PLUMBING PRACTICAL PROBLEM EXAM
1. Identify which of the following is a plumbing fixture?
A. Floor drain
B. Faucet
C. Water meter
D. Gate valve
2. Which of the following is the minimum fixture supply pipe size of a lavatory?
A. 25 mm
B. 13 mm
C. 10 mm
D. 19 mm
3. How many drinking fountains may be required in a theater with an occupant load of 600?
A. 8
B. 4
C. 2
D. 6
4. Which of the following is classified as permissible trap?
A. Bell trap
B. Full S trap
C. P-trap
D. Mechanically sealed trap
5. What is the discharge rate of a fixture with a drainage fixture unit of 6 fu?
A. 2 cu ft/min
B. 6 cu ft/min
C. 4 cu ft/min
D. 8 cu ft/min
6. The following are the ways to prevent backflow except
A. Backpressure
B. Backwater valve
C. Air gap
D. Check valve
7. Which of the following locations does not require a cleanout?
A. At the upper end of every horizontal soil and waste branch.
B. At every plumbing fixture.
C. Any horizontal soil pipe less than 15 meters.
D. At the base of every soil stack.
8. Identify the type of pump shown below. This type of pump contains an impeller mounted on a
rotating shaft. The rotating impeller increases the velocity of the water while forcing the water into
a casing, converting the velocity of the water into higher pressure.
A. Reciprocating pump
B. Gear pump
C. Screw pump
D. Centrifugal pump
9. Identify the water supply fitting shown below. This is used to change direction and both ends are
internally threaded.
A. Coupling
B. Elbow
C. Union
D. Street tee
10. Which of the following is a flexible plastic or synthetic pipe?
A. Polypropylene (PP)
B. Polyethylene (PE)
C. Acrylonitrile butadiene styrene (ABS)
D. Unplasticized polyvinyl chloride (uPVC)
11. A bidet is a plumbing fixture used for washing the ___.
A. Body
B. External genitalia
C. Face
D. Feet
12. What is considered as the plumber’s friend?
A. Pipefitter
B. Plumber apprentice
C. Force cup
D. Journeyman
13. Which of the following plumbing principle contradicts the National Plumbing Code?
A. Water closet shall be located in a properly lighted and ventilated room.
B. Fixture directly connected to the plumbing system shall be equipped with a water-sealed trap.
C. Plumbing system shall be maintained in a sanitary and serviceable condition.
D. Vent terminal shall not extend above the roof.
14. Which of the following is prohibited under the plumbing code?
A. Providing an air gap or air break between the outlet and the flood level rim of a fixture
B. Using fittings to connect pipes instead of bending
C. Providing a vent pipe to a fixture
D. Double trapping a fixture
15. Which of the following is not a sanitary ware?
A. Kitchen sink
B. Bathtub
C. Urinal
D. Water Closet
16. This refers to the installation of fixtures or parts of the plumbing system which can be completed
prior to the installation of fixtures or finishing.
A. Pipelaying
B. Roughing-in
C. Plumbing assembly
D. Mock-up installation
17. IPS stand for
A. Iron pipe size
B. Internal pipe size
C. Individual plumbing system
D. International piping symbol
18. Which tool is recommended for removing and assembling of lavatory fittings?
A. Spud wrench
B. Monkey wrench
C. Basin wrench
D. Crescent wrench
19. Identify the tool below. This tool is used to make watertight joints between flexible copper tubing
and fitting or valve.
A. Flaring tool
B. Yoke vise
C. Pipe vise
D. Pipe extractor
20. Calculate the velocity of wastewater flowing through a pipe having a cross sectional area of 2 cm2
and a discharge rate of 8 cm3/s.
A. 4 cm/s
B. 6 cm/s
C. 8 cm/s
D. 16 cm/s
21. What characteristic best describes a plastic or synthetic pipe?
A. Low resistance to fluid flow
B. Ease of assembly
C. Hot or cold water system application
D. All of these
22. What type of wrench is used in No-Hub plumbing installation; it is used to ensure accurate specific
tightness, leak-free joint?
A. Allen wrench
B. Strap wrench
C. Pipe wrench
D. Torque wrench
23. What do you call the vertical distance between the top dip and the crown weir of a trap?
A. Overflow
B. Crown
C. Invert
D. Trap seal
24. What is the minimum fixture drain size of a wash basin?
A. 25 mm
B. 32 mm
C. 38 mm
D. 50 mm
25. Stormwater refers to
A. Rainwater, surface run-off
B. Liquid-plus-human waste
C. Waste from laundry, sink, etc.
D. None of the above
