The angle measure instrument is independent of specific compactor characteristics, and is useful in comparing the angle between compactors to ensure that specimens of a consistent density are produced.

• A. True
• B. False
• C. It depends on the model
• D. Not used for comparison

Answer: (A)

The angle measure instrument provides a universal, model-independent way to assess how the compactors are oriented and approached during compaction. Because it measures the angle rather than relying on machine-specific features, you can use it to compare the alignment of different compactors. When the measured angle matches the standard, the compaction geometry is consistent, which helps produce specimens with uniform density. Differences in ram speed, pressure, or shoe design between models don’t change the fact that a consistent angle serves as a common reference for achieving repeatable density. So using this instrument to compare the angle between compactors to ensure consistent density is the correct approach.