Mississippi Plumbing Examination

Per IPC 2021 Section 301.7, if a manufacturer's installation instructions conflict with a requirement of the code, which provision applies?

• AThe manufacturer's instructions always control
• BThe less restrictive provision applies
• CThe more restrictive provision applies
• DThe contractor may choose either provision

Per IPC 2021 Section 301.6, plumbing systems are prohibited in an elevator shaft or elevator equipment room except that floor drains, sumps, and sump pumps at the base of the shaft are permitted when they are which of the following?

• ADirectly connected to the sanitary stack with a sanitary tee
• BIndirectly connected to the plumbing system and comply with the oil-separator rules of Se…
• CConnected to a grease interceptor serving the building kitchen
• DOmitted if the elevator pit is waterproofed

Per IPC 2021 Section 303.3, plastic pipe, fittings, and components used in a plumbing system shall be third-party certified as conforming to which standard?

• ANSF 14
• BNSF 61 only, with no plastic-pipe listing
• CASTM A74
• DCISPI 301

A drainage and vent system is water-tested in sections per IPC 2021 Section 312.2. What is the minimum test head and minimum hold time for each section?

• A5-foot head of water held for 10 minutes
• B10-foot head of water held for not less than 15 minutes
• C15-foot head of water held for 5 minutes
• DA 5 psi air test held for 30 minutes

Per IPC 2021 Section 312.3, which statement about drainage and vent air testing is correct?

• APlastic piping shall not be tested using air
• BPlastic piping may be air-tested at 5 psi for 15 minutes
• CAn air test of 50 psi is required on all DWV systems
• DAir testing is never permitted on any drainage piping

A plumber is selecting a test gauge for a 5 psi drainage air test. Per IPC 2021 Section 312.1.1, what is the maximum permitted gauge increment?

• A0.10 psi
• B1 psi
• C2 psi
• D5 psi

On a construction walking/working surface with an unprotected side or edge, OSHA 29 CFR 1926.501 generally requires fall protection when the employee is how far above a lower level?

• A4 feet
• B6 feet
• C10 feet
• D15 feet

When a portable ladder is used to reach an upper landing, OSHA 29 CFR 1926.1053 requires the side rails to extend how far above that landing unless the ladder is secured and a grasping device is provided?

• A1 foot
• B2 feet
• C3 feet
• D6 feet

Unless the excavation is entirely in stable rock or a registered professional engineer designs a different system, OSHA 29 CFR 1926.652 requires a protective system for employees in a trench that is how deep or deeper?

• A4 feet
• B5 feet
• C6 feet
• D8 feet

A plumber is working in a trench that is 6 feet deep and 70 feet long. Per OSHA 29 CFR 1926.651(c)(2), what is the maximum lateral travel distance to a ladder, stairway, or ramp used as a means of egress?

• A15 feet
• B25 feet
• C50 feet
• D75 feet

An extension ladder has a working length of 20 feet from the ground to the top support. Using the OSHA 1926.1053 approximately 4-to-1 setup angle, how far from the wall should the base of the ladder be placed?

• A3 feet
• B4 feet
• C5 feet
• D8 feet

A 90-foot-long water-service trench is 6 feet deep. Spoil will be piled beside the trench, and employees will work in the excavation. Which combination satisfies OSHA 1926 Subpart P?

• ANo protective system is required because the trench is only 6 feet deep; spoil may be pil…
• BA protective system is required at 5 feet or deeper, spoil and other materials must be ke…
• COnly a hard hat is required if a spotter is present
• DA protective system is required only if the trench exceeds 8 feet

Per IPC 2021 Section 708.1.1, horizontal drainage pipes in buildings shall have cleanouts located at intervals of not more than how many feet, measured along developed length?

• A50 feet
• B75 feet
• C100 feet
• D200 feet

Per IPC 2021 Section 708.1.4, a cleanout is required where a horizontal drainage pipe, building drain, or building sewer has a change of horizontal direction greater than how many degrees?

• A22.5 degrees
• B45 degrees
• C90 degrees
• D135 degrees

Per IPC 2021 Section 708.1.3, the junction of the building drain and the building sewer shall be served by a cleanout located at the junction or within how many feet of developed length upstream of the junction?

• A5 feet
• B10 feet
• C18 feet
• D25 feet

Per IPC 2021 Section 708.1.5, a cleanout serving 6-inch drainage piping generally must be which size?

• A2 inches, because all cleanouts are 2 inches
• B4 inches, because cleanouts for piping larger than 4 inches need not be larger than 4 inc…
• C6 inches, because a cleanout must always match the served pipe exactly
• D8 inches, to allow extra cable clearance

Per IPC 2021 Section 708.1.10, what is the minimum clearance, measured from and perpendicular to the face of the opening, required in front of a cleanout on 4-inch piping?

• A12 inches
• B18 inches
• C24 inches
• D36 inches

A 4-inch building drain makes three horizontal 90-degree turns. The developed length from the first turn to the third turn is 28 feet. Per IPC 2021 Section 708.1.4, how many change-of-direction cleanouts are required for those three turns?

• ANone, because 90-degree turns do not require cleanouts
• BOne; the cleanout at the first change of direction serves all changes within 40 feet of d…
• CThree; every change greater than 45 degrees must have its own cleanout
• DTwo; only the first and last turns need cleanouts

Per IPC 2021 Section 405.3.1, a water closet shall not be set closer than how many inches from its centerline to any side wall, partition, vanity, or other obstruction?

• A12 inches
• B15 inches
• C18 inches
• D21 inches

Per IPC 2021 Section 421.4, a shower compartment shall have not less than 900 square inches of interior cross-sectional area and a minimum interior dimension of how many inches?

• A24 inches
• B30 inches
• C32 inches
• D36 inches

Per IPC 2021 Table 604.4, what is the maximum water consumption of a water closet, except for listed blowout and clinical-sink exceptions?

• A1.0 gallon per flushing cycle
• B1.28 gallons per flushing cycle
• C1.6 gallons per flushing cycle
• D3.5 gallons per flushing cycle

Per IPC 2021 Section 604.5, a fixture supply pipe shall terminate not more than how far from the point of connection to the fixture?

• A12 inches
• B18 inches
• C24 inches
• D30 inches

A tiled shower receptor with a liner required by IPC 421.5.2 is being tested. Per IPC 2021 Section 312.9, the receptor shall be filled with potable water to a depth of not less than how many inches at the threshold, and the water shall be held for not less than how long?

• A1 inch for 5 minutes
• B2 inches for not less than 15 minutes
• C4 inches for 30 minutes
• D6 inches for 1 hour

Two floor-mounted tank-type water closets are installed along the same wall with no partition between them. Per IPC 2021 Section 405.3.1, what is the minimum center-to-center spacing, and what is the minimum clear space in front of each water closet?

• A15 inches center to center and 15 inches in front
• B21 inches center to center and 30 inches in front
• C30 inches center to center and 21 inches in front
• D36 inches center to center and 24 inches in front

A private bathroom group served by a 1.6 gpf tank water closet, a lavatory, and a bathtub is being counted for drainage load. Per IPC 2021 Table 709.1, what DFU value is assigned to that bathroom group, and what DFU total results if a residential clothes washer on a 2-inch standpipe is added on the same private branch?

• ABathroom group 6 DFU; total 8 DFU
• BBathroom group 5 DFU; total 7 DFU
• CBathroom group 3 DFU; total 5 DFU
• DBathroom group 4 DFU; total 6 DFU

Per IPC 2021 Section 504.4.1, which statement about a water-heater temperature-and-pressure relief valve is correct?

• AA shutoff valve may be installed between the relief valve and the tank for service
• BThere shall not be a check valve or shutoff valve between a relief valve and the heater o…
• CThe relief valve may be used as the thermal-expansion control device
• DThe temperature element may be located anywhere on the cold-water inlet

Per IPC 2021 Section 504.6, the discharge pipe from a water-heater temperature-and-pressure relief valve shall meet which of the following requirements?

• AIt shall be directly connected to the sanitary drainage system and may be trapped
• BIt shall discharge through an air gap in the same room, shall not be trapped, shall have…
• CIt may be reduced one pipe size and may serve two heaters
• DIt shall terminate with a threaded cap so the discharge can be directed into a hose

A closed 40-gallon storage water heater is supplied through a pressure-reducing valve. Using a volumetric expansion of 1.7 percent for water heated from 40°F to 140°F, how much extra volume must be absorbed, and what IPC 2021 provision requires a method of controlling that pressure rise?

• A0.17 gallons; Section 504.4 allows the T&P valve to dump the expansion
• B0.40 gallons; no expansion control is required when a PRV is present
• C0.68 gallons; Section 607.3 requires a method of controlling increased pressure caused by…
• D6.80 gallons; an open expansion tank equal to 17 percent of the heater volume is required

Per IPC 2021 Section 503.1, the cold-water branch to each storage water heater shall be provided with a valve that is located near the equipment and that does which of the following?

• AAlso shuts off cold water to the rest of the building
• BServes only that water heater or storage tank and does not disrupt cold water to the rema…
• CMust be a check valve to prevent reverse flow through the heater
• DMay be omitted if the heater has a drain valve

Per IPC 2021 Section 604.9, where quick-closing valves are used, a water-hammer arrestor shall be installed. Those arrestors shall conform to which standard?

• AASSE 1003
• BASSE 1010
• CASSE 1013
• DASSE 1024

Per IPC 2021 Section 705.16.2, joints between copper or copper-alloy pipe or tubing and galvanized steel pipe shall be made with which of the following?

• AA solvent-cemented PVC adapter
• BA copper-alloy fitting or dielectric fitting
• CA lead-caulked cast-iron ferrule only
• DA saddle-type fitting brazed to the steel

Per IPC 2021 Section 606.2, a shutoff valve is required on the fixture supply to each plumbing fixture except which of the following fixtures?

• ALavatories and kitchen sinks
• BWater closets and urinals
• CBathtubs and showers
• DHose bibbs and wall hydrants

Per IPC 2021 Section 604.8, an approved water pressure-reducing valve with strainer is required when water pressure within a building exceeds what static pressure?

• A60 psi
• B80 psi
• C100 psi
• D160 psi

Per IPC 2021 Section 603.1, the water service pipe shall be not less than what diameter?

• A1/2 inch
• B3/4 inch
• C1 inch
• D1-1/4 inches

In plumbing calculations, the static pressure exerted by a column of water is taken as approximately how many pounds per square inch per foot of elevation?

• A0.250 psi per foot
• B0.433 psi per foot
• C0.500 psi per foot
• D2.31 psi per foot

A hose bibb is 32 feet above the water meter. Ignoring friction, what is the static pressure drop due to elevation alone?

• A7.4 psi
• B10.4 psi
• C13.9 psi
• D32.0 psi

A water service and a building sewer of non-Table-702.2 material share a yard. Per IPC 2021 Section 603.2, which installation is acceptable without sleeving?

• AThe pipes in the same trench 12 inches apart at the same invert
• BA 5-foot horizontal separation of undisturbed or compacted earth, or the water service at…
• CThe water service 6 inches below the sewer invert
• DNo separation is required if both pipes are plastic

Per IPC 2021 Section 605.2.1, pipe, fittings, joints, valves, faucets, and fixture fittings that supply water for drinking or cooking shall comply with NSF 372 and shall have a weighted-average lead content of not more than what percent?

• A0.20 percent
• B0.25 percent
• C8 percent
• DLead-free is defined as zero lead

Per IPC 2021 Section 312.5, a completed water-supply system shall be tested and proved tight under which condition?

• AA 10-foot head of water for 5 minutes
• BWater pressure not less than the working pressure of the system, or, for piping other tha…
• CA 5 psi air test on plastic PEX and CPVC
• DCity pressure only, with no timed hold

The water main delivers 42 psi at the meter. A shower with a balanced-pressure mixing valve is 52 feet above the meter. Ignoring friction, what is the residual static pressure at the shower, and does it meet IPC Table 604.3?

• A22.5 psi remaining; it meets the 8 psi shower listing
• B19.5 psi remaining; it does not meet the 20 psi required for a balanced-pressure, thermos…
• C42 psi remaining; elevation does not affect static pressure
• D52 psi remaining; residual pressure equals the height in feet

A tank-type water closet (Table 604.3: 3 gpm at 20 psi) is 40 feet above a meter that reads 55 psi. After elevation loss, what residual static pressure remains, and which IPC 2021 action is required if friction later drops the fixture below 20 psi?

• A38.7 psi remaining; install a PRV because residual pressure exceeds 20 psi
• B17.3 psi remaining; the closet already fails Table 604.3 and needs a booster before frict…
• C37.7 psi remaining; if friction then reduces fixture pressure below Table 604.3, install…
• D55 psi remaining; boosters are used only when street pressure exceeds 80 psi

Per IPC 2021 Table 308.5, what is the maximum horizontal hanger spacing for PVC pipe?

• A2 feet 8 inches
• B4 feet
• C10 feet
• D12 feet

Per IPC 2021 Table 308.5, cast-iron pipe is hung at 5 feet horizontally, except that the horizontal spacing may be increased to 10 feet when which condition is met?

• AThe pipe is hubless
• B10-foot lengths of pipe are installed
• CThe pipe is under 2 inches in diameter
• DThe pipe is vertical

Per IPC 2021 Table 308.5, what is the maximum horizontal support spacing for PEX pipe 1 inch and smaller?

• A2.67 feet (32 inches)
• B4 feet
• C6 feet
• D10 feet