Correct option is D
Bearings are designed to reduce friction and support rotating or sliding parts in machines. They are typically made from materials that offer high strength, wear resistance, and low friction properties.
· Chrome steel: Commonly used for rolling element bearings due to its high hardness, strength, and wear resistance.
· Stainless steel: Used for bearings in corrosive environments (e.g., food and marine industries) due to its resistance to rust and chemicals.
· Bronze: A self-lubricating material often used for plain (bushing) bearings due to its low friction and good load-bearing capacity.
· Wood: Not a common bearing material in modern applications. Historically, wooden bearings were used in water mills and rudimentary machines, but they lack the strength, durability, and precision required for most industrial applications today.
