NEVADA C-1 PLUMBING AND HEATING
LICENSING EXAM QUESTIONS AND
VERIFIED ANSWERS JUST RELEASED.
1. According to the Uniform Plumbing Code (UPC), what is the maximum distance for a 2-inch
trap arm?
A. 5 feet
B. 3 feet
C. 6 feet
D. 8 feet
Answer: A
Conceptual Explanation: For a 2-inch pipe, the maximum length of the trap arm is 5 feet
to prevent siphoning and ensure proper venting.
2. In a fuel gas system, what is the minimum required pressure test duration for a residential
installation?
A. 10 minutes
B. 5 minutes
C. 15 minutes
D. 30 minutes
,Answer: A
Conceptual Explanation: Standard codes require a minimum of 10 minutes at no less than
1.5 times the working pressure, or 3 psi, whichever is greater.
3. What is the minimum burial depth for a gas piping system installed underground outdoors?
A. 6 inches
B. 24 inches
C. 18 inches
D. 12 inches
Answer: D
Conceptual Explanation: The code typically requires a minimum of 12 inches of cover for
underground gas piping to protect it from mechanical damage.
4. Which backflow prevention device is required for a high-hazard cross-connection where
backpressure may exist?
A. Reduced Pressure Principle Backflow Preventer (RP)
B. Double Check Valve Assembly (DC)
C. Atmospheric Vacuum Breaker (AVB)
D. Pressure Vacuum Breaker (PVB)
Answer: A
, Conceptual Explanation: The RP assembly is the only mechanical device suitable for high-
hazard applications involving both backpressure and backsiphonage.
5. For a 4-inch horizontal drainage pipe, what is the minimum slope per foot required by
code?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
D. 1/2 inch
Answer: B
Conceptual Explanation: While smaller pipes require 1/4 inch per foot, 4-inch or larger
pipes may be sloped at 1/8 inch per foot with administrative approval.
6. What is the maximum number of Drainage Fixture Units (DFUs) allowed on a 3-inch
horizontal branch?
A. 20 DFUs
B. 35 DFUs
C. 42 DFUs
D. 60 DFUs
Answer: C
LICENSING EXAM QUESTIONS AND
VERIFIED ANSWERS JUST RELEASED.
1. According to the Uniform Plumbing Code (UPC), what is the maximum distance for a 2-inch
trap arm?
A. 5 feet
B. 3 feet
C. 6 feet
D. 8 feet
Answer: A
Conceptual Explanation: For a 2-inch pipe, the maximum length of the trap arm is 5 feet
to prevent siphoning and ensure proper venting.
2. In a fuel gas system, what is the minimum required pressure test duration for a residential
installation?
A. 10 minutes
B. 5 minutes
C. 15 minutes
D. 30 minutes
,Answer: A
Conceptual Explanation: Standard codes require a minimum of 10 minutes at no less than
1.5 times the working pressure, or 3 psi, whichever is greater.
3. What is the minimum burial depth for a gas piping system installed underground outdoors?
A. 6 inches
B. 24 inches
C. 18 inches
D. 12 inches
Answer: D
Conceptual Explanation: The code typically requires a minimum of 12 inches of cover for
underground gas piping to protect it from mechanical damage.
4. Which backflow prevention device is required for a high-hazard cross-connection where
backpressure may exist?
A. Reduced Pressure Principle Backflow Preventer (RP)
B. Double Check Valve Assembly (DC)
C. Atmospheric Vacuum Breaker (AVB)
D. Pressure Vacuum Breaker (PVB)
Answer: A
, Conceptual Explanation: The RP assembly is the only mechanical device suitable for high-
hazard applications involving both backpressure and backsiphonage.
5. For a 4-inch horizontal drainage pipe, what is the minimum slope per foot required by
code?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
D. 1/2 inch
Answer: B
Conceptual Explanation: While smaller pipes require 1/4 inch per foot, 4-inch or larger
pipes may be sloped at 1/8 inch per foot with administrative approval.
6. What is the maximum number of Drainage Fixture Units (DFUs) allowed on a 3-inch
horizontal branch?
A. 20 DFUs
B. 35 DFUs
C. 42 DFUs
D. 60 DFUs
Answer: C
