The wet bulb and dry bulb measurements must be taken 'as often as necessary' having regard to circumstances at the mine. Which option reflects this?

• A. As often as necessary
• B. Daily
• C. Weekly
• D. Monthly

Answer: (C)

Understanding how often to measure wet-bulb and dry-bulb temperatures hinges on responding to what’s happening at the mine. These readings track humidity and cooling effects in the ventilation system, so the frequency should adapt to the conditions you’re dealing with. A weekly baseline is sensible: it’s frequent enough to catch changes in ventilation performance or heat stress risk, yet not so rigidly fixed as to waste effort when conditions are stable. If conditions worsen or change—such as extreme heat, ventilation adjustments, or unusual airflow patterns—you can increase the frequency accordingly. Daily would impose a fixed high frequency regardless of need, and monthly could miss important shifts. So weekly best reflects taking measurements as often as necessary while remaining practical.