Millwright Certification Precision Measuring and Layout 2

Question 1

What is the resolution of a standard metric outside micrometer with a thimble graduated in 0.01 mm divisions?

Accepted Answer

0.01 mm

Answer

0.1 mm

Answer

0.001 mm

Answer

1.0 mm

Question 2

When using a dial indicator to check shaft runout, what does a Total Indicator Reading (TIR) of 0.05 mm mean?

Accepted Answer

The maximum indicator deflection from lowest to highest reading during one full rotation is 0.05 mm

Answer

The shaft is 0.05 mm oversize

Answer

The shaft needs to be 0.05 mm smaller

Answer

The dial indicator has 0.05 mm of error

Question 3

What is the proper technique for measuring with a telescoping gauge?

Accepted Answer

Compress, insert into the bore, lock at the correct contact feel, then measure the gauge with a micrometer

Answer

Insert the gauge and read the measurement directly from the scale

Answer

Place the gauge on a surface plate and compare to gauge blocks

Answer

Use the gauge as a go/no-go checker

Question 4

Why must precision measuring instruments be allowed to equalize to the same temperature as the workpiece before measuring?

Accepted Answer

Thermal expansion causes dimensional changes that create measurement errors

Answer

To prevent rust formation

Answer

To ensure the display is readable

Answer

To prevent damage to the instrument

Question 5

What is a surface plate used for in precision layout and measurement?

Accepted Answer

As a flat reference plane for layout work, height measurements, and checking flatness of components

Answer

As a welding table

Answer

As a storage shelf for tools

Answer

As a vibration dampener for machinery

Question 6

When using vernier calipers, what is the most common source of measurement error?

Accepted Answer

Excessive jaw pressure causing deflection, or not measuring at the correct point on the jaws

Answer

The vernier scale being too small to read

Answer

Ambient noise interfering with the reading

Answer

The caliper being too heavy to hold steady