ASNT NDT Level III Visual Testing (VT)
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1. The primary purpose of Visual Testing (VT) is to:
A. Measure internal material density
B. Detect surface and near-surface discontinuities
C. Determine chemical composition
D. Measure hardness
Answer: B
Rationale: Visual Testing is used to detect surface and near-surface
discontinuities such as cracks, corrosion, and misalignment using direct or
indirect visual means.
, 2. Which of the following is considered an indirect visual testing method?
A. Naked eye inspection
B. Mirror inspection
C. Use of borescopes
D. Magnifying glass
Answer: C
Rationale: Indirect VT uses optical aids such as borescopes or videoscopes
when direct line-of-sight is not possible.
3. According to ASNT standards, the minimum recommended light
intensity for general visual examination is:
A. 50 lux
B. 100 lux
C. 500 lux
D. 1000 lux
Answer: C
Rationale: ASNT and many codes specify a minimum of 500 lux (50 foot-
candles) for general visual examinations.
4. Visual acuity for VT personnel is commonly evaluated using which
test?
A. Ishihara test
, B. Jaeger chart
C. Snellen chart
D. Farnsworth D-15
Answer: C
Rationale: The Snellen chart is used to evaluate distance vision, a key
requirement for VT personnel.
5. The Ishihara test is primarily used to assess:
A. Depth perception
B. Near vision acuity
C. Color vision
D. Contrast sensitivity
Answer: C
Rationale: The Ishihara plates are designed to detect color vision
deficiencies.
6. Which discontinuity is BEST detected using Visual Testing?
A. Subsurface porosity
B. Internal shrinkage
C. Surface cracks
D. Laminations deep within material
, Answer: C
Rationale: VT is most effective for detecting surface-breaking
discontinuities such as cracks.
7. Magnification used during visual testing should generally not exceed:
A. 2X
B. 5X
C. 10X
D. 20X
Answer: B
Rationale: Excessive magnification can be misleading; most standards
recommend magnification not exceeding 5X for VT.
8. Which of the following is NOT a limitation of Visual Testing?
A. Requires surface accessibility
B. Limited to surface flaws
C. Can detect internal defects
D. Dependent on inspector skill
Answer: C
Rationale: VT cannot detect internal defects; this is not a limitation but an
incorrect capability.
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. The primary purpose of Visual Testing (VT) is to:
A. Measure internal material density
B. Detect surface and near-surface discontinuities
C. Determine chemical composition
D. Measure hardness
Answer: B
Rationale: Visual Testing is used to detect surface and near-surface
discontinuities such as cracks, corrosion, and misalignment using direct or
indirect visual means.
, 2. Which of the following is considered an indirect visual testing method?
A. Naked eye inspection
B. Mirror inspection
C. Use of borescopes
D. Magnifying glass
Answer: C
Rationale: Indirect VT uses optical aids such as borescopes or videoscopes
when direct line-of-sight is not possible.
3. According to ASNT standards, the minimum recommended light
intensity for general visual examination is:
A. 50 lux
B. 100 lux
C. 500 lux
D. 1000 lux
Answer: C
Rationale: ASNT and many codes specify a minimum of 500 lux (50 foot-
candles) for general visual examinations.
4. Visual acuity for VT personnel is commonly evaluated using which
test?
A. Ishihara test
, B. Jaeger chart
C. Snellen chart
D. Farnsworth D-15
Answer: C
Rationale: The Snellen chart is used to evaluate distance vision, a key
requirement for VT personnel.
5. The Ishihara test is primarily used to assess:
A. Depth perception
B. Near vision acuity
C. Color vision
D. Contrast sensitivity
Answer: C
Rationale: The Ishihara plates are designed to detect color vision
deficiencies.
6. Which discontinuity is BEST detected using Visual Testing?
A. Subsurface porosity
B. Internal shrinkage
C. Surface cracks
D. Laminations deep within material
, Answer: C
Rationale: VT is most effective for detecting surface-breaking
discontinuities such as cracks.
7. Magnification used during visual testing should generally not exceed:
A. 2X
B. 5X
C. 10X
D. 20X
Answer: B
Rationale: Excessive magnification can be misleading; most standards
recommend magnification not exceeding 5X for VT.
8. Which of the following is NOT a limitation of Visual Testing?
A. Requires surface accessibility
B. Limited to surface flaws
C. Can detect internal defects
D. Dependent on inspector skill
Answer: C
Rationale: VT cannot detect internal defects; this is not a limitation but an
incorrect capability.
