What should you do with metal parts to reduce noise?

• A. Secure metal parts to prevent noise.
• B. Leave metal parts loose.
• C. Rub metal parts on fabric to muffle sound.
• D. Disassemble them.

Answer: (A)

Securing metal parts to prevent vibration reduces noise. When metal components aren’t fixed, they can vibrate and rattle during operation, converting some of the mechanical energy into sound. Fastening parts firmly with the right screws, bolts, brackets, and clamps, and adding spacers or dampers where needed, limits relative motion and cuts the paths through which noise travels. This addresses the root cause: unwanted movement between metal surfaces. Leaving parts loose invites rattling and louder noise, rubbing metal on fabric is only a superficial dampening that can wear materials and doesn’t stop the underlying vibration, and disassembling the assembly removes functionality and isn’t a practical noise-reduction method.