Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
Q1.
A hole pattern is controlled with a position tolerance of ⌀0.4 at MMC relative to datums A|B|C. If the
actual hole size departs from MMC by 0.2 mm, what is the resulting allowable positional tolerance?
A. ⌀0.4
B. ⌀0.6
C. ⌀0.2
D. ⌀0.8
Correct Answer: B
Explanation:
With MMC applied, bonus tolerance equals the departure from MMC.
⌀0.4 + 0.2 = ⌀0.6 total positional tolerance
Q2.
Which geometric control defines the tolerance zone as two parallel planes within which the entire
surface must lie?
A. Flatness
B. Profile of a surface
C. Parallelism
D. Straightness
Correct Answer: C
Explanation:
Parallelism creates a tolerance zone of two parallel planes oriented relative to a datum, unlike
flatness which has no datum reference.
Q3.
A composite position tolerance is applied to a bolt pattern. What is the primary purpose of the lower
segment of the feature control frame?
A. Control orientation to datums
B. Refine feature size
C. Control feature-to-feature relationship
D. Establish virtual condition
Correct Answer: C
Explanation:
The lower segment controls the relationship between pattern features, independent of datums.
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
Q4.
Which tolerance controls circularity of a feature at every cross-section perpendicular to its axis?
A. Cylindricity
B. Circular runout
C. Circularity
D. Position
Correct Answer: C
Explanation:
Circularity (roundness) applies independently at every cross-section and does not reference
datums.
Q5.
In datum referencing, which datum feature simulator establishes the primary datum for a planar
surface?
A. Line contact
B. Axis extraction
C. Plane simulator
D. Tangent plane
Correct Answer: C
Explanation:
A perfect plane simulator establishes a primary planar datum per ASME Y14.5.
Q6.
What is the tolerance zone shape for concentricity?
A. Cylindrical zone
B. Spherical zone
C. Parallel planes
D. Rectangular prism
Correct Answer: A
Explanation:
Concentricity defines a cylindrical tolerance zone centered on the datum axis.
Q7.
Which modifier allows a datum feature to shift within its tolerance during inspection?
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
A. MMC
B. LMC
C. RFS
D. Datum feature shift
Correct Answer: A
Explanation:
Datum features referenced at MMC allow datum shift, improving functional assembly.
Q8.
Which tolerance best controls the total variation of a rotating shaft relative to a datum axis?
A. Circular runout
B. Total runout
C. Cylindricity
D. Position
Correct Answer: B
Explanation:
Total runout controls form, orientation, and location simultaneously over the entire surface.
Q9.
A profile of a surface tolerance applied without datums controls:
A. Location only
B. Orientation only
C. Form only
D. Form and size
Correct Answer: C
Explanation:
Without datums, profile controls only form, not orientation or location.
Q10.
Which principle states that perfect form at MMC is required unless otherwise specified?
A. Rule #2
B. Envelope Principle
C. Taylor Principle
D. Reciprocity Principle
Correct Answer: B
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
Explanation:
The Envelope Principle (Rule #1) requires perfect form at MMC.
Q11.
Which GD&T symbol is used to control the median plane of a slot?
A. Flatness
B. Position
C. Profile
D. Parallelism
Correct Answer: B
Explanation:
Position can be applied to features of size, including slots, controlling their median plane.
Q12.
What type of tolerance zone is created by perpendicularity applied to an axis?
A. Two parallel planes
B. Cylindrical zone
C. Rectangular prism
D. Conical zone
Correct Answer: B
Explanation:
Axis perpendicularity uses a cylindrical tolerance zone oriented 90° to the datum.
Q13.
Which symbol indicates a projected tolerance zone?
A. Ⓜ
B. Ⓟ
C. Ⓛ
D. Ⓢ
Correct Answer: B
Explanation:
The Ⓟ symbol specifies a projected tolerance zone, commonly for fastener engagement.
Q14.
Technologist Latest Practice Exam (Updated Edition)
Q1.
A hole pattern is controlled with a position tolerance of ⌀0.4 at MMC relative to datums A|B|C. If the
actual hole size departs from MMC by 0.2 mm, what is the resulting allowable positional tolerance?
A. ⌀0.4
B. ⌀0.6
C. ⌀0.2
D. ⌀0.8
Correct Answer: B
Explanation:
With MMC applied, bonus tolerance equals the departure from MMC.
⌀0.4 + 0.2 = ⌀0.6 total positional tolerance
Q2.
Which geometric control defines the tolerance zone as two parallel planes within which the entire
surface must lie?
A. Flatness
B. Profile of a surface
C. Parallelism
D. Straightness
Correct Answer: C
Explanation:
Parallelism creates a tolerance zone of two parallel planes oriented relative to a datum, unlike
flatness which has no datum reference.
Q3.
A composite position tolerance is applied to a bolt pattern. What is the primary purpose of the lower
segment of the feature control frame?
A. Control orientation to datums
B. Refine feature size
C. Control feature-to-feature relationship
D. Establish virtual condition
Correct Answer: C
Explanation:
The lower segment controls the relationship between pattern features, independent of datums.
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
Q4.
Which tolerance controls circularity of a feature at every cross-section perpendicular to its axis?
A. Cylindricity
B. Circular runout
C. Circularity
D. Position
Correct Answer: C
Explanation:
Circularity (roundness) applies independently at every cross-section and does not reference
datums.
Q5.
In datum referencing, which datum feature simulator establishes the primary datum for a planar
surface?
A. Line contact
B. Axis extraction
C. Plane simulator
D. Tangent plane
Correct Answer: C
Explanation:
A perfect plane simulator establishes a primary planar datum per ASME Y14.5.
Q6.
What is the tolerance zone shape for concentricity?
A. Cylindrical zone
B. Spherical zone
C. Parallel planes
D. Rectangular prism
Correct Answer: A
Explanation:
Concentricity defines a cylindrical tolerance zone centered on the datum axis.
Q7.
Which modifier allows a datum feature to shift within its tolerance during inspection?
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
A. MMC
B. LMC
C. RFS
D. Datum feature shift
Correct Answer: A
Explanation:
Datum features referenced at MMC allow datum shift, improving functional assembly.
Q8.
Which tolerance best controls the total variation of a rotating shaft relative to a datum axis?
A. Circular runout
B. Total runout
C. Cylindricity
D. Position
Correct Answer: B
Explanation:
Total runout controls form, orientation, and location simultaneously over the entire surface.
Q9.
A profile of a surface tolerance applied without datums controls:
A. Location only
B. Orientation only
C. Form only
D. Form and size
Correct Answer: C
Explanation:
Without datums, profile controls only form, not orientation or location.
Q10.
Which principle states that perfect form at MMC is required unless otherwise specified?
A. Rule #2
B. Envelope Principle
C. Taylor Principle
D. Reciprocity Principle
Correct Answer: B
, Geometric Dimensioning Tolerancing Professional
Technologist Latest Practice Exam (Updated Edition)
Explanation:
The Envelope Principle (Rule #1) requires perfect form at MMC.
Q11.
Which GD&T symbol is used to control the median plane of a slot?
A. Flatness
B. Position
C. Profile
D. Parallelism
Correct Answer: B
Explanation:
Position can be applied to features of size, including slots, controlling their median plane.
Q12.
What type of tolerance zone is created by perpendicularity applied to an axis?
A. Two parallel planes
B. Cylindrical zone
C. Rectangular prism
D. Conical zone
Correct Answer: B
Explanation:
Axis perpendicularity uses a cylindrical tolerance zone oriented 90° to the datum.
Q13.
Which symbol indicates a projected tolerance zone?
A. Ⓜ
B. Ⓟ
C. Ⓛ
D. Ⓢ
Correct Answer: B
Explanation:
The Ⓟ symbol specifies a projected tolerance zone, commonly for fastener engagement.
Q14.
