An automotive technician uses a standard 1- to 2-inch outside micrometer to measure the di… — Armed Services Vocational Aptitude Battery (ASVAB)

An automotive technician uses a standard 1- to 2-inch outside micrometer to measure the diameter of a crankshaft connecting rod journal. On the sleeve scale, the major number 6 is visible, along with 3 additional graduation lines past the 6. The thimble bevel aligns precisely with the graduation line 11. What is the total measurement indicated on the micrometer?

A
$1.661\text{ in}$
$1.686\text{ in}$ Answer
C
$1.636\text{ in}$
D
$1.611\text{ in}$

Answer

1.686\text{ in}

The correct reading of

1.686\text{ in}

is found by adding the base frame size (

1.000\text{ in}

), the sleeve major number (

0.600\text{ in}

), the three

0.025\text{ in}

sleeve subdivisions (

0.075\text{ in}

), and the thimble alignment (

0.011\text{ in}

Step-by-Step Solution

Determine the base measurement from the micrometer's specified frame size.

1.000\text{ in}

A 1- to 2-inch micrometer starts at a baseline reading of 1.000 inch when fully closed against its anvil.

Read the exposed major numbered graduations on the sleeve.

6 \times 0.100\text{ in} = 0.600\text{ in}

Each numbered increment on the sleeve represents one-tenth of an inch (0.100 in).

Count the visible minor graduation lines past the major number 6 on the sleeve.

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

Each unnumbered subdivision line on the sleeve represents one revolution of the thimble, equal to 0.025 inch.

Read the thimble scale line that aligns with the sleeve index line.

11 \times 0.001\text{ in} = 0.011\text{ in}

Each line on the rotating thimble represents one-thousandth of an inch (0.001 in).

Sum all four components to determine the final dimension.

1.000\text{ in} + 0.600\text{ in} + 0.075\text{ in} + 0.011\text{ in} = 1.686\text{ in}

Total micrometer measurement equals base length + major sleeve + minor sleeve + thimble reading.

Key Concept

Standard inch outside micrometer scale reading and subdivision calculation

Estimated Time:1m 0s

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