Ohio Journeyman Plumber Exam
d d d
Practice Questions And Correct Answers (V
d d d d d
erified Answers) Plus Rationales 2026|202
d d d d
7 Q&A | Instant Download Pdf
d d d d d
1. The minimum size water service pipe allowed for a single-
d d d d d d d d d d
family dwelling is: d d
A. ½ inch d
B. ¾ inch d
C. 1 inch d
D. 1 ¼ inch d d
¾ inch
d
Rationale: Most plumbing codes, including Ohio, set ¾ inch as the minimu
d d d d d d d d d d d
m water service size for adequate flow and pressure.
d d d d d d d d
2. A plumbing vent must terminate how far above the roof?
d d d d d d d d d
A. 4 inches d
B. 6 inches d
, C. 8 inches
d
D. 6 inches minimum
d d d
6 inches minimum
d d
Rationale: Vents must extend at least 6 inches above the roof surface t
d d d d d d d d d d d d
o prevent blockages from snow and debris.
d d d d d d
3. The minimum slope for horizontal drainage piping smaller than 4 i
d d d d d d d d d d
nches is: d
A. 1/8 inch per foot d d d
B. 1/4 inch per foot d d d
C. 3/8 inch per foot d d d
D. 1/2 inch per foot d d d
1/4 inch per foot
d d d
Rationale: Codes require ¼ inch per foot slope for pipes less than 4 inch
d d d d d d d d d d d d d
es to maintain proper flow and prevent clogging.
d d d d d d d
4. The maximum vertical distance between a trap and its vent is:
d d d d d d d d d d
A. 2 feet d
B. 4 feet d
C. 6 feet d
D. 10 feet d
6 feet
d
Rationale: Code limits trap-to- d d d
vent distance to 6 feet for typical fixture drains to avoid siphoning.
d d d d d d d d d d d
,5. A cleanout must be installed at every change of direction greater than:
d d d d d d d d d d d
A. 30 degrees d
B. 45 degrees d
C. 90 degrees d
D. 180 degrees d
90 degrees
d
Rationale: Cleanouts are required at changes of direction of 90 degree
d d d d d d d d d d
s or more to allow rodding access.
d d d d d d
6. The minimum size trap for a bathtub is:
d d d d d d d
A. 1 ¼ inch
d d
B. 1 ½ inch
d d
C. 2 inches
d
D. 2 ½ inchesd d
1 ½ inch
d d
Rationale: Bathtubs require 1½ inch traps for sufficient drainage.
d d d d d d d d
7. The minimum size vent for a water closet is:
d d d d d d d d
A. 1 ¼ inch
d d
B. 1 ½ inch
d d
C. 2 inches
d
D. 3 inches d
2 inches
d
Rationale: Toilets require a 2-inch minimum vent size per code.
d d d d d d d d d
, 8. A plumbing vent cannot terminate within how many feet horizontally
d d d d d d d d d d
of a building air intake?
d d d d
A. 6 feet d
B. 10 feet d
C. 12 feet d
D. 15 feet d
10 feet d
Rationale: Vents must be at least 10 feet away horizontally from air intak
d d d d d d d d d d d d
es to prevent odors from entering buildings.
d d d d d d
9. The minimum depth of a building sewer below grade is:
d d d d d d d d d
A. 12 inches d
B. 18 inches d
C. 24 inches d
D. 30 inches d
12 inches
d
Rationale: Sewers must be buried at least 12 inches to provide frost an
d d d d d d d d d d d d
d mechanical protection.
d d
10. What is the maximum spacing of supports for horizontal copper t
d d d d d d d d d d
ubing (½ inch)? d d
A. 4 feet d
B. 6 feet d
C. 8 feet d
D. 10 feet d
d d d
Practice Questions And Correct Answers (V
d d d d d
erified Answers) Plus Rationales 2026|202
d d d d
7 Q&A | Instant Download Pdf
d d d d d
1. The minimum size water service pipe allowed for a single-
d d d d d d d d d d
family dwelling is: d d
A. ½ inch d
B. ¾ inch d
C. 1 inch d
D. 1 ¼ inch d d
¾ inch
d
Rationale: Most plumbing codes, including Ohio, set ¾ inch as the minimu
d d d d d d d d d d d
m water service size for adequate flow and pressure.
d d d d d d d d
2. A plumbing vent must terminate how far above the roof?
d d d d d d d d d
A. 4 inches d
B. 6 inches d
, C. 8 inches
d
D. 6 inches minimum
d d d
6 inches minimum
d d
Rationale: Vents must extend at least 6 inches above the roof surface t
d d d d d d d d d d d d
o prevent blockages from snow and debris.
d d d d d d
3. The minimum slope for horizontal drainage piping smaller than 4 i
d d d d d d d d d d
nches is: d
A. 1/8 inch per foot d d d
B. 1/4 inch per foot d d d
C. 3/8 inch per foot d d d
D. 1/2 inch per foot d d d
1/4 inch per foot
d d d
Rationale: Codes require ¼ inch per foot slope for pipes less than 4 inch
d d d d d d d d d d d d d
es to maintain proper flow and prevent clogging.
d d d d d d d
4. The maximum vertical distance between a trap and its vent is:
d d d d d d d d d d
A. 2 feet d
B. 4 feet d
C. 6 feet d
D. 10 feet d
6 feet
d
Rationale: Code limits trap-to- d d d
vent distance to 6 feet for typical fixture drains to avoid siphoning.
d d d d d d d d d d d
,5. A cleanout must be installed at every change of direction greater than:
d d d d d d d d d d d
A. 30 degrees d
B. 45 degrees d
C. 90 degrees d
D. 180 degrees d
90 degrees
d
Rationale: Cleanouts are required at changes of direction of 90 degree
d d d d d d d d d d
s or more to allow rodding access.
d d d d d d
6. The minimum size trap for a bathtub is:
d d d d d d d
A. 1 ¼ inch
d d
B. 1 ½ inch
d d
C. 2 inches
d
D. 2 ½ inchesd d
1 ½ inch
d d
Rationale: Bathtubs require 1½ inch traps for sufficient drainage.
d d d d d d d d
7. The minimum size vent for a water closet is:
d d d d d d d d
A. 1 ¼ inch
d d
B. 1 ½ inch
d d
C. 2 inches
d
D. 3 inches d
2 inches
d
Rationale: Toilets require a 2-inch minimum vent size per code.
d d d d d d d d d
, 8. A plumbing vent cannot terminate within how many feet horizontally
d d d d d d d d d d
of a building air intake?
d d d d
A. 6 feet d
B. 10 feet d
C. 12 feet d
D. 15 feet d
10 feet d
Rationale: Vents must be at least 10 feet away horizontally from air intak
d d d d d d d d d d d d
es to prevent odors from entering buildings.
d d d d d d
9. The minimum depth of a building sewer below grade is:
d d d d d d d d d
A. 12 inches d
B. 18 inches d
C. 24 inches d
D. 30 inches d
12 inches
d
Rationale: Sewers must be buried at least 12 inches to provide frost an
d d d d d d d d d d d d
d mechanical protection.
d d
10. What is the maximum spacing of supports for horizontal copper t
d d d d d d d d d d
ubing (½ inch)? d d
A. 4 feet d
B. 6 feet d
C. 8 feet d
D. 10 feet d
