Practice Exam Questions And Correct

NIMS CNC Programmer Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What does CNC stand for?

a) Computer Numeric Code

b) Computer Numerical Control

c) Central Numeric Control

d) Controlled Numerical Coding

Rationale: CNC stands for Computer Numerical Control, which refers

to computer-based control of machine tools.

2. The primary function of a CNC programmer is to:

a) Maintain the machine

b) Load raw materials

c) Create programs that control machining operations 1 / 4

d) Inspect the finished parts

Rationale: CNC programmers develop coded instructions that dictate

machine operations and cutting paths.

3. In G-code programming, G01 represents:

a) Rapid positioning

b) Linear interpolation

c) Circular interpolation clockwise

d) Circular interpolation counterclockwise

Rationale: G01 specifies linear cutting movement at a controlled feed

rate.

4. The G00 command is used for:

a) Rapid positioning

b) Linear interpolation

c) Tool change

d) Program stop

Rationale: G00 moves the tool quickly to a specified position without

cutting.

5. The M03 command in CNC programming indicates:

a) Spindle ON clockwise

b) Spindle OFF

c) Spindle ON counterclockwise

d) Coolant ON

Rationale: M03 turns the spindle on in the clockwise direction. 2 / 4

• What is the typical coordinate system used in CNC machining?

a) Polar coordinates

b) Cylindrical coordinates

c) Cartesian coordinates (X, Y, Z)

d) Incremental coordinates

Rationale: CNC machines use Cartesian coordinate systems for

movement in X, Y, and Z directions.

7. In CNC programming, the letter F represents:

a) Feed direction

b) Feed rate

c) Finish pass

d) Fixture offset

Rationale: F specifies the feed rate, the speed at which the tool

moves during cutting.

8. The G02 command represents:

a) Linear interpolation

b) Circular interpolation clockwise

c) Circular interpolation counterclockwise

d) Program stop

Rationale: G02 moves the tool in a clockwise circular path.

9. The G03 command represents:

a) Circular interpolation clockwise

b) Circular interpolation counterclockwise 3 / 4

c) Rapid traverse

d) Program end

Rationale: G03 specifies counterclockwise circular interpolation.

10. The letter S in a CNC program controls:

a) Feed rate

b) Tool number

c) Spindle speed (RPM)

d) Program start

Rationale: S sets the spindle rotation speed in revolutions per minute.

11. The letter T in a CNC program indicates:

a) Tool selection

b) Feed rate

c) Speed

d) Cycle start

Rationale: T identifies the tool number to be used in the machining

operation.

• The M06 command performs what action?

a) Tool change

b) Coolant ON

c) Cycle stop

d) Machine reset

Rationale: M06 instructs the machine to change to the designated

tool.

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