Tennessee Precision Machining
Certification Exam: GD&T for Precision
Machining Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What does GD&T stand for?
A. General Design and Tolerance Testing
B. Geometric Dimensioning and Tolerancing
C. Geometric Design and Tooling
D. General Dimensioning and Tolerance Techniques
Answer: B. Geometric Dimensioning and Tolerancing
Rationale: GD&T is a symbolic language used to define
engineering tolerances and design intent.
2. Which standard is most commonly associated with GD&T
in the United States?
A. ISO 2768
B. ANSI Y14.5
C. ASTM A36
D. SAE J403
Answer: B. ANSI Y14.5
,Rationale: ANSI/ASME Y14.5 establishes the rules and
symbols used in GD&T.
3. A datum is:
A. A machining operation
B. A tolerance zone
C. A theoretically exact reference feature
D. A cutting tool
Answer: C. A theoretically exact reference feature
Rationale: Datums provide reference points, axes, or planes
for measurement and inspection.
4. Which GD&T symbol represents flatness?
A. Circle
B. Parallelogram
C. Triangle
D. Straight line
Answer: B. Parallelogram
Rationale: The flatness symbol resembles a parallelogram.
5. Flatness controls:
A. Surface orientation
B. Surface form only
C. Feature location
D. Feature size
,Answer: B. Surface form only
Rationale: Flatness ensures a surface lies between two
parallel planes.
6. Which control does NOT require a datum?
A. Position
B. Perpendicularity
C. Flatness
D. Parallelism
Answer: C. Flatness
Rationale: Flatness is a form control and does not require a
datum reference.
7. Straightness is classified as:
A. Form control
B. Orientation control
C. Profile control
D. Runout control
Answer: A. Form control
Rationale: Straightness controls the shape of a line element.
8. Circularity is also known as:
A. Concentricity
B. Roundness
, C. Position
D. Cylindricity
Answer: B. Roundness
Rationale: Circularity controls how close a circular feature is
to a perfect circle.
9. Cylindricity controls:
A. Circularity only
B. Straightness only
C. Entire cylindrical surface
D. Diameter only
Answer: C. Entire cylindrical surface
Rationale: Cylindricity combines circularity, straightness, and
taper control.
10. Which symbol is used for perpendicularity?
A. ⊥
B. ∥
C. ⌖
D. ⌯
Answer: A. ⊥
Rationale: The perpendicularity symbol resembles an inverted
T.
Certification Exam: GD&T for Precision
Machining Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What does GD&T stand for?
A. General Design and Tolerance Testing
B. Geometric Dimensioning and Tolerancing
C. Geometric Design and Tooling
D. General Dimensioning and Tolerance Techniques
Answer: B. Geometric Dimensioning and Tolerancing
Rationale: GD&T is a symbolic language used to define
engineering tolerances and design intent.
2. Which standard is most commonly associated with GD&T
in the United States?
A. ISO 2768
B. ANSI Y14.5
C. ASTM A36
D. SAE J403
Answer: B. ANSI Y14.5
,Rationale: ANSI/ASME Y14.5 establishes the rules and
symbols used in GD&T.
3. A datum is:
A. A machining operation
B. A tolerance zone
C. A theoretically exact reference feature
D. A cutting tool
Answer: C. A theoretically exact reference feature
Rationale: Datums provide reference points, axes, or planes
for measurement and inspection.
4. Which GD&T symbol represents flatness?
A. Circle
B. Parallelogram
C. Triangle
D. Straight line
Answer: B. Parallelogram
Rationale: The flatness symbol resembles a parallelogram.
5. Flatness controls:
A. Surface orientation
B. Surface form only
C. Feature location
D. Feature size
,Answer: B. Surface form only
Rationale: Flatness ensures a surface lies between two
parallel planes.
6. Which control does NOT require a datum?
A. Position
B. Perpendicularity
C. Flatness
D. Parallelism
Answer: C. Flatness
Rationale: Flatness is a form control and does not require a
datum reference.
7. Straightness is classified as:
A. Form control
B. Orientation control
C. Profile control
D. Runout control
Answer: A. Form control
Rationale: Straightness controls the shape of a line element.
8. Circularity is also known as:
A. Concentricity
B. Roundness
, C. Position
D. Cylindricity
Answer: B. Roundness
Rationale: Circularity controls how close a circular feature is
to a perfect circle.
9. Cylindricity controls:
A. Circularity only
B. Straightness only
C. Entire cylindrical surface
D. Diameter only
Answer: C. Entire cylindrical surface
Rationale: Cylindricity combines circularity, straightness, and
taper control.
10. Which symbol is used for perpendicularity?
A. ⊥
B. ∥
C. ⌖
D. ⌯
Answer: A. ⊥
Rationale: The perpendicularity symbol resembles an inverted
T.
