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100+ Free AZ ROC CR-15 Blasting Practice Questions

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Key Facts: AZ ROC CR-15 Blasting Exam

80 Questions

Official Question Count

PSI Content Outline

210 Minutes

Time Limit

PSI Content Outline

70%

Passing Score

Arizona Registrar of Contractors

$66

Exam Fee

PSI Services LLC

Open Book Computerized MCQ

Exam Format

PSI / AZ ROC Guidelines

100 Questions

Practice Question Bank

OpenExamPrep Practice Bank

The Arizona ROC CR-15 Blasting Examination consists of 80 multiple-choice questions administered in a 210-minute open-book PSI computer-delivered session with a 70% passing threshold ($66 exam fee). This online practice bank provides 100 realistic English-language practice questions with comprehensive technical explanations and mathematical step-by-step solutions.

Sample AZ ROC CR-15 Blasting Practice Questions

Try these sample questions to test your AZ ROC CR-15 Blasting exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to ATF 27 CFR Part 555 regulations, what are the standard wall construction requirements for a Type 1 permanent outdoor high explosives storage magazine?
A.Minimum 1/8-inch sheet steel lined with 2 inches of exterior plywood
B.Minimum 1/4-inch steel exterior lined with 4 inches of solid hardwood or equivalent interior masonry
C.Double-walled 18-gauge sheet metal with hollow fiberglass insulation cavity
D.Reinforced concrete minimum 2 inches thick with aluminum interior paneling
Explanation: ATF 27 CFR Part 555 specifies that Type 1 permanent outdoor magazines for high explosives must be bullet-resistant, fire-resistant, weather-resistant, and theft-resistant. Standard steel wall construction requires an outer shell of at least 1/4-inch steel lined with 4 inches of hardwood or 6 inches of sand/masonry filler to guarantee bullet resistance.
2Under ATF 27 CFR Part 555 regulations, by when must a licensed blaster record a daily summary of magazine transactions (acquisitions and removals) in their permanent explosives record book?
A.Immediately upon physical placement, prior to firing
B.By the close of the next business day following the transaction
C.Within 7 calendar days of the transaction
D.At the end of each calendar month during inventory reconciliation
Explanation: ATF regulations require that daily summaries of magazine transactions (including manufacturer name, quantity, date, and transaction details) be entered into the permanent inventory record no later than the close of the next business day following the acquisition or removal of explosive materials.
3When locating an outdoor explosives storage magazine, how is the mandatory minimum separation distance to inhabited buildings determined under ATF regulations?
A.Fixed uniform distance of 500 feet regardless of explosive weight
B.Calculated using the ATF American Table of Distances (ATD) based on the total net explosive weight (NEW) and barricading conditions
C.Determined solely by local county zoning board discretion
D.Based strictly on the height of the magazine roof above sea level
Explanation: Separation distances between explosive magazines and inhabited buildings, public highways, and passenger railways are mandated by the ATF American Table of Distances (27 CFR 555.218). The required distance increases proportionally with the total Net Explosive Weight (NEW) stored and can be reduced by 50% if effective artificial or natural barricades are present.
4What is the primary operational rule regarding the use of an ATF Type 3 explosives storage magazine (Day Box)?
A.It may be used for permanent unattended storage of high explosives for up to 30 days
B.It is used for temporary storage while attended, and all unused explosives must be returned to a Type 1 or 2 magazine at the end of the work shift
C.It is designed exclusively for storing non-explosive drill bits and tamping poles
D.It requires a minimum 12-inch concrete floor slab when placed on a truck bed
Explanation: An ATF Type 3 magazine (Day Box) is a fire-resistant, weather-resistant, and theft-resistant portable magazine designed for temporary transport and field storage while attended. At the conclusion of the shift or work day, all unused explosive materials must be returned to a permanent Type 1 or Type 2 magazine.
5Under ATF 27 CFR 555.213, what are the minimum lock specifications for an outdoor Type 1 or Type 2 high explosives magazine?
A.One single-tumbler combination lock with a plastic protective cover
B.Two 5-tumbler padlocks for each door, equipped with solid steel shackles or protected by 3/8-inch steel hoods
C.Standard commercial brass cabinet locks with 1/8-inch shackles
D.Keyless electronic push-button keypad locks powered by internal batteries
Explanation: ATF regulations require outdoor explosive storage doors to be secured with two 5-tumbler padlocks (key-changeable or master-keyed), constructed with hardened steel shackles, or encased within 3/8-inch steel protective hoods to resist bolt cutters and physical tampering.
6What is the mandatory minimum distance required between an ATF magazine containing high explosives (such as dynamite) and a separate magazine containing blasting caps (detonators)?
A.10 feet
B.25 feet
C.At least 50 feet, or separated in accordance with the ATF separation distances for detonators
D.150 feet regardless of detonator quantity
Explanation: Blasting caps/detonators must never be stored in the same magazine with other explosive materials. When stored in separate magazines, they must be separated by a minimum distance of 50 feet (or greater as dictated by the ATF Table of Separation Distances for Detonators depending on quantity).
7What clearance radius of dry vegetation, brush, and combustible debris must be maintained around an outdoor explosives storage magazine under ATF guidelines?
A.10 feet
B.25 feet
C.50 feet
D.100 feet
Explanation: ATF regulations require that the area surrounding an outdoor explosives storage magazine be kept clear of dry grass, brush, leaves, trash, and combustible material for a distance of at least 25 feet in all directions to prevent wildland fires from igniting the structure.
8Smoking, open flames, or spark-producing devices are strictly prohibited within what minimum distance of any explosives storage magazine or loading area?
A.15 feet
B.25 feet
C.50 feet
D.100 feet
Explanation: Both ATF and OSHA regulations strictly mandate that smoking, open flames, matches, lighters, and spark-producing devices are prohibited within 50 feet of any explosives storage magazine, vehicle transport, or blast loading area.
9Which explosive materials are permitted to be stored in an ATF Type 4 storage magazine?
A.High explosives such as nitroglycerin dynamite and cast PETN boosters
B.Low explosives such as black powder, safety fuse, and electric squibs
C.Detonators containing more than 10 grams of high explosive core
D.Bulk liquid nitromethane Sensitizer solutions
Explanation: Type 4 magazines are fire-resistant, weather-resistant, and theft-resistant structures approved exclusively for the storage of low explosives (e.g., black powder, safety fuse, igniter cord). High explosives (like dynamite or PETN boosters) require Type 1 or Type 2 bullet-resistant magazines.
10Upon discovering the theft or loss of explosive materials from a job site or magazine, within what timeframe must the licensee notify the ATF and local law enforcement authorities?
A.Within 24 hours of discovery
B.Within 48 hours of discovery
C.Within 5 business days
D.At the end of the monthly billing cycle
Explanation: Under 27 CFR 555.165, a Federal Explosives Licensee or Permittee must report any theft or loss of explosive materials within 24 hours of discovery to both the ATF (toll-free hotline 1-800-800-3855) and local municipal/county law enforcement.

About the AZ ROC CR-15 Blasting Exam

The Arizona ROC CR-15 Blasting Examination is a computer-delivered open-book trade examination administered by PSI Services LLC for the Arizona Registrar of Contractors. The exam tests comprehensive commercial, residential, and heavy engineering blasting practices, including ATF 27 CFR Part 555 explosive storage and recordkeeping, OSHA 1926 Subpart U and MSHA blasting safety, burden/spacing/powder factor blast design math, electric and non-electric initiation circuit design, USBM RI 8507 ground vibration/airblast limits, and explosive chemical properties.

Questions

80 scored questions

Time Limit

210 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC CR-15 Blasting Exam Content Outline

40%

Explosives, Design, and Shot Preparation

32 of 80 items on the official PSI content outline. Explosive products and properties, blast design, drilling patterns, loading, stemming, initiation systems and delays.

30%

Storage

24 of 80 items on the official PSI content outline. ATF magazine types, construction, location and distance tables, inventory records and security.

25%

Safety

20 of 80 items on the official PSI content outline. OSHA 29 CFR 1926 Subpart U and MSHA rules, blast-area security, misfires, vibration and airblast control.

5%

Transportation

4 of 80 items on the official PSI content outline. DOT requirements for transporting explosive materials, placarding, segregation and vehicle rules.

How to Pass the AZ ROC CR-15 Blasting Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 80 questions
  • Time limit: 210 minutes
  • Exam fee: $66

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

AZ ROC CR-15 Blasting Study Tips from Top Performers

1Master ATF 27 CFR Part 555 magazine specifications (Types 1-5), padlock standards (two 5-tumbler padlocks or 3/8" steel hoods), and American Table of Distances (ATD) separation requirements.
2Memorize OSHA 1926 Subpart U and MSHA misfire wait times (15 minutes for electric circuits, 30 minutes for safety fuse / non-electric shock tube).
3Practice scaled distance calculations: SD = Distance / sqrt(Weight per 8ms delay window), and solving for safe max explosive weight per delay W = (D / SD)^2.
4Understand USBM RI 8507 peak particle velocity (PPV) limits: 0.75 in/sec at low frequencies (<10 Hz) for modern drywall, up to 2.0 in/sec at high frequencies (>40 Hz), and peak airblast overpressure limit of 134 dBL.
5Study ANFO chemical proportions (94% ammonium nitrate / 6% fuel oil) and how oxygen imbalances create hazardous toxic fumes (CO for rich, NOx for lean).

Frequently Asked Questions

How many questions are on the official Arizona ROC CR-15 Blasting exam?

The official PSI CR-15 Blasting content outline lists 80 multiple-choice questions with 210 minutes allowed.

What passing score is required for the AZ ROC CR-15 exam?

A minimum passing score of 70% (56 correct out of 80 questions) is required to pass the trade exam.

Is the Arizona ROC CR-15 Blasting exam open book?

Yes, the examination is open-book. Approved reference materials, including ATF 27 CFR Part 555, OSHA 29 CFR 1926 Subpart U, and the ISEE Blasters' Handbook, may be brought into the PSI test center.

What topic areas carry the highest weight on the CR-15 exam?

Explosives, Design, and Shot Preparation is the largest area at 32 of 80 items (40%), followed by Storage at 24 items (30%), Safety at 20 items (25%), and Transportation at 4 items (5%), per the PSI CR-15 content outline.

Where can I schedule the AZ ROC CR-15 Blasting exam?

Examinations are scheduled online through PSI Services LLC at https://test-takers.psiexams.com/azcon or by calling PSI candidate services.