NCIDQ IDFX Practice Exam

What is an effective way to lower the sound created by fixed machinery in a space?

1. Soundproof the room completely

2. Enclose or modify the noise-producing machine

3. Ignore the sound

4. Reduce the number of hard surfaces in the room

The correct answer is: Enclose or modify the noise-producing machine

Enclosing or modifying the noise-producing machine is an effective strategy for lowering sound generated by fixed machinery in a space. When machinery operates, it typically generates noise due to its mechanical operations, vibrations, and air movement. By enclosing the machine within a sound-absorbing enclosure or by modifying its components (for example, adding insulation or using quieter machinery designs), the transmission of sound can be significantly reduced. This method targets the source of the noise directly, providing a more effective solution than attempting to treat the entire room or ignoring the issue altogether. This approach not only reduces the sound energy produced but can also improve the overall acoustics of the space, ensuring that sound levels remain within acceptable limits for comfort and safety. Enclosing machinery or altering its operation is a proactive step that directly impacts the noise output and can often be implemented alongside other strategies for further sound reduction.