CQI CQI Metrology & Measurement Systems 3

Question 1

What unit is commonly used to express surface roughness in the US?

Accepted Answer

Microinch (µin) or Ra value

Answer

Micron

Answer

Millimeter

Answer

Decibel

Question 2

What does 'Ra' represent in surface finish measurement?

Accepted Answer

The arithmetic average of surface profile deviations from the mean line

Answer

The maximum peak height

Answer

The root mean square roughness

Answer

The maximum valley depth

Question 3

A profilometer is used to measure:

Accepted Answer

Surface texture and roughness

Answer

Part weight

Answer

Internal dimensions

Answer

Material hardness

Question 4

What is the purpose of a coordinate measuring machine (CMM)?

Accepted Answer

To measure three-dimensional geometry of a part against its design specifications

Answer

To measure only surface finish

Answer

To calibrate hand tools

Answer

To measure material hardness

Question 5

On an engineering drawing, a feature control frame is used to specify:

Accepted Answer

Geometric dimensioning and tolerancing (GD&T) requirements

Answer

Material type

Answer

Surface finish only

Answer

Part weight

Question 6

What does a 'flatness' tolerance control in GD&T?

Accepted Answer

How much a surface can deviate from a perfect flat plane, regardless of datum

Answer

The orientation of a surface relative to a datum

Answer

The parallelism of two surfaces

Answer

The perpendicularity of a surface to a datum