Question

The maximum wet-bulb temperature at working faces as required under mines regulations is

• A. 36°C
• B. 33°C
• C. 30°C
• D. 27°C

Hint:

Wet-bulb temperature is a key indicator of heat stress, combining the effects of temperature and humidity in mines.

Answer 1

The Correct Option is B

Under the Coal Mines Regulations (CMR) 2017 in India, the maximum permissible wet-bulb temperature at working faces in underground mines is set to ensure safe working conditions, particularly to prevent heat stress. The regulation specifies that the wet-bulb temperature should not exceed 33°C at the working face, as higher temperatures can lead to health risks for miners. Options 36°C and 30°C are outside this limit, and 27°C, while safer, is not the regulatory maximum. Thus, the correct answer is 33°C.