TENNESSEE PRECISION MACHINING
CERTIFICATION Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
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1. What is the primary purpose of a micrometer?
A. Measure angles
B. Measure length with high precision
C. Measure pressure
D. Measure hardness
Answer: B. Measure length with high precision
Rationale: Micrometers are precision measuring tools used to
measure dimensions to thousandths of an inch or hundredths
of a millimeter.
2. Which machine tool is primarily used to produce
cylindrical parts?
A. Milling machine
B. Drill press
C. Lathe
D. Grinder
Answer: C. Lathe
Rationale: Lathes rotate the workpiece while cutting tools
remove material to create cylindrical shapes.
,3. What does CNC stand for?
A. Computer Numeric Control
B. Central Numeric Control
C. Computer Network Control
D. Central Network Computing
Answer: A. Computer Numeric Control
Rationale: CNC refers to machines controlled by programmed
computer instructions.
4. Which personal protective equipment is always required
in a machine shop?
A. Sandals
B. Safety glasses
C. Earbuds
D. Gloves near rotating equipment
Answer: B. Safety glasses
Rationale: Eye protection is essential to prevent injuries from
chips and debris.
5. A blueprint dimension of 2.500 ± 0.005 means the
acceptable range is:
A. 2.495–2.505
B. 2.490–2.510
,C. 2.500–2.505
D. 2.495–2.500
Answer: A. 2.495–2.505
Rationale: Add and subtract the tolerance value from the
nominal dimension.
6. What is the purpose of cutting fluid?
A. Increase friction
B. Cool and lubricate the cutting process
C. Reduce spindle speed
D. Harden the workpiece
Answer: B. Cool and lubricate the cutting process
Rationale: Cutting fluids reduce heat, improve tool life, and
enhance surface finish.
7. Which measuring instrument is commonly used to check
internal diameters?
A. Outside micrometer
B. Steel rule
C. Bore gauge
D. Surface plate
Answer: C. Bore gauge
Rationale: Bore gauges accurately measure internal
diameters and roundness.
, 8. What is the safest action before changing tooling on a
machine?
A. Increase feed rate
B. Leave machine running
C. Shut off machine power
D. Remove safety guards
Answer: C. Shut off machine power
Rationale: Power must be removed to prevent accidental
startup.
9. Which material is most commonly used for cutting tools?
A. Wood
B. Brass
C. High-speed steel or carbide
D. Plastic
Answer: C. High-speed steel or carbide
Rationale: HSS and carbide provide hardness and wear
resistance for machining operations.
10. What does RPM stand for?
A. Rotation Per Machine
B. Revolutions Per Minute
C. Rate Per Measurement
D. Rotation Process Method
Answer: B. Revolutions Per Minute
CERTIFICATION Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a micrometer?
A. Measure angles
B. Measure length with high precision
C. Measure pressure
D. Measure hardness
Answer: B. Measure length with high precision
Rationale: Micrometers are precision measuring tools used to
measure dimensions to thousandths of an inch or hundredths
of a millimeter.
2. Which machine tool is primarily used to produce
cylindrical parts?
A. Milling machine
B. Drill press
C. Lathe
D. Grinder
Answer: C. Lathe
Rationale: Lathes rotate the workpiece while cutting tools
remove material to create cylindrical shapes.
,3. What does CNC stand for?
A. Computer Numeric Control
B. Central Numeric Control
C. Computer Network Control
D. Central Network Computing
Answer: A. Computer Numeric Control
Rationale: CNC refers to machines controlled by programmed
computer instructions.
4. Which personal protective equipment is always required
in a machine shop?
A. Sandals
B. Safety glasses
C. Earbuds
D. Gloves near rotating equipment
Answer: B. Safety glasses
Rationale: Eye protection is essential to prevent injuries from
chips and debris.
5. A blueprint dimension of 2.500 ± 0.005 means the
acceptable range is:
A. 2.495–2.505
B. 2.490–2.510
,C. 2.500–2.505
D. 2.495–2.500
Answer: A. 2.495–2.505
Rationale: Add and subtract the tolerance value from the
nominal dimension.
6. What is the purpose of cutting fluid?
A. Increase friction
B. Cool and lubricate the cutting process
C. Reduce spindle speed
D. Harden the workpiece
Answer: B. Cool and lubricate the cutting process
Rationale: Cutting fluids reduce heat, improve tool life, and
enhance surface finish.
7. Which measuring instrument is commonly used to check
internal diameters?
A. Outside micrometer
B. Steel rule
C. Bore gauge
D. Surface plate
Answer: C. Bore gauge
Rationale: Bore gauges accurately measure internal
diameters and roundness.
, 8. What is the safest action before changing tooling on a
machine?
A. Increase feed rate
B. Leave machine running
C. Shut off machine power
D. Remove safety guards
Answer: C. Shut off machine power
Rationale: Power must be removed to prevent accidental
startup.
9. Which material is most commonly used for cutting tools?
A. Wood
B. Brass
C. High-speed steel or carbide
D. Plastic
Answer: C. High-speed steel or carbide
Rationale: HSS and carbide provide hardness and wear
resistance for machining operations.
10. What does RPM stand for?
A. Rotation Per Machine
B. Revolutions Per Minute
C. Rate Per Measurement
D. Rotation Process Method
Answer: B. Revolutions Per Minute
