GATE 2017-2018 :: GATE Textile and Fibre
- Sizing of single cotton yarn leads to an increase in
- The strength utilization of yarn in a woven fabric is
- Yarns Y1 and Y2 have the same strength when tested at 200 mm gauge length. If mass unevenness CV (%) of yarns Y1 and Y2 are 10 and 20 respectively, the ratio of the strength of yarns Y1 and Y2 when tested at 500 mm gauge length is
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Consider the following Assertion [a] and Reason [r] [a] In the case of dyeing of cotton with reactive dyes, formation of hydrolyzed dye is a major problem.[r] In an alkaline medium, the reactive dye reacts with the hydroxyl groups irrespective of whether these are from cellulose or water.Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
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Consider the following Assertion [a] and Reason [r] [a] In the case of durable press finishing of cotton fabrics, while the citric acid can be used as a crosslinking agent, oxalic acid cannot be.[r] The mechanism of crosslinking requires formation of anhydride in the intermediate step.Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
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Consider the following Assertion [a] and Reason [r] [a] In the case of minimum application technique, compared to the conventional rolls of a typical padding mangle, Roberto rolls substantially reduce the wet pick up.[r] The Roberto rolls are connected to vacuum pump to facilitate removal of liquor from the fabric.Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
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Four polyester and four cotton carded slivers of the same count and mass CV of 4.16 % are drawn together keeping a draft of 8 on a breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe. The polyester (%) in the final sliver is approximately
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Four polyester and four cotton carded slivers of the same count and mass CV of 4.16 % are drawn together keeping a draft of 8 on a breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe.The mass CV (%) of the final sliver is approximately
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A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibre density. The fabric has 30 ends per cm and 25 picks per cm. Assume that warp is jammed.The thickness of the above fabric (mm) is approximately
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The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005Ï + 0.15/Ïwhere λ is the thermal conductivity of the fabric in W/(mâ‹…K), Ï is the bulk density of the fabric in kg/m3, and Ï∈[10,200].Thermal conductivity is minimum when the bulk density is approximately
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A.
Strength and extensibility but decrease in bending rigidity and hairiness
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B.
Strength and bending rigidity but decrease in extensibility and hairiness
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C.
Strength and hairiness but decrease in extensibility and bending rigidity
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D.
Bending rigidity and extensibility but decrease in strength and hairiness
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