Question

Stone dust barriers in underground coal mines are used to arrest

• A. Black damp explosions
• B. Air blast
• C. Firedamp explosions
• D. Coal dust explosions

Hint:

Stone dust barriers are a critical safety feature in coal mines, helping to mitigate the risk of devastating coal dust explosions.

Answer 1

The Correct Option is D

Stone dust barriers are safety measures in underground coal mines designed to prevent the propagation of coal dust explosions. These barriers consist of shelves or trays filled with stone dust (usually limestone) that are triggered to disperse the dust into the air during an explosion. The inert stone dust mixes with the coal dust, reducing its explosibility by diluting the mixture and absorbing heat, thus arresting the explosion. Black damp (carbon dioxide accumulation) and firedamp (methane) explosions are managed through ventilation and gas monitoring, while air blasts are unrelated to stone dust barriers.
Thus, the correct answer is Coal dust explosions.