National Board Inservice Inspector (NB-IS)
Certification Exam with Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What is the primary purpose of the NB-IS certification?
A. Design pressure vessels
B. Manufacture boilers
C. Inspect pressure-retaining items in service
D. Sell inspection equipment
Answer: C
Rationale: NB-IS certification focuses on inservice inspection of
boilers and pressure vessels.
2. Which code is most closely associated with NB-IS inspections?
A. ASME Section I
B. ASME Section VIII
C. NBIC
D. API 510
Answer: C
Rationale: The National Board Inspection Code (NBIC) governs
inservice inspection, repairs, and alterations.
,3. What does NBIC stand for?
A. National Boiler Installation Code
B. National Board Inspection Code
C. National Boiler Inspection Committee
D. National Board Installation Criteria
Answer: B
Rationale: NBIC stands for National Board Inspection Code.
4. What is the main focus of NBIC Part 2?
A. Repairs and alterations
B. Inspection
C. Installation
D. Design
Answer: B
Rationale: NBIC Part 2 covers inspection of pressure-retaining
items.
5. A pressure relief valve should be tested at what interval typically?
A. Every month
B. Every 10 years
C. At regular intervals based on service
D. Never
Answer: C
Rationale: Testing frequency depends on service conditions and
jurisdiction.
,6. What is MAWP?
A. Maximum Allowable Working Pressure
B. Minimum Allowed Working Pressure
C. Maximum Applied Water Pressure
D. Mechanical Allowable Working Parameter
Answer: A
Rationale: MAWP is the maximum pressure allowed for safe
operation.
7. Corrosion allowance is:
A. Extra thickness for painting
B. Thickness for corrosion loss over time
C. Welding reinforcement
D. Design error
Answer: B
Rationale: It compensates for expected material loss due to
corrosion.
8. Who is responsible for ensuring inspections are performed?
A. Manufacturer
B. Owner/User
C. Inspector only
D. Government only
Answer: B
Rationale: The owner/user holds responsibility for maintaining
safe operation.
, 9. What type of inspection is performed while equipment is
operating?
A. Internal
B. External
C. Hydrostatic
D. Radiographic
Answer: B
Rationale: External inspections are conducted during operation.
10. Internal inspections require:
A. Equipment shutdown
B. High pressure
C. Continuous operation
D. Welding
Answer: A
Rationale: Internal inspection requires shutdown and access.
11. A hydrostatic test uses:
A. Air
B. Steam
C. Water
D. Oil
Answer: C
Rationale: Hydrostatic testing uses water to pressurize the
system safely.
Certification Exam with Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of the NB-IS certification?
A. Design pressure vessels
B. Manufacture boilers
C. Inspect pressure-retaining items in service
D. Sell inspection equipment
Answer: C
Rationale: NB-IS certification focuses on inservice inspection of
boilers and pressure vessels.
2. Which code is most closely associated with NB-IS inspections?
A. ASME Section I
B. ASME Section VIII
C. NBIC
D. API 510
Answer: C
Rationale: The National Board Inspection Code (NBIC) governs
inservice inspection, repairs, and alterations.
,3. What does NBIC stand for?
A. National Boiler Installation Code
B. National Board Inspection Code
C. National Boiler Inspection Committee
D. National Board Installation Criteria
Answer: B
Rationale: NBIC stands for National Board Inspection Code.
4. What is the main focus of NBIC Part 2?
A. Repairs and alterations
B. Inspection
C. Installation
D. Design
Answer: B
Rationale: NBIC Part 2 covers inspection of pressure-retaining
items.
5. A pressure relief valve should be tested at what interval typically?
A. Every month
B. Every 10 years
C. At regular intervals based on service
D. Never
Answer: C
Rationale: Testing frequency depends on service conditions and
jurisdiction.
,6. What is MAWP?
A. Maximum Allowable Working Pressure
B. Minimum Allowed Working Pressure
C. Maximum Applied Water Pressure
D. Mechanical Allowable Working Parameter
Answer: A
Rationale: MAWP is the maximum pressure allowed for safe
operation.
7. Corrosion allowance is:
A. Extra thickness for painting
B. Thickness for corrosion loss over time
C. Welding reinforcement
D. Design error
Answer: B
Rationale: It compensates for expected material loss due to
corrosion.
8. Who is responsible for ensuring inspections are performed?
A. Manufacturer
B. Owner/User
C. Inspector only
D. Government only
Answer: B
Rationale: The owner/user holds responsibility for maintaining
safe operation.
, 9. What type of inspection is performed while equipment is
operating?
A. Internal
B. External
C. Hydrostatic
D. Radiographic
Answer: B
Rationale: External inspections are conducted during operation.
10. Internal inspections require:
A. Equipment shutdown
B. High pressure
C. Continuous operation
D. Welding
Answer: A
Rationale: Internal inspection requires shutdown and access.
11. A hydrostatic test uses:
A. Air
B. Steam
C. Water
D. Oil
Answer: C
Rationale: Hydrostatic testing uses water to pressurize the
system safely.
