Food and Nutrition- ICAR JRF/SRF 2024

• Structural Characteristics of Single Jersey Weft Knits:
• Single Jersey (Plain Knit):
• Produced on a single set of needles in circular or flat knitting machines.
• Characterized by distinct vertical columns of stitches called wales on the technical face (smooth V-shapes) and horizontal rows of semicircular stitch loops called courses on the technical back.
• Comparison:
• Rib knit: Shows alternating vertical wales on both face and back.
• Double knit: Uses two needle beds, identical smooth appearance on both sides.
• Conclusion: Jersey (Option 1).

Correct option: (1) Jersey

• Classification of Basket Weave Fabrics:
• Basket Weave: A derivative of plain weave where two or more warp yarns interlace with two or more filling yarns as a group ($2 \times 2$, $3 \times 3$, or $2 \times 1$).
• Oxford Cloth: A classic modified basket weave fabric (usually a $2 \times 1$ basket weave with two fine warp yarns woven with one heavier soft-spun filling yarn), providing a porous, breathable, textured hand for shirting.
• Other Fabrics:
• Taffeta: Crisp balanced plain weave.
• Rep: Rib weave with crosswise cords.
• Sharkskin: Twill or plain weave with twill diagonal appearance.
• Conclusion: Oxford cloth (Option 4).

Correct option: (4) Oxford cloth

• Manufacture of Synthetic and Regenerated Fibers via Dry Spinning:
• Dry Spinning Process:
• The fiber-forming polymer is dissolved in a volatile organic solvent (e.g., cellulose acetate dissolved in acetone).
• The polymer dope is extruded through spinneret orifices into a vertical spinning tower where a counter-current stream of warm air evaporates the solvent, solidifying continuous filaments.
• Comparison of Spinning Systems:
• Dry spinning: Cellulose Acetate, Spandex, Acrylic.
• Melt spinning: Nylon, Polyester, Polypropylene.
• Wet spinning: Viscose Rayon, Cuprammonium Rayon.
• Conclusion: Acetate (Option 1).

Correct option: (1) Acetate