Question 71:
What is “powder metallurgy”?
A) A process for extracting metals from ores
B) A method for creating materials from powdered metals
C) A technique for alloying metals
D) A way to increase the density of metals
Answer: B) A method for creating materials from powdered metals
Explanation: Powder metallurgy involves creating parts by pressing and sintering powdered metals, allowing for precise control over the material properties.
Question 72:
Which of the following is a typical characteristic of ferrous metals?
A) Generally non-magnetic
B) Low melting points
C) High tensile strength
D) High ductility
Answer: C) High tensile strength
Explanation: Ferrous metals, which contain iron, typically have high tensile strength, making them suitable for construction and industrial applications.
Question 73:
Which process is used to convert scrap iron into pig iron?
A) Refining
B) Sintering
C) Smelting in a blast furnace
D) Electrolysis
Answer: C) Smelting in a blast furnace
Explanation: Scrap iron can be converted into pig iron through smelting in a blast furnace, where impurities are removed.
Question 74:
What is the main advantage of using cold working in metallurgy?
A) Increases brittleness
B) Improves surface finish
C) Requires high temperatures
D) Lowers strength
Answer: B) Improves surface finish
Explanation: Cold working improves the surface finish of metals and increases their strength through strain hardening without requiring high temperatures.
Question 75:
Which of the following is a common use of cobalt?
A) Magnets
B) Batteries
C) Alloys
D) All of the above
Answer: D) All of the above
Explanation: Cobalt is used in a variety of applications, including magnets, batteries, and as an alloying element in superalloys.
Question 76:
What is the primary component of steel?
A) Carbon
B) Chromium
C) Nickel
D) Manganese
Answer: A) Carbon
Explanation: Carbon is the primary alloying element in steel, significantly influencing its strength, hardness, and ductility.
Question 77:
Which of the following metals is commonly recycled?
A) Aluminum
B) Lead
C) Copper
D) All of the above
Answer: D) All of the above
Explanation: Aluminum, lead, and copper are all commonly recycled metals, reducing the need for primary extraction and saving energy.
Question 78:
What is the primary method used to produce magnesium from its ores?
A) Electrolysis
B) Carbon reduction
C) Hydrometallurgy
D) Sintering
Answer: A) Electrolysis
Explanation: Magnesium is primarily produced through electrolysis of molten magnesium salts, allowing for the extraction of pure magnesium metal.
Question 79:
Which of the following is a common method for producing titanium?
A) Kroll process
B) Bayer process
C) Hall-Héroult process
D) Electrorefining
Answer: A) Kroll process
Explanation: The Kroll process is the primary method for producing titanium, involving the reduction of titanium tetrachloride with magnesium.
Question 80:
What is the main purpose of adding alloying elements to steel?
A) To decrease cost
B) To improve specific properties
C) To increase weight
D) To simplify processing
Answer: B) To improve specific properties
Explanation: Alloying elements are added to steel to enhance specific properties, such as strength, hardness, corrosion resistance, and ductility.
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