Micrometer Quiz
Questions: 16 · 10 minutes
1. How much does each short graduation on the sleeve of a standard imperial micrometer represent?
0.001 inch
0.010 inch
0.100 inch
0.025 inch
2. A metal part is still warm from machining, but a precise micrometer measurement is required. What is the most appropriate approach?
Tighten the ratchet more firmly to offset thermal expansion
Cool only the micrometer before taking the reading
Measure immediately and subtract one thimble division
Allow the part and micrometer to stabilize at the same suitable temperature before measuring
3. What is the correct basic method for reading a standard 0.001-inch imperial micrometer?
Use the thimble value alone whenever its zero is not visible
Add the last visible sleeve value to the aligned thimble value
Subtract the sleeve reading from the thimble reading
Multiply the sleeve value by the aligned thimble number
4. Why should the anvil, spindle face, and workpiece be cleaned before measuring?
Cleaning increases the micrometer's stated resolution
Dirt or debris can add to the measured gap and distort the result
Cleaning resets the sleeve graduations to zero
Debris affects only metric micrometers, not imperial ones
5. What is the main purpose of a micrometer's ratchet stop or friction thimble?
To apply a more consistent measuring force
To lock the spindle at a calibrated zero position
To convert an imperial reading into millimetres
To increase the micrometer's measuring range
6. You need to measure the outside diameter of a shaft expected to be about 1.240 inches. Which tool is the appropriate choice?
A depth micrometer with a 1-inch rod
A 0-1 inch outside micrometer
A 1-2 inch outside micrometer
A 0-1 inch micrometer opened beyond its rated range
7. A micrometer indicates 0.497 inch. If the visible sleeve portion accounts for 0.475 inch, which thimble division must align with the reference line?
Division 2
Division 47
Division 19
Division 22
8. A standard imperial micrometer indicates 0.150 inch. If the spindle is then opened by one complete thimble revolution, what should the new indication be?
0.151 inch
0.175 inch
0.250 inch
0.400 inch
9. A micrometer has a verified positive zero error of 0.002 inch, meaning it reads 0.002 inch when fully closed. It indicates 0.438 inch on a part. What is the corrected measurement?
0.436 inch
0.440 inch
0.438 inch
0.434 inch
10. Which measurement is a standard outside micrometer primarily designed to take?
The internal angle of a tapered bore
The depth of a narrow blind hole
The outside diameter or thickness of a workpiece
The flatness of an entire surface in one reading
11. What can happen if the micrometer is tightened excessively against a workpiece?
The sleeve graduations permanently change their spacing
The micrometer automatically changes to a finer resolution
The workpiece or frame may distort, producing an inaccurate reading or damage
The spindle becomes parallel to the workpiece regardless of alignment
12. A micrometer has a verified zero error of -0.001 inch. If its indicated measurement is 0.250 inch, what is the corrected measurement?
0.249 inch
0.250 inch
0.251 inch
0.252 inch
13. The sleeve shows 0.300 inch plus two additional 0.025-inch graduations. The thimble line aligned with the reference line is 18. What is the reading?
0.368 inch
0.318 inch
0.352 inch
0.480 inch
14. On a standard imperial micrometer graduated to 0.001 inch, how much does one division on the thimble represent?
0.001 inch
0.0001 inch
0.010 inch
0.025 inch
15. The thimble has not yet uncovered the first 0.025-inch sleeve graduation, and thimble division 14 aligns with the reference line. What is the reading?
0.140 inch
0.014 inch
0.0014 inch
0.039 inch
16. What is the purpose of checking a micrometer with a suitable calibrated standard?
To increase the maximum range of the spindle
To determine the surface finish of the workpiece
To convert an outside micrometer into an inside micrometer
To compare its indication with a known dimension and detect error