Befähigungsprüfung Sprengungsunternehmen Practice Questions - Befähigungsprüfung Sprengungsunternehmen (Austria) Exam - Befähigungsprüfung Sprengungsunternehmen Practice Questions - Befähigungsprüfung Sprengungsunternehmen (Austria) Exam

Question 1

What is the typical density, detonation velocity (VOD), and key operational characteristic of gelatinous dynamites (e.g. Eurodyn / Donarit / Gelamon) used in Austrian commercial blasting?

High density (approx. 1.40 to 1.50 g/cm³), high detonation velocity (approx. 5,500 to 6,500 m/s), exceptional brisance, and outstanding water resistance. Low density (approx. 0.85 g/cm³), moderate detonation velocity (approx. 3,000 m/s), and no water resistance, requiring booster initiation. Very high density (approx. 2.0 g/cm³) with a deflagration velocity below 500 m/s and complete immunity to aging. A pourable slurry of pure nitroglycerin without oxidizer salts, detonating at over 8,000 m/s.

Correct Answer:

High density (approx. 1.40 to 1.50 g/cm³), high detonation velocity (approx. 5,500 to 6,500 m/s), exceptional brisance, and outstanding water resistance.

Question 2

What is the stoichiometric formulation and key physical limitation of standard bulk ANFO (Ammonium Nitrate / Fuel Oil, known in Austria as Andex)?

75% Potassium Nitrate and 25% Nitrocellulose; waterproof and cap-sensitive. 94.3% porous Ammonium Nitrate prills and 5.7% Fuel Oil (diesel); non-cap-sensitive, low density (~0.85 g/cm³), low VOD (~3,000 m/s), and zero water resistance. 50% TNT and 50% RDX; hypersensitive to minor electrostatic friction. 100% pure Ammonium Nitrate prills without any fuel component; fully cap-sensitive with maximum energy output.

Correct Answer:

94.3% porous Ammonium Nitrate prills and 5.7% Fuel Oil (diesel); non-cap-sensitive, low density (~0.85 g/cm³), low VOD (~3,000 m/s), and zero water resistance.

Question 3

How do modern commercial emulsion explosives (Emulsionssprengstoffe) achieve stable detonation sensitivity and high velocity?

By dissolving ammonium nitrate crystals in liquid nitroglycerin to form a pourable gel. By adding liquid nitroglycerin until the mixture becomes highly sensitive to impact. Through a water-in-oil emulsion structure containing microscopic droplets of aqueous nitrate oxidizer solution suspended in a continuous fuel/oil matrix, sensitized by microscopic hollow glass or plastic microspheres (Mikrohohlkugeln) that create adiabatic hot spots upon shock compression. By grinding oxidizer and fuel to sub-micron powder and pressing out all air voids to maximize density.

Correct Answer:

Through a water-in-oil emulsion structure containing microscopic droplets of aqueous nitrate oxidizer solution suspended in a continuous fuel/oil matrix, sensitized by microscopic hollow glass or plastic microspheres (Mikrohohlkugeln) that create adiabatic hot spots upon shock compression.

Question 4

What is the direct toxicological consequence of a strongly negative versus a strongly positive Oxygen Balance (Sauerstoffbilanz) in commercial blasting explosives?

A negative balance produces excess nitrogen oxides; a positive balance produces carbon monoxide. A negative balance raises detonation velocity beyond 8,000 m/s; a positive balance reduces it below 1,000 m/s. Oxygen balance affects only brisance and has no influence on fume composition. A negative oxygen balance (fuel-rich) generates lethal Carbon Monoxide (CO) gas, whereas a positive oxygen balance (oxidizer-rich) generates highly toxic Nitrogen Oxides (NOx / nitrous fumes).

Correct Answer:

A negative oxygen balance (fuel-rich) generates lethal Carbon Monoxide (CO) gas, whereas a positive oxygen balance (oxidizer-rich) generates highly toxic Nitrogen Oxides (NOx / nitrous fumes).

Question 5

Why is black powder (Schwarzpulver / Sprengpulver) specifically selected in dimensional stone quarrying (Natursteingewinnung for granite and marble blocks) rather than high-velocity dynamites?

Black powder deflagrates at subsonic velocities (~300 to 500 m/s), producing expanding gas volume that gently heaves and splits intact stone blocks along natural bedding planes without creating shattering micro-fissures. Black powder has a higher detonation velocity than pure TNT. Black powder detonates at about 7,000 m/s, pulverizing the stone into fine aggregate. Black powder is simply the cheapest explosive per kilogram, which is the sole reason for its selection.

Correct Answer:

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Prepare with the Befähigungsprüfung Sprengungsunternehmen Practice Questions - Befähigungsprüfung Sprengungsunternehmen (Austria) Exam practice quiz. This question bank includes 100 questions covering blasting, explosive, blast, primary, and bench. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Befähigungsprüfung Sprengungsunternehmen Practice Questions - Befähigungsprüfung Sprengungsunternehmen (Austria) Exam

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

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Befähigungsprüfung Sprengungsunternehmen Practice Questions - Befähigungsprüfung Sprengungsunternehmen (Austria) Exam

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