Question

In opencast blasting, delay detonators are used to

• A. Increase noise
• B. Reduce vibration and control muck pile
• C. Reduce drilling depth
• D. Increase explosive strength

Hint:

Delay detonators improve blasting efficiency by \[ \boxed{ \text{Reducing vibration and controlling rock movement.} } \]

Answer 1

The Correct Option is B

Step 1: Recall the purpose of delay detonators. Delay detonators initiate explosive charges at predetermined time intervals rather than simultaneously.

Step 2: State their advantages. Sequential blasting \[ \begin{aligned} &\bullet\ \text{reduces ground vibration}, &\bullet\ \text{improves rock fragmentation}, &\bullet\ \text{controls the movement of the muck pile}. \end{aligned} \] Hence, \[ \boxed{\text{Reduce vibration and control muck pile}} \] is the correct answer. Therefore, \[ \boxed{(B)} \] is the correct answer.