A mechanic uses a standard 0 to 1-inch outside micrometer to measure the diameter of a pis… — Armed Services Vocational Aptitude Battery (ASVAB)

A mechanic uses a standard 0 to 1-inch outside micrometer to measure the diameter of a piston wrist pin. The sleeve reveals the major number 5 along with 3 additional subdivision lines past that number. The thimble index line aligns directly with the number 9. What is the measured diameter of the wrist pin?

A
$0.509\text{ inch}$
B
$0.559\text{ inch}$
$0.584\text{ inch}$ Answer
D
$0.609\text{ inch}$

Answer

0.584\text{ inch}

A standard inch micrometer sleeve is marked in increments of

0.025\text{ inch}

, with numbered lines representing tenths of an inch (

0.100\text{ inch}

). The major line 5 represents

0.500\text{ inch}

, three subdivision marks represent

3 \times 0.025 = 0.075\text{ inch}

, and the thimble reading of 9 represents

0.009\text{ inch}

. Summing these values gives

0.500 + 0.075 + 0.009 = 0.584\text{ inch}

Step-by-Step Solution

Read the largest visible major number on the sleeve scale

Major number

5 = 0.500\text{ inch}

Each numbered division on the sleeve represents tenths of an inch (

0.100\text{ inch}

Count the visible subdivision markings past the major number on the sleeve

3 \times 0.025\text{ inch} = 0.075\text{ inch}

Each small subdivision line between numbers on the sleeve equals

0.025\text{ inch}

Read the graduation line on the thimble aligned with the sleeve datum line

9 \times 0.001\text{ inch} = 0.009\text{ inch}

Each graduation mark on the thimble represents one thousandth of an inch (

0.001\text{ inch}

Sum all three scale components

0.500\text{ in} + 0.075\text{ in} + 0.009\text{ in} = 0.584\text{ inch}

The total measurement is the sum of the major sleeve reading, sleeve subdivisions, and thimble graduation.

Key Concept

Standard Inch Outside Micrometer Reading

Estimated Time:1m 0s

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