GATE (TF) Textile 2021 Question Paper Solution | GATE/2021/TF/21

Question 21 (Textile Technology & Fibre Science)

During air-jet weft insertion, if the diameter of the yarn increases by 20 % then the percentage increase in drag force acting on the yarn would be __20___.

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By formula of air jet weft insertion,
Drag force acting on yarn(f)\proptoDiameter of yarn(d)
Given in question, d2=d1+d1*20/100=1.2*d1
Percentage change in drag force(\trianglef)=(d2-d1/d1 )*100
\trianglef=20 % (Answer)

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