CES Fundamentals & Core Principles 2

Question 1

What term describes the minimum diameter at which a specific explosive will reliably detonate?

Accepted Answer

Critical diameter

Answer

Critical diameter is the minimum charge diameter below which a detonation wave cannot be sustained in a given explosive.

Question 2

Which property of an explosive indicates its ability to do work as measured by the volume of gas produced per unit mass?

Accepted Answer

Gas volume

Answer

Gas volume (moles of gas per kilogram) is a key measure of an explosive's work capacity, as expanding gases do the mechanical work.

Question 3

What is the primary purpose of a booster in an explosive train?

Accepted Answer

To amplify the initiation signal to reliably detonate a less-sensitive main charge

Answer

A booster bridges the gap between a relatively weak initiator and a less-sensitive main explosive charge by amplifying the detonation wave.

Question 4

The Trauzl lead block test is used to measure which explosive property?

Accepted Answer

Strength (work capacity)

Answer

The Trauzl lead block test measures the volume expansion in a lead block caused by an explosive, providing a relative measure of strength.

Question 5

Which chemical compound is commonly used as a sensitizer in ANFO to increase its sensitivity and performance?

Accepted Answer

Aluminum powder

Answer

Aluminum powder is added to ANFO to increase its energy output and sensitivity, producing aluminum oxide and additional heat.

(CES) Certified Explosives Specialist Practice Test