NATIONAL BOARD INSERVICE
INSPECTOR (NB-IS) CERTIFICATION
EXAM QUESTION AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A INSTANT
DOWNLOAD PDF
1. Which organization publishes the National Board Inspection Code (NBIC)?
A. ASME
B. API
C. National Board of Boiler and Pressure Vessel Inspectors
D. ASTM
Answer: National Board of Boiler and Pressure Vessel Inspectors
Rationale: The NBIC is developed and maintained by the National Board,
not ASME or API.
2. The NB-IS certification primarily applies to inspectors working on:
A. Piping systems only
B. Pressure vessels only
C. Boilers only
D. Boilers and pressure-retaining items under an owner-user program
Answer: Boilers and pressure-retaining items under an owner-user
program
Rationale: NB-IS focuses on inservice inspection within owner-user
jurisdictions.
3. Which document provides rules for inspection, repair, and alteration after
installation?
A. ASME Section I
, B. ASME Section VIII
C. NBIC
D. API 510
Answer: NBIC
Rationale: The NBIC governs post-installation inspection and repairs.
4. Who has the authority to stop operation of an unsafe boiler?
A. Manufacturer
B. Operator
C. Authorized Inspector
D. Maintenance supervisor
Answer: Authorized Inspector
Rationale: Authorized Inspectors are empowered to enforce safety
requirements.
5. A safety valve set pressure shall not exceed the MAWP by more than:
A. 3%
B. 6%
C. 10%
D. 16%
Answer: 6%
Rationale: ASME and NBIC limit overpressure to 6% for safety valves.
6. MAWP stands for:
A. Maximum Allowable Working Pressure
B. Maximum Allowable Working Pressure
C. Minimum Allowable Working Pressure
D. Maximum Actual Working Pressure
Answer: Maximum Allowable Working Pressure
Rationale: MAWP is the highest pressure permitted at the top of the
vessel.
7. Which inspection is performed while equipment is operating?
A. Internal inspection
B. External inspection
C. Hydrostatic test
D. Repair inspection
, Answer: External inspection
Rationale: External inspections can be done while in service.
8. The primary purpose of a hydrostatic test is to:
A. Detect corrosion
B. Measure thickness
C. Verify pressure integrity
D. Set safety valves
Answer: Verify pressure integrity
Rationale: Hydrotests confirm structural integrity under pressure.
9. Who issues the inspection certificate?
A. Owner
B. Manufacturer
C. Jurisdiction or Authorized Inspector
D. Repair organization
Answer: Jurisdiction or Authorized Inspector
Rationale: Certificates are issued by or under authority of the jurisdiction.
10.A boiler that cannot be internally inspected may require:
A. Visual inspection only
B. Hydrostatic test
C. Radiography
D. No inspection
Answer: Hydrostatic test
Rationale: Hydrostatic testing compensates for lack of internal access.
11.Which ASME section covers power boilers?
A. Section IV
B. Section VIII
C. Section I
D. Section X
Answer: Section I
Rationale: ASME Section I governs power boilers.
INSPECTOR (NB-IS) CERTIFICATION
EXAM QUESTION AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A INSTANT
DOWNLOAD PDF
1. Which organization publishes the National Board Inspection Code (NBIC)?
A. ASME
B. API
C. National Board of Boiler and Pressure Vessel Inspectors
D. ASTM
Answer: National Board of Boiler and Pressure Vessel Inspectors
Rationale: The NBIC is developed and maintained by the National Board,
not ASME or API.
2. The NB-IS certification primarily applies to inspectors working on:
A. Piping systems only
B. Pressure vessels only
C. Boilers only
D. Boilers and pressure-retaining items under an owner-user program
Answer: Boilers and pressure-retaining items under an owner-user
program
Rationale: NB-IS focuses on inservice inspection within owner-user
jurisdictions.
3. Which document provides rules for inspection, repair, and alteration after
installation?
A. ASME Section I
, B. ASME Section VIII
C. NBIC
D. API 510
Answer: NBIC
Rationale: The NBIC governs post-installation inspection and repairs.
4. Who has the authority to stop operation of an unsafe boiler?
A. Manufacturer
B. Operator
C. Authorized Inspector
D. Maintenance supervisor
Answer: Authorized Inspector
Rationale: Authorized Inspectors are empowered to enforce safety
requirements.
5. A safety valve set pressure shall not exceed the MAWP by more than:
A. 3%
B. 6%
C. 10%
D. 16%
Answer: 6%
Rationale: ASME and NBIC limit overpressure to 6% for safety valves.
6. MAWP stands for:
A. Maximum Allowable Working Pressure
B. Maximum Allowable Working Pressure
C. Minimum Allowable Working Pressure
D. Maximum Actual Working Pressure
Answer: Maximum Allowable Working Pressure
Rationale: MAWP is the highest pressure permitted at the top of the
vessel.
7. Which inspection is performed while equipment is operating?
A. Internal inspection
B. External inspection
C. Hydrostatic test
D. Repair inspection
, Answer: External inspection
Rationale: External inspections can be done while in service.
8. The primary purpose of a hydrostatic test is to:
A. Detect corrosion
B. Measure thickness
C. Verify pressure integrity
D. Set safety valves
Answer: Verify pressure integrity
Rationale: Hydrotests confirm structural integrity under pressure.
9. Who issues the inspection certificate?
A. Owner
B. Manufacturer
C. Jurisdiction or Authorized Inspector
D. Repair organization
Answer: Jurisdiction or Authorized Inspector
Rationale: Certificates are issued by or under authority of the jurisdiction.
10.A boiler that cannot be internally inspected may require:
A. Visual inspection only
B. Hydrostatic test
C. Radiography
D. No inspection
Answer: Hydrostatic test
Rationale: Hydrostatic testing compensates for lack of internal access.
11.Which ASME section covers power boilers?
A. Section IV
B. Section VIII
C. Section I
D. Section X
Answer: Section I
Rationale: ASME Section I governs power boilers.
