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GD&T Practice Test (25 Questions)
Answer all questions, then hit “Score Test”.
1What does MMC allow you to gain when the feature departs from MMC?
Tighter tolerance Bonus tolerance Datum shift only Surface finish

2True position controls the location of a feature relative to:
Tool wear A datum reference frame Surface roughness Heat treat condition

3Flatness is a:
Form control (no datum required) Orientation control (datum required) Location control (datum required) Runout control (datum required)

4Which GD&T control does NOT require a datum?
Parallelism Position Flatness Perpendicularity

5Bonus tolerance is available when:
A feature is at MMC A feature departs from MMC A datum is referenced LMC is applied

6Which control is best for locating a hole pattern for assembly?
Concentricity Circular runout True position Symmetry

7Which control limits the overall form of a cylindrical feature?
Circularity Straightness Cylindricity Runout

8Parallelism controls:
Form only Orientation relative to a datum Location relative to datums Size only

9Which control is considered expensive and difficult to inspect?
Position Flatness Concentricity Parallelism

10A feature control frame showing ⌀0.20 | A | B | C controls:
Size Form Orientation Location

11What does RFS mean?
Reference from surface Regardless of feature size Relative to functional size Reduced feature size

12Which control would replace concentricity in most designs?
Circularity Profile True position Flatness

13Which control requires inspection during rotation of the part?
Flatness Circular runout Position Perpendicularity

14Total runout controls:
Location only Orientation only Individual cross-sections Entire surface variation

15Which datum is typically designated as datum A?
Smallest feature Most critical functional surface First machined surface Cosmetic surface

16Which GD&T control would best limit taper and barrel shape?
Circularity Straightness Cylindricity Runout

17Profile of a surface controls:
2D shape only 3D surface variation Orientation only Size only

18Which control requires two parallel planes as its tolerance zone?
Flatness Parallelism Straightness Circularity

19Which control would be most appropriate for a gasket sealing surface?
Parallelism Flatness Position Runout

20What happens to positional tolerance when a hole is produced larger than MMC?
Tolerance decreases Tolerance stays the same Bonus tolerance is added Part is automatically rejected

21Which GD&T control can replace plus/minus tolerancing for complex shapes?
Position Profile Flatness Straightness

22Which control is best inspected with a CMM?
Flatness Concentricity Straightness Size

23Which control ensures a feature is 90° to a datum?
Parallelism Angularity Perpendicularity Position

24Which control limits wobble on a rotating shaft?
Position Circular runout Symmetry Flatness

25Which statement is TRUE?
Flatness requires a datum Position controls size Cylindricity includes straightness and roundness Runout replaces profile

G & M Code Practice Test (25 Questions)
Fanuc/Haas-style basics. Answer all questions, then hit “Score Test”.
1G00 is used for:
Linear feed move Rapid positioning Circular interpolation Dwell

2G01 requires which word to control the rate of motion?
S F T H

3G02 / G03 are used for:
Threading Circular interpolation Tool length comp Canned drilling only

4On a typical mill, G17 selects the:
XZ plane YZ plane XY plane Polar plane

5G20 and G21 typically set:
Cutter comp Work offsets Inch / Metric units Spindle direction

6G90 typically means:
Incremental programming Absolute programming Tool comp on Return to machine home

7G91 typically means:
Absolute programming Incremental programming Cancel cutter comp Select work offset

8G54 is most commonly used to:
Select a work coordinate system Turn spindle on CW Turn coolant on Cancel tool length comp

9G43 is commonly used for:
Tool length compensation + Cutter comp left Cancel work offset Spindle orient

10G49 typically cancels:
Cutter comp Tool length comp Work offset Canned cycles

11G40 typically cancels:
Tool length comp Cutter radius comp Work offset Spindle

12G41 and G42 are used for:
Tool length comp Cutter radius compensation Spindle speed override Canned drilling cycles

13G80 typically cancels:
Cutter comp Canned cycles Work offsets Spindle direction

14G81 is commonly a:
Simple drilling cycle Peck drilling cycle Tapping cycle Boring cycle

15G83 is commonly a:
Drilling cycle (no retract) Peck drilling cycle Tapping cycle Circular pocket cycle

16G84 is commonly a:
Reaming cycle Tapping cycle Boring cycle Thread milling cycle

17G28 is commonly used to:
Return to machine home (via intermediate point) Select work offset Turn coolant off Turn spindle on CCW

18M03 typically means:
Spindle on clockwise Spindle on counterclockwise Spindle stop Coolant on

19M04 typically means:
Coolant on Spindle stop Spindle on counterclockwise Tool change

20M05 typically means:
Spindle stop Program stop Coolant off Optional stop

21M06 typically means:
Tool change Spindle orient Coolant on End of program

22M08 typically means:
Coolant on Coolant off Spindle stop Optional stop

23M09 typically means:
Coolant on Coolant off Program end Tool change

24M30 typically means:
Optional stop End of program and rewind/reset Program stop Spindle stop

25M01 typically means:
Program stop Optional stop (if enabled) End of program Tool change

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GD&T Practice Test (25 Questions)

G & M Code Practice Test (25 Questions)

Contact Valencia Precision

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