Fibre science basics: choose the incorrect statement among the following.

Introduction / Context:Fibre terminology covers fineness units, crimp, spinning methods, and moisture regain. This question tests familiarity with definitions and common manufacturing routes for important synthetic and regenerated fibres.

Given Data / Assumptions:

• Dacron (PET) is typically melt-spun.
• Acrylics can be dry- or wet-spun depending on solvent systems.
• Viscose rayon is wet-spun via coagulation in a bath.
• Cellulose acetate is often dry-spun.

Concept / Approach:The incorrect statement is the one claiming all listed fibres are wet-spun. In fact, PET is a melt-spun polyester; cellulose acetate commonly uses dry spinning; acrylics may use dry or wet depending on the process. Only viscose rayon is consistently wet-spun among those listed. Denier and tex definitions are standard, and nylon's moisture absorption exceeds that of low-moisture-regain polyester.

Step-by-Step Solution:Confirm denier/tex definitions → correct.Confirm crimp description → correct.Evaluate spinning methods: statement grouping all as wet-spun → incorrect.Check moisture: nylon > polyester → statement correct.

Verification / Alternative check:Process charts show PET melt spinning, cellulose acetate dry spinning, viscose wet spinning; acrylics vary.

Why Other Options Are Wrong:They are correct statements; only the spinning-route claim is broadly incorrect.

Common Pitfalls:Assuming all solution-spun fibres are wet-spun; overlooking dry spinning of acetates and some acrylics, and melt spinning of PET.

Final Answer:Dacron, acrylic, viscose rayon, and cellulose acetate fibres are all prepared by wet spinning.