AIT Measurement Tools 3

Question 1

A steel rule graduated in 1/64-inch increments is used to measure a part. What is the smallest increment that can be directly read?

Accepted Answer

0.015625 inch

Answer

1/64 inch equals 0.015625 inch, which is the finest graduation on that rule.

Question 2

When a feeler gauge blade drags with slight resistance when pulled from between two surfaces, this indicates the gap equals what?

Accepted Answer

The nominal thickness of that blade

Answer

A slight drag means the gap matches the nominal thickness of the feeler blade being used.

Question 3

What is the function of the datum line on a vernier caliper scale?

Accepted Answer

It is the reference line from which both main scale and vernier readings are taken

Answer

The datum (index) line on the vernier scale aligns with the main scale to provide the reference for reading.

Question 4

In pipe fitting, a pipe wrap or circumference tape is used primarily to:

Accepted Answer

Find the center for a cut by wrapping around the pipe circumference

Answer

A pipe wrap (wraparound) provides a straight reference line around a pipe's circumference to mark a square cut line.

Question 5

A bore gauge is set using an outside micrometer before use. Why?

Accepted Answer

To set the bore gauge to a known dimension so it reads deviation from that size

Answer

Setting the bore gauge against a micrometer at the nominal size allows it to show plus or minus deviation from that dimension.

(AIT) Apprenticeship and Industry Training Practice Test