CT Unlimited Plumbing Journeyperson
(P-2) Exam Practice Questions And
Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1. Under generally accepted plumbing principles and model plumbing
codes, what is the primary purpose of a plumbing trap installed
beneath a fixture outlet?
A. To increase water pressure at the fixture
B. To filter solids before they enter the drainage system
C. To maintain a water seal that prevents sewer gases from entering the
occupied space
D. To eliminate the need for a vent connection
Answer: C
Rationale: A plumbing trap retains a water seal that blocks sewer gases
and odors from traveling from the drainage system into the building
while allowing wastewater to pass through.
2. A plumbing fixture trap is repeatedly losing its seal because of
negative pressure created when wastewater flows rapidly through
the drainage system. Which installation component is primarily
intended to prevent this condition?
,A. A cleanout
B. A vent system
C. A grease interceptor
D. A backwater valve
Answer: B
Rationale: The vent system equalizes air pressure within the drainage
system and helps protect trap seals from siphonage or backpressure.
3. When determining the proper slope for a horizontal drainage pipe,
why is excessive slope generally undesirable?
A. It causes wastewater to freeze more easily
B. It may allow liquids to flow faster than solids, potentially leaving solids
behind
C. It prevents the pipe from being properly vented
D. It always causes excessive water pressure
Answer: B
Rationale: Excessive slope can permit liquid to outrun suspended solids,
increasing the possibility of solids accumulating within the piping
system.
4. What is the principal purpose of installing a cleanout in a drainage
system?
A. To provide a location for adding potable water
B. To allow access for inspection, cleaning, and removal of obstructions
,C. To increase drainage velocity
D. To replace a plumbing trap
Answer: B
Rationale: Cleanouts provide accessible openings through which
drainage piping can be inspected and mechanically cleaned when
blockages occur.
5. Which statement best describes the purpose of a plumbing vent
terminal extending through a roof?
A. It increases water pressure throughout the building
B. It provides a pathway for air exchange and releases sewer-system gases
safely above the building
C. It acts as the primary overflow for roof drainage
D. It prevents wastewater from entering the building sewer
Answer: B
Rationale: Vent terminals permit air circulation within the plumbing
drainage system and direct sewer gases to a location where they can
disperse safely.
6. A journeyperson is installing potable water piping. Why is protection
against cross-connections essential?
A. Cross-connections improve water circulation too much
B. Cross-connections can allow contaminated water to enter the potable
water supply through backflow
, C. Cross-connections prevent adequate drainage
D. Cross-connections reduce the temperature of hot water
Answer: B
Rationale: A cross-connection can create a pathway through which
contaminants enter potable water piping, particularly during backflow
conditions.
7. What condition exists when downstream pressure becomes greater
than supply pressure and forces water to flow in the reverse
direction?
A. Water hammer
B. Backpressure
C. Cavitation
D. Siphonage
Answer: B
Rationale: Backpressure occurs when pressure on the downstream side
exceeds supply pressure, creating a potential reverse flow condition.
8. What condition can cause backsiphonage in a potable water
system?
A. An increase in municipal supply pressure
B. A sudden reduction in supply pressure creating a partial vacuum
C. Excessively high drainage slope
D. Increased insulation around a water pipe
Answer: B
(P-2) Exam Practice Questions And
Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1. Under generally accepted plumbing principles and model plumbing
codes, what is the primary purpose of a plumbing trap installed
beneath a fixture outlet?
A. To increase water pressure at the fixture
B. To filter solids before they enter the drainage system
C. To maintain a water seal that prevents sewer gases from entering the
occupied space
D. To eliminate the need for a vent connection
Answer: C
Rationale: A plumbing trap retains a water seal that blocks sewer gases
and odors from traveling from the drainage system into the building
while allowing wastewater to pass through.
2. A plumbing fixture trap is repeatedly losing its seal because of
negative pressure created when wastewater flows rapidly through
the drainage system. Which installation component is primarily
intended to prevent this condition?
,A. A cleanout
B. A vent system
C. A grease interceptor
D. A backwater valve
Answer: B
Rationale: The vent system equalizes air pressure within the drainage
system and helps protect trap seals from siphonage or backpressure.
3. When determining the proper slope for a horizontal drainage pipe,
why is excessive slope generally undesirable?
A. It causes wastewater to freeze more easily
B. It may allow liquids to flow faster than solids, potentially leaving solids
behind
C. It prevents the pipe from being properly vented
D. It always causes excessive water pressure
Answer: B
Rationale: Excessive slope can permit liquid to outrun suspended solids,
increasing the possibility of solids accumulating within the piping
system.
4. What is the principal purpose of installing a cleanout in a drainage
system?
A. To provide a location for adding potable water
B. To allow access for inspection, cleaning, and removal of obstructions
,C. To increase drainage velocity
D. To replace a plumbing trap
Answer: B
Rationale: Cleanouts provide accessible openings through which
drainage piping can be inspected and mechanically cleaned when
blockages occur.
5. Which statement best describes the purpose of a plumbing vent
terminal extending through a roof?
A. It increases water pressure throughout the building
B. It provides a pathway for air exchange and releases sewer-system gases
safely above the building
C. It acts as the primary overflow for roof drainage
D. It prevents wastewater from entering the building sewer
Answer: B
Rationale: Vent terminals permit air circulation within the plumbing
drainage system and direct sewer gases to a location where they can
disperse safely.
6. A journeyperson is installing potable water piping. Why is protection
against cross-connections essential?
A. Cross-connections improve water circulation too much
B. Cross-connections can allow contaminated water to enter the potable
water supply through backflow
, C. Cross-connections prevent adequate drainage
D. Cross-connections reduce the temperature of hot water
Answer: B
Rationale: A cross-connection can create a pathway through which
contaminants enter potable water piping, particularly during backflow
conditions.
7. What condition exists when downstream pressure becomes greater
than supply pressure and forces water to flow in the reverse
direction?
A. Water hammer
B. Backpressure
C. Cavitation
D. Siphonage
Answer: B
Rationale: Backpressure occurs when pressure on the downstream side
exceeds supply pressure, creating a potential reverse flow condition.
8. What condition can cause backsiphonage in a potable water
system?
A. An increase in municipal supply pressure
B. A sudden reduction in supply pressure creating a partial vacuum
C. Excessively high drainage slope
D. Increased insulation around a water pipe
Answer: B
