Tennessee Precision Machining
Certification Exam: Precision Inspection &
Metrology Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of metrology in
manufacturing?
A. Increase machine speed
B. Reduce labor costs
C. Ensure dimensional accuracy and quality
D. Improve packaging
Answer: C. Ensure dimensional accuracy and quality
Metrology is the science of measurement used to verify that
parts meet specifications and quality requirements.
2. Which measuring tool is best for checking an outside
diameter to ±0.001 inch?
A. Steel rule
B. Tape measure
C. Micrometer
D. Protractor
Answer: C. Micrometer
,Outside micrometers provide much higher precision than
rulers or tape measures.
3. One revolution of a standard micrometer spindle equals:
A. 0.010 in.
B. 0.025 in.
C. 0.050 in.
D. 0.100 in.
Answer: B. 0.025 in.
Most inch micrometers have 40 threads per inch, resulting in
0.025 inch spindle travel per revolution.
4. What measuring instrument is commonly used to
measure hole diameters?
A. Outside micrometer
B. Feeler gauge
C. Dial bore gauge
D. Surface plate
Answer: C. Dial bore gauge
Dial bore gauges are designed specifically for precise internal
diameter measurements.
5. Which instrument is best for measuring depth?
A. Combination square
B. Depth micrometer
,C. Surface gauge
D. Radius gauge
Answer: B. Depth micrometer
Depth micrometers accurately measure depths of slots, holes,
and recesses.
6. A vernier caliper can measure:
A. Only outside dimensions
B. Only inside dimensions
C. Only depth
D. Outside, inside, and depth dimensions
Answer: D. Outside, inside, and depth dimensions
Calipers are versatile tools capable of measuring multiple
feature types.
7. What is the standard reference surface for precision
inspection?
A. Machine table
B. Granite countertop
C. Surface plate
D. Workbench
Answer: C. Surface plate
Surface plates provide an accurate flat reference plane.
, 8. Gauge blocks are primarily used to:
A. Sharpen tools
B. Check machine speed
C. Establish precise known dimensions
D. Measure angles
Answer: C. Establish precise known dimensions
Gauge blocks serve as precision length standards.
9. What does calibration ensure?
A. Faster machining
B. Better tool life
C. Measurement accuracy
D. Reduced setup time
Answer: C. Measurement accuracy
Calibration compares measuring devices to known standards
to ensure accuracy.
10. A dial indicator measures:
A. Temperature
B. Pressure
C. Small dimensional variations
D. Surface hardness
Answer: C. Small dimensional variations
Dial indicators detect minor deviations from a reference
position.
Certification Exam: Precision Inspection &
Metrology Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of metrology in
manufacturing?
A. Increase machine speed
B. Reduce labor costs
C. Ensure dimensional accuracy and quality
D. Improve packaging
Answer: C. Ensure dimensional accuracy and quality
Metrology is the science of measurement used to verify that
parts meet specifications and quality requirements.
2. Which measuring tool is best for checking an outside
diameter to ±0.001 inch?
A. Steel rule
B. Tape measure
C. Micrometer
D. Protractor
Answer: C. Micrometer
,Outside micrometers provide much higher precision than
rulers or tape measures.
3. One revolution of a standard micrometer spindle equals:
A. 0.010 in.
B. 0.025 in.
C. 0.050 in.
D. 0.100 in.
Answer: B. 0.025 in.
Most inch micrometers have 40 threads per inch, resulting in
0.025 inch spindle travel per revolution.
4. What measuring instrument is commonly used to
measure hole diameters?
A. Outside micrometer
B. Feeler gauge
C. Dial bore gauge
D. Surface plate
Answer: C. Dial bore gauge
Dial bore gauges are designed specifically for precise internal
diameter measurements.
5. Which instrument is best for measuring depth?
A. Combination square
B. Depth micrometer
,C. Surface gauge
D. Radius gauge
Answer: B. Depth micrometer
Depth micrometers accurately measure depths of slots, holes,
and recesses.
6. A vernier caliper can measure:
A. Only outside dimensions
B. Only inside dimensions
C. Only depth
D. Outside, inside, and depth dimensions
Answer: D. Outside, inside, and depth dimensions
Calipers are versatile tools capable of measuring multiple
feature types.
7. What is the standard reference surface for precision
inspection?
A. Machine table
B. Granite countertop
C. Surface plate
D. Workbench
Answer: C. Surface plate
Surface plates provide an accurate flat reference plane.
, 8. Gauge blocks are primarily used to:
A. Sharpen tools
B. Check machine speed
C. Establish precise known dimensions
D. Measure angles
Answer: C. Establish precise known dimensions
Gauge blocks serve as precision length standards.
9. What does calibration ensure?
A. Faster machining
B. Better tool life
C. Measurement accuracy
D. Reduced setup time
Answer: C. Measurement accuracy
Calibration compares measuring devices to known standards
to ensure accuracy.
10. A dial indicator measures:
A. Temperature
B. Pressure
C. Small dimensional variations
D. Surface hardness
Answer: C. Small dimensional variations
Dial indicators detect minor deviations from a reference
position.
