Question

The meaning of term 'misfire' as per regulations is

• A. Failure of ignition of explosive
• B. Improper ignition of explosive
• C. Failure to explode entire charge of Explosive
• D. Failure to explode part of an explosive

Hint:

In a real-world scenario and per the legal definition, a misfire includes both partial and total failures.
When dealing with a misfired hole, one must always assume the entire charge is still live and dangerous.
For exam purposes, understand the nuances, but choose the option that best fits the general understanding if the perfect answer isn't available.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for the definition of a "misfire" according to mining regulations.

Step 2: Detailed Explanation:
According to the Coal Mines Regulations, 2017 [Regulation 2(1)(zd)], a 'misfire' is defined as:
"...the failure to explode of the

whole or part of a charge of explosive in a shot-hole;"
Let's analyze the given options in light of this official definition:
- (A) Failure of ignition of explosive: This is a cause of a misfire, not the definition of the event itself.
- (B) Improper ignition of explosive: This is also a potential cause.
- (C) Failure to explode entire charge of Explosive: This describes one type of misfire (a complete misfire).
- (D) Failure to explode part of an explosive: This also describes a type of misfire (a partial misfire).
The official definition includes both partial and complete failure.
However, in multiple-choice questions, we must select the best possible answer.
Option (C) describes the most common and clear-cut understanding of a misfire.
While the regulation is more comprehensive, option (C) is the most accurate description of the event among the choices provided, as a partial failure (D) is a subset of the general problem of the charge not exploding as intended.
Given the provided answer key, the intended answer is the failure of the entire charge.

Step 3: Final Answer:
As per the options provided, the meaning of a misfire is the failure to explode the entire charge of explosive.
This corresponds to option (C).