CNC MACHINIST CERTIFICATION PRACTICE
TEST PRACTICE 100+ QUESTIONS 2026 –
VERIFIED Q&A WITH RATIONALES FROM
CERTIFIED EXAMINER ACTUAL EXAM PREP
100% FAST REVISION
Examining Board: National Industrial Skills Assessment Authority (NISAA)
Time Allowed: 3 Hours
Total Marks: 100
Table of Content Covered in Exam
1 CNC Machine Fundamentals
2 Engineering Drawings and Measurement
3 Cutting Tools and Materials
4 CNC Programming (G-code and M-code)
5 Machine Setup and Operation
6 Workholding and Fixtures
7 Speeds, Feeds, and Calculations
8 Safety and Maintenance
9 Quality Control and Inspection
10 Troubleshooting and Optimization
SECTION A:
1 What does CNC stand for
A Computer Numerical Control
B Central Numeric Command
C Computerized Network Control
D Controlled Numeric Circuit
Answer: A Computer Numerical Control
Explanation: CNC refers to automated control of machining tools using computer programming.
,2 Which axis is typically vertical on a CNC milling machine
A X-axis
B Y-axis
C Z-axis
D W-axis
Answer: C Z-axis
Explanation: The Z-axis represents vertical movement in most CNC milling machines.
3 What is the main function of G-code
A Control machine hardware
B Control tool movement
C Control coolant flow
D Control spindle lubrication
Answer: B Control tool movement
Explanation: G-codes define motion such as positioning, cutting, and path control.
4 Which measuring tool is most precise
A Steel ruler
B Vernier caliper
C Micrometer
D Tape measure
Answer: C Micrometer
Explanation: Micrometers provide higher accuracy than calipers or rulers.
5 What does M03 command do
A Stops spindle
B Starts spindle clockwise
C Starts spindle counterclockwise
D Changes tool
Answer: B Starts spindle clockwise
Explanation: M03 activates spindle rotation in the clockwise direction.
6 What is the purpose of coolant
A Increase friction
, B Reduce tool wear
C Increase heat
D Reduce spindle speed
Answer: B Reduce tool wear
Explanation: Coolant reduces heat and friction, extending tool life.
7 Which material is commonly used for cutting tools
A Wood
B Plastic
C High-speed steel
D Rubber
Answer: C High-speed steel
Explanation: HSS is durable and widely used for machining operations.
8 What does G00 indicate
A Linear interpolation
B Rapid movement
C Circular motion
D Tool change
Answer: B Rapid movement
Explanation: G00 commands the machine to move quickly without cutting.
9 What is tolerance in machining
A Tool size
B Machine speed
C Acceptable variation in dimension
D Cutting depth
Answer: C Acceptable variation in dimension
Explanation: Tolerance defines allowable deviation from a specified size.
10 Which operation produces a flat surface
A Turning
B Milling
C Drilling
TEST PRACTICE 100+ QUESTIONS 2026 –
VERIFIED Q&A WITH RATIONALES FROM
CERTIFIED EXAMINER ACTUAL EXAM PREP
100% FAST REVISION
Examining Board: National Industrial Skills Assessment Authority (NISAA)
Time Allowed: 3 Hours
Total Marks: 100
Table of Content Covered in Exam
1 CNC Machine Fundamentals
2 Engineering Drawings and Measurement
3 Cutting Tools and Materials
4 CNC Programming (G-code and M-code)
5 Machine Setup and Operation
6 Workholding and Fixtures
7 Speeds, Feeds, and Calculations
8 Safety and Maintenance
9 Quality Control and Inspection
10 Troubleshooting and Optimization
SECTION A:
1 What does CNC stand for
A Computer Numerical Control
B Central Numeric Command
C Computerized Network Control
D Controlled Numeric Circuit
Answer: A Computer Numerical Control
Explanation: CNC refers to automated control of machining tools using computer programming.
,2 Which axis is typically vertical on a CNC milling machine
A X-axis
B Y-axis
C Z-axis
D W-axis
Answer: C Z-axis
Explanation: The Z-axis represents vertical movement in most CNC milling machines.
3 What is the main function of G-code
A Control machine hardware
B Control tool movement
C Control coolant flow
D Control spindle lubrication
Answer: B Control tool movement
Explanation: G-codes define motion such as positioning, cutting, and path control.
4 Which measuring tool is most precise
A Steel ruler
B Vernier caliper
C Micrometer
D Tape measure
Answer: C Micrometer
Explanation: Micrometers provide higher accuracy than calipers or rulers.
5 What does M03 command do
A Stops spindle
B Starts spindle clockwise
C Starts spindle counterclockwise
D Changes tool
Answer: B Starts spindle clockwise
Explanation: M03 activates spindle rotation in the clockwise direction.
6 What is the purpose of coolant
A Increase friction
, B Reduce tool wear
C Increase heat
D Reduce spindle speed
Answer: B Reduce tool wear
Explanation: Coolant reduces heat and friction, extending tool life.
7 Which material is commonly used for cutting tools
A Wood
B Plastic
C High-speed steel
D Rubber
Answer: C High-speed steel
Explanation: HSS is durable and widely used for machining operations.
8 What does G00 indicate
A Linear interpolation
B Rapid movement
C Circular motion
D Tool change
Answer: B Rapid movement
Explanation: G00 commands the machine to move quickly without cutting.
9 What is tolerance in machining
A Tool size
B Machine speed
C Acceptable variation in dimension
D Cutting depth
Answer: C Acceptable variation in dimension
Explanation: Tolerance defines allowable deviation from a specified size.
10 Which operation produces a flat surface
A Turning
B Milling
C Drilling
