91. Which metal is commonly used for making electrical contacts and connectors in high-power applications due to its low electrical resistance and high melting point?
a) Copper
b) Aluminum
c) Silver
d) Molybdenum
92. What is the process of converting iron into steel by heating the iron with a controlled amount of carbon and other alloying elements in a controlled atmosphere and then slowly cooling it called?
a) Refining
b) Smelting
c) Milling
d) Heat-treating
93. Which metal is primarily used for making electrical contacts and connectors in electronic devices due to its low contact resistance and resistance to corrosion?
a) Copper
b) Aluminum
c) Silver
d) Iridium
94. What is the process of converting iron into steel by heating the iron with a controlled amount of carbon and other alloying elements in a controlled atmosphere and then rapidly cooling it called?
a) Refining
b) Smelting
c) Milling
d) Quenching
95. Which metal is commonly used for making electrical contacts and connectors in high-temperature applications due to its high melting point and resistance to corrosion?
a) Copper
b) Aluminum
c) Silver
d) Hafnium
