AIT Measurement Tools 2

Question 1

When using a micrometer, what does one full revolution of the thimble equal on a standard inch micrometer?

Accepted Answer

0.025 inch

Answer

One full revolution of the thimble on a standard inch micrometer advances the spindle 0.025 inch.

Question 2

Which type of square is used to check both 45-degree and 90-degree angles?

Accepted Answer

Combination square

Answer

A combination square has a sliding head that can be set to check both 45-degree and 90-degree angles.

Question 3

A dial indicator reads 0.035 inch. If the needle moves 2 more full revolutions (each revolution = 0.100 inch), what is the total reading?

Accepted Answer

0.235 inch

Answer

Two full revolutions equal 0.200 inch added to the initial 0.035 inch gives 0.235 inch.

Question 4

What tool is best suited for measuring the inside diameter of a large pipe with a diameter over 6 inches?

Accepted Answer

Inside micrometer

Answer

An inside micrometer (tubular or rod type) is designed for measuring large internal diameters directly.

Question 5

What is the purpose of a surface plate in precision measurement?

Accepted Answer

To provide a known flat reference surface for layout and inspection

Answer

A surface plate provides an accurate flat reference datum for layout, inspection, and measurement work.

(AIT) Apprenticeship and Industry Training Practice Test