JNTU
JNTU B.Tech II YARN MANUFACTURE - I Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Mention the input package form and out package form for each process stage of Ring spinning.
Answer
The process stages in ring spinning are: Blowroom (Input: Bales, Output: Lap/Tufts), Carding (Input: Lap/Tufts, Output: Sliver), Drawing (Input: Sliver, Output: Drawn Sliver), Simplex/Speed Frame (Input: Drawn Sliver, Output: Roving), and Ring Frame (Input: Roving, Output: Yarn on Bobbin).
Draw a simple sketch of Saw ginning machine, mention the main parts and state the working principle of ginning.
Answer
A saw gin consists of a feed hopper, a seed cotton roll box, a series of circular saws mounted on a shaft, and a doffing brush. The working principle involves the saws pulling lint through a grid (ribs) that prevents seeds from passing, while the seeds are retained in the roll box until they are cleaned and discharged.
What is the purpose of Grid bars? Draw a simple sketch showing grid bar arrangement for cleaning machine.
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What are the uses of bypass arrangement in a blow room line?
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List various ancillary equipment used in Blowroom?
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What are different types of material feeding to the blow room machines?
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What are the objectives of carding process?
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What are the factors that help transfer of fibres from licker in to Cylinder?
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State the importance of stop motions on a carding machine.
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Find the production (in Kgs) of a Carding machine per a shift of 8 hours from the following particulars: Coiler calendar speed: 150 rpm, Coiler calendar diameter: 2.2 inches, Hank of sliver: 0.16, Efficiency: 90 %.
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Part B
Classify filament yarns into different categories.
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Explain the parameters which govern the selection of Cotton before making into yarn.
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Classify staple fibre spun yarns into different categories.
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Explain the working principle of Mixing Bale opener using a simple diagram.
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What are the objectives of Blow room?
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Explain the types of opening devices by using simple diagrams.
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Explain different procedures followed for mechanical cleaning in Blow room.
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Explain the working principle of Mono Cylinder using a simple sketch.
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Explain the purpose of cone drum mechanism in a blowroom.
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Explain the working principle of Air flow cleaner.
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Explain the importance of Metal extractors in a blowroom.
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Explain the working principle of Kirshner beater.
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Explain different types of grinding in carding department.
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Draw the simple sketch of carding machine and mention the setting points.
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Explain the parts and functions of Cylinder region of a card.
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Explain about card clothing on a carding machine.
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Explain about latest developments in cylinder region of a card.
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Explain about Tandem carding process.
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Explain how Coiler mechanism works on a carding machine.
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Write the Causes and remedies for Sliver count variation.
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