ASNT NDT Level I-III Visual Testing (VT) - 150 Questions and
Answers with Detailed Rationales
About This Exam Bank
This comprehensive 150-question exam bank is designed to prepare candidates for ASNT NDT Level I-III Visual
Testing (VT). Every question is aligned with the latest official content outline and includes a detailed,
evidence-based rationale, an explanation of why each remaining option is incorrect, and a supporting reference.
Keywords
ASNT NDT Level I-III Visual Testing (VT), exam bank, practice questions, verified answers, detailed rationales, test
prep, study guide, review questions, certification exam, latest update, ASNT NDT Level I-III Visual Testing (VT),
exam bank, practice questions, verified answers, detailed rationales, ASNT NDT Level I-III Visual Testing (VT),
exam bank, practice questions, verified answers, detailed rationales, test prep, study guide, review questions, ASNT
NDT Level I-III Visual Testing (VT), exam bank, practice questions, verified answers, detailed rationales, test prep,
study guide, review questions, certification exam, latest update, ASNT NDT Level I-III Visual Testing (VT), exam
PART 1: APPLY RADIOMETRIC AND PHOTOMETRIC PRINCIPLES TO SELECT AND
VERIFY VT ILLUMINATION SYSTEMS THAT SATISFY CODE-REQUIRED MINIMUM
LIGHT LEVELS
1. A direct visual inspection of a stainless steel pressure vessel interior requires detecting a 0.5 mm incipient crack.
Which illumination condition is MOST appropriate?
A) Broad-spectrum white light at 1,000 lux with a 10° viewing angle
B) White light at 500 lux with a 30° viewing angle
C) Ultraviolet-A (365 nm) with a 5° viewing angle
D) Focused white light at 1,000 lux with a 45° viewing angle
' Correct Answer: D
Rationale: ASME Section V Article 9 requires a minimum of 1,000 lux (100 fc) at the inspection surface for
general visual examination, and a 45° viewing angle maximizes contrast for fine surface discontinuities. UV-A is
only appropriate with fluorescent penetrant, not direct visual. Lower lux or shallow angles reduce detectability of
tight cracks.
2. During a VT of a fillet weld on a pressure-retaining component, the inspector observes a linear indication at the
toe. Which supplementary NDT method is MOST likely to characterize its depth?
A) Liquid penetrant testing
B) Magnetic particle testing
C) Ultrasonic testing
D) Radiographic testing
' Correct Answer: C
Rationale: Ultrasonic testing is best suited for depth characterization of subsurface or toe cracks, especially in
ferritic welds. PT and MT detect surface/near-surface only, and RT is less reliable for planar, tight defects oriented
unfavorably. VT identifies the indication; UT quantifies its through-thickness extent.
3. A Level II VT inspector must develop a technique for inspecting a large, complex casting with limited
accessibility. Which document primarily governs the minimum requirements for the written procedure?
Page 1
, A) ASNT SNT-TC-1A (2020 edition)
B) ASME BPVC Section V, Article 9
C) AWS D1.1/D1.1M:2020
D) ASTM E165/E165M-18
' Correct Answer: B
Rationale: For ASME Code components, Section V Article 9 specifies mandatory VT procedure requirements
including illumination, resolution, and qualification. SNT-TC-1A provides personnel certification guidance, AWS
D1.1 governs structural welding, and ASTM E165 covers liquid penetrant-not visual procedure essentials.
4. Which factor MOST significantly reduces the reliability of remote visual inspection using a borescope on a 10 m
long, 50 mm diameter pipe?
A) Loss of depth perception and limited field of view
B) Insufficient illumination intensity at the far end
C) Optical distortion from the lens system
D) Vibration of the insertion tube
' Correct Answer: A
Rationale: The primary limitation of borescopic inspection is the loss of stereoscopic depth perception and
restricted field of view, which impairs defect sizing and location. Illumination can be compensated with high-output
sources, distortion is correctable, and vibration is a lesser concern with proper stabilization.
5. A VT inspector evaluates a weld with a 2 mm deep undercut. Per ASME Section VIII Div. 1, which condition
determines whether it is acceptable?
A) Undercut depth exceeding 0.5 mm is always rejectable
B) Undercut is acceptable if depth 0.8 mm or 10% of thickness, whichever is smaller
C) Undercut is acceptable if depth 1.0 mm regardless of thickness
D) Undercut is rejectable only if it exceeds 5% of the weld width
' Correct Answer: B
Rationale: ASME Section VIII Div. 1 UW-35 specifies undercut acceptance as depth not exceeding 0.8 mm (1/32
in.) or 10% of the plate thickness, whichever is smaller, for categories A and B welds. Options A, C, and D misstate
the code limits or reference irrelevant criteria.
6. Which of the following best describes the role of a Level III VT examiner in the qualification of a Level I
inspector?
A) Administering only the general examination
B) Approving the specific and practical examination content and evaluating results
C) Performing the practical examination as the sole evaluator
D) Delegating all qualification responsibilities to the Level II
' Correct Answer: B
Rationale: Per SNT-TC-1A, the Level III is responsible for developing and approving examination content,
including specific and practical exams, and for evaluating results to ensure the candidate meets certification
requirements. Level IIs may assist but cannot solely qualify. Option A is incomplete, C is too narrow, and D violates
certification authority.
7. During a visual inspection of a machined surface, a 0.2 mm deep scratch is observed. The applicable drawing
specifies a surface roughness of Ra 0.8 µm and no scratches deeper than 0.1 mm. What is the correct disposition?
A) Accept, as the scratch is less than 0.5 mm deep
B) Reject, as the scratch exceeds the drawing limit
C) Accept, provided the scratch does not affect fit or function
Page 2
, D) Reject only if the scratch is in a sealing area
' Correct Answer: B
Rationale: The drawing explicitly limits scratch depth to 0.1 mm; the observed 0.2 mm scratch exceeds this,
mandating rejection regardless of location or functional assessment. Options A, C, and D introduce criteria not
specified in the drawing, violating the hierarchy of requirements.
8. In accordance with ASNT CP-105 (2020), which topic is NOT required in a Level II VT training curriculum?
A) Fundamentals of visual testing
B) Lighting and equipment
C) Advanced radiographic interpretation
D) Procedure writing and acceptance criteria
' Correct Answer: C
Rationale: CP-105 outlines VT-specific topical outlines that include fundamentals, equipment, procedures, and
acceptance criteria, but radiographic interpretation belongs to the RT method. Including RT topics would be
inappropriate for a VT curriculum and outside the scope of VT certification.
9. An inspector uses a magnifying lens with a 2× magnification and a 50 mm focal length. What is the approximate
maximum working distance for a sharp image?
A) 25 mm
B) 50 mm
C) 100 mm
D) 200 mm
' Correct Answer: B
Rationale: For a simple magnifier, the focal length approximates the working distance for a focused image at the
near point. A 50 mm focal length corresponds to a 50 mm working distance. Options A, C, and D misapply the
relationship between magnification and focal length.
10. Which human factor most directly compromises the probability of detection (POD) during a prolonged visual
inspection of a large weldment?
A) Inspector's level of certification
B) Visual fatigue and vigilance decrement
C) Use of a calibrated light meter
D) Ambient temperature fluctuations
' Correct Answer: B
Rationale: Visual fatigue and the vigilance decrement are well-documented human factors that reduce attention and
detection reliability over time, independent of certification level. Certification ensures baseline competence, light
meters verify illumination, and temperature is a secondary environmental factor.
11. A Level II VT inspector views a smooth, machined aluminum surface under white light at 500 lux. The surface
has a matte finish with 40% diffuse reflectance. Which combination of illumination geometry and technique will
BEST reveal shallow, tight surface discontinuities?
A) Diffuse broad-beam illumination at 45° with a low-power magnifier
B) Directional white light at a low grazing angle (10°-15°) with a high-intensity source
C) Coaxial (axial) illumination aligned with the viewing axis
D) Ultraviolet-A illumination with a fluorescent penetrant applied to the surface
' Correct Answer: B
Rationale: Grazing-angle directional lighting casts shadows across shallow, tight discontinuities, maximizing
contrast and depth perception on smooth machined surfaces. Diffuse light reduces shadow formation, coaxial light
Page 3
, suppresses surface relief, and UV with penetrant is a separate PT method, not pure VT.
12. Per ASNT SNT-TC-1A (2024), which statement correctly describes the employer's Written Practice for VT
personnel certification?
A) It must be identical to ASNT's recommended practice without modification
B) It must be approved by ASNT's Certification Management Council before use
C) It defines training, experience, and examination requirements and is the employer's responsibility
D) It may only be revised when a new edition of CP-189 is published
' Correct Answer: C
Rationale: SNT-TC-1A is a recommended practice; the employer must develop and maintain a Written Practice
specifying training, experience, and examination criteria. ASNT does not approve employer Written Practices, and
CP-189 is a separate central certification program.
13. A welder produces a fillet weld with a concave profile and leg lengths of 6 mm and 8 mm. The theoretical throat
is 0.707 times the shorter leg. What is the effective throat, and what VT concern does the concave profile raise?
A) 4.24 mm; reduced load-carrying capacity due to insufficient throat
B) 5.66 mm; excessive convexity causing stress concentration
C) 4.24 mm; acceptable because concave profiles always meet code
D) 5.66 mm; undercut at the weld toe
' Correct Answer: A
Rationale: Theoretical throat = 0.707 × 6 mm = 4.24 mm. A concave profile further reduces the actual throat,
lowering load-carrying capacity and potentially violating minimum throat requirements. Convexity, not concavity,
causes stress concentration; undercut is a separate toe condition.
14. An inspector uses a borescope with a 0.5 mm diameter fiber bundle to examine the interior of a 12 mm
inner-diameter tube. The working distance is 40 mm. Which optical parameter MOST limits detection of a 0.1 mm
crack?
A) Depth of field at the chosen working distance
B) Field of view of the objective lens
C) Spatial resolution of the fiber bundle and lens system
D) Color temperature of the illumination source
' Correct Answer: C
Rationale: Spatial resolution, governed by fiber count, lens quality, and pixel density, determines the smallest
detectable feature. Depth of field and field of view affect focus and coverage but not the fundamental resolving limit;
color temperature affects contrast, not resolution.
15. During VT of a casting, a linear indication is observed on a machined surface. Which condition would MOST
likely be misinterpreted as a crack but is actually a surface artifact?
A) Hot tear
B) Cold shut
C) Machining lap or seam
D) Shrinkage porosity
' Correct Answer: C
Rationale: Machining laps or seams are linear surface artifacts that can mimic cracks in appearance and orientation.
Hot tears, cold shuts, and shrinkage porosity are casting discontinuities with different morphology and origin,
though they may also appear linear.
Page 4
Answers with Detailed Rationales
About This Exam Bank
This comprehensive 150-question exam bank is designed to prepare candidates for ASNT NDT Level I-III Visual
Testing (VT). Every question is aligned with the latest official content outline and includes a detailed,
evidence-based rationale, an explanation of why each remaining option is incorrect, and a supporting reference.
Keywords
ASNT NDT Level I-III Visual Testing (VT), exam bank, practice questions, verified answers, detailed rationales, test
prep, study guide, review questions, certification exam, latest update, ASNT NDT Level I-III Visual Testing (VT),
exam bank, practice questions, verified answers, detailed rationales, ASNT NDT Level I-III Visual Testing (VT),
exam bank, practice questions, verified answers, detailed rationales, test prep, study guide, review questions, ASNT
NDT Level I-III Visual Testing (VT), exam bank, practice questions, verified answers, detailed rationales, test prep,
study guide, review questions, certification exam, latest update, ASNT NDT Level I-III Visual Testing (VT), exam
PART 1: APPLY RADIOMETRIC AND PHOTOMETRIC PRINCIPLES TO SELECT AND
VERIFY VT ILLUMINATION SYSTEMS THAT SATISFY CODE-REQUIRED MINIMUM
LIGHT LEVELS
1. A direct visual inspection of a stainless steel pressure vessel interior requires detecting a 0.5 mm incipient crack.
Which illumination condition is MOST appropriate?
A) Broad-spectrum white light at 1,000 lux with a 10° viewing angle
B) White light at 500 lux with a 30° viewing angle
C) Ultraviolet-A (365 nm) with a 5° viewing angle
D) Focused white light at 1,000 lux with a 45° viewing angle
' Correct Answer: D
Rationale: ASME Section V Article 9 requires a minimum of 1,000 lux (100 fc) at the inspection surface for
general visual examination, and a 45° viewing angle maximizes contrast for fine surface discontinuities. UV-A is
only appropriate with fluorescent penetrant, not direct visual. Lower lux or shallow angles reduce detectability of
tight cracks.
2. During a VT of a fillet weld on a pressure-retaining component, the inspector observes a linear indication at the
toe. Which supplementary NDT method is MOST likely to characterize its depth?
A) Liquid penetrant testing
B) Magnetic particle testing
C) Ultrasonic testing
D) Radiographic testing
' Correct Answer: C
Rationale: Ultrasonic testing is best suited for depth characterization of subsurface or toe cracks, especially in
ferritic welds. PT and MT detect surface/near-surface only, and RT is less reliable for planar, tight defects oriented
unfavorably. VT identifies the indication; UT quantifies its through-thickness extent.
3. A Level II VT inspector must develop a technique for inspecting a large, complex casting with limited
accessibility. Which document primarily governs the minimum requirements for the written procedure?
Page 1
, A) ASNT SNT-TC-1A (2020 edition)
B) ASME BPVC Section V, Article 9
C) AWS D1.1/D1.1M:2020
D) ASTM E165/E165M-18
' Correct Answer: B
Rationale: For ASME Code components, Section V Article 9 specifies mandatory VT procedure requirements
including illumination, resolution, and qualification. SNT-TC-1A provides personnel certification guidance, AWS
D1.1 governs structural welding, and ASTM E165 covers liquid penetrant-not visual procedure essentials.
4. Which factor MOST significantly reduces the reliability of remote visual inspection using a borescope on a 10 m
long, 50 mm diameter pipe?
A) Loss of depth perception and limited field of view
B) Insufficient illumination intensity at the far end
C) Optical distortion from the lens system
D) Vibration of the insertion tube
' Correct Answer: A
Rationale: The primary limitation of borescopic inspection is the loss of stereoscopic depth perception and
restricted field of view, which impairs defect sizing and location. Illumination can be compensated with high-output
sources, distortion is correctable, and vibration is a lesser concern with proper stabilization.
5. A VT inspector evaluates a weld with a 2 mm deep undercut. Per ASME Section VIII Div. 1, which condition
determines whether it is acceptable?
A) Undercut depth exceeding 0.5 mm is always rejectable
B) Undercut is acceptable if depth 0.8 mm or 10% of thickness, whichever is smaller
C) Undercut is acceptable if depth 1.0 mm regardless of thickness
D) Undercut is rejectable only if it exceeds 5% of the weld width
' Correct Answer: B
Rationale: ASME Section VIII Div. 1 UW-35 specifies undercut acceptance as depth not exceeding 0.8 mm (1/32
in.) or 10% of the plate thickness, whichever is smaller, for categories A and B welds. Options A, C, and D misstate
the code limits or reference irrelevant criteria.
6. Which of the following best describes the role of a Level III VT examiner in the qualification of a Level I
inspector?
A) Administering only the general examination
B) Approving the specific and practical examination content and evaluating results
C) Performing the practical examination as the sole evaluator
D) Delegating all qualification responsibilities to the Level II
' Correct Answer: B
Rationale: Per SNT-TC-1A, the Level III is responsible for developing and approving examination content,
including specific and practical exams, and for evaluating results to ensure the candidate meets certification
requirements. Level IIs may assist but cannot solely qualify. Option A is incomplete, C is too narrow, and D violates
certification authority.
7. During a visual inspection of a machined surface, a 0.2 mm deep scratch is observed. The applicable drawing
specifies a surface roughness of Ra 0.8 µm and no scratches deeper than 0.1 mm. What is the correct disposition?
A) Accept, as the scratch is less than 0.5 mm deep
B) Reject, as the scratch exceeds the drawing limit
C) Accept, provided the scratch does not affect fit or function
Page 2
, D) Reject only if the scratch is in a sealing area
' Correct Answer: B
Rationale: The drawing explicitly limits scratch depth to 0.1 mm; the observed 0.2 mm scratch exceeds this,
mandating rejection regardless of location or functional assessment. Options A, C, and D introduce criteria not
specified in the drawing, violating the hierarchy of requirements.
8. In accordance with ASNT CP-105 (2020), which topic is NOT required in a Level II VT training curriculum?
A) Fundamentals of visual testing
B) Lighting and equipment
C) Advanced radiographic interpretation
D) Procedure writing and acceptance criteria
' Correct Answer: C
Rationale: CP-105 outlines VT-specific topical outlines that include fundamentals, equipment, procedures, and
acceptance criteria, but radiographic interpretation belongs to the RT method. Including RT topics would be
inappropriate for a VT curriculum and outside the scope of VT certification.
9. An inspector uses a magnifying lens with a 2× magnification and a 50 mm focal length. What is the approximate
maximum working distance for a sharp image?
A) 25 mm
B) 50 mm
C) 100 mm
D) 200 mm
' Correct Answer: B
Rationale: For a simple magnifier, the focal length approximates the working distance for a focused image at the
near point. A 50 mm focal length corresponds to a 50 mm working distance. Options A, C, and D misapply the
relationship between magnification and focal length.
10. Which human factor most directly compromises the probability of detection (POD) during a prolonged visual
inspection of a large weldment?
A) Inspector's level of certification
B) Visual fatigue and vigilance decrement
C) Use of a calibrated light meter
D) Ambient temperature fluctuations
' Correct Answer: B
Rationale: Visual fatigue and the vigilance decrement are well-documented human factors that reduce attention and
detection reliability over time, independent of certification level. Certification ensures baseline competence, light
meters verify illumination, and temperature is a secondary environmental factor.
11. A Level II VT inspector views a smooth, machined aluminum surface under white light at 500 lux. The surface
has a matte finish with 40% diffuse reflectance. Which combination of illumination geometry and technique will
BEST reveal shallow, tight surface discontinuities?
A) Diffuse broad-beam illumination at 45° with a low-power magnifier
B) Directional white light at a low grazing angle (10°-15°) with a high-intensity source
C) Coaxial (axial) illumination aligned with the viewing axis
D) Ultraviolet-A illumination with a fluorescent penetrant applied to the surface
' Correct Answer: B
Rationale: Grazing-angle directional lighting casts shadows across shallow, tight discontinuities, maximizing
contrast and depth perception on smooth machined surfaces. Diffuse light reduces shadow formation, coaxial light
Page 3
, suppresses surface relief, and UV with penetrant is a separate PT method, not pure VT.
12. Per ASNT SNT-TC-1A (2024), which statement correctly describes the employer's Written Practice for VT
personnel certification?
A) It must be identical to ASNT's recommended practice without modification
B) It must be approved by ASNT's Certification Management Council before use
C) It defines training, experience, and examination requirements and is the employer's responsibility
D) It may only be revised when a new edition of CP-189 is published
' Correct Answer: C
Rationale: SNT-TC-1A is a recommended practice; the employer must develop and maintain a Written Practice
specifying training, experience, and examination criteria. ASNT does not approve employer Written Practices, and
CP-189 is a separate central certification program.
13. A welder produces a fillet weld with a concave profile and leg lengths of 6 mm and 8 mm. The theoretical throat
is 0.707 times the shorter leg. What is the effective throat, and what VT concern does the concave profile raise?
A) 4.24 mm; reduced load-carrying capacity due to insufficient throat
B) 5.66 mm; excessive convexity causing stress concentration
C) 4.24 mm; acceptable because concave profiles always meet code
D) 5.66 mm; undercut at the weld toe
' Correct Answer: A
Rationale: Theoretical throat = 0.707 × 6 mm = 4.24 mm. A concave profile further reduces the actual throat,
lowering load-carrying capacity and potentially violating minimum throat requirements. Convexity, not concavity,
causes stress concentration; undercut is a separate toe condition.
14. An inspector uses a borescope with a 0.5 mm diameter fiber bundle to examine the interior of a 12 mm
inner-diameter tube. The working distance is 40 mm. Which optical parameter MOST limits detection of a 0.1 mm
crack?
A) Depth of field at the chosen working distance
B) Field of view of the objective lens
C) Spatial resolution of the fiber bundle and lens system
D) Color temperature of the illumination source
' Correct Answer: C
Rationale: Spatial resolution, governed by fiber count, lens quality, and pixel density, determines the smallest
detectable feature. Depth of field and field of view affect focus and coverage but not the fundamental resolving limit;
color temperature affects contrast, not resolution.
15. During VT of a casting, a linear indication is observed on a machined surface. Which condition would MOST
likely be misinterpreted as a crack but is actually a surface artifact?
A) Hot tear
B) Cold shut
C) Machining lap or seam
D) Shrinkage porosity
' Correct Answer: C
Rationale: Machining laps or seams are linear surface artifacts that can mimic cracks in appearance and orientation.
Hot tears, cold shuts, and shrinkage porosity are casting discontinuities with different morphology and origin,
though they may also appear linear.
Page 4
