CO Industrial Piping Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a pipe support in an industrial piping
system?
A. To increase fluid velocity
B. To prevent corrosion
C. To carry the weight of the pipe and its contents
D. To regulate pressure
Rationale: Pipe supports are designed to carry the weight of the piping
system and its contents, maintaining alignment and preventing undue
stress.
2. Which material is most commonly used for high-pressure steam
piping?
A. PVC
B. Carbon steel
C. Copper
D. HDPE
Rationale: Carbon steel is preferred for high-pressure steam systems
due to its strength and temperature tolerance.
3. What is the purpose of an expansion loop in piping?
A. To filter debris
B. To measure flow
C. To accommodate thermal expansion and contraction
D. To increase flow velocity
Rationale: Expansion loops are installed to absorb thermal movement
and prevent excessive stress on the system.
,4. Which type of valve is most suitable for throttling flow?
A. Ball valve
B. Gate valve
C. Globe valve
D. Check valve
Rationale: Globe valves are designed for flow regulation and
throttling due to their precise disc movement.
5. What does ANSI stand for in piping standards?
A. American National Safety Institute
B. American National Standards Institute
C. Association of National Steel Industries
D. American National Steam Institute
Rationale: ANSI develops and oversees standards to ensure safety,
quality, and uniformity in piping systems.
6. What is the main reason for using flanged joints in piping?
A. To increase fluid velocity
B. To allow easy assembly and disassembly
C. To prevent thermal expansion
D. To reduce corrosion
Rationale: Flanged joints allow sections of piping to be connected or
removed easily for maintenance or inspection.
7. What type of corrosion occurs due to contact between dissimilar
metals?
A. Uniform corrosion
B. Pitting corrosion
C. Galvanic corrosion
D. Crevice corrosion
Rationale: Galvanic corrosion occurs when two dissimilar metals are
electrically connected in the presence of an electrolyte.
8. Which pipe fitting is used to change the direction of flow by 90
degrees?
A. Coupling
B. Elbow
C. Tee
D. Reducer
Rationale: Elbows are used to change the direction of the piping
system, commonly 45° or 90°.
, 9. What is the purpose of a strainers in piping systems?
A. To reduce pressure
B. To remove debris and protect equipment
C. To increase flow
D. To prevent thermal expansion
Rationale: Strainers filter out debris and prevent damage to pumps,
valves, and other equipment.
10. Which of the following is a standard schedule for pipe wall
thickness?
A. Schedule 5
B. Schedule 40
C. Schedule 1000
D. Schedule X
Rationale: Schedule numbers indicate the wall thickness of pipes;
Schedule 40 is standard for many industrial applications.
11. What is the function of a check valve?
A. To throttle flow
B. To prevent backflow
C. To measure pressure
D. To relieve pressure
Rationale: Check valves allow flow in one direction only, preventing
reverse flow in the system.
12. Which welding process is most common for industrial carbon
steel piping?
A. TIG welding
B. MIG welding
C. SMAW (Stick welding)
D. Laser welding
Rationale: SMAW is widely used for industrial piping because of its
versatility and ability to weld thick materials.
13. What is the minimum pipe slope recommended for horizontal
drainage piping?
A. 1%
B. 2%
C. 5%
D. 10%
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a pipe support in an industrial piping
system?
A. To increase fluid velocity
B. To prevent corrosion
C. To carry the weight of the pipe and its contents
D. To regulate pressure
Rationale: Pipe supports are designed to carry the weight of the piping
system and its contents, maintaining alignment and preventing undue
stress.
2. Which material is most commonly used for high-pressure steam
piping?
A. PVC
B. Carbon steel
C. Copper
D. HDPE
Rationale: Carbon steel is preferred for high-pressure steam systems
due to its strength and temperature tolerance.
3. What is the purpose of an expansion loop in piping?
A. To filter debris
B. To measure flow
C. To accommodate thermal expansion and contraction
D. To increase flow velocity
Rationale: Expansion loops are installed to absorb thermal movement
and prevent excessive stress on the system.
,4. Which type of valve is most suitable for throttling flow?
A. Ball valve
B. Gate valve
C. Globe valve
D. Check valve
Rationale: Globe valves are designed for flow regulation and
throttling due to their precise disc movement.
5. What does ANSI stand for in piping standards?
A. American National Safety Institute
B. American National Standards Institute
C. Association of National Steel Industries
D. American National Steam Institute
Rationale: ANSI develops and oversees standards to ensure safety,
quality, and uniformity in piping systems.
6. What is the main reason for using flanged joints in piping?
A. To increase fluid velocity
B. To allow easy assembly and disassembly
C. To prevent thermal expansion
D. To reduce corrosion
Rationale: Flanged joints allow sections of piping to be connected or
removed easily for maintenance or inspection.
7. What type of corrosion occurs due to contact between dissimilar
metals?
A. Uniform corrosion
B. Pitting corrosion
C. Galvanic corrosion
D. Crevice corrosion
Rationale: Galvanic corrosion occurs when two dissimilar metals are
electrically connected in the presence of an electrolyte.
8. Which pipe fitting is used to change the direction of flow by 90
degrees?
A. Coupling
B. Elbow
C. Tee
D. Reducer
Rationale: Elbows are used to change the direction of the piping
system, commonly 45° or 90°.
, 9. What is the purpose of a strainers in piping systems?
A. To reduce pressure
B. To remove debris and protect equipment
C. To increase flow
D. To prevent thermal expansion
Rationale: Strainers filter out debris and prevent damage to pumps,
valves, and other equipment.
10. Which of the following is a standard schedule for pipe wall
thickness?
A. Schedule 5
B. Schedule 40
C. Schedule 1000
D. Schedule X
Rationale: Schedule numbers indicate the wall thickness of pipes;
Schedule 40 is standard for many industrial applications.
11. What is the function of a check valve?
A. To throttle flow
B. To prevent backflow
C. To measure pressure
D. To relieve pressure
Rationale: Check valves allow flow in one direction only, preventing
reverse flow in the system.
12. Which welding process is most common for industrial carbon
steel piping?
A. TIG welding
B. MIG welding
C. SMAW (Stick welding)
D. Laser welding
Rationale: SMAW is widely used for industrial piping because of its
versatility and ability to weld thick materials.
13. What is the minimum pipe slope recommended for horizontal
drainage piping?
A. 1%
B. 2%
C. 5%
D. 10%
