PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free MS Process Piping Practice Questions

Prepare for the Mississippi Process Piping Contractor Examination exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More Mississippi Contractor Licensing Examinations

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Mississippi Alarm Systems and Equipment Examination

Practice Questions

Mississippi Boiler Installation and Repair Examination

Practice Questions

Mississippi Building Construction Examination

Practice Questions

Mississippi Carpentry Examination

Practice Questions

Mississippi Communication Systems Examination

Practice Questions

Mississippi Concrete Examination

Practice Questions
2026 Statistics

Key Facts: MS Process Piping Exam

70%

Passing Score

PSI MS Contractor Bulletin 4/23/2026

50 Q

Official Exam Questions

PSI MS Contractor Bulletin 4/23/2026

2 hours

Time Allowed

PSI MS Contractor Bulletin 4/23/2026

$120

PSI Exam Fee

PSI MS Contractor Bulletin 4/23/2026

Open book

Exam Format

PSI MS Contractor Bulletin 4/23/2026

MS Process Piping PSI trade exam: 50 questions, 70% pass, 2 hours, fee $120. Open-book MSBOC classification (bulletin 4/23/2026).

Sample MS Process Piping Practice Questions

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

1In pipe welding qualification, what describes the 6G position?
A.The pipe is rotated on a horizontal axis while the welder stays in the flat position
B.The pipe is fixed vertically and the weld is made in the horizontal position
C.The pipe is fixed with its axis at 45 degrees and is not rotated during welding
D.The pipe is fixed horizontally and the welder works only from the top
Explanation: In the 6G position the pipe axis is set at about 45 degrees and the joint is not rotated. The welder must complete the weld through flat, vertical, horizontal, and overhead portions of the same joint. A 6G qualification is therefore the most demanding common pipe test and is widely used to show all-position capability.
2What describes a 5G pipe weld?
A.The pipe is fixed horizontally and is not rotated, so the weld progresses through overhead, vertical, and flat positions
B.The pipe is rolled continuously so every pass stays in the flat position
C.The pipe stands vertically and the weld is a single horizontal bead
D.The pipe is inclined at 45 degrees and rolled toward the welder
Explanation: In 5G the pipe axis is horizontal and the joint is fixed. The welder must travel around the pipe, which means the same groove includes overhead, vertical, and flat work. Field process lines are often welded in 5G because the pipe cannot be rolled in place.
3Which setup is the 2G pipe welding position?
A.Pipe axis horizontal, pipe rolled, weld kept flat
B.Pipe axis horizontal and fixed, weld made all the way around
C.Pipe axis at 45 degrees and fixed
D.Pipe axis vertical and fixed, weld made horizontally around the pipe
Explanation: In 2G the pipe stands vertically and remains fixed. The groove is horizontal, so the welder travels around the circumference in the horizontal position. That setup tests horizontal groove technique without the overhead work required in 5G or 6G.
4Why is an E6010 electrode commonly chosen for the open-root pass on carbon-steel process pipe?
A.It is a low-hydrogen fill electrode that needs an oven and produces a heavy slag cover
B.It is a cellulose electrode with a forceful, digging arc that can keyhole and penetrate an open root
C.It is intended only for fillet welds on galvanized sheet
D.It must be used with AC and a short-circuit GMAW transfer
Explanation: E6010 is a cellulose-sodium electrode used with DCEP. Its deep, digging arc and fast-freezing slag help a welder maintain a keyhole through an open root. After the root is in, many procedures switch to a low-hydrogen electrode such as E7018 for fill and cap.
5What storage practice is required for E7018 low-hydrogen electrodes after the hermetic container is opened?
A.Leave them on the bench overnight so they pick up moisture and run cooler
B.Store them in a heated holding oven so they stay dry until use
C.Soak them in water to prevent porosity
D.Refrigerate them below freezing to harden the flux
Explanation: E7018 coating is low-hydrogen only if it stays dry. After the sealed can is opened, electrodes are held in a heated rod oven and issued in small lots. Moisture in the coating becomes hydrogen in the weld, which can cause underbead or delayed cracking in carbon and low-alloy steel.
6When fitting a socket-weld joint for ASME B31 process piping, what gap is provided between the pipe end and the bottom of the socket before welding?
A.The pipe is bottomed hard against the socket shoulder with no gap
B.An approximate 1/16 inch (1.5 mm) gap is left before welding
C.A 3/8 inch gap is required so the fillet can shrink freely
D.A 1/2 inch gap is required on all NPS 2 and larger sockets
Explanation: B31.3 requires an approximate 1/16 inch (1.5 mm) gap at the bottom of the socket before welding. The gap lets the pipe expand as the fillet shrinks so the weld is less likely to crack. The dimension is a before-weld fit-up requirement; the code does not require the same gap to be verified after welding.
7Why is an inert-gas back purge used when GTAW welding the root of stainless-steel process pipe?
A.To quench the root so the weld metal becomes fully martensitic
B.To force the keyhole open with compressed air from inside the pipe
C.To replace the shielding gas so no torch gas is needed
D.To keep air off the inside of the root so the metal does not oxidize or sugar
Explanation: Stainless root beads oxidize badly if the inside surface is left in air. A back purge of argon, or another specified inert gas, displaces oxygen until the root and first passes are complete. Without a purge the root becomes dark, sugared, and rough, which hurts corrosion resistance and can hide incomplete fusion.
8On a typical single-V butt weld in carbon-steel pipe, which three fit-up dimensions must match the WPS before the root pass?
A.Bolt-circle diameter, gasket ID, and flange face finish
B.Bevel angle, root face (land), and root opening (gap)
C.Thread pitch, engagement length, and dope thickness
D.Insulation density, jacket gauge, and vapor-barrier lap
Explanation: Open-root pipe fit-up is controlled by the bevel angle, the land (root face), and the root opening. Those three dimensions set the keyhole size and the amount of filler needed to fuse the inside. A WPS gives the allowed ranges; measuring them before tacking is the first quality check on a butt joint.
9Internal high-low (radial misalignment) at a pipe butt joint is primarily a concern because it can:
A.Increase the pipe outside diameter enough to change the nominal pipe size
B.Create a stress riser and make complete root fusion more difficult
C.Convert a groove weld into a socket weld
D.Eliminate the need for a root opening
Explanation: High-low is a radial offset between the two inside surfaces. The step concentrates stress and can shadow part of the land so the root does not fuse on the high side. Fit-up clamps, line-up vises, and grinding are used to keep high-low within the WPS and specification limits before the root is started.
10E6010 and E7018 pipe electrodes are typically welded with which current and polarity?
A.DC electrode positive (DCEP / reverse polarity)
B.DC electrode negative only, never reversed
C.Straight AC with no electrode lead
D.Pulsed nitrogen from the torch only
Explanation: Both common pipe electrodes, E6010 and E7018, are designed for DCEP (reverse polarity). DCEP puts more heat at the electrode and gives the penetration and arc force those coatings need. Using the wrong polarity produces a weak arc, poor fusion, and an unusable bead.

About the MS Process Piping Exam

Mississippi Process Piping Contractor Examination is a classification trade examination administered by PSI for the Mississippi State Board of Contractors. The official open-book exam has 50 questions, a 70% passing standard, and 2 hours allowed. PSI examination fee is $120 per portion (bulletin updated 4/23/2026). This English-language MCQ bank is a study aid for the official content outline; it is not an official PSI form, does not replace the required Law and Business Management exam, and is not a substitute for MSBOC application review or the official open-book examination.

Questions

50 scored questions

Time Limit

2 hours

Passing Score

70%

Exam Fee

$120 (PSI Services LLC (for Mississippi State Board of Contractors))

MS Process Piping Exam Content Outline

20%

Joining Methods

Welding and mechanical joining

14%

Pipe Fitting

Pipe fitting practices

14%

Safety

Process piping safety

4%

Reading Drawings

Piping drawings

10%

Codes

ASME B31 process piping codes

16%

Materials and Components

Pipe materials and components

8%

Process Equipment

Process equipment

4%

Insulation

Pipe insulation

6%

Pipe Supports

Pipe supports

4%

Line Labeling

Line identification

How to Pass the MS Process Piping Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 50 questions
  • Time limit: 2 hours
  • Exam fee: $120

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

MS Process Piping Study Tips from Top Performers

1Study only the approved references listed for this classification in the current PSI Mississippi Contractor bulletin (updated 4/23/2026)
2Practice open-book navigation with permanent tabs and indexes before test day
3Drill OSHA 29 CFR 1926 topics that appear across nearly every trade outline
4Confirm MSBOC classification scope and eligibility at msboc.us before scheduling with PSI
5All applicants must also pass Law and Business Management unless it is waived

Frequently Asked Questions

How many questions are on the MS Process Piping exam?

The official PSI examination has 50 scored questions (plus possible unscored experimental items). Passing is 70% within 2 hours.

How much does the MS Process Piping exam cost?

PSI lists $120 per examination portion (Candidate Information Bulletin updated 4/23/2026). MSBOC application fees are separate: $400 commercial or $50 residential. Additional classifications are $100 each.

Is the Mississippi contractor exam open book?

Yes. PSI administers MSBOC classification exams as open book. Only bulletin-listed approved references are allowed; temporary tabs such as Post-it notes are prohibited.

Do I still need the Law and Business Management exam?

Yes. MSBOC requires the Mississippi Law and Business Management exam (50 questions, 70%, 2 hours) of all applicants. Reciprocity may waive a trade exam in some cases but does not waive Law and Business.