While servicing an engine cylinder head, a technician measures the outside diameter of an … — Armed Services Vocational Aptitude Battery (ASVAB)

While servicing an engine cylinder head, a technician measures the outside diameter of an intake valve stem using a standard inch micrometer. The sleeve displays the major number $4$ along with $1$ exposed subdivision mark past it. The thimble aligns exactly at graduation $18$ with the sleeve datum line. What is the measured diameter of the valve stem?

A
$0.418\text{ in}$
$0.443\text{ in}$ Answer
C
$0.468\text{ in}$
D
$0.432\text{ in}$

Answer

0.443\text{ in}

On a standard inch micrometer, each major digit on the sleeve represents

0.100\text{ in}

, giving

0.400\text{ in}

. The single visible subdivision adds

0.025\text{ in}

, bringing the sleeve subtotal to

0.425\text{ in}

. Adding the aligned thimble reading of

0.018\text{ in}

yields the exact total measurement of

0.443\text{ in}

Step-by-Step Solution

Read the main numbered graduations on the micrometer sleeve.

4 \times 0.100\text{ in} = 0.400\text{ in}

Each numbered line along the sleeve represents one-tenth of an inch (

0.100\text{ in}

Identify the number of visible subdivision marks past the major number on the sleeve.

1 \times 0.025\text{ in} = 0.025\text{ in}

Each subdivision between major numbers represents one full revolution of the spindle, equal to twenty-five thousandths of an inch (

0.025\text{ in}

Read the graduation on the thimble aligned with the sleeve index line.

18 \times 0.001\text{ in} = 0.018\text{ in}

Each line on the thimble circumference represents one thousandth of an inch (

0.001\text{ in}

Calculate the total measurement by adding all three scale components together.

0.400\text{ in} + 0.025\text{ in} + 0.018\text{ in} = 0.443\text{ in}

The complete reading on a standard outside micrometer is the arithmetic sum of the sleeve reading and the thimble reading.

Key Concept

Standard Inch Outside Micrometer Scale Reading

Estimated Time:45s

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