Question

In underground mining, what is the main factor contributing to dust explosions?

• A. Presence of water vapour
• B. Accumulation of fine coal dust in suspension
• C. Accumulation of coal
• D. Less ventilation

Hint:

A coal dust explosion requires \[ \boxed{ \text{Fine coal dust + Air + Ignition source.} } \]

Answer 1

The Correct Option is B

Step 1: Recall the condition required for a dust explosion. A dust explosion occurs when fine combustible coal dust becomes suspended in air and is ignited by a suitable ignition source.

Step 2: Identify the primary contributing factor. The most important factor is \[ \boxed{\text{Accumulation of fine coal dust in suspension}.} \] Hence, \[ \boxed{(B)} \] is the correct answer.