Question

If the wet bulb temperature of air at a particular place in a mine is \(31^\circ\mathrm{C}\), then the velocity of air in that place should be

• A. More than \(1\ \mathrm{m/s}\)
• B. Less than \(1\ \mathrm{m/s}\)
• C. More than \(2\ \mathrm{m/s}\)
• D. Less than \(2\ \mathrm{m/s}\)

Hint:

Higher wet bulb temperatures require \[ \boxed{\text{Higher air velocity}} \] to maintain acceptable working conditions in underground mines.

Answer 1

The Correct Option is A

Step 1: Recall mine ventilation requirements. When the wet bulb temperature is high, increased air movement is required to improve heat removal and provide thermal comfort to mine workers.

Step 2: Apply the standard guideline. For a wet bulb temperature of approximately \[ 31^\circ\mathrm{C}, \] the recommended air velocity is \[ \boxed{>1\ \mathrm{m/s}.} \] Hence, \[ \boxed{\text{More than }1\ \mathrm{m/s}} \] is the correct answer. Therefore, \[ \boxed{(A)} \] is the correct answer.