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51.

Red brass contains ______________ of zinc.(a) 40-50%(b) 4-6%(c) 1-2%(d) 30-35%The question was posed to me in a national level competition.Question is taken from Properties of Copper and its Alloys-2 topic in chapter Copper and its Alloys of Aerospace Materials & Processes

Answer»

The correct choice is (b) 4-6%

To EXPLAIN I would say: Red brass is made of several COMPONENTS that include zinc, copper, tin phosphorus, IRON, etc. Red brass contains around 4-6% of zinc. It is also made of APPROXIMATELY 0.75% phosphorus and 4-6% of tin.
Discussion
52.

Aluminium bronze is a type of bronze where aluminium is one of the dominant elements.(a) True(b) FalseThis question was posed to me in final exam.Query is from Properties of Copper and its Alloys-2 in chapter Copper and its Alloys of Aerospace Materials & Processes

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Correct answer is (a) True

For EXPLANATION I would say: There are DIFFERENT types of bronzes BASED on their composition. ALUMINIUM bronze is a kind of bronze where aluminium is one of the dominant ELEMENTS.
Discussion
53.

___________ is used in manufacturing components like fuel line fittings.(a) Copper(b) Red brass(c) Red plate(d) BronzeThis question was addressed to me by my school principal while I was bunking the class.The origin of the question is Properties of Copper and its Alloys-2 in section Copper and its Alloys of Aerospace Materials & Processes

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Right choice is (b) Red BRASS

Explanation: Red brass is an alloy that is USED in manufacturing components like FUEL line fittings. It is a material that machines well. Apart from being used in fuel line fittings, it is also used in manufacturing oil line fittings.
Discussion
54.

Smelting is done to eradicate unwanted materials like ___________ to the fullest extent possible.(a) copper(b) copper and gangue minerals(c) sulfur(d) sulfur and gangue mineralsI have been asked this question by my college director while I was bunking the class.Asked question is from Manufacturing Processes of Copper and its Alloys in chapter Copper and its Alloys of Aerospace Materials & Processes

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Correct option is (d) sulfur and gangue minerals

To EXPLAIN I would SAY: Smelting is done to ERADICATE unwanted materials like sulfur and gangue minerals to the fullest extent possible. The output of the smelting phase is CALLED COPPER matte. It is a combination of sulfur, copper and iron.
Discussion
55.

Phosphor bronze casting alloy contains approximately __________ % of zinc.(a) 0-0.3(b) 0.75(c) 1.5-4.5(d) 45The question was posed to me in examination.Query is from Properties of Copper and its Alloys-3 topic in portion Copper and its Alloys of Aerospace Materials & Processes

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Right ANSWER is (C) 1.5-4.5

The best explanation: Phosphor bronze casting alloy is made of several elements like COPPER, TIN, zinc, lead, phosphor, iron, nickel, ETC. Phosphor bronze casting alloy usually contains approximately 1.5-4.5% of zinc.
Discussion
56.

Aluminium bronze contains approximately 6.5-11% of ___________(a) titanium(b) manganese(c) aluminium(d) vanadiumThe question was asked during an online interview.Enquiry is from Properties of Copper and its Alloys-3 in section Copper and its Alloys of Aerospace Materials & Processes

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Right ANSWER is (C) aluminium

Explanation: Aluminium bronze is a bronze material that contains various ELEMENTS like aluminium, MANGANESE, ETC. Aluminium bronze contains approximately 6.5-11% of aluminium. It also contains a maximum of 2% manganese.
Discussion
57.

___________ and ___________ are ores of copper.(a) Dolomite, bornite(b) Bornite, chalcopyrite(c) Chalcopyrite, dolomite(d) Bornite, magnesiteI got this question in an international level competition.I'd like to ask this question from Copper and its Alloys in division Copper and its Alloys of Aerospace Materials & Processes

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The correct choice is (b) BORNITE, chalcopyrite

Best explanation: Copper is very rarely found in its natural state. It has to be extracted from its ores through VARIOUS processes. Copper has several ores in the WORLD. Bornite and chalcopyrite are TWO ores of the ELEMENT copper.
Discussion
58.

Phosphor bronze contains approximately __________ % of copper.(a) 0.2(b) 0.1(c) 36(d) 94The question was posed to me in an interview for job.Asked question is from Properties of Copper and its Alloys-3 in portion Copper and its Alloys of Aerospace Materials & Processes

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The CORRECT answer is (d) 94

Easiest explanation: COPPER is a major component in phosphor bronze. It contains approximately 94% of copper. Phosphor bronze also contains a maximum of 0.20% lead and also 0.10% IRON composite-wise.
Discussion
59.

Brass is primarily made of copper and aluminium.(a) True(b) FalseThe question was posed to me in homework.My doubt stems from Properties of Copper and its Alloys-1 topic in division Copper and its Alloys of Aerospace Materials & Processes

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The correct choice is (b) False

Easy EXPLANATION: The above statement is INCORRECT. Brass is an alloy. It is a copper alloy. Brass is typically MADE almost entirety two elements. The two PRIMARY elements are copper and zinc. Not ALUMINIUM.
Discussion
60.

Which of the following techniques are used in the extraction of copper?(a) Refining, down process(b) Smelting, vacuum pump(c) Roasting, refining(d) RoastingThis question was addressed to me in examination.I want to ask this question from Manufacturing Processes of Copper and its Alloys topic in portion Copper and its Alloys of Aerospace Materials & Processes

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Right ANSWER is (c) Roasting, refining

To EXPLAIN: The extraction of copper from its ores is done through several techniques that include roasting, refining, smelting, CRUSHING etc. Dow’s PROCESS is done to OBTAIN the substance magnesium, not copper.
Discussion
61.

Naval brass is used in manufacturing ____________(a) bolts and studs(b) tires(c) bolts(d) bolts and tiresThe question was asked in a national level competition.This key question is from Properties of Copper and its Alloys-2 topic in section Copper and its Alloys of Aerospace Materials & Processes

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The correct choice is (a) bolts and studs

Explanation: Naval brass is an alloy material. It is USED in the manufacturing/MAKING of several components LIKE bolts, studs, nuts, ETC. It ALSO can be used in making components that come in contact with NaCl.
Discussion
62.

The density of beryllium copper is __________(a) 8.24 gram per cubic centimeters(b) 26 gram per cubic centimeters(c) 13.24 gram per cubic centimeters(d) 4.98 gram per cubic centimetersThe question was asked in an internship interview.My question is based upon Properties of Copper and its Alloys-1 in portion Copper and its Alloys of Aerospace Materials & Processes

Answer» RIGHT option is (a) 8.24 gram per cubic centimeters

Best explanation: Beryllium copper is an alloy of copper. It has a DENSITY of 8.24 gram per cubic centimeters. It is made by adding various METALS and ELEMENTS to obtain certain kinds of specific properties that make it better.
Discussion
63.

The atomic number of copper is ___________(a) 11(b) 13(c) 29(d) 4I had been asked this question during an online exam.My doubt is from Copper and its Alloys topic in portion Copper and its Alloys of Aerospace Materials & Processes

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The correct choice is (c) 29

To elaborate: Copper is an element in the periodic table that has an atomic NUMBER of 29. 11 is the atomic number of sodium, 4 is the atomic number of beryllium and 14 is the atomic number of the element SILICON.
Discussion
64.

Sulfide ores contain around _____ copper.(a) 9 – 10%(b) 8 – 12%(c) 4 – 5%(d) 0.5 – 2%I got this question in my homework.I'm obligated to ask this question of Manufacturing Processes of Copper and its Alloys topic in chapter Copper and its Alloys of Aerospace Materials & Processes

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The correct option is (d) 0.5 – 2%

The explanation is: Copper is usually never found in a natural STATE. Copper is found in several ores ACROSS the world including sulfide ore which CONTAINS 0.5 – 2% of copper. It has to undergo several processes to attain PURITY.
Discussion
65.

Phosphor bronze casting alloy cannot be used in making components that need to be resistant to salt-water corrosion.(a) True(b) FalseThis question was posed to me in class test.Asked question is from Properties of Copper and its Alloys-3 in section Copper and its Alloys of Aerospace Materials & Processes

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Correct choice is (B) False

Explanation: Phosphor bronze casting alloy, which is ALSO known as LEADED phosphor bronze is an advantageous material due to its strength, LOW coefficient of friction, etc. It can be used in making such materials because it is RESISTANT to salt-water corrosion.
Discussion
66.

____________ is also known as Tobin bronze.(a) Red clay(b) Sand(c) Uranium(d) Naval brassThe question was posed to me in an online interview.My doubt is from Properties of Copper and its Alloys-2 in division Copper and its Alloys of Aerospace Materials & Processes

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The CORRECT option is (d) Naval brass

To elaborate: Naval brass is ALSO known as Tobin BRONZE. It has several qualities that are beneficial in the manufacturing and construction of aerospace components. Naval brass has wonderful MACHINING qualities.
Discussion
67.

Naval brass contains around ____________ of lead.(a) 0.5%(b) 0.10%(c) 0.20%(d) 10%I got this question during an interview.My doubt is from Properties of Copper and its Alloys-2 in section Copper and its Alloys of Aerospace Materials & Processes

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Correct choice is (c) 0.20%

To EXPLAIN I would say: Naval brass consists of AROUND 0.2 per-cent lead. It also contains approximately 0.10 per-cent iron. Naval brass also has some impurities PRESENT that ACCOUNT for about not more than 0.1 per-cent.
Discussion
68.

The ultimate tensile strength for heat-treated muntz metal is __________(a) 80,000 p.s.i(b) 20,000 p.s.i(c) 60,000 p.s.i(d) 57,000 p.s.iThis question was addressed to me in examination.I'd like to ask this question from Properties of Copper and its Alloys-1 topic in chapter Copper and its Alloys of Aerospace Materials & Processes

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Right option is (a) 80,000 p.s.i

To explain: Muntz is a metal consisting of both copper and zinc. It has several advantageous properties, LIKE being corrosion-resistant under CERTAIN conditions and possessing HIGH STRENGTH when SUBJECTED to heat treatments.
Discussion