Q1: Machine tool bodies are usually made of

ANS:A - cast iron

Machine tool bodies are typically made of cast iron. Cast iron is favored for machine tool bodies due to several reasons:

1. Damping Properties: Cast iron has excellent vibration damping properties, which help in reducing chatter and enhancing the surface finish of machined parts.
2. Dimensional Stability: Cast iron exhibits good dimensional stability under varying temperatures and loads, ensuring accuracy and precision in machining operations.
3. Ease of Machinability: Cast iron is relatively easy to machine, allowing for the production of intricate shapes and precise features required in machine tool bodies.
4. Cost-effectiveness: Cast iron is generally more cost-effective compared to other materials suitable for machine tool bodies, making it an economical choice for mass production of machine tools.