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100+ Free NV C-21G Industrial Piping Practice Questions

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2026 Statistics

Key Facts: NV C-21G Industrial Piping Exam

50 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

37 of 50 points

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2 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 C-21G Industrial Piping Contractor Examination is the official NSCB/PSI open book exam: 50 questions, 37 of 50 points, 2 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-21G Industrial Piping Practice Questions

Try these sample questions to test your NV C-21G Industrial Piping exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Threaded steel joints on C-21G industrial water, steam, and fuel-gas piping under the 2018 UPC/UMC shall be made with:
A.Straight (running) machine threads with no taper
B.Standard taper pipe threads (NPT) and an approved thread compound or tape on the male threads
C.Hose-barb threads sealed with electrical tape
D.Metric parallel threads pulled up dry
Explanation: UPC Chapters 6 and 12 and UMC Chapter 13 require ASME B1.20.1 taper pipe threads on steel pipe. The taper makes the joint; approved compound or tape on the male threads fills the spiral leak path. Straight machine threads, hose-barb threads, and dry metric parallels are not the UPC/UMC industrial joint.
2A C-21G crew finds a pair of 4-inch raised-face flanges 3/8 inch out of parallel. The correct way to close the joint is to:
A.Snug the bolts in a star pattern until the flanges spring together
B.Correct the pipe fit-up (cut, reweld, or add a spool) so the flanges meet square, then tighten the bolts evenly
C.Install a double-thick gasket and torque only two opposite bolts
D.Heat one flange cherry-red and quench it to shrink the gap
Explanation: Flange bolts are clamps, not come-alongs. Springing misaligned industrial pipe with the bolts overstresses the gasket, the flange neck, and the nearest weld. Cut and refit until the faces are parallel and the bolt holes line up freely, then load the gasket in a star pattern.
3A roll-grooved or cut-grooved mechanical coupling on C-21G industrial water or process pipe is acceptable only when:
A.Any farm-irrigation clamp is painted to match the pipe
B.The groove dimensions, coupling, and gasket are listed for that pipe, pressure, temperature, and fluid
C.The groove is cut by eye and sealed with pipe dope
D.The coupling is used to pull a 3-inch offset into line
Explanation: UPC/UMC mechanical joints must be listed assemblies. Groove width, depth, and location are manufacturer-specified; the gasket compound must match the fluid and temperature. A field-hacked groove or an irrigation clamp is not a listed industrial joint, and a coupling is not an alignment jack.
4A 45-degree offset on a C-21G industrial chilled-water line must rise 18 inches center-to-center. The travel (center-to-center length of the offset piece) is closest to:
A.18 inches
B.22 inches
C.25-1/2 inches
D.36 inches
Explanation: Travel of a 45-degree offset equals the offset times 1.414 (√2). 18 × 1.414 = 25.45 inches, so 25-1/2 inches is the takeoff. Using 18 inches under-cuts the spool; 36 inches is a 90-degree run equal to twice the offset.
5A 4-inch Schedule 40 C-21G process-water spool uses two long-radius 90-degree elbows. The required center-to-center distance between elbow centers is 60 inches. Using a long-radius takeout of 6 inches per 4-inch 90 (1.5 × NPS), the cut length of the straight pipe between the two welds is:
A.48 inches
B.54 inches
C.60 inches
D.72 inches
Explanation: Each 4-inch long-radius 90 has a 6-inch center-to-end. Subtract both takeouts from the 60-inch center-to-center: 60 − 6 − 6 = 48 inches. That is the pipe cut between bevels. Leaving the piece at 60 inches makes the finished centers 72 inches and misses the nozzles.
6Two 2-inch long-radius 45-degree elbows make a C-21G offset whose travel is 24 inches center-to-center. Using a 45-degree takeout of 1-1/4 inches (5/8 × NPS), the cut length of the offset nipple between weld bevels is:
A.21-1/2 inches
B.22-3/4 inches
C.24 inches
D.26-1/2 inches
Explanation: Each 2-inch 45 has a 1.25-inch center-to-end. 24 − 1.25 − 1.25 = 21.5 inches. The 24-inch figure is travel, not cut length. Adding the takeouts makes a piece that will not drop between the fittings.
7A grooved coupling on a C-21G food-process water line will see hot caustic CIP at about 180°F. The gasket shall be:
A.Any black EPDM leftover from a chilled-water job, because all rubber is the same
B.The coupling manufacturer's compound listed for the fluid, temperature, and sanitary service
C.Natural gum rubber, because it is food-safe at any temperature
D.Omitted; metal-to-metal grooved joints do not use gaskets
Explanation: Grooved-joint gaskets are fluid- and temperature-specific. A chilled-water EPDM can harden or swell in hot caustic; an unlisted gum-rubber ring is not a sanitary listing. The coupling always uses a gasket — there is no metal-to-metal grooved pressure joint.
8A 3-inch C-21G industrial water header needs a 1-inch branch. The preferred fitting, rather than a bushing screwed into a 3-inch tee, is:
A.A reducing tee or a listed branch outlet (weld-o-let / thread-o-let) sized for the header and branch
B.A street elbow jammed into a coupling
C.A hole burned in the header and a 1-inch nipple tacked over it
D.Two bushings stacked inside a 3-by-3 tee
Explanation: UPC/UMC fitting practice and industrial fabrication use a reducing tee or a listed branch connection so the branch is fully engaged and the header wall is reinforced. Bushings, stacked bushings, and burned-in nipples leave poor engagement, a leak path, and an unreinforced hole.
9A C-21G rolling offset must clear a duct: 12 inches of rise and 9 inches of roll, made with two 45-degree elbows. The travel of the offset piece is closest to:
A.12 inches
B.15 inches
C.21 inches
D.27 inches
Explanation: True offset = √(rise² + roll²) = √(144 + 81) = √225 = 15 inches. Travel of a 45-degree offset is true offset × 1.414 = 15 × 1.414 = 21.21 inches, about 21 inches. Using only the 12-inch rise, or using 15 inches as the travel, under-cuts the piece.
10A 5-inch long-radius 90 has a 7-1/2 inch takeout (1.5 × NPS). Two of those 90s are to be welded to a C-21G steam jumper whose finished center-to-center is 80 inches. The cut length of the jumper pipe is:
A.65 inches
B.72-1/2 inches
C.80 inches
D.95 inches
Explanation: 80 − 7.5 − 7.5 = 65 inches. That is the bevel-to-bevel cut. A 72-1/2 inch cut subtracts only one takeout; 80 inches ignores takeout; 95 inches adds both takeouts and will not fit the nozzles.

About the NV C-21G Industrial Piping Exam

The Nevada C-21G Industrial Piping Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 50 scored questions. Passing is 37 of 50 points in 2 hours. The examination is open book. Uniform Plumbing Code, 2018 and 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 270, 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 Plumbing Code, 2018 and Uniform Mechanical Code, 2018 (allowed in center)

Time Limit

2 hours

Passing Score

37 of 50 points

Exam Fee

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

NV C-21G Industrial Piping Exam Content Outline

10%

Pipe Fitting

Pipe Fitting (5 items)

14%

Piping Materials

Piping Materials (7 items)

12%

Process Piping

Process Piping (6 items)

12%

Gas Piping

Gas Piping (6 items)

10%

Water and Steam Piping

Water and Steam Piping (5 items)

10%

Refrigerant Piping

Refrigerant Piping (5 items)

12%

Hangers and Supports

Hangers and Supports (6 items)

6%

Estimating and Plan Reading

Estimating and Plan Reading (3 items)

6%

Welding

Welding (3 items)

8%

Safety

Safety (4 items)

How to Pass the NV C-21G Industrial Piping Exam

What You Need to Know

  • Passing score: 37 of 50 points
  • Assessment: Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 and Uniform Mechanical Code, 2018 (allowed in center)
  • Time limit: 2 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 C-21G Industrial Piping Study Tips from Top Performers

1Distribute study time to the official bulletin 270 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 C-21G Industrial Piping Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 37 of 50 points within 2 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-21G 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 C-21G exam open book?

Yes. PSI lists this examination as open book. Uniform Plumbing Code, 2018 and 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.