CH4 Measurement of Geometrical Features

What does flatness measure?

• The angle between two surfaces

• The distance between two points

• Deviation of a surface from a perfectly flat plane

• The diameter of a circular part

Which of the following is not a method to measure flatness?

• Using three reference points

• Measuring deviation from a laser plane

• Using two perpendicular datums

• Measuring on a circular flange with 120° pitch

Straightness tolerance is represented by a zone formed by:

• Two concentric circles

• Two parallel planes

• A cylinder

• Two parallel lines

What is the correct tool to measure perpendicularity in machine tools?

• Sine bar

• Master square

• Dial caliper

• Vernier protractor

What does parallelism tolerance control?

• Squareness between two surfaces

• Uniformity of thickness

• Equidistant relationship from a datum

• Surface roughness

Which equipment is commonly used for checking roundness?

• Sine bar

• Penta prism

• Talyrond 265

• Protractor

In roundness measurement, how many concentric circles define the tolerance zone?

• One

• Two

• Three

• Four

Cylindricity tolerance applies to:

• Both circular and longitudinal elements

• Only the circular profile

• Flat surfaces only

• Angular surfaces

Which feature is defined as the condition of a surface or axis at a specified angle (≠ 90°) to a datum?

• Flatness

• Angularity

• Parallelism

• Symmetry

Symmetry tolerance is defined by:

• Two circles

• A cone and a cylinder

• A square tolerance zone

• Two parallel planes centered about a median plane