What are the materials used for brushes in dc machines?a.Steelb.Aluminiumc.Irond.Carbon

Break Down the Problem

1. Identify the materials commonly used for brushes in DC machines.
2. Evaluate the properties and applications of each material listed.

Relevant Concepts

Brushes in DC machines are critical components that conduct current between stationary and rotating parts. The choice of material impacts conductivity, wear resistance, and performance.

Analysis and Detail

1. Steel: While steel has good tensile strength, it is not commonly used for brushes due to its poor conductivity and tendency to wear out quickly.
2. Aluminium: Aluminium has moderate conductivity but is not a standard material for brushes because it is softer and can wear out faster than desired.
3. Iron: Similar to steel, iron is not typically used due to its relatively poor conductivity when compared to other materials.
4. Carbon: Carbon is the most common material used for brushes in DC machines. It has excellent conductivity, good wear resistance, and can handle the heat generated during operation effectively.

Verify and Summarize

The most suitable material for brushes in DC machines is carbon. The other materials listed (steel, aluminium, iron) do not offer the same level of performance or durability needed for effective brush operation.

Final Answer

The correct material used for brushes in DC machines is d. Carbon.