Scheduled Mines Blasting Certificate Exam Practice Questions - Scheduled Mines Blasting Certificate of Competency Examination (South Africa) Exam - Scheduled Mines Blasting Certificate Exam Practice Questions - Scheduled Mines Blasting Certificate of Competency Examination (South Africa) Exam

Question 1

When pneumatic loading of loose bulk ANFO into underground blast holes in hard rock stopes, what safety precaution is essential regarding electrostatic discharge?

Use a conductive anti-static loading hose specifically grounded to the rock mass Moisten the ANFO with water prior to pouring into the hopper Use standard PVC plastic tubing to insulate the operator from ground Charge the blast holes using aluminum detonator shells only

Correct Answer:

Use a conductive anti-static loading hose specifically grounded to the rock mass

Question 2

In underground narrow-vein stoping, what is the primary operational mechanism of a chemical gassing agent added to a bulk emulsion matrix during charging?

It acts as a primary explosive fuel to increase detonating velocity It generates micro-gas bubbles that sensitize the matrix to detonation by shock wave compression It retards the detonation speed to allow better rock heave in friable ground It neutralizes toxic nitrogen dioxide fumes produced upon detonation

Correct Answer:

It generates micro-gas bubbles that sensitize the matrix to detonation by shock wave compression

Question 3

In a shock tube initiation network underground, what transmits the detonation signal through the hollow plastic tubing to the surface or detonator cap?

A low-velocity deflagration wave of explosive dust coating on the inner tube wall A high-voltage electrical pulse conducted along an inner copper filament A high-pressure pneumatic air pulse traveling at sonic velocity A liquid nitroglycerin core undergoing continuous detonation

Correct Answer:

A low-velocity deflagration wave of explosive dust coating on the inner tube wall

Question 4

What major advantage do programmable electronic detonators offer over conventional pyrotechnic delay detonators in hard-rock stoping and tunneling?

They eliminate the need for stemming material in blast holes They offer millisecond-accurate timing flexibility to optimize burden relief and reduce vibration They can detonate without requiring a booster or primer cartridge They are completely immune to water ingress and high hydrostatic pressures up to 100 bar

Correct Answer:

They offer millisecond-accurate timing flexibility to optimize burden relief and reduce vibration

Question 5

In underground hard-rock tunneling (drive development), what is the function of uncharged (reamed) large-diameter relief holes in a burn cut design?

To drain excess fissure water from the tunnel face before charging To provide a free face and expansion void for adjacent loaded cut holes to break into To act as anchor points for face scraper ropes after blasting To allow ventilation air to purge gases from deep behind the blast face

Correct Answer:

To provide a free face and expansion void for adjacent loaded cut holes to break into

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About this Exam

Prepare with the Scheduled Mines Blasting Certificate Exam Practice Questions - Scheduled Mines Blasting Certificate of Competency Examination (South Africa) Exam practice quiz. This question bank includes 100 questions covering blasting, underground, blast, face, and holes. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Scheduled Mines Blasting Certificate Exam Practice Questions - Scheduled Mines Blasting Certificate of Competency Examination (South Africa) Exam

This practice set contains 100 questions from the matching question bank and focuses on blasting, underground, blast, face, and holes. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Scheduled Mines Blasting Certificate Exam Practice Questions - Scheduled Mines Blasting Certificate of Competency Examination (South Africa) Exam

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