Massachusetts Journeyman Plumbing
[Code (248 CMR} 2026-2027 Comprehensive
Frequently Tested Exam Questions With
Verified Multiple Choice and Conceptual
Actual 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. How must a trench be properly backfilled?
A. Backfilled entirely with loose soil
B. Backfilled to grade and compacted once
C. Backfilled until the crown of the pipe is buried 2 feet, then tamped every 6
inches
D. Backfilled only after pressure testing
Correct Answer: C
2. In a building of 10 stories or more, where must relief vents be located and
what size must they be?
A. At the roof only, one size smaller than the vent stack
B. Every 10 stories, same size as the vent stack to which it connects
C. At the basement only, oversized
D. Every floor, minimum 2 inches
Correct Answer: B
3. How far must a vent termination through the roof be from a fresh air intake?
,A. 10 feet
B. 15 feet
C. 25 feet, unless 2 feet above the intake then 10 feet
D. 5 feet
Correct Answer: C
4. Which three locations require shutoff valves in a residential water system?
A. Main drain, lavatory, toilet
B. After the meter, water heater feed, outside faucet
C. Every fixture
D. Only at the water heater
Correct Answer: B
5. How many fixture (factor) valves are required for a washing machine?
A. One
B. Two
C. Three
D. Four
Correct Answer: B
6. Large industrial gas piping installations must be pressure tested at:
A. Twice the working pressure for 30 minutes
B. Five times the working pressure for one hour
C. At least ten times the proposed working pressure for one hour per 10 feet
D. Operating pressure only
Correct Answer: C
,7. What is the maximum allowed length for a fixture supply line?
A. 18 inches
B. 24 inches
C. 30 inches
D. 36 inches
Correct Answer: C
8. What size tracer wire is required for buried gas piping?
A. 10 gauge
B. 12 gauge
C. 14 gauge
D. 16 gauge
Correct Answer: C
9. What is the required pitch for a 3-inch drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. Level
Correct Answer: B
10. What is the minimum capacity for a sewage ejector system serving a single
dwelling with all fixtures?
A. 10 GPM
B. 15 GPM
, C. 20 GPM
D. 30 GPM
Correct Answer: C
11. When is a water hammer arrester required?
A. On all water lines
B. Only on hot water lines
C. When quick-acting valves are installed
D. Only on commercial systems
Correct Answer: C
12. How must an air break be piped?
A. Above the flood level rim
B. Below the flood level rim of the fixture it serves
C. Directly into the trap
D. Through the vent system
Correct Answer: B
13. If domestic water and sanitary drains are installed in the same trench, what
drainage material must be used?
A. PVC
B. ABS
C. Tarred cast iron with lead and oakum joints
D. Copper
Correct Answer: C
[Code (248 CMR} 2026-2027 Comprehensive
Frequently Tested Exam Questions With
Verified Multiple Choice and Conceptual
Actual 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. How must a trench be properly backfilled?
A. Backfilled entirely with loose soil
B. Backfilled to grade and compacted once
C. Backfilled until the crown of the pipe is buried 2 feet, then tamped every 6
inches
D. Backfilled only after pressure testing
Correct Answer: C
2. In a building of 10 stories or more, where must relief vents be located and
what size must they be?
A. At the roof only, one size smaller than the vent stack
B. Every 10 stories, same size as the vent stack to which it connects
C. At the basement only, oversized
D. Every floor, minimum 2 inches
Correct Answer: B
3. How far must a vent termination through the roof be from a fresh air intake?
,A. 10 feet
B. 15 feet
C. 25 feet, unless 2 feet above the intake then 10 feet
D. 5 feet
Correct Answer: C
4. Which three locations require shutoff valves in a residential water system?
A. Main drain, lavatory, toilet
B. After the meter, water heater feed, outside faucet
C. Every fixture
D. Only at the water heater
Correct Answer: B
5. How many fixture (factor) valves are required for a washing machine?
A. One
B. Two
C. Three
D. Four
Correct Answer: B
6. Large industrial gas piping installations must be pressure tested at:
A. Twice the working pressure for 30 minutes
B. Five times the working pressure for one hour
C. At least ten times the proposed working pressure for one hour per 10 feet
D. Operating pressure only
Correct Answer: C
,7. What is the maximum allowed length for a fixture supply line?
A. 18 inches
B. 24 inches
C. 30 inches
D. 36 inches
Correct Answer: C
8. What size tracer wire is required for buried gas piping?
A. 10 gauge
B. 12 gauge
C. 14 gauge
D. 16 gauge
Correct Answer: C
9. What is the required pitch for a 3-inch drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. Level
Correct Answer: B
10. What is the minimum capacity for a sewage ejector system serving a single
dwelling with all fixtures?
A. 10 GPM
B. 15 GPM
, C. 20 GPM
D. 30 GPM
Correct Answer: C
11. When is a water hammer arrester required?
A. On all water lines
B. Only on hot water lines
C. When quick-acting valves are installed
D. Only on commercial systems
Correct Answer: C
12. How must an air break be piped?
A. Above the flood level rim
B. Below the flood level rim of the fixture it serves
C. Directly into the trap
D. Through the vent system
Correct Answer: B
13. If domestic water and sanitary drains are installed in the same trench, what
drainage material must be used?
A. PVC
B. ABS
C. Tarred cast iron with lead and oakum joints
D. Copper
Correct Answer: C
