Which safety feature is noted for the MACK-1 system?

• A. High pressure warning at 1000 psi
• B. Low pressure whistle at 500 psi
• C. Audible alarm at 200 psi
• D. Visual indicator only

Answer: (B)

This question focuses on how safety systems alert operators to potentially dangerous pressure levels and why an audible low‑pressure warning is effective. The best choice describes a whistle that sounds when pressure drops to a moderate level, 500 psi, which provides an immediate, attention-getting cue that something is wrong before the pressure becomes too low to operate safely. This kind of alert gives actionable time to inspect for leaks, check valves, or initiate repressurization, helping prevent a shutdown or failure.

A warning for high pressure at 1000 psi addresses a different hazard and isn’t about preventing low‑pressure issues that can impair operation. An alarm at 200 psi could be too sensitive or not align with the system’s normal operating range, potentially causing nuisance alarms or insufficient time to react. A visual indicator only requires someone to look at a gauge, which may be missed in a busy or noisy work environment, delaying response.