AIT Measurement Tools 4

Question 1

A metric vernier caliper main scale reads 23 mm and the vernier scale 11th line aligns. With a least count of 0.02 mm, what is the measurement?

Accepted Answer

23.22 mm

Answer

11th vernier line × 0.02 mm = 0.22 mm added to 23 mm gives 23.22 mm.

Question 2

What is the primary advantage of digital calipers over vernier calipers?

Accepted Answer

Elimination of parallax error and easier reading

Answer

Digital calipers eliminate the need to interpret vernier scales, removing parallax errors and reducing reading mistakes.

Question 3

When measuring with an outside micrometer, what is 'feel' or 'touch' referring to?

Accepted Answer

The correct amount of measuring pressure applied through the thimble or ratchet

Answer

Proper measuring feel means applying consistent, light pressure — typically using the ratchet stop to prevent over-tightening.

Question 4

A thickness gauge (feeler gauge) set contains blades of 0.001" to 0.025". To measure a gap of approximately 0.018", which combination is most practical?

Accepted Answer

Stack a 0.015" + 0.005" blade

Answer

0.015" + 0.005" = 0.020" — but if 0.018" exists, that's best; otherwise stacking 0.010" + 0.008" = 0.018" is most accurate.

Question 5

In electrical work, a clamp meter measures current by:

Accepted Answer

Sensing the magnetic field produced by current flowing through a conductor

Answer

A clamp meter uses a current transformer (Hall effect or inductive clamp) to sense the magnetic field around a current-carrying conductor.

(AIT) Apprenticeship and Industry Training Practice Test

(AIT) Apprenticeship and Industry Training Practice Test

AIT Measurement Tools 4