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100+ Free NM CID MS-6 Practice Questions

Prepare for the New Mexico CID MS-6 Lawn Sprinklers Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: NM CID MS-6 Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

50 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

120 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 68.88

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID MS-6 is a 50-question PSI lawn sprinklers exam, 75% pass, 120 minutes, USD 68.88 (bulletin 4/3/2026).

Sample NM CID MS-6 Practice Questions

Try these sample questions to test your NM CID MS-6 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 flow specification, what does GPM measure?
A.Gallons per minute
B.Gauge pressure in millibars
C.Ground-pressure modulus
D.Grains of hardness per minute
Explanation: GPM is gallons per minute, the U.S. customary volumetric flow unit used for sprinkler nozzles, zone totals, meters, and pumps. Precipitation-rate, pipe-velocity, and valve-loss calculations all start from GPM.
2Static water pressure on a potable lawn-sprinkler service is the pressure measured when:
A.The system is pressurized and no water is flowing
B.Only the farthest head is operating
C.The service is drained and open to atmosphere
D.Every zone is running at design flow
Explanation: Static pressure is read on a pressurized system with all valves closed, so there is no friction or velocity loss. It is the starting number for a pressure budget before elevation, pipe, valve, and backflow losses are subtracted.
3How much pressure does each foot of vertical water column add or subtract in an irrigation system?
A.1.0 psi per foot
B.2.31 psi per foot
C.0.433 psi per foot
D.0.043 psi per foot
Explanation: A one-foot column of water exerts about 0.433 psi. The inverse is 2.31 ft of head per 1 psi. Elevation changes between the meter, backflow, and heads are converted with this pair of factors.
4A backflow assembly sits 10 ft above the water meter. How much static pressure is lost to elevation between the meter and the assembly?
A.0.43 psi
B.2.31 psi
C.4.33 psi
D.10 psi
Explanation: Elevation loss is 10 × 0.433 = 4.33 psi. Equivalently, 10 ÷ 2.31 ≈ 4.33 psi. That loss is present even with no flow and must be subtracted before pipe and valve losses are considered.
5Dynamic (working) pressure is the pressure measured when:
A.Water is flowing at the rate being designed or tested
B.The compressor is blowing the system out for winter
C.The meter is removed and the curb stop is closed
D.All valves are closed and the line is locked up
Explanation: Dynamic or residual pressure is the flowing pressure after friction, elevation, meter, backflow, and valve losses. Sprinkler nozzles are selected and spaced from this working pressure, not from the higher static reading.
6A lateral climbs 12 ft from the zone valve to the highest head. What happens to pressure at that head from elevation alone?
A.It decreases about 5.2 psi
B.It is unchanged because laterals are small
C.It decreases 12 psi
D.It increases about 5.2 psi
Explanation: Water flowing uphill loses 0.433 psi per foot of rise, so 12 × 0.433 ≈ 5.2 psi. That elevation tax is added to friction when checking whether the last head still has its required nozzle pressure.
7Water hammer on an irrigation mainline is most often produced by:
A.Sudden stop of fast-moving water at a quick-closing valve
B.A pressure-reducing valve set too low
C.An air-relief valve at a high point
D.Slow manual opening of a ball valve
Explanation: Surge occurs when flowing water is stopped almost instantly and momentum converts to a pressure spike. Slow-closing valves, reasonable velocities, and air management keep those spikes from breaking pipe and fittings.
8Irrigation designers use the Hazen-Williams equation primarily to estimate:
A.Sprinkler precipitation rate
B.Soil infiltration rate
C.Friction loss in pressurized pipe
D.Reference evapotranspiration
Explanation: Hazen-Williams estimates head or pressure loss from flow, inside diameter, length, and a roughness coefficient C. Landscape pipe-sizing charts in design manuals are built from that relationship.
9What Hazen-Williams C-factor is customarily used for new smooth PVC irrigation pipe?
A.100
B.120
C.150
D.180
Explanation: New PVC is taken as C = 150 because the interior is very smooth. Steel is commonly 100–120, and aged rough pipe is lower still. Using too small a C overstates friction and oversizes pipe.
10If pipe diameter and flow stay the same and the run is doubled, friction loss approximately:
A.Doubles
B.Quadruples
C.Drops by half
D.Stays the same
Explanation: Hazen-Williams loss is directly proportional to length. Twice the pipe gives twice the psi loss at the same Q and diameter. Flow and diameter change loss much more steeply than length does.

About the NM CID MS-6 Exam

The New Mexico CID MS-6 examination covers lawn sprinkler systems. The official open-book PSI exam has 50 scored questions, a 75% passing standard (38 points), and 120 minutes allowed. The allowed reference is Simplified Irrigation Design by Pete Melby (2nd edition, 1995). NMAC 14.6.6 MS-6 requires two years of experience and covers potable-water sprinkler systems, excavation, backflow prevention devices, and incidental plug-in electrical control panels and control wiring not to exceed 24 volts. This is a different classification from GS-29 landscaping. PSI lists the fee at USD 68.88 (bulletin updated 4/3/2026). This English-language MCQ bank is a study aid, not an official PSI form.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

75% (38 of 50 points)

Exam Fee

USD 68.88 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID MS-6 Exam Content Outline

20%

General Knowledge

General knowledge (10 items)

18%

Design

Design (9 items)

10%

Materials

Materials (5 items)

18%

Controls and Wiring

Controls and wiring (9 items)

8%

Excavation

Excavation (4 items)

6%

Pumps

Pumps (3 items)

10%

Water Supply

Water supply (5 items)

10%

Sprinkler Heads

Sprinkler heads (5 items)

How to Pass the NM CID MS-6 Exam

What You Need to Know

  • Passing score: 75% (38 of 50 points)
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam fee: USD 68.88

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

NM CID MS-6 Study Tips from Top Performers

1General knowledge, design, and controls are 28 of 50 official items. Study Melby Simplified Irrigation Design (2nd, 1995).
2This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the NM MS-6 exam?

The official PSI examination has 50 scored questions. Passing is 75% (38 points) within 120 minutes (bulletin updated 4/3/2026).