Interactive Quiz

So you think you know Geometric Dimensioning and Tolerancing (GD&T)? Take our real-time interactive quiz. You'll receive your score immediately after completing the quiz.

This test is for the evaluation of knowledge and skills in Geometric Dimensioning & Tolerancing per the ASME Y14.5M-1994 standard.

1. Which statement best describes what the ASME-Y14.5M-1994 covers?

a	Dimensioning and tolerancing standards for drafting and gaging of rigid mechanical parts.
b	A symbolic means of dimensioning and tolerancing
c	Dimensioning and tolerancing standard with respect to how parts are manufactured.
d	Establishes uniform practices for stating and interpreting dimensioning, tolerancing, and related requirements for use on engineering drawings and related documents.

2. Using GD&T:

a	Tighter tolerances can be achieved in manufacturing.
b	Creates a means for expressing the true design requirements for a part.
c	More tolerance is made available to manufacturing than is possible with only plus/minus tolerancing
d	Both b) and c)

3. How can properly implemented GD&T save money in the manufacturing process?

a	Better definition of the design requirements, increased availability of tolerances, better communication between design, manufacturing and inspection, fewer engineering changes.
b	It can't. GD&T is just a way to illustrate how to inspect parts.
c	By creating extra tolerance that did not physically exist without using GD&T.
d	By defining the datum references that must be used by manufacturing for fixturing.

4. What is a Basic Dimension?

a	An exact dimension with no tolerance associated with it.
b	A dimension in a box that must be strictly adhered to by manufacturing
c	The nominal size of a feature.
d	A numerical value that describes a theoretically exact size, profile, orientation or location of a feature or a datum target. It is the basis from which permissible variations (tolerances) are established.

5. What is a Feature Control Frame?

a	A symbolic means of expressing the type of control on a feature, and defining a tolerance zone for that control.
b	A box on the drawing that tells the manufacturer how to make the part.
c	A box on the drawing that tells the inspector what measurements have to be made for every part.
d	A symbol that dictates the tolerance of position for a datum target

6. Match the Geometric Characteristic Symbols with their respective descriptions:

Straightness	a)
Flatness	b)
Circularity	c)
Cylindricity	d)
Profile of a Line	e)
Profile of a Surface	f)
Perpendicularity	g)
Angularity	h)
Parallelism	i)
Circular Runout	j)
Total Runout	k)
Position	l)
Concentricity	m)
Symmetry	n)

7. What is a "Material Condition Modifier?"

a	The maximum dimension possible according to the tolerance specified.
b	The minimum dimension possible according to the tolerance specified.
c	A symbol placed on a feature of size that states how much tolerance is available for that feature.
d	A symbol placed in a feature control frame that indicates how much, or if, any extra geometric tolerance is available for the feature as the actual mating size of the feature changes.

8. A positional tolerance defines:

a	A zone within which the center, axis, or center plane of a feature of size is permitted to vary from a true position.
b	A boundary located at the true position that may not be violated by the surface or surfaces of the considered feature, if the position specification is on an MMC or LMC basis.
c	Both a and b.
d	Neither a nor b.

9. Which is the correct definition of regardless of feature size?

a	Regardless of where a feature of size lies within its form tolerance, the tolerance of size must be met.
b	Control placed on a feature of size stating that the tolerance of form or position must be met regardless of where the feature lies within its form tolerance.
c	Regardless of where a feature of size lies within its size tolerance, the tolerance of size must be met.
d	Control placed on a feature of size stating that the geometric tolerance must be met regardless of where the feature lies within its size tolerance.

10. What is "Rule 1" (i.e. the "Envelope Rule" or the "Perfect form at MMC Rule"), and what effect does it have, if any, on flatness? ...straightness? ...perpendicularity? ...position?

a	Unless otherwise specified, the limits of size of an individual feature of size control the form of the feature as well as the size. The rule can control flatness and straightness, but not perpendicularity or position.
b	Size tolerance controls form tolerance. This rule has no effect on flatness, straightness, or position.
c	If specified by using an MMC symbol next to the tolerances in a feature control frame, then size tolerance controls form. It affects flatness, straightness, perpendicularity and position.
d	Rule 1 states that the form of a feature must always be perfect, but it has no effect on perpendicularity.

11. What is the difference between a Datum, a Datum Feature, a Datum Feature Simulator, and a Simulated Datum?

a	A Datum and Datum Feature are synonymous, as are Datum Feature Simulator and Simulated Datum.
b	A Datum is theoretical, a Datum Feature is a real part, a Datum Feature Simulator is a gage quality representation of the Datum Feature (or its counterpart), and a Simulated Datum is the point from which actual measurements are made (i.e. as derived from the Datum Feature Simulator and the Datum Feature).
c	There is no difference.
d	Datums and Simulated Datums are theoretical, but Datum Features and Datum Feature Simulators are real.

12. What is a Datum Reference Frame?

a	Any arbitrary coordinate system.
b	A set of target points from which measurements are made.
c	A symbol on the drawing that specifies the tolerance associated with a particular feature.
d	A set of three mutually perpendicular planes derived from the specified Datum Features in the order of precedence listed in a feature control frame.

13. What is MMC Virtual Condition?

a	The collective effect of the MMC limit of size of a feature of size, and any applicable geometric tolerance.
b	The largest external feature (e.g. pin), or the smallest internal feature (e.g. hole).
c	The perfectly formed envelope that just fits around (or inside of) a feature of size.
d	Rule 1 states that the form of a feature must always be perfect, but it has no effect on perpendicularity.

Refer to Figure 1 for the following questions:

14. What is the MMC size of one of the holes?

a	Ø.240
b	Ø.250
c	Ø.260
d	Ø.270

15. What is the MMC Virtual Condition size of one of the holes?

a	Ø.240
b	Ø.250
c	Ø.260
d	Ø.270

16. What is the LMC size of one of the holes?

a	Ø.240
b	Ø.250
c	Ø.260
d	Ø.270

17. How much total positional tolerance would be available for one hole if that hole was produced at a size of Ø.255?

a	Ø.010
b	Ø.005
c	Ø.020
d	Ø.015

Refer to Figure 2 for the following question:

18. Datum feature "B" actual dimension is 2.49. Datum feature "C" came in at 3.01. Now how much total positional tolerance does that one hole (relative to the other holes in the pattern) have? (The considered hole is still Ø.255.)

a	.010 in one direction and .030 in another direction
b	Ø.005
c	Ø.020
d	Ø.015

19. With the same actual datum feature sizes and considered hole size defined in the previous question, how much extra tolerance does the 4-hole pattern have relative to the "center of the part?" (Datum features "B" and "C" define the "Center" of the part.)

a	.010 in one direction and .030 in another direction
b	Ø.005
c	.040 total
d	Ø.015 relative to "B" and "C"

20. Complete the table for the figure shown below: (all answers should be entered as ".XXX".)

Actual Manufactured Hole
Size (measured)

Total Position Tolerance

When ? = M

When ? = L

When ? = S

Ø.250

a) Ø

i) Ø

q) Ø

Ø.251

b) Ø

j) Ø

r) Ø

Ø.252

c) Ø

k) Ø

s) Ø

Ø.253

d) Ø

l) Ø

t) Ø

Ø.254

e) Ø

m) Ø

u) Ø

Ø.255

f) Ø

n) Ø

v) Ø

Ø.258

g) Ø

o) Ø

w) Ø

Ø.260

h) Ø

p) Ø

x) Ø

21. The use of zero positional tolerance at MMC:

a	Requires the use of separate Datum Reference Frames.
b	Results in an increase in the size tolerance for clearance holes.
c	Allows the diameter symbol to be omitted from the FCF.
d	Is not allowed.

22. A profile tolerance used in conjunction with a BOUNDARY position feature control frame:

a	Should only be done in cases where extremely tight control of a surface is required.
b	Is a method for utilizing the tolerance afforded by the use of MMC when controlling the location and orientation of a non-standard shape (not a simple cylinder or width feature).
c	Controls location of a feature more tightly than the orientation of the feature.
d	Means that the profile tolerance controls the size and orientation of the feature, while the position tolerance controls location only.

23. A projected tolerance zone:

a	Is required on all fixed fastener applications.
b	Is required on assemblies where studs or press-fit pins are located on one of the mating parts.
c	Is required on both the mating part containing the clearance hole, and on the mating part containing the fixed fastener hole.
d	Is applicable where threaded or plain holes for studs or pins are located on detail part drawings.

24. Using Figure 4, how flat must the considered surfaces be now (worst case) to meet the print requirements?

a	0.1
b	0.2
c	0.3
d	0.4

25. In Figure 4, if the actual measurement when checking the 50 Basic Dimension was 50.15, would that surface be within the print specifications?

a	YES
b	NO