Question 11. The winding speed (difference between bobbin speed and traveller speed) of yarn in a ring frame is
200 rev/min when bobbin diameter is 28 mm. If the bobbin diameter is increased to 35 mm, the
winding speed (rev/min) would be

Question 12. Consider the following Assertion [a] and Reason [r] [a] In the case of manufactured fibre spinning, a circular spinneret orifice always results in circular
cross-section of filaments in melt spinning, but the same is not true in dry spinning. [r] Melt spinning involves only heat transfer, whereas dry spinning involves heat as well as mass
transfer. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]

Question 13. The weight of material on a roving bobbin is 2.4 kg. The roving hank is 600 tex. If delivery rate is
20 m/min, the time (min) required to build the bobbin is

Question 14. The fibre that contains nitrogen and sulfur is

Question 15. Condensation polymerization is not used to produce

Question 16. Surface features of a fibre can be obtained by

Question 17. The fibre that dissolves in 59% (w/w) sulfuric acid solution is

Question 18. Wet spinning technique is commercially used to produce filament yarn of

Question 19. Birefringence of filament yarn is related to its

Question 20. Softer cots on drafting rollers result in