Deck 27: Geometric Tolerances - Datums

Question 1

The perfect location of a point, line, or surface is:

A)True position
B)Positional tolerance
C)A datum
D)A datum axis

Answer 1

A

Question 2

A datum axis is the theoretical exact centerline of a datum cylinder.

Answer 2

True

Question 3

A symbol for a circular datum target includes:

A)A datum feature reference letter
B)A datum target number
C)The diameter of the target
D)"a", "b", and "c" are correct
E)Only "a" and "b" are correct
F)Only "a" and "c" are correct

Answer 3

D

Question 4

A basic dimension is:

A)A dimension that is a whole number
B)The nominal size of a feature
C)An exact theoretical dimension used to locate a feature or define a true profile
D)A dimension that results from subtracting the tolerance from the nominal dimension

Question 5

Primary datum planes are developed by establishing ________ point(s)of contact on the primary datum surface.

A)One
B)Two
C)Three
D)Four or more

Question 6

Allowable variations in basic dimensions are established by tolerances in the feature control frame.

Question 7

The symbol that consists of a capital letter enclosed in a box is:

A)A primary datum
B)A datum target
C)A datum identification symbol
D)A datum feature

Question 8

In a feature control frame, the datum appears before the tolerance.

Question 9

Geometric dimensioning controls:

A)The form of a part
B)The position of features on a part
C)The form of a part and the position of features on the part

Question 10

Geometric characteristic symbols (or feature control symbols)include symbols for:

A)Hole size, circularity, and position
B)Flatness, length, and parallelism
C)Surface finish, position, and profile of a surface
D)Angularity, circular runout, and cylindricity

Question 11

A geometric control symbol, tolerance, and datum that apply to a feature's specification are contained in a feature control frame.

Question 12

A datum feature is a real physical part of the object that may have surface variations.

Question 13

More than one datum plane may be used to establish positional relationships on a part.

Question 14

The intentional difference in size between mating parts is called:

A)Tolerance
B)Allowance
C)Maximum material condition
D)Minimum material condition

Question 15

For castings or other parts that have irregular surfaces, these are often used to establish the position of the part for manufacturing or inspection purposes:

A)Datum planes
B)Datum targets
C)True positions
D)Form tolerances

Question 16

A datum cylinder may be internal (a round hole)or external (a round shaft).

Question 17

The actual part surface or feature used to establish a datum is a:

A)Datum target
B)Specified datum
C)True position
D)Datum feature