Question 81:
Which of the following is a typical property of non-ferrous metals?
A) High corrosion resistance
B) Magnetic
C) High density
D) Low melting point
Answer: A) High corrosion resistance
Explanation: Non-ferrous metals typically exhibit high corrosion resistance, making them suitable for various applications, including marine and chemical environments.
Question 82:
What is the purpose of using limestone in the iron smelting process?
A) To provide carbon
B) To act as a flux
C) To oxidize impurities
D) To increase temperature
Answer: B) To act as a flux
Explanation: Limestone is used as a flux in iron smelting to combine with impurities, forming slag that can be removed from the molten iron.
Question 83:
What is the primary function of a crucible in metallurgy?
A) To mix metals
B) To hold and melt metal
C) To cool molten metal
D) To store raw materials
Answer: B) To hold and melt metal
Explanation: A crucible is a container designed to hold and melt metal at high temperatures, often used in casting processes.
Question 84:
Which of the following processes is used for refining copper?
A) Amalgamation
B) Roasting
C) Electrolysis
D) Sintering
Answer: C) Electrolysis
Explanation: Electrolysis is the method commonly used to refine copper, removing impurities from the impure copper anode.
Question 85:
What is the primary method for recycling aluminum?
A) Melting
B) Electrolysis
C) Crushing
D) Sintering
Answer: A) Melting
Explanation: Aluminum recycling primarily involves melting down scrap aluminum to be reused in various applications, which requires significantly less energy than primary production.
Question 86:
Which of the following metals is used to produce lightweight alloys?
A) Lead
B) Magnesium
C) Copper
D) Iron
Answer: B) Magnesium
Explanation: Magnesium is commonly used to produce lightweight alloys due to its low density and high strength-to-weight ratio.
Question 87:
What is the role of silicon in steelmaking?
A) Increases brittleness
B) Acts as a deoxidizer
C) Lowers melting point
D) Enhances corrosion
Answer: B) Acts as a deoxidizer
Explanation: Silicon is added to steel during the smelting process to act as a deoxidizer, helping to remove oxygen from the molten metal.
Question 88:
Which of the following processes is used to produce high-purity silicon for electronics?
A) Czochralski process
B) Kroll process
C) Sintering
D) Electrolysis
Answer: A) Czochralski process
Explanation: The Czochralski process is a method used to grow high-purity silicon crystals for semiconductor applications.
Question 89:
What is the primary disadvantage of using steel in construction?
A) Low strength
B) Corrosion susceptibility
C) High cost
D) Heavy weight
Answer: B) Corrosion susceptibility
Explanation: One of the primary disadvantages of using steel in construction is its susceptibility to corrosion, which can weaken structures over time.
Question 90:
Which of the following elements is commonly used to improve the hardenability of steel?
A) Carbon
B) Manganese
C) Nickel
D) All of the above
Answer: D) All of the above
Explanation: Carbon, manganese, and nickel are all alloying elements that can improve the hardenability of steel, allowing it to achieve greater hardness upon quenching.
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