Question

In fibrograph, 2.5% span length (l) means:

• A. 2.5% of the fibres are shorter than \( l \)
• B. 2.5% of the fibres are longer than \( l \)
• C. 2.5% of the mean length
• D. 2.5% of the effective length

Hint:

The 2.5% span length is often used in quality evaluation of cotton fibres to represent the upper end of the fibre length distribution.

Answer 1

The Correct Option is B

Step 1: Understanding Span Length in Fibrograph.
Span length is a measure of fibre length distribution. In a fibrograph:
- The 2.5% span length is defined as the distance spanned by the longest 2.5% of the fibres.
- This implies that only 2.5% of the fibres are longer than this span length.

Step 2: Interpreting the Definition.
So if 2.5% span length is l, then:
Only 2.5% of fibres are longer than l.