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100+ Free NV A-19A Water Pipelines Practice Questions

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2026 Statistics

Key Facts: NV A-19A Water Pipelines 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

Closed Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada A-19A Pipelines and Conduits for Water Contractor Examination is the official NSCB/PSI closed 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-19A Water Pipelines Practice Questions

Try these sample questions to test your NV A-19A Water Pipelines exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to the DIPRA Installation Guide for Ductile Iron Pipe, what hydrostatic test is recommended for a newly installed water main?
A.At least 1.5 times the stated working pressure at the lowest elevation of the test section, held for two hours
B.Equal to the stated working pressure at the highest elevation, held for 30 minutes
C.Twice the stated working pressure at mid-length, held for 24 hours
D.50 psi above atmospheric pressure at any hydrant, held for 15 minutes
Explanation: DIPRA recommends testing at least 1.5 times the stated working pressure at the lowest elevation of the test section for two hours. The line is filled slowly, high points are vented until a steady stream of water appears, and makeup water is measured after the test pressure is reached. ANSI/AWWA C600 uses the same two-hour hold and also requires not less than 1.25 times working pressure at the highest point.
2What minimum flushing velocity does DIPRA, citing ANSI/AWWA C651, use when sizing openings to flush a new water main?
A.1.0 foot per second
B.2.0 feet per second
C.3.0 feet per second
D.5.0 feet per second
Explanation: DIPRA Table 9 is taken from ANSI/AWWA C651 and is based on a flushing velocity of 3.0 ft/sec (0.91 m/sec) at 40 psi residual in the main. That velocity is intended to move construction debris and sediment before disinfection and bacteriological sampling.
3How is a ductile-iron push-on joint assembled?
A.The gasket is seated in the bell groove and the beveled plain end is pushed into the bell to compress the gasket
B.The gasket is glued to the spigot and the bell is heated until the joint fuses
C.A lead-and-oakum pour is packed into the bell after the pipe is stabbed
D.The joint is threaded and made up with pipe dope and a chain wrench
Explanation: A push-on joint uses a special bell with an internal groove that holds a rubber gasket. After the bell and plain end are cleaned, the gasket is seated and the beveled spigot is pushed home, compressing the gasket into a watertight seal. Manufacturer gaskets are not interchangeable between joint designs.
4Why does DIPRA require bell holes at each ductile-iron joint?
A.To store extra polyethylene film and unused gaskets next to the joint
B.So the entire pipe can hang free of the trench bottom until the hydrostatic test is finished
C.To create a sump that collects groundwater away from the pipe barrel
D.So the joint can be assembled and the pipe barrel can rest evenly on the trench bottom
Explanation: Bell holes must be excavated at each joint, but only as large as needed for assembly (including polyethylene overlap) so the barrel bears uniformly on the trench bottom. If the bell rests on the bottom and the barrel spans, the pipe is point-loaded and can deflect or leak.
5When pipe laying stops for the day, what should be done with the open end of a water main?
A.Leave it open so air can circulate and dry the cement-mortar lining
B.Close it with a watertight plug that can be vented before removal
C.Stuff rags in the bell and cover the trench with plywood only
D.Cap it with polyethylene film taped to the coating
Explanation: DIPRA requires a watertight plug or other owner-approved closure whenever laying is not in progress. The plug should be vented so pressure can be released before removal, and the crew must prevent flotation if the trench floods. Open ends admit dirt, animals, and groundwater that later fail disinfection.
6What is the primary purpose of polyethylene encasement on ductile-iron water pipe?
A.To make the joint completely airtight and watertight
B.To increase the pipe's internal working-pressure rating by one pressure class
C.To isolate the pipe from corrosive soils as described in ANSI/AWWA C105
D.To replace the need for bedding and haunching around the barrel
Explanation: Polyethylene encasement per ANSI/AWWA C105/A21.5 is DIPRA's standard external-corrosion control. The film should fit the pipe contour, keep soil off the metal, and be repaired if damaged, but it is not intended to be completely airtight or watertight.
7How should unused synthetic-rubber push-on and mechanical-joint gaskets be stored on a water-main job?
A.In a cool location out of direct sunlight, with no contact with petroleum products
B.Soaked in diesel fuel so they stay flexible in desert heat
C.Stacked on the hot asphalt berm so they warm before installation
D.Hung on the excavator boom where they can air-dry after rain
Explanation: DIPRA specifies cool storage out of sunlight and away from petroleum products. SBR gaskets last for years if stored that way and should be used first-in, first-out. In cold weather they are warmed before installation; looping a gasket before use checks for cracking.
8In normal open-cut installation, which end of a ductile-iron pipe is pushed into the pipe already in the trench?
A.The bell end is pushed into the previously laid spigot
B.The spigot (plain end) is installed into the previously laid bell
C.Either end may be used interchangeably with no extra bell-hole work
D.The flanged end is bolted to the previously laid mechanical joint
Explanation: DIPRA says pipe is normally laid by installing the spigot into the previously laid bell. Laying backward (bell onto a laid spigot) needs a larger bell hole and more care to support the new bell during backfill, so it is not the preferred method.
9Before a length of ductile-iron pipe is lowered into the trench, what inspection does DIPRA require?
A.Only a hydrostatic shop-test stamp check on the bell face
B.Only a coating-thickness reading at mid-barrel
C.Inspection for damage plus a check of the interior for dirt and foreign objects
D.A magnetic-particle test of every joint after the gasket is seated
Explanation: Each length is inspected for shipping or handling damage and the interior is checked for loose dirt, tools, clothing, or other objects before it is lowered. Contaminated or damaged pipe should not go into the trench.
10Why must sand, dirt, ice, and excess coating be removed from the bell gasket recess and the plain end before jointing?
A.To reduce the pipe's outside diameter so it fits a smaller casing
B.To prevent gasket displacement and leaking joints
C.To allow the cement-mortar lining to bond to the adjoining length
D.To meet the 1-mil asphaltic-coating thickness in ANSI/AWWA C151
Explanation: Foreign material in the gasket recess or on the plain end can roll or pinch the gasket so the joint leaks. DIPRA requires those surfaces to be cleaned before assembly of both push-on and mechanical joints.

About the NV A-19A Water Pipelines Exam

The Nevada A-19A Pipelines and Conduits for Water 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 closed book. 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

Closed Book computer-based multiple-choice. See the current PSI Nevada contractor bulletin for allowed and closed-book references.

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-19A Water Pipelines Exam Content Outline

52%

Water Piping

Water pipeline installation (21 items)

15%

Safety

Trenching and pipeline safety (6 items)

10%

Paving

Restoration paving (4 items)

15%

Excavation, Compaction and Grading

Trenching and backfill (6 items)

8%

Nevada One-Call

Nevada One-Call / 811 (3 items)

How to Pass the NV A-19A Water Pipelines Exam

What You Need to Know

  • Passing score: 70% (28 of 40 points)
  • Assessment: Closed Book computer-based multiple-choice. See the current PSI Nevada contractor bulletin for allowed and closed-book references.
  • 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-19A Water Pipelines 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-19A Pipelines and Conduits for Water 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-19A Water Pipelines 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-19A Water Pipelines exam open book?

No. PSI lists this examination as closed book. Study the bulletin reference list before the appointment; those books are not allowed in the 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.