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100+ Free AZ ROC C-74 Boilers, Piping & Solar Practice Questions

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Key Facts: AZ ROC C-74 Boilers, Piping & Solar Exam

50 Questions (+30 Solar)

Official Question Count

PSI C-74 Content Outline

120 Minutes (+75 Solar)

Time Limit

PSI C-74 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 C-74/CR-74 Boilers, Steamfitting and Process Piping Including Solar Examination consists of 50 multiple-choice questions administered in a 120-minute open-book PSI session, plus a separate 30-question / 75-minute solar examination with a 70% passing requirement ($66 exam fee). This online practice question bank provides 100 realistic practice questions with step-by-step technical explanations and worked code calculations adapted for exam preparation.

Sample AZ ROC C-74 Boilers, Piping & Solar Practice Questions

Try these sample questions to test your AZ ROC C-74 Boilers, Piping & Solar exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to ASME Boiler and Pressure Vessel Code (BPVC) Section I, what is the defining operating threshold that classifies a steam boiler as a Power Boiler rather than a Heating Boiler governed by Section IV?
A.Operating steam pressure exceeding 15 psig (103 kPa)
B.Operating steam pressure exceeding 50 psig (345 kPa)
C.Water temperature exceeding 200°F (93°C) regardless of pressure
D.Total heat input capacity exceeding 200,000 BTU/hr
Explanation: ASME BPVC Section I governs Power Boilers, which are defined as steam or vapor boilers operating at pressures exceeding 15 psig (103 kPa), or high-temperature water boilers operating at pressures exceeding 160 psig or temperatures exceeding 250°F. Steam boilers operating at or below 15 psig are classified as low-pressure heating boilers under ASME Section IV.
2Under ASME BPVC Section I (PG-67), what is the maximum allowable pressure rise above the Maximum Allowable Working Pressure (MAWP) on a power boiler equipped with a single safety valve during a full-capacity discharge test?
A.6% above MAWP
B.10% above MAWP
C.15% above MAWP
D.3% above MAWP
Explanation: ASME Section I PG-67.3 specifies that when a single safety valve is used on a power boiler, its relieving capacity must prevent the pressure from rising more than 6% above the Maximum Allowable Working Pressure (MAWP). When multiple safety valves are used, the pressure accumulation must not exceed 6% above MAWP when all valves are discharging.
3For a low-pressure hot water heating boiler governed by ASME Section IV (HG-400.2), what is the maximum set pressure permitted for the pressure relief valve?
A.160 psig
B.30 psig
C.15 psig
D.100 psig
Explanation: ASME Section IV HG-400.2 allows safety relief valves on hot water heating boilers to be set at a maximum pressure of 160 psig (which corresponds to the upper pressure boundary for Section IV hot water boilers). Standard residential/commercial hot water boilers are often set at 30 psig, but the maximum code limit for Section IV hot water boilers is 160 psig.
4Under ASME BPVC Section VIII Division 1 (UG-99), what is the standard minimum hydrostatic test pressure multiplier required for a newly constructed pressure vessel?
A.1.3 times the MAWP multiplied by the stress ratio
B.1.5 times the MAWP multiplied by the stress ratio
C.1.1 times the MAWP multiplied by the stress ratio
D.2.0 times the MAWP multiplied by the stress ratio
Explanation: Under ASME BPVC Section VIII Division 1 UG-99(b), the standard minimum hydrostatic test pressure at every point in the vessel is 1.3 times the Maximum Allowable Working Pressure (MAWP) multiplied by the ratio of allowable stress at test temperature to allowable stress at design temperature. (Note: Prior to 1999 it was 1.5x, but the current UG-99 standard factor is 1.3x).
5What is the minimum pipe size required for the water column connections to a Section I power boiler shell or drum under ASME BPVC PG-60?
A.1 inch (NPS 1)
B.3/4 inch (NPS 3/4)
C.1/2 inch (NPS 1/2)
D.1-1/2 inches (NPS 1-1/2)
Explanation: ASME BPVC Section I PG-60.1.6 requires that pipe or tubing connections between the water column and the boiler drum/shell must not be less than NPS 1 (1 inch). Brass, copper, or steel pipe must be used, and cross tees must be provided at right-angle turns to allow cleaning of scale.
6Under ASME Section I (PG-59.3), when a power boiler operates at a pressure exceeding 100 psig (690 kPa), how many blowoff valves are required on the bottom blowoff line?
A.Two slow-opening valves, or one quick-opening and one slow-opening valve in series
B.One single slow-opening globe valve
C.Two quick-opening lever valves in series
D.One check valve and one gate valve
Explanation: ASME Section I PG-59.3.2 mandates that power boilers operating over 100 psig must have two blowoff valves in series on each bottom blowoff line. These may be two slow-opening valves, or one quick-opening valve combined with one slow-opening valve (with the quick-opening valve placed closest to the boiler drum).
7According to the National Board Inspection Code (NBIC) and ASME standards, what is the maximum temperature of blowdown water permitted to discharge directly into a public sewer system without passing through a blowoff vessel?
A.140°F (60°C)
B.180°F (82°C)
C.212°F (100°C)
D.100°F (38°C)
Explanation: Under NBIC and general plumbing/environmental codes (IPC 701.7), water discharged into a public sewer must not exceed 140°F (60°C). High-temperature boiler blowdown must pass through a blowoff separator or cooling tank to flash off steam and cool effluent to 140°F or lower before entry into public municipal piping.
8Under ASME Section I PG-61, power boilers having more than how many square feet of water-heating surface must be equipped with at least two independent means of feeding water?
A.500 sq ft (46.5 sq m)
B.100 sq ft (9.3 sq m)
C.1,000 sq ft (92.9 sq m)
D.250 sq ft (23.2 sq m)
Explanation: ASME Section I PG-61.1 mandates that boilers having more than 500 sq ft of heating surface must have at least two independent means of supplying feedwater. For boilers fired by solid fuel not in suspension, two sources are required if heating surface exceeds 100 sq ft.
9When conducting a hydrostatic pressure test on a newly installed ASME Section I power boiler (PG-99), what is the required test pressure relative to the MAWP?
A.1.5 times the MAWP
B.1.25 times the MAWP
C.1.3 times the MAWP
D.2.0 times the MAWP
Explanation: ASME Section I PG-99 specifies that completed power boilers must be subjected to a hydrostatic test of 1.5 times the Maximum Allowable Working Pressure (MAWP). During the test, safety valves must be gagged or removed and blank flanged.
10What is the lowest permissible location for the bottom sight glass nut on a Section IV low-pressure steam heating boiler relative to the lowest safe water level?
A.At least 1 inch (25 mm) above the lowest safe water level specified by the manufacturer
B.Exactly level with the top of the boiler crown sheet
C.At least 3 inches below the water line
D.At the exact center of the steam drum
Explanation: ASME Section IV HG-602 requires that the lowest visible part of the water gauge glass must be at least 1 inch (25 mm) above the lowest permissible water level as determined by the boiler manufacturer.

About the AZ ROC C-74 Boilers, Piping & Solar Exam

The Arizona ROC C-74/CR-74 Boilers, Steamfitting and Process Piping Including Solar Examination is a 50-question, 120-minute open-book computer-administered trade exam managed by PSI Services LLC for the Arizona Registrar of Contractors. It evaluates comprehensive technical knowledge across high and low pressure boilers (ASME Sec I & IV), pressure vessel design (Sec VIII), burner controls (ASME CSD-1), power and process piping codes (ASME B31.1 & B31.3), steam trap sizing, hydronic heating loops, solar thermal collector arrays and heat exchangers, ASME Section IX welder qualifications, fuel gas piping under IFGC/NFPA 54, and OSHA 1926 construction safety.

Assessment

Two separately scored PSI examinations, both open book and both requiring 70%: the main trade examination (50 questions / 120 minutes) and the solar examination (30 questions / 75 minutes). Solar content outline: Collection Loops (5), Components (4), Installation (5), Maintenance (2), Mounting (4), Principles (5), Solar Systems Piping (5).

Time Limit

120 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC C-74 Boilers, Piping & Solar Exam Content Outline

20%

Boilers

10 of 50 items on the official PSI content outline. Steam and hot water boiler types, trim, mountings and operation.

12%

Steam and Hot Water Piping

6 of 50 items on the official PSI content outline. Distribution mains, condensate return, expansion and supports.

12%

Gas Piping

6 of 50 items on the official PSI content outline. Fuel gas sizing, materials, joints, shutoffs and leak testing.

12%

Process Piping

6 of 50 items on the official PSI content outline. Industrial process piping materials, joining, supports and code requirements.

10%

Burners

5 of 50 items on the official PSI content outline. Burner types, combustion air, fuel trains and light-off sequence.

10%

Controls

5 of 50 items on the official PSI content outline. Operating and limit controls, low-water cutoffs and safety interlocks.

8%

Flues and Vents

4 of 50 items on the official PSI content outline. Venting categories, sizing, materials, terminations and draft.

8%

Sizing and Estimating

4 of 50 items on the official PSI content outline. Heat-loss and equipment sizing plus material and labor takeoffs.

8%

Testing and Inspection

4 of 50 items on the official PSI content outline. Hydrostatic and operational testing, and required inspections.

How to Pass the AZ ROC C-74 Boilers, Piping & Solar Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: Two separately scored PSI examinations, both open book and both requiring 70%: the main trade examination (50 questions / 120 minutes) and the solar examination (30 questions / 75 minutes). Solar content outline: Collection Loops (5), Components (4), Installation (5), Maintenance (2), Mounting (4), Principles (5), Solar Systems Piping (5).
  • Time limit: 120 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 C-74 Boilers, Piping & Solar Study Tips from Top Performers

1Master ASME Section I and Section IV rules for safety valve capacity calculations, blowdown valve requirements, gauge glass locations, and MAWP limits.
2Understand ASME B31.3 pressure design formulas for pipe wall thickness: t = (P * D) / [2 * (S*E + P*Y)] and B31.1 hydrostatic test multipliers (1.5x design pressure).
3Study ASME CSD-1 controls for low water cutoffs (LWCO), manual resets, high limit controls, and safety shutoff valve proof-of-closure switches.
4Learn solar thermal system design principles: closed-loop glycol sizing, double-wall heat exchanger isolation rules for potable water, differential controllers, and stagnation temperature handling.
5Review OSHA 29 CFR 1926 standards for rigging safety, gas cylinder separation (20 ft or 5-ft 1/2-hour fire barrier), permit-required confined spaces in boiler drums, and trench safety.

Frequently Asked Questions

How many questions are on the official Arizona ROC C-74/CR-74 Boilers, Steamfitting, Process Piping & Solar exam?

The official PSI C-74 (CR-74) content outline lists 50 questions with 120 minutes allowed for the main trade examination, plus a separate C-74 Solar examination of 30 questions with 75 minutes allowed.

What passing score is required for the AZ ROC C-74 exam?

A minimum passing score of 70% is required on each examination: 35 correct out of 50 on the trade portion and 21 correct out of 30 on the solar portion.

Is the Arizona ROC C-74 Boilers and Process Piping exam open book?

Yes, the examination is open-book. Approved reference materials—such as the ASME Boiler and Pressure Vessel Codes, ASME B31.1, ASME B31.3, International Mechanical Code, International Fuel Gas Code, and OSHA 29 CFR 1926—may be brought into the PSI test center.

What topics carry the highest weight on the C-74 trade exam?

ASME Boiler & Pressure Vessel Code (18%) and ASME B31 Power/Process Piping Codes (18%) carry the highest weight, followed by Steamfitting & Condensate Systems (14%) and Solar Thermal Systems (14%).

Where can I schedule the AZ ROC C-74 Boilers, Steamfitting & Process Piping examination?

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