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District of Columbia-Plumbing Online Practice Test

These are actual questions from our online practice test.

We have included a question from each chapter of the test. Every question will be multiple choice. The answers are not included with the sample.

Sample Questions

# Chapter Title Question
1 Pipes, Water Pressure, Pipe Fittings and Hydronics

Excessive heat or pressure may cause the system to fail. At least one combination over-temperature and over-pressure relief valve is always fitted to the system to allow the steam or water to vent to the atmosphere in case of the failure.

2 Plumbing, Valves, Gas Pipes, Oxygen, Gas Cylinders and Water Heaters All manholes must be equiped with _________.
3 Values, Drainage, Vents and Standpipes Steel fittings used in a water piping system within a building must be _________.
4 Plumbing, PSI, Water Pressure, Water Flow, Pipelines and Water Pressure What are horizontal directional drilling methods mainly used for?
5 Plumbing, Valves, Water Heaters, Gas Pipes, Oxygen and Gas Cylinders All manholes must be equiped with _________.
6 Plumbing, Appliances, Drains, Fixtures and Inspections __________ is exempt from drainage system rough in testing.
7 Plumbing, Installation and Repairs When is a plumbing permit not required?
8 Welding, Blazing, Arc, Oxyacetylene, Testing and Inspection What is the junction of the weld metal and base called?
9 Excavating, Drainage, Compaction and Sitework 4" drainage pipe of approved material having perforated holes would be installed _________
10 Underground Drainage and Pipelines What are the types of welded joints available for steel pipe?
11 Installation, Pipes, Drainage and Trenches What are the types of welded joints available for steel pipe?
12 Coatings and Control Corrosion The use of high strength cementitious materials top coated with _____ coatings is a cost effective solution to renewal of severely deteriorated structures.
13 Installation, Joints, Field Elevations, Sewers and Sewer Testing The necessary elevation of the bottom of the tank can be calculated from the _________________.
14 Installation, Pipes, Leach Fields and Tanks Sewer line connections to existing lines or manholes are not made until upstream lines have been _____________.
15 Installing Irrigation Pipes

What is the main cause of plugged heads and valves in the irrigation system?

16 Plumbing, Septic Tanks, Drainage and Gas Lines The combustion chamber of a gas fired water heater installed in a private garage must be above the floor at least ________ inches.
17 Sewer Maintenance and Repair The "repair-as-is" option for completely failed drain fields, if permitted by the health department, includes _______________.
18 Sewer System, Location Sites and Soil Conditions Prior to clearing critical grading jobs, it may be necessary to have a _____________ sample and inspect the material and construction site soils.
19 System Design, Tank Size, Soils, Pathogens and Gases The standard drain field for the pressure distribution system consists of perforated pipes, which are _____________ in diameter.
20 Sanitary Sewers, Storm Sewers and Septic Tanks Exfiltration tests for storm sewers shall indicate leakage of no more than ___ gal/hr per inch of diameter per 100 feet of pipe.
21 Construction Safety As part of the safety training process, contractors' supervisors are required to conduct "toolbox" and "tailgate" safety meeting. How often must these be held?
22 OSHA Safety, Dig Alert, Asbestos and Code of Federal Regulations, Title 29, Part 1926 According to the APWA Uniform color code, the color red identifies ___________.
23 Bid Preparation and Estimating The notice to owner contained in a contract, informs the customer of _________________.
24 Employees, Contractors, Insurance and Safety Upon request by the prime contractor, the subcontractor is responsible for submitting faithful ____________.
25 Mathematics, Calculations and Formulas What is the hypotenuse?


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