/variants.

Right CHOICE is (d) resistant

Easiest explanation: A very good QUALITY of copper is its resistance to corrosion. Copper is TYPICALLY a corrosion-resistant material. This RESULTS in copper being USED for several purposes including decorative and electrical.

The correct option is (c) tin

To elaborate: BRONZE is a COPPER alloy that contains a large amount of tin. Bronze ALSO contains smaller amounts of materials like lead, zinc, phosphorus, etc. They are DIFFERENT VARIATIONS present depending on the composition.

Right ANSWER is (c) 86-89%

For EXPLANATION: Gun-metal includes around 86-89 per-cent of copper. It is also made of various ELEMENTS like zinc, tin, LEAD, copper, ETC. Gun-metal contains around 86-89% per-cent of copper and a maximum of 2 per-cent of lead.

The correct answer is (B) 15,000 pound-force per square inch

Explanation: Gun-metal casting has a yield point of 15,000 pound-force per square inch. Gun-metal (castings) also have a UTI (Ultimate TENSILE STRENGTH) of AROUND 30,000 pound-force per square inch.

The correct ANSWER is (d) High-strength, non-magnetic

Easiest EXPLANATION: Beryllium COPPER is an alloy. It has numerous advantageous or desirable properties. ONE of the advantageous properties of beryllium copper is its high strength. Another property is its non-magnetic NATURE.

The CORRECT option is (c) 0.25

Easiest explanation: Red BRASS is an alloy that is also sometimes REFERRED to as a bronze material due to its QUANTITY of tin. Red brass contains AROUND 0.25 per-cent of antimony and around 84 to 86 percent of copper.

The correct choice is (d) non-magnetic

Explanation: Copper is an ELEMENT in the periodic table that is non-magnetic in NATURE. It is also not DULL and has a shiny texture. Copper is typically pinkish-orange in colour when NEWLY exposed to the atmosphere.

The correct choice is (C) 30-35%

For EXPLANATION: Brass is an alloy of copper. The properties of the alloy like DUCTILITY vary depending on the composition of the alloy. Brass CONSISTING of around 30% to 35% zinc tends to be highly ductile in nature.

Correct answer is (a) True

To elaborate: The above STATEMENT is correct. Copper has SEVERAL ORES across the world. One of the ores of copper is cuprite. Cuprite happens to be a minor ore of the ELEMENT copper. Copper is a conductor of both heat and ELECTRICITY.

The correct answer is (c) strong

The best explanation: MANGANESE BRONZE is a type of brass that typically has a high AMOUNT of zinc. It has various GOOD properties, one of the most important properties being its remarkably high strength. It is not a weak alloy.

The correct choice is (B) 78%

The BEST EXPLANATION: Aluminium bronze casting alloy contains 78% of copper. It is a HUGE part of the overall chemical composition. Aluminium bronze casting alloy also consists of around 2-5% of iron and 10.5-12% aluminium.

Correct OPTION is (a) True

The EXPLANATION is: The above statement is correct. ONE of the beneficial properties of manganese bronze is it’s resistance to corrosion. It is also known for being an alloy that has remarkable STRENGTH and toughness.

The correct ANSWER is (c) 3 to 7.5%

Easiest explanation: Manganese-aluminium alloy is a type of manganese bronze alloy. It CONSISTS of approximately 2.5% to 5.0% of manganese. It ALSO consists of around 60% to 68% copper and 2.0% to 4.0% of IRON.

Correct answer is (d) 60%, 40%

The best I can explain: Muntz METAL is a type of BRASS. It consists of both copper and ZINC. Composition wise, there is 60% copper and 40% zinc. It has several distinct PROPERTIES which vary depending on if it is heat-treated or not.

Correct answer is (b) 2 to 2.25%

Easy explanation: Beryllium COPPER is an alloy that CONSISTS of around 2% to 2.25% of beryllium. It is a non-magnetic and high-strength alloy. It is also attainable in several other forms like sheets, STRIPS, BARS ETC.

Correct answer is (a) 85,000 pounds per square inch

Explanation: Aluminium bronze casting alloys are materials that are known to POSSESS the QUALITY of good STRENGTH. They are known to have a UTS- ultimate TENSILE strength of 85,000 pounds per square inch.

Correct answer is (a) 4%

For EXPLANATION: Aluminium bronze consists of around 4% of iron. It is also known to have a maximum of 4% iron. The maximum value of tin PRESENT in aluminium bronze is 0.60% of the TOTAL MATERIAL in the composition.

The correct option is (b) BETTER

To elaborate: Naval brass is an alloy that in some considerations, is better than COMMERCIAL brass. Naval brass has better strength when compared to commercial brass. It ALSO has greater corrosion RESISTANCE than commercial brass.

The correct CHOICE is (B) wear-resistant, non-corrosive

For explanation I would say: Hy-Ten-Sl-Bronze is an alloy that is non-corrosive in NATURE. It is also known to be wear-resistant. Hy-Ten-Sl-Bronze is also an alloy that is easily machinable in nature and has high HARDNESS.

The CORRECT option is (C) season cracking

Easiest explanation: Season cracking is a phenomenon typically experienced by MATERIALS like BRASSES and BRONZES. It is the cracking experienced after being used for a long duration and is referred to as season cracking.

The CORRECT option is (b) False

The explanation is: Naval bronze is an alloy MATERIAL. It is used in manufacturing several components due to its good properties, but it is not stronger than MANGANESE bronze.

Correct answer is (c) leaded GUNMETAL

The best I can explain: The bronze material phosphor bronze CASTING alloy is also known as leaded gunmetal. It has SEVERAL ADVANTAGES due to its composition, such as it tends to machine better in terms of ease than gunmetal.

Right option is (a) True

Easiest explanation: ALUMINIUM bronze is a bronze that possesses greater resistance to CORROSION than manganese bronze. HENCE, in industries and MANUFACTURING, it is USED accordingly.

Correct option is (c) 99.9%

To elaborate: The amount of copper FOUND in ores is different for different ores. There are also sulfide ores and oxide ores of copper. But, at the END of the EXTRACTION process, the copper obtained has a PURITY of around 99.9%.

Correct option is (a) Chalcocite

Easiest EXPLANATION: Copper is found in several ores. Some of the ores are chalcocite, CUPRITE, bornite, chalcopyrite etc. Magnesite and DOLOMITE are not ores of copper, they are ores of the ELEMENT magnesium.

Right answer is (C) 2562°C

For explanation: The boiling point of an element is the TEMPERATURE where the EXTERNAL pressure AROUND the liquid EQUALS the pressure exerted by the vapour of the liquid. The boiling point of copper is 2562°C and aluminium is 2470°C.

The correct option is (B) low

Easiest explanation: The phenomenon of season cracking is highly unwanted and detrimental to the usual requirement or process DESIRED. Hence, ONE way to deal with season cracking is low TEMPERATURE anneal.

Correct option is (c) 0.05-0.5

The explanation: PHOSPHOR bronze consists of several DIFFERENT elements. It contains approximately 0.05-0.5% of phosphorus and a minimum of 3.5% of TIN. Phosphor bronze also contains other elements like iron as WELL.