AZ L-76 Industrial Piping Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of an expansion loop in an industrial
piping system?
A. To increase pipe flow velocity
B. To reduce friction losses
C. To absorb thermal expansion
D. To improve pipe insulation
Thermal expansion causes piping to grow in length; loops absorb this
movement and prevent stress on the system.
2. According to ASME B31.3, which material is commonly used for high-
temperature industrial piping?
A. PVC
B. Carbon steel
C. PEX
D. Copper
Carbon steel is widely used for high-temperature and high-pressure
industrial service under B31.3.
3. Which type of valve provides the most precise flow throttling control?
,A. Gate valve
B. Ball valve
C. Globe valve
D. Butterfly valve
Globe valves are designed for accurate throttling due to their linear flow
characteristics.
4. What does NPS stand for in piping terminology?
A. Nominal Pipe Scale
B. Nominal Pipe Size
C. Normal Pressure Setting
D. Normal Pipe Specification
NPS refers to a standardized nominal pipe size used in industrial piping.
5. What is the primary purpose of a pipe flange?
A. To seal pipe insulation
B. To allow disassembly and connection of piping sections
C. To restrict pipe movement
D. To reduce vibration
Flanges provide a removable bolted connection between pipe sections.
6. In industrial piping, a P&ID primarily shows:
A. Pipe insulation details
B. Pipe colors and labeling
C. Process flow and instrumentation
D. Structural supports
P&IDs depict equipment, piping, and instrumentation relationships.
, 7. Which weld test checks internal imperfections using high-frequency
sound waves?
A. Magnetic particle
B. Radiographic
C. Ultrasonic
D. Dye penetrant
Ultrasonic testing uses high-frequency sound to detect internal material
defects.
8. A 90° elbow changes piping direction by:
A. 30 degrees
B. 45 degrees
C. 90 degrees
D. 180 degrees
A 90° elbow turns the pipe exactly 90 degrees.
9. The main advantage of a ball valve is:
A. Throttling accuracy
B. Quick shutoff
C. Vacuum sealing
D. Temperature monitoring
Ball valves provide fast, quarter-turn shutoff.
10. Which code governs power piping?
A. ASME B31.3
B. ASME B31.8
C. ASME B31.1
D. ASME B31.9
ASME B31.1 applies to power piping related to boilers and power plants.
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of an expansion loop in an industrial
piping system?
A. To increase pipe flow velocity
B. To reduce friction losses
C. To absorb thermal expansion
D. To improve pipe insulation
Thermal expansion causes piping to grow in length; loops absorb this
movement and prevent stress on the system.
2. According to ASME B31.3, which material is commonly used for high-
temperature industrial piping?
A. PVC
B. Carbon steel
C. PEX
D. Copper
Carbon steel is widely used for high-temperature and high-pressure
industrial service under B31.3.
3. Which type of valve provides the most precise flow throttling control?
,A. Gate valve
B. Ball valve
C. Globe valve
D. Butterfly valve
Globe valves are designed for accurate throttling due to their linear flow
characteristics.
4. What does NPS stand for in piping terminology?
A. Nominal Pipe Scale
B. Nominal Pipe Size
C. Normal Pressure Setting
D. Normal Pipe Specification
NPS refers to a standardized nominal pipe size used in industrial piping.
5. What is the primary purpose of a pipe flange?
A. To seal pipe insulation
B. To allow disassembly and connection of piping sections
C. To restrict pipe movement
D. To reduce vibration
Flanges provide a removable bolted connection between pipe sections.
6. In industrial piping, a P&ID primarily shows:
A. Pipe insulation details
B. Pipe colors and labeling
C. Process flow and instrumentation
D. Structural supports
P&IDs depict equipment, piping, and instrumentation relationships.
, 7. Which weld test checks internal imperfections using high-frequency
sound waves?
A. Magnetic particle
B. Radiographic
C. Ultrasonic
D. Dye penetrant
Ultrasonic testing uses high-frequency sound to detect internal material
defects.
8. A 90° elbow changes piping direction by:
A. 30 degrees
B. 45 degrees
C. 90 degrees
D. 180 degrees
A 90° elbow turns the pipe exactly 90 degrees.
9. The main advantage of a ball valve is:
A. Throttling accuracy
B. Quick shutoff
C. Vacuum sealing
D. Temperature monitoring
Ball valves provide fast, quarter-turn shutoff.
10. Which code governs power piping?
A. ASME B31.3
B. ASME B31.8
C. ASME B31.1
D. ASME B31.9
ASME B31.1 applies to power piping related to boilers and power plants.
