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100+ Free NV A-20 Industrial Piping Practice Questions

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2026 Statistics

Key Facts: NV A-20 Industrial Piping Exam

40 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada A-20 Industrial Piping Contractor Examination is the official NSCB/PSI open book exam: 40 questions, 70% (28 of 40 points), 1.5 hours, USD 95 (bulletin 291, updated 3/25/2026). Official delivery: English.

Sample NV A-20 Industrial Piping Practice Questions

Try these sample questions to test your NV A-20 Industrial Piping exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Before opening a steam or chemical process line for repair, the Nevada A-20 crew's first safety control is to:
A.Isolate the line, relieve stored energy, and apply lockout/tagout
B.Increase system pressure so residual fluid is forced out of the joint
C.Crack the nearest flange while the line is still at operating pressure
D.Purge the line with pure oxygen to clear residual product
Explanation: Industrial piping stores pressure, heat, and sometimes toxic product. OSHA lockout/tagout requires isolation, energy release, and a lock/tag before anyone opens a flange, valve, or weld. That sequence prevents a sudden release of steam, gas, or chemical.
2Which medium is prohibited for pressure-testing industrial piping?
A.Oxygen
B.Dry nitrogen
C.Clean water
D.Compressed air on metallic pipe
Explanation: Oxygen supports combustion and can ignite oil, grease, or metal fines inside a pipe. UMC hydronic and fuel-gas tests allow water, air, carbon dioxide, or nitrogen as appropriate, never oxygen. Use an inert gas or water instead.
3A fitter grinding a carbon-steel steam weld should wear, at minimum:
A.A cloth dust mask and ordinary eyeglasses
B.Only leather gloves, because sparks stay below eye level
C.Safety glasses with side shields or a face shield plus hearing protection as needed
D.A welding helmet with no filter lens
Explanation: Grinding throws hot particles and noise. Eye and face protection with side coverage is the baseline, and hearing protection is added when the operation is loud. Ordinary glasses and a cloth mask do not stop flying slag.
4A vault or tank pit used to install industrial piping is treated as a confined space primarily because it:
A.Has limited entry and may contain a hazardous atmosphere
B.Always contains potable water
C.Is shallower than 12 inches
D.Is painted safety yellow
Explanation: OSHA confined-space rules apply when entry is limited and the space can trap a worker or hold a hazardous atmosphere. Industrial piping vaults often collect gas, argon, nitrogen, or oxygen-deficient air. Test the atmosphere and follow the permit program before entry.
5Welding on an in-place industrial piping system normally requires a hot-work permit so that:
A.Combustibles, flammable atmospheres, and fire watch are controlled before the arc is struck
B.The welder can skip fire watch if the pipe is wet
C.The building fire alarm can be permanently disabled
D.Oxygen can be used to accelerate the weld
Explanation: Hot-work permits force a check for flammable residue, nearby combustibles, and a fire watch. Industrial steam, gas, and chemical lines can hold residual product that ignites from slag. The permit is a control process, not a license to disable alarms or use oxygen.
6On an industrial piping site, a hard hat is required mainly to protect against:
A.Struck-by hazards from pipe, fittings, and overhead loads
B.Sunburn only
C.Hearing loss from steam leaks
D.Chemical absorption through the scalp
Explanation: Pipe, valves, and rigging create struck-by and falling-object hazards. A hard hat is the basic head protection for those impacts. It is not hearing protection and is not a chemical barrier.
7Under OSHA lockout/tagout, an authorized employee is the person who:
A.Only observes the work from outside the barricade
B.Holds the plant keys but has no isolation training
C.Performs the lockout and is trained to isolate that energy source
D.Removes any lock that is slowing production
Explanation: Authorized employees are trained to shut down, isolate, lock, and verify zero energy. Affected employees operate the equipment but do not apply the lockout. Only the worker who applied a lock, or a documented emergency procedure, may remove it.
8During a pneumatic pressure test of a large-diameter industrial line, the safest practice is to:
A.Barricade the test area, raise pressure in steps, and keep personnel clear of joints
B.Stand at the blinded end to listen for leaks
C.Use the highest available compressor setting to shorten the test
D.Leave all vents and drains open so pressure cannot build
Explanation: Compressed gas stores far more energy than water. A joint failure can launch blinds, gauges, or pipe. Raise pressure in increments, hold, inspect from a safe position, and keep nonessential people out of the line of fire.
9Before selecting gasket, valve, and pipe materials for a chemical service, the A-20 contractor should first consult:
A.The safety data sheet and the owner's material compatibility specification
B.The paint color of the existing plant piping
C.A residential plumbing fixture catalog
D.Only the pump nameplate voltage
Explanation: Chemical compatibility is a safety and integrity issue. The SDS identifies the fluid, and the owner's specification or a compatibility chart tells which alloys, elastomers, and plastics are acceptable. Guessing from paint color or plumbing catalogs is how the wrong elastomer ends up in acid service.
10An atmosphere is oxygen-deficient, and entry is unsafe without additional controls, when oxygen falls below:
A.23.5 percent
B.21.0 percent
C.19.5 percent
D.16.0 percent only if the space is also hot
Explanation: OSHA treats oxygen below 19.5 percent as oxygen-deficient. Nitrogen purging, rusting tanks, and decaying organics in pits can drive oxygen down without any obvious odor. Test before entry; do not wait for symptoms.

About the NV A-20 Industrial Piping Exam

The Nevada A-20 Industrial Piping Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 40 scored questions. Passing is 70% (28 of 40 points) in 1.5 hours. The examination is open book. Approved center references include Uniform Mechanical Code, 2018 (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Open Book computer-based multiple-choice. Uniform Mechanical Code, 2018 (allowed in center)

Time Limit

1.5 hours

Passing Score

70% (28 of 40 points)

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV A-20 Industrial Piping Exam Content Outline

18%

Safety

Industrial piping safety (7 items)

20%

Piping

Industrial process piping (8 items)

20%

Equipment

Pumps and process equipment (8 items)

5%

Valves and Controls

Valves and controls (2 items)

20%

Hydronics

Hydronic piping (8 items)

18%

Excavation

Related excavation (7 items)

How to Pass the NV A-20 Industrial Piping Exam

What You Need to Know

  • Passing score: 70% (28 of 40 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Mechanical Code, 2018 (allowed in center)
  • Time limit: 1.5 hours
  • Exam fee: USD 95

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

NV A-20 Industrial Piping Study Tips from Top Performers

1Distribute study time to the official bulletin 291 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada A-20 Industrial Piping Contractor Examination?

The official PSI examination has 40 scored questions. Passing is 70% (28 of 40 points) within 1.5 hours (Candidate Information Bulletin 291, updated 3/25/2026).

How much does the NV A-20 Industrial Piping exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV A-20 Industrial Piping exam open book?

Yes. PSI lists this examination as open book. Uniform Mechanical Code, 2018 (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.