Plumber - 250_PA_PH Contractor Exam Questions and

Pennsylvania (Philadelphia) Standard Journeyman Plumber - 250_PA_PH Contractor Exam Questions and Answers Best rated A+ Guaranteed Success Latest Update

1.

The minimum slope required for a 3-inch horizontal drainage pipe is:

• 1/8 inch per foot
• 1/4 inch per foot [ANSWER]
• 3/8 inch per foot
• 1/2 inch per foot

Rationale: Per code, drainage pipes 3 inches or smaller must slope at least 1/4 inch per foot to maintain velocity for self-cleaning. Larger pipes (≥4") may use 1/8 inch per foot.

2.What type of pipe is not permitted for use in a water distribution system in Philadelphia?

• Copper (Type L)

B. CPVC

C. PEX

• Galvanized steel [ANSWER]

Rationale: Galvanized steel is prohibited due to corrosion and scaling. Copper, CPVC, and PEX are approved for water distribution under current codes.

3.

A cleanout must be installed:

• At the base of every stack
• At each change of direction greater than 45° in building drains
• Every 100 feet in horizontal drainage piping
• All of the above [ANSWER]

Rationale: Code requires cleanouts at stack bases, directional changes, and at intervals depending on pipe size. 1 / 4

4.

The maximum developed length of a 1½-inch trap arm without a vent is:

• 2 feet
• 3 feet
• 3 feet 6 inches [ANSWER]
• 5 feet

Rationale: Trap arms have strict limits to prevent siphoning. A 1½-inch trap arm is limited to 3'6".

5.

The fixture unit value assigned to a private bathtub is:

• 1

B. 2 [ANSWER]

• 3
• 4

Rationale: Per the plumbing fixture unit table, bathtubs are 2 fixture units in residential applications.

6.

A water closet with a flush tank is rated at:

• 2 fixture units
• 3 fixture units
• 2.5 fixture units [ANSWER]
• 4 fixture units

Rationale: Flush-tank toilets are generally rated at 2.5 fixture units under code.

7.

The minimum size vent serving a water closet is:

• 1 inch
• 1¼ inch 2 / 4

• 1½ inch [ANSWER]
• 2 inch

Rationale: Minimum vent size for a single WC is 1½". For multiple fixtures or longer runs, 2" may be required.

8.What is the maximum distance between a trap and its vent for a 2-inch trap arm?

• 3 feet
• 4 feet
• 5 feet [ANSWER]
• 6 feet

Rationale: Trap arm length is based on diameter; 2" trap arms can extend up to 5 feet before venting is required.

9.

A sump pump discharge must terminate:

• Into a floor drain
• Directly into a sanitary sewer
• To an approved discharge point with an air gap [ANSWER]
• Into a storm drain

Rationale: Discharge must prevent cross-connection and backflow; an air gap is required.

10.The minimum burial depth for underground water service piping in Philadelphia is:

• 12 inches
• 18 inches
• 36 inches [ANSWER]
• 48 inches

Rationale: Water service pipes must be buried below the frost line, which in Philadelphia requires 36" depth.

• / 4

11.Which type of fitting is prohibited in drainage piping?

• 45° elbow
• Long sweep elbow
• Short-radius 90° elbow [ANSWER]
• Wye branch

Rationale: Short-radius 90° elbows restrict flow and are not permitted in drainage systems.

12.

The minimum size building drain for a house with two bathrooms and 20 DFUs is:

• 2 inch
• 3 inch
• 4 inch [ANSWER]
• 6 inch

Rationale: Residential building drains are typically 4 inches minimum when serving more than one bathroom group.

13.

The air test for a drainage system requires:

• 5 psi for 5 minutes
• 10 psi for 10 minutes
• 5 psi for 15 minutes [ANSWER]
• 10 psi for 15 minutes

Rationale: Code requires a 5 psi air pressure test for a minimum of 15 minutes with no pressure drop.

14.The maximum spacing of supports for horizontal copper tubing (Type L) 1 inch in diameter is:

• 4 feet
• 6 feet [ANSWER]
• 8 feet
• 10 feet
• / 4