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100+ Free MS Irrigation Practice Questions

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2026 Statistics

Key Facts: MS Irrigation Exam

70%

Passing Score

PSI MS Contractor Bulletin 4/23/2026

40 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 Irrigation PSI trade exam: 40 questions, 70% pass, 2 hours, fee $120. Open-book MSBOC classification (bulletin 4/23/2026).

Sample MS Irrigation Practice Questions

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

1On an irrigation plan, what does the abbreviation GPM represent?
A.Gallons per minute of flow
B.Grains per minute of hardness
C.Gauge pressure in millibars
D.Ground pressure modulus
Explanation: GPM is gallons per minute, the U.S. customary volumetric flow unit used for sprinklers, valves, meters, and pipe sizing. Zone demand is the sum of the GPM of every head that runs on that station. Pump and mainline capacity are also stated in GPM.
2When is static water pressure measured on an irrigation supply?
A.While the largest zone is running at design flow
B.After the pump is shut off and the piping is drained
C.Only at the farthest sprinkler during operation
D.With the system pressurized and no water flowing
Explanation: Static pressure is the pressure in a full, pressurized system when every valve is closed and flow is zero. With no flow there is no friction loss, so the gauge reads the highest pressure the source can deliver at that elevation. Dynamic or working pressure is the lower value measured while water is moving.
3How many feet of water head equal 1 psi?
A.0.433 ft
B.1.00 ft
C.2.31 ft
D.14.7 ft
Explanation: One pound per square inch equals 2.31 feet of water head. Designers convert pump and elevation problems with psi = feet ÷ 2.31, or feet = psi × 2.31. The inverse factor, 0.433 psi per foot, is the same relationship written the other way.
4A sprinkler zone climbs 20 ft from the point of connection to the highest head. About how much pressure is lost to elevation alone?
A.8.7 psi
B.4.3 psi
C.20 psi
D.46 psi
Explanation: Elevation change in psi is feet divided by 2.31, or feet times 0.433. Twenty feet ÷ 2.31 equals 8.66 psi, about 8.7 psi lost going uphill. That loss is added to friction when you check residual pressure at the last head. Going downhill would add the same 8.7 psi.
5Using V = 0.4085 × Q ÷ d², what is the velocity in 1 in Schedule 40 PVC (inside diameter 1.049 in) carrying 13 GPM?
A.2.4 ft/s
B.3.6 ft/s
C.4.8 ft/s
D.7.2 ft/s
Explanation: d² = 1.049 × 1.049 = 1.100. Velocity = 0.4085 × 13 ÷ 1.100 = 4.83 ft/s, about 4.8 ft/s. That is just under the common 5 ft/s irrigation limit used to control friction, noise, and water hammer. A 1 in Schedule 40 main is therefore acceptable at 13 GPM by the velocity rule.
6Why do irrigation designers commonly limit PVC mainline velocity to about 5 ft/s?
A.To keep the pipe full so air cannot enter the system
B.Because PVC cannot carry water faster than 5 ft/s under any pressure
C.To satisfy a minimum-velocity scouring requirement
D.To reduce friction loss, surge pressure, water hammer, and long-term wear
Explanation: Friction loss rises roughly with flow to the 1.85 power, so high velocity wastes pressure. Sudden valve closure at high velocity also creates water-hammer surge that can split fittings. Staying near or below 5 ft/s is the standard landscape-irrigation velocity guideline for PVC mains. It is a design limit, not a physical maximum of the material.
7What Hazen–Williams C-factor is normally used for new smooth PVC irrigation pipe?
A.80
B.100
C.130
D.150
Explanation: Smooth plastic pipe is assigned C = 150 in standard irrigation friction tables, including those used with Simplified Irrigation Design. A higher C means less roughness and less head loss for the same flow and diameter. Steel, older iron, and rough pipe use much lower C values and therefore show more friction.
8A Class 200 PVC main has a table friction loss of 3.2 psi per 100 ft at the design GPM. What is the friction loss in 250 ft of that main?
A.3.2 psi
B.6.4 psi
C.8.0 psi
D.11.2 psi
Explanation: Friction loss scales with length: 3.2 psi/100 ft × 2.50 = 8.0 psi. That 8.0 psi is subtracted from available working pressure when you check the last head. Always convert the run to hundreds of feet before multiplying by the table value.
9A zone demands 18 GPM. Using a 5 ft/s limit, 1 in Schedule 40 PVC (ID 1.049 in) is limited to about 13 GPM and 1-1/4 in Schedule 40 (ID 1.380 in) is limited to about 23 GPM. What is the smallest listed size that is acceptable?
A.3/4 in Schedule 40
B.1 in Schedule 40
C.1-1/4 in Schedule 40
D.2 in Schedule 40
Explanation: Eighteen GPM exceeds the 13 GPM capacity of 1 in Schedule 40 at 5 ft/s, so that size is too small. 1-1/4 in Schedule 40 can carry about 23 GPM at the same limit, so it is the smallest listed size that stays under 5 ft/s. Designers size each reach for the flow that actually passes that reach, not for the nominal pipe name.
10Compared with Class 200 PVC of the same nominal size, Schedule 40 PVC has which property?
A.A thicker wall and a higher pressure rating
B.A thinner wall and a lower pressure rating
C.The same wall thickness and the same inside diameter
D.A larger inside diameter and more flow capacity
Explanation: Schedule 40 has a thicker wall than Class 200 (SDR 21) in the common irrigation sizes, so its pressure rating is higher and its inside diameter is smaller. Class 200 is often used on laterals where pressure is moderate and extra flow capacity helps. Mains that see full static pressure are frequently specified as Schedule 40.

About the MS Irrigation Exam

Mississippi Irrigation Systems Contractor Examination is a classification trade examination administered by PSI for the Mississippi State Board of Contractors. The official open-book exam has 40 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

40 scored questions

Time Limit

2 hours

Passing Score

70%

Exam Fee

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

MS Irrigation Exam Content Outline

35%

Piping and Valves

Irrigation piping and valves

25%

Layout, Plans and Specifications

Irrigation layout and plans

15%

Sprinkler Heads

Sprinkler heads and coverage

15%

Controls and wiring

Controllers and irrigation wiring

5%

Excavation, Compaction and Grading

Trenching and backfill

5%

Pumps

Irrigation pumps

How to Pass the MS Irrigation Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 40 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 Irrigation 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 Irrigation exam?

The official PSI examination has 40 scored questions (plus possible unscored experimental items). Passing is 70% within 2 hours.

How much does the MS Irrigation 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.