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GA Plumber practice questions

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Question 1General Regulations, Administration and Code Scope

Which document establishes the plumbing requirements that apply as the statewide minimum in Georgia?

  1. The Uniform Plumbing Code as published by the IAPMO association
  2. The International Plumbing Code with Georgia amendments Correct answer.
  3. The Standard Plumbing Code of the ASME
  4. The National Standard Plumbing Code

Explanation

Georgia adopts the International Plumbing Code, as amended by Georgia, as its state minimum standard plumbing code. Local jurisdictions enforce that document and may adopt amendments that are more stringent. The model codes published by other organizations have no statewide standing in Georgia.

Question 2General Regulations, Administration and Code Scope

The fundamental purpose of the plumbing code is to:

  1. safeguard public health, safety and welfare Correct answer.
  2. standardize the wages paid to plumbing trades
  3. establish uniform prices for plumbing installations
  4. limit competition among plumbing contractors

Explanation

Plumbing codes exist to protect the health, safety and general welfare of building occupants and the public. They do that by regulating the design, installation, and maintenance of plumbing systems. Pricing, wages, and competition are outside the scope of a construction code.

Question 3General Regulations, Administration and Code Scope

Before installing a new water distribution system in a commercial building, the installing contractor must first:

  1. notify the local water utility of the work
  2. obtain a permit from the code official Correct answer.
  3. submit as-built drawings to the state board
  4. file a notice of commencement with the county clerk

Explanation

The code requires a permit to be obtained from the code official before regulated plumbing work begins. The permit provides the inspection record and triggers the required inspections. Utility notification and record filings do not substitute for a permit.

Question 4General Regulations, Administration and Code Scope

The Georgia State Board of Plumbing Examiners is administratively located within which office?

  1. The Office of the Secretary of State Correct answer.
  2. The Department of Labor
  3. The Department of Community Affairs
  4. The Department of Public Health

Explanation

Georgia's professional licensing boards, including the State Board of Plumbing Examiners, are housed in the Professional Licensing Boards Division of the Secretary of State. The Department of Community Affairs administers the state minimum standard construction codes. The board issues and disciplines plumber licenses.

Question 5General Regulations, Administration and Code Scope

Rough-in drain, waste and vent piping has been installed in a wall. Before the wall may be closed, the installer must:

  1. obtain approval of the rough-in by the code official Correct answer.
  2. install cleanouts at both ends of every drain line
  3. wait 24 hours after notifying the local utility
  4. submit a notarized statement that the work is complete

Explanation

Piping that will be concealed must be inspected and approved before it is covered. Concealing work that has not been approved prevents the required inspection from being performed. The remedy is to notify the code official and obtain approval of the rough-in first.

Question 6General Regulations, Administration and Code Scope

A local ordinance governing plumbing installation conflicts with the state minimum standard code. Which requirement governs?

  1. Whichever requirement the installer prefers
  2. The state code, because local amendments are void
  3. The more stringent requirement Correct answer.
  4. The local ordinance, because local laws always control

Explanation

Local governments may adopt amendments to the state minimum standard code, but those amendments may not be less stringent than the state minimum. Where the two differ, the stricter provision controls. An installer has no discretion to select the easier requirement.

Question 7General Regulations, Administration and Code Scope

While plumbing work authorized by a permit is in progress, the permit or a copy of it must be:

  1. kept in the contractor's office safe
  2. kept on the job site until the work is complete Correct answer.
  3. filed with the county tax assessor's office
  4. mailed to the state board within 10 days of issuance

Explanation

The code requires the permit or a copy to be kept on the site of the work until the job is completed. This allows the code official to verify that the work is authorized when arriving to inspect. Storing the permit elsewhere defeats that purpose.

Question 8General Regulations, Administration and Code Scope

A contractor disagrees with the code official's interpretation of a vent sizing provision. What is the proper first step?

  1. Request arbitration by the water utility
  2. Ask the state board of plumbing examiners to rule immediately
  3. Appeal the decision to the local board of appeals Correct answer.
  4. Install the system as designed and file suit later

Explanation

The administrative provisions of the plumbing code give a person aggrieved by a decision of the code official the right to appeal to the board of appeals established by the jurisdiction. The appeal must be pursued through that process rather than by self-help. Licensing boards and utilities do not hear code interpretation appeals.

Question 9General Regulations, Administration and Code Scope

Which activity is ordinarily exempt from the requirement to obtain a plumbing permit?

  1. Stopping a leak in an existing drain without replacing pipe Correct answer.
  2. Rerouting a soil stack to serve a new fixture
  3. Replacing a water heater in an existing single-family dwelling
  4. Installing a new bathroom group in a basement

Explanation

The code exempts minor repair work such as stopping leaks in drains, water, soil, waste or vent piping and clearing stoppages, where no concealed piping or trap is replaced. Replacement of appliances such as water heaters and any new or relocated piping require a permit. The exemption is narrow and does not cover new fixtures or rerouted stacks.

Question 10General Regulations, Administration and Code Scope

The contractor wants to relocate a bathroom group from the location shown on the approved plans. The contractor must:

  1. Obtain written approval from the building owner only
  2. Submit revised plans and obtain approval first Correct answer.
  3. Proceed and note the change on the as-built drawing
  4. Proceed, because the code does not regulate layout

Explanation

Work must be done in accordance with the approved plans, and changes require revised plans to be submitted and approved before the changed work is installed. Owner approval alone does not satisfy the code. Field changes recorded only at closeout deprive the code official of the chance to review them.

Question 11General Regulations, Administration and Code Scope

A building constructed decades ago has a plumbing system that was lawful when installed but does not meet current code. Under the code, the system:

  1. must be upgraded whenever the building changes ownership
  2. may be maintained only if the water supply is upgraded first
  3. may continue in use if it is not a hazard to health or safety Correct answer.
  4. must be completely replaced before the building may be occupied

Explanation

Lawfully existing installations are permitted to continue in use and be maintained, provided the continued use is not a distinct hazard to life, health or property. The code does not require wholesale retrofitting of a building each time a new edition is adopted. Unsafe conditions must be corrected when they are identified.

Question 12General Regulations, Administration and Code Scope

A contractor begins a plumbing installation without the required permit. What authority does the code give the code official?

  1. The official may fine the contractor but must allow the work to continue
  2. The official may not act on site without a court order
  3. The official may issue a stop-work order and require a permit Correct answer.
  4. None; the official may only report the matter to the board

Explanation

The code authorizes the code official to order work stopped when it is being done contrary to the code or without a required permit. The work may not resume until the required permit is obtained and compliance is demonstrated. Reporting to a licensing board is a separate remedy, not the limit of the official's authority.

Question 13General Regulations, Administration and Code Scope

A person who holds no Georgia plumbing license offers to install a water service line for pay. Under Georgia law this is:

  1. permitted if the work later passes inspection
  2. unlawful, because plumbing for pay requires a state license Correct answer.
  3. permitted because service lines are outside the building
  4. permitted for work costing less than $500

Explanation

Georgia requires state licensure for persons who engage in plumbing work for compensation, and performing that work without a license is unlawful. Passing an inspection does not cure the licensing violation. Unlicensed practice exposes the person to board action and statutory penalties.

Question 14General Regulations, Administration and Code Scope

Which state agency publishes the Georgia State Minimum Standard Codes, including the plumbing code?

  1. Department of Community Affairs Correct answer.
  2. Department of Natural Resources
  3. Department of Public Health
  4. Public Service Commission

Explanation

The Department of Community Affairs, through its codes advisory process, publishes and maintains the Georgia State Minimum Standard Codes that local governments enforce. The other agencies regulate environmental resources, health programs, and utilities respectively. Publishing the minimum codes is separate from licensing plumbers.

Question 15General Regulations, Administration and Code Scope

Who is responsible for notifying the code official that installed plumbing work is ready for inspection?

  1. The local water utility that serves the building
  2. The material supplier who furnished the pipe and fittings
  3. The property owner, whether or not a contractor is used
  4. The permit holder or installer doing the work Correct answer.

Explanation

The code places the duty to request inspections on the permit holder or the person responsible for the work. The notice must be given when the work is ready and before it is covered. Suppliers and utilities have no duty to call for plumbing inspections.

Question 16General Regulations, Administration and Code Scope

A code official suspects that a joint in a new drain, waste and vent system is defective. The official may require:

  1. removal of the affected piping without any test
  2. a written warranty from the material supplier
  3. nothing, because the installer already tested the system
  4. additional tests of the system at the owner's expense Correct answer.

Explanation

The code empowers the code official to require tests to establish compliance whenever there is reason to question the installation. The cost of those tests is borne by the owner or permit holder, not the jurisdiction. Selecting a test rather than immediate demolition avoids destroying work that may prove compliant.

Question 17General Regulations, Administration and Code Scope

The plumbing code references a product standard such as ASME A112.6.3 for a component. What is the effect of that reference?

  1. It becomes part of the requirements of the code Correct answer.
  2. Only the manufacturer must comply with the standard
  3. It is advisory only and may be ignored by the installer
  4. It applies only to federally funded projects

Explanation

Referenced standards are adopted as part of the code, so compliance with the referenced standard is a code requirement. Both the product and its installation must satisfy the referenced document. The reference is not merely guidance and is not limited to particular project types.

Question 18General Regulations, Administration and Code Scope

A building owner refuses to allow the code official to inspect plumbing work that is under permit. Under the code, the official may:

  1. seek legal remedies to gain entry and inspect Correct answer.
  2. enter forcibly at any time without legal process
  3. revoke the contractor's license immediately
  4. abandon the inspection permanently

Explanation

The code gives the code official the right to enter and inspect premises at reasonable times, and where entry is refused, the official may pursue legal remedies such as obtaining assistance from law enforcement or a warrant. The official may not simply force entry without legal process. Abandoning the inspection would leave the work unverified.

Question 19General Regulations, Administration and Code Scope

A contractor proposes a piping material not listed in the code but certified to an equivalent recognized standard. Who may approve its use?

  1. The material supplier's engineer
  2. The state board of plumbing examiners
  3. The code official, if equivalence is shown Correct answer.
  4. The general contractor with the owner's consent

Explanation

The code allows the code official to approve alternate materials and methods where the proposed alternative is shown to be equivalent in quality, strength, effectiveness and safety to what the code prescribes. Approval authority rests with the code official, not with private parties. The board of plumbing examiners does not rule on individual product approvals.

Question 20General Regulations, Administration and Code Scope

Which of the following systems is regulated by the plumbing code?

  1. Hydraulic power units serving elevators
  2. Fire alarm signaling wiring in a commercial building
  3. Electrical conduit serving sump pumps
  4. Potable water, drain, waste and vent piping Correct answer.

Explanation

The plumbing code governs water supply piping, fixtures and fittings, sanitary and storm drainage, vents, and related appurtenances. Fire alarm wiring and electrical conduit fall under the electrical code, and elevator hydraulic equipment is covered by elevator standards. Each trade code governs its own systems.

Question 21Plumbing Terminology, Symbols and Isometric Analysis

On a plumbing drawing, the abbreviation DWV identifies a system that handles which of the following?

  1. Direct waste and venting
  2. Drainage, waste and vent piping Correct answer.
  3. Drain water and vacuum
  4. Domestic water and valving

Explanation

DWV is the standard abbreviation for the drainage, waste and vent system, the non-pressurized portion of the plumbing that carries sewage, gray water and air. Water supply piping is designated separately, usually as domestic water (DW).

Question 22Plumbing Terminology, Symbols and Isometric Analysis

On a plumbing plan, a pipe run drawn with a dashed line normally indicates that the pipe is ____.

  1. sloped at more than 2 percent
  2. insulated along its full length
  3. sized larger than 3 inches
  4. concealed or installed underground Correct answer.

Explanation

Line type indicates visibility, not size or slope: solid lines show exposed piping and dashed or broken lines show piping that is hidden in a wall, ceiling or below grade. Insulation and size are called out by notes or tags, not by the line style.

Question 23Plumbing Terminology, Symbols and Isometric Analysis

A plumbing isometric is built on three axes. At what angle above horizontal are the two receding axes drawn?

  1. 45 degrees
  2. 15 degrees
  3. 30 degrees Correct answer.
  4. 60 degrees

Explanation

Isometric projection uses one vertical axis and two axes drawn 30 degrees above the horizontal, spaced 120 degrees apart, so equal lengths read equally on all three axes. Angles such as 45 or 60 degrees belong to oblique or other projections, not to isometric.

Question 24Plumbing Terminology, Symbols and Isometric Analysis

In a plumbing takeoff, the developed length of a pipe run is the length ____.

  1. measured along the centerline, including fittings Correct answer.
  2. shown on the drawing before slope is applied
  3. of the longest straight section only
  4. taken between the two end fittings

Explanation

Developed length follows the centerline of the run through every change of direction, so the allowance for fittings and offsets is built into the total. Taking only the straight portions or the net distance between end points understates the pipe actually required.

Question 25Plumbing Terminology, Symbols and Isometric Analysis

The vertical distance between the trap weir and the top of the trap dip is called the ____.

  1. trap arm
  2. trap reach
  3. trap fall
  4. trap seal Correct answer.

Explanation

The trap seal is the depth of water held in the trap between the weir and the top of the dip, and it is what blocks sewer gas. Trap arm refers to the pipe between the trap and its vent, which is a different element.

Question 26Plumbing Terminology, Symbols and Isometric Analysis

A 3-inch horizontal drain is installed at a slope of 1/8 inch per foot. Over a 32-foot run, the total fall is ____.

  1. 4 inches Correct answer.
  2. 8 inches
  3. 16 inches
  4. 2 inches

Explanation

Total fall equals the slope multiplied by the run: 1/8 inch times 32 feet equals 4 inches of drop. Slope is a per-foot rate, so the run length must be multiplied rather than used directly.

Question 27Plumbing Terminology, Symbols and Isometric Analysis

A slope of 1/4 inch per foot is approximately equal to what percentage grade?

  1. 1 percent
  2. 4 percent
  3. 2 percent Correct answer.
  4. 0.5 percent

Explanation

Percentage grade is fall divided by run in the same units: 0.25 inch divided by 12 inches equals about 0.0208, or roughly 2 percent. Comparing 0.25 to 12 directly, rather than converting, gives the smaller answers.

Question 28Plumbing Terminology, Symbols and Isometric Analysis

Where a horizontal drain connects to another horizontal drain in the direction of flow, the preferred fitting is a ____.

  1. wye fitting Correct answer.
  2. sanitary tee
  3. double sanitary tee
  4. quarter bend

Explanation

A wye gives a smooth, sweeping turn in the direction of flow, which limits turbulence and solids buildup on a horizontal-to-horizontal connection. Tee fittings turn the flow sharply and are reserved for vertical-to-horizontal or vented branch connections.

Question 29Plumbing Terminology, Symbols and Isometric Analysis

On a plumbing isometric, a soil stack serving fixtures on several floors is drawn as a ____.

  1. vertical line through the floors Correct answer.
  2. series of 45-degree offsets
  3. heavy line along the bottom edge
  4. dashed line on the floor plan

Explanation

In isometric projection the vertical axis represents true vertical, so a stack appears as a straight vertical line with fixture branches leaving it at each floor. Offsets appear only where the stack actually jogs, and line weight does not define a stack.

Question 30Plumbing Terminology, Symbols and Isometric Analysis

A vent that runs from a single fixture trap up to the vent stack is called a ____.

  1. relief vent
  2. individual vent Correct answer.
  3. loop vent
  4. stack vent

Explanation

An individual, or fixture, vent serves one trap and connects to the vent stack or stack vent above. A stack vent is the extension of a soil stack above the highest fixture, which is a different element.

Question 31Plumbing Terminology, Symbols and Isometric Analysis

In a plumbing isometric, an offset is used to ____.

  1. increase the slope of a drain line
  2. reduce the diameter of a stack
  3. move a pipe run to clear an obstruction Correct answer.
  4. join two pipes of different material

Explanation

An offset is a pair of bends that shifts a pipe sideways or vertically so the run can pass around or through obstructions and then continue in its original direction. It does not change slope permanently, pipe material, or pipe size.

Question 32Plumbing Terminology, Symbols and Isometric Analysis

An air gap is installed in a plumbing system to ____.

  1. increase water pressure at a fixture
  2. prevent backflow by separation Correct answer.
  3. support a vertical stack
  4. silence noise in a drain line

Explanation

An air gap is a physical break between the fixture outlet or faucet and the flood-level rim of the receptacle, so a vacuum cannot pull contaminated water back into the supply. Because the separation is physical, it protects even when pressure fluctuates.

Question 33Plumbing Terminology, Symbols and Isometric Analysis

A combination wye and eighth bend changes the direction of flow by ____.

  1. 45 degrees
  2. 60 degrees
  3. 90 degrees Correct answer.
  4. 22.5 degrees

Explanation

A wye branches at 45 degrees and an eighth bend turns 45 degrees, so the two together produce a full 90-degree change with a sweeping radius. Using the components individually gives only part of the total turn.

Question 34Plumbing Terminology, Symbols and Isometric Analysis

A 4-inch building sewer runs 60 feet at a slope of 1/8 inch per foot. If the upstream invert is at elevation 105.00 ft, what is the downstream invert elevation?

  1. 104.50 ft
  2. 104.38 ft Correct answer.
  3. 103.75 ft
  4. 104.25 ft

Explanation

Total fall is 1/8 inch times 60 feet, or 7.5 inches, which is 0.625 ft. Subtracting that from 105.00 ft gives 104.375 ft, rounded to 104.38 ft.

Question 35Plumbing Terminology, Symbols and Isometric Analysis

A 45-degree offset must shift a pipe 24 inches. What is the travel, the diagonal length of the offset?

  1. 48 inches
  2. 17 inches
  3. 24 inches
  4. 34 inches Correct answer.

Explanation

For a 45-degree offset the travel equals the offset multiplied by 1.414, so 24 inches times 1.414 is about 33.9 inches, or 34 inches. The offset and travel are the legs and hypotenuse of a 45-degree right triangle.

Question 36Plumbing Terminology, Symbols and Isometric Analysis

On a standard plumbing isometric, a pipe drawn as a line running 30 degrees to the horizontal off a vertical stack represents a run that is ____.

  1. offset at 45 degrees
  2. running horizontally Correct answer.
  3. sloped at 30 degrees
  4. running vertically downward

Explanation

The two 30-degree axes of an isometric represent horizontal directions in plan, while only the vertical axis represents true height. The 30-degree angle is a drawing convention, not a real pitch or fitting angle.

Question 37Water Supply and Distribution, Sizing and Materials

What is the minimum nominal diameter permitted for a building water service pipe?

  1. 1/2 inch
  2. 1 inch
  3. 1-1/4 inch
  4. 3/4 inch Correct answer.

Explanation

Plumbing codes set a floor on service pipe size so the building can deliver the required volume and pressure. The minimum nominal size for a building water service pipe is 3/4 inch; smaller sizes cannot reliably carry a whole-building demand.

Question 38Water Supply and Distribution, Sizing and Materials

In a PEX water distribution system, tubing color-coded blue is intended for which service?

  1. Irrigation lines
  2. Hot water distribution
  3. Fire sprinkler lines
  4. Cold water distribution Correct answer.

Explanation

PEX is manufactured in colors that identify the intended service so installers and inspectors can trace lines. Blue denotes cold water, while red denotes hot water; white or natural PEX may be used for either.

Question 39Water Supply and Distribution, Sizing and Materials

Which piping material is prohibited in a potable water supply system?

  1. Lead Correct answer.
  2. Galvanized steel
  3. Copper
  4. CPVC

Explanation

Lead pipe and lead-based solder are prohibited in potable water systems because lead leaches into the water and creates a health hazard. Copper, CPVC, and galvanized steel are all permitted materials, subject to their own installation rules.

Question 40Water Supply and Distribution, Sizing and Materials

What minimum residual pressure must be maintained at a flushometer valve for it to operate properly?

  1. 10 psi
  2. 8 psi
  3. 15 psi Correct answer.
  4. 5 psi

Explanation

Flushometer valves need a stronger pressure push than ordinary fixtures to reset and deliver a measured flush. The code requires 15 psi flowing at the flushometer valve, compared with 8 psi at other fixture outlets.

Question 41Water Supply and Distribution, Sizing and Materials

Above what static pressure must a pressure-reducing valve be installed on a water distribution system?

  1. 80 psi Correct answer.
  2. 150 psi
  3. 125 psi
  4. 100 psi

Explanation

Excessive static pressure damages fixtures, valves, and appliances and causes noise and wasted water. The code caps static pressure at 80 psi, so a pressure-reducing valve is required whenever the supply exceeds that value.

Question 42Water Supply and Distribution, Sizing and Materials

What is the purpose of a water hammer arrestor?

  1. Filter sediment
  2. Increase flow velocity
  3. Prevent pipe freezing
  4. Absorb pressure surges Correct answer.

Explanation

Water hammer is the pressure spike created when a valve closes quickly and the moving column of water is stopped abruptly. An arrestor contains a cushion of air or a mechanical bellows that absorbs the surge and protects the piping.

Question 43Water Supply and Distribution, Sizing and Materials

How must the discharge pipe from a water heater temperature and pressure relief valve terminate?

  1. Into the cold water inlet line
  2. Into the drain pan outlet without an air gap
  3. Through an air gap at a floor drain or outside the building Correct answer.
  4. Directly into the building drain with a trap

Explanation

The relief valve discharge must be visible and must not be able to back up into the heater or contaminate anything. It therefore terminates through an air gap, typically not more than 6 inches above a floor drain or outside the building, with no trap and no fittings that reduce the line.

Question 44Water Supply and Distribution, Sizing and Materials

Which backflow assembly is required for a high-hazard connection such as a boiler feed or chemical injection line?

  1. Reduced pressure zone assembly Correct answer.
  2. Double check valve assembly
  3. Pressure vacuum breaker
  4. Atmospheric vacuum breaker

Explanation

High-hazard connections require protection that can relieve either backsiphonage or backpressure and that fails safe. A reduced pressure zone assembly provides that protection; double check and vacuum breaker devices are limited to low-hazard or non-backpressure conditions.

Question 45Water Supply and Distribution, Sizing and Materials

When the flow rate through a fixed-diameter pipe is doubled, the friction loss increases by a factor of approximately:

  1. No change
  2. About twice
  3. About eight times
  4. About four times Correct answer.

Explanation

Friction head loss in a pipe varies roughly as the 1.85 power of the flow rate under the Hazen-Williams method. Doubling the flow therefore multiplies friction loss by about 3.6, which is close to four times.

Question 46Water Supply and Distribution, Sizing and Materials

A service has a static pressure of 110 psi. What downstream pressure is typically set on a pressure-reducing valve?

  1. 90 psi
  2. 110 psi
  3. 50 psi Correct answer.
  4. 25 psi

Explanation

Standard practice sets the reduced pressure in the range of about 50 to 60 psi, which protects fixtures while still supplying adequate pressure at the highest outlet. Anything near 80 psi defeats the purpose of the valve.

Question 47Water Supply and Distribution, Sizing and Materials

A water heater is installed on a system with a backflow preventer at the meter. What must be added to accommodate thermal expansion?

  1. A recirculating pump
  2. A larger water heater
  3. A thermal expansion tank Correct answer.
  4. A second check valve

Explanation

A backflow preventer creates a closed system, so water heated in the tank has nowhere to expand. A thermal expansion tank gives the expanding water a place to go and prevents pressure spikes and relief valve discharge.

Question 48Water Supply and Distribution, Sizing and Materials

How is the developed length of a water piping run determined?

  1. As the vertical rise from the meter to the highest fixture
  2. As the straight-line horizontal distance between the two end points
  3. As the total length of pipe without any allowance for fittings
  4. Along the centerline of the pipe run, including all fittings Correct answer.

Explanation

Developed length is the true path the water travels, measured along the centerline of the pipe from the source to the farthest outlet. Because fittings add equivalent length, the measured run and the fitting allowances together make up the total used for sizing.

Question 49Water Supply and Distribution, Sizing and Materials

What is the maximum flow velocity generally permitted in a building water distribution system?

  1. 12 feet per second
  2. 15 feet per second
  3. 4 feet per second
  4. 8 feet per second Correct answer.

Explanation

Velocity limits control noise, erosion-corrosion, and water hammer in piping. The code caps flow velocity at 8 feet per second in the water distribution system.

Question 50Water Supply and Distribution, Sizing and Materials

How many fixture units are assigned to a tank-type water closet?

  1. 4 fixture units
  2. 10 fixture units
  3. 2.5 fixture units Correct answer.
  4. 1 fixture unit

Explanation

Fixture units express the probable load a fixture places on the supply system. A tank-type water closet is rated at 2.5 fixture units, while a flushometer-tank or flushometer-valve closet carries a much higher rating.