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Connecticut (CT) J-4 Limited Lawn Sprinkler
Journeyperson Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple choice questions is designed for the Connecticut J-4
Limited Lawn Sprinkler Journeyperson Exam. The examination is a closed-book,
multiple-choice test that evaluates competency in core trade areas including hydraulics and
piping, system components, backflow prevention, low-voltage electrical, installation and
site conditions, applicable codes and regulations, and maintenance and troubleshooting.
The exam is administered by the Connecticut Department of Consumer Protection (DCP)
and PSI Services.
QUESTION 1
Which of the following best describes the scope of work permitted under a Connecticut
J-4 Limited Lawn Sprinkler Journeyperson license?
A. Installation of residential fire sprinkler systems
B. Design and installation of municipal water mains
C. Installation, repair, and maintenance of lawn sprinkler systems while employed by a
licensed plumbing or sprinkler contractor
D. Independent contracting for any irrigation work under $5,000
CORRECT ANSWER: C
EXPERT RATIONALE: The J-4 license explicitly allows installation, repair, and maintenance
of lawn sprinkler systems only when working under a properly licensed contractor; it
does not permit independent contracting.
QUESTION 2
To qualify for the Connecticut J-4 examination, how many hours of related instruction
must be completed in a registered apprenticeship program?
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A. 72 hours
B. 100 hours
C. 144 hours
D. 200 hours
CORRECT ANSWER: C
EXPERT RATIONALE: A registered 1-year apprenticeship program requires 144 hours of
related instruction plus 2,000 hours of on-the-job training to sit for the exam.
QUESTION 3
What is the minimum required on-the-job training hours for the J-4 apprenticeship
pathway?
A. 1,000 hours
B. 1,500 hours
C. 2,000 hours
D. 4,000 hours
CORRECT ANSWER: C
EXPERT RATIONALE: The J-4 license requires completion of a program with 2,000 hours
of OJT, equating to one year of full-time practical experience.
QUESTION 4
The J-4 examination is administered by which entities?
A. Connecticut Department of Labor and PSI Services
B. Department of Consumer Protection and PSI Services
C. Connecticut Irrigation Association and Prometric
D. Department of Public Health and Pearson VUE
CORRECT ANSWER: B
EXPERT RATIONALE: The exam is jointly administered by the Department of Consumer
Protection (DCP) and PSI Services.
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QUESTION 5
What is the maximum voltage allowed for low-voltage wiring in lawn sprinkler control
systems?
A. 12 volts
B. 24 volts
C. 30 volts
D. 48 volts
CORRECT ANSWER: B
EXPERT RATIONALE: National and local codes limit residential lawn sprinkler control
circuits to 24 volts AC for safety, typically from a Class 2 transformer.
QUESTION 6
Which backflow prevention device is commonly required for high-hazard applications
such as a sprinkler system with fertilizer injection?
A. Atmospheric vacuum breaker
B. Double check valve assembly
C. Reduced pressure zone assembly
D. Pressure vacuum breaker
CORRECT ANSWER: C
EXPERT RATIONALE: RPZ assemblies protect against backpressure and backsiphonage in
high-hazard conditions, whereas other devices may only protect against backsiphonage
or low hazards.
QUESTION 7
What is the primary purpose of a backflow prevention device in a lawn irrigation
system?
A. To increase water pressure to sprinkler heads
B. To filter debris from the municipal supply
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C. To prevent contamination of the potable water supply
D. To reduce water hammer in main lines
CORRECT ANSWER: C
EXPERT RATIONALE: Backflow preventers stop irrigation water, which may contain
fertilizers or bacteria, from flowing back into the drinking water supply.
QUESTION 8
An irrigation zone is calculated to require 14 GPM at 45 PSI. The static pressure is 65 PSI
and meter and service line losses total 7 PSI. If the backflow preventer loses 5 PSI at 14
GPM, what is the approximate remaining pressure for the zone?
A. 53 PSI
B. 45 PSI
C. 38 PSI
D. 60 PSI
CORRECT ANSWER: A
EXPERT RATIONALE: Static 65 PSI minus 7 PSI service loss and 5 PSI backflow loss leaves
53 PSI at the valve inlet; the zone requires 45 PSI so 53 PSI is available.
QUESTION 9
Friction loss in a sprinkler pipe increases most directly with which factor?
A. Pipe material color
B. Flow velocity and pipe length
C. Number of heads downstream
D. Ambient temperature
CORRECT ANSWER: B
EXPERT RATIONALE: Friction loss rises with higher velocity (flow rate) and longer pipe
runs, as described by the Hazen-Williams formula; length directly adds loss.
Connecticut (CT) J-4 Limited Lawn Sprinkler
Journeyperson Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple choice questions is designed for the Connecticut J-4
Limited Lawn Sprinkler Journeyperson Exam. The examination is a closed-book,
multiple-choice test that evaluates competency in core trade areas including hydraulics and
piping, system components, backflow prevention, low-voltage electrical, installation and
site conditions, applicable codes and regulations, and maintenance and troubleshooting.
The exam is administered by the Connecticut Department of Consumer Protection (DCP)
and PSI Services.
QUESTION 1
Which of the following best describes the scope of work permitted under a Connecticut
J-4 Limited Lawn Sprinkler Journeyperson license?
A. Installation of residential fire sprinkler systems
B. Design and installation of municipal water mains
C. Installation, repair, and maintenance of lawn sprinkler systems while employed by a
licensed plumbing or sprinkler contractor
D. Independent contracting for any irrigation work under $5,000
CORRECT ANSWER: C
EXPERT RATIONALE: The J-4 license explicitly allows installation, repair, and maintenance
of lawn sprinkler systems only when working under a properly licensed contractor; it
does not permit independent contracting.
QUESTION 2
To qualify for the Connecticut J-4 examination, how many hours of related instruction
must be completed in a registered apprenticeship program?
,2|Page
A. 72 hours
B. 100 hours
C. 144 hours
D. 200 hours
CORRECT ANSWER: C
EXPERT RATIONALE: A registered 1-year apprenticeship program requires 144 hours of
related instruction plus 2,000 hours of on-the-job training to sit for the exam.
QUESTION 3
What is the minimum required on-the-job training hours for the J-4 apprenticeship
pathway?
A. 1,000 hours
B. 1,500 hours
C. 2,000 hours
D. 4,000 hours
CORRECT ANSWER: C
EXPERT RATIONALE: The J-4 license requires completion of a program with 2,000 hours
of OJT, equating to one year of full-time practical experience.
QUESTION 4
The J-4 examination is administered by which entities?
A. Connecticut Department of Labor and PSI Services
B. Department of Consumer Protection and PSI Services
C. Connecticut Irrigation Association and Prometric
D. Department of Public Health and Pearson VUE
CORRECT ANSWER: B
EXPERT RATIONALE: The exam is jointly administered by the Department of Consumer
Protection (DCP) and PSI Services.
,3|Page
QUESTION 5
What is the maximum voltage allowed for low-voltage wiring in lawn sprinkler control
systems?
A. 12 volts
B. 24 volts
C. 30 volts
D. 48 volts
CORRECT ANSWER: B
EXPERT RATIONALE: National and local codes limit residential lawn sprinkler control
circuits to 24 volts AC for safety, typically from a Class 2 transformer.
QUESTION 6
Which backflow prevention device is commonly required for high-hazard applications
such as a sprinkler system with fertilizer injection?
A. Atmospheric vacuum breaker
B. Double check valve assembly
C. Reduced pressure zone assembly
D. Pressure vacuum breaker
CORRECT ANSWER: C
EXPERT RATIONALE: RPZ assemblies protect against backpressure and backsiphonage in
high-hazard conditions, whereas other devices may only protect against backsiphonage
or low hazards.
QUESTION 7
What is the primary purpose of a backflow prevention device in a lawn irrigation
system?
A. To increase water pressure to sprinkler heads
B. To filter debris from the municipal supply
, 4|Page
C. To prevent contamination of the potable water supply
D. To reduce water hammer in main lines
CORRECT ANSWER: C
EXPERT RATIONALE: Backflow preventers stop irrigation water, which may contain
fertilizers or bacteria, from flowing back into the drinking water supply.
QUESTION 8
An irrigation zone is calculated to require 14 GPM at 45 PSI. The static pressure is 65 PSI
and meter and service line losses total 7 PSI. If the backflow preventer loses 5 PSI at 14
GPM, what is the approximate remaining pressure for the zone?
A. 53 PSI
B. 45 PSI
C. 38 PSI
D. 60 PSI
CORRECT ANSWER: A
EXPERT RATIONALE: Static 65 PSI minus 7 PSI service loss and 5 PSI backflow loss leaves
53 PSI at the valve inlet; the zone requires 45 PSI so 53 PSI is available.
QUESTION 9
Friction loss in a sprinkler pipe increases most directly with which factor?
A. Pipe material color
B. Flow velocity and pipe length
C. Number of heads downstream
D. Ambient temperature
CORRECT ANSWER: B
EXPERT RATIONALE: Friction loss rises with higher velocity (flow rate) and longer pipe
runs, as described by the Hazen-Williams formula; length directly adds loss.
