Textile Engineering Diploma Interview Questions & Answers | EngineerX
Textile Engineering (Diploma / Polytechnic) Interview Questions & Answers — commonly asked polytechnic diploma interview and campus placement questions with clear, practical answers. Tap any question to open its answer.
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Textile Engineering — Diploma Interview Q&A
Q1What is Textile Engineering?
AnswerTextile Engineering is the branch of engineering concerned with the production and processing of fibres, yarns, fabrics and textile products. It covers processes such as fibre production, spinning, weaving, knitting, dyeing, printing, finishing and garment manufacturing.
Q2What are the major stages of textile manufacturing?
AnswerThe major stages are fibre production or selection, spinning, yarn preparation, fabric formation, wet processing, finishing and garment manufacturing. Depending on the product, some stages may be omitted or performed in a different sequence.
Q3What is a textile fibre?
AnswerA textile fibre is a material having sufficient length, strength, flexibility and other suitable properties to be converted into yarn or used directly in textile applications. Fibres may be natural or man-made.
Q4What are natural fibres?
AnswerNatural fibres are obtained from natural sources such as plants or animals. Cotton, flax, jute and hemp are plant fibres, while wool and silk are examples of animal fibres.
Q5What are man-made fibres?
AnswerMan-made fibres are produced through chemical or industrial processes. They are broadly classified into regenerated fibres, such as viscose, and synthetic fibres, such as polyester, nylon and acrylic.
Q6What is the difference between natural and synthetic fibres?
AnswerNatural fibres originate from plants or animals, whereas synthetic fibres are produced chemically from polymers. Natural fibres often provide good comfort and moisture behavior, while synthetic fibres can offer controlled strength, durability and functional properties.
Q7What is cotton?
AnswerCotton is a natural cellulosic fibre obtained from the seed hairs of the cotton plant. It is widely used because of its comfort, moisture absorbency, softness and suitability for many textile products.
Q8What is the main chemical component of cotton?
AnswerCotton is primarily composed of cellulose, a natural polymer made of glucose units. Cellulose gives cotton its characteristic strength, absorbency and chemical behavior.
Q9What is wool?
AnswerWool is a natural protein fibre obtained mainly from sheep and certain other animals. It has good warmth, elasticity, moisture absorption and insulation properties.
Q10What is silk?
AnswerSilk is a natural protein fibre produced primarily by silkworms. It is known for its high lustre, smooth handle, strength and excellent drape.
Q11What is polyester?
AnswerPolyester is a synthetic fibre generally produced from polymer materials containing ester groups. It is widely used because of its strength, durability, dimensional stability, wrinkle resistance and relatively low moisture absorption.
Q12What is nylon?
AnswerNylon is a synthetic polyamide fibre known for high strength, toughness, abrasion resistance and elasticity. It is used in apparel, hosiery, industrial fabrics, ropes and many technical textile applications.
Q13What is viscose?
AnswerViscose is a regenerated cellulosic fibre produced by chemically processing cellulose and converting it into a spinnable form. It has good softness, drape and moisture absorbency.
Q14What is acrylic fibre?
AnswerAcrylic is a synthetic fibre primarily based on polyacrylonitrile or related copolymers. It is lightweight, warm and often used as a substitute for wool in clothing and household textiles.
Q15What properties are important when selecting a textile fibre?
AnswerImportant properties include fibre length, fineness, strength, elongation, elasticity, moisture regain, abrasion resistance, thermal behavior and chemical resistance. The required properties depend on the intended end use.
Q16What is fibre length?
AnswerFibre length is the physical length of an individual textile fibre. In staple fibres, length strongly influences spinning performance, yarn strength and yarn quality.
Q17What is staple fibre?
AnswerStaple fibre is a fibre available in relatively short lengths rather than as a continuous filament. Cotton, wool and many cut synthetic fibres are staple fibres and must generally be spun to produce yarn.
Q18What is a filament fibre?
AnswerA filament is a continuous fibre that can extend for a very long length. Silk is a natural filament, while polyester and nylon can be manufactured as continuous filaments.
Q19What is fibre fineness?
AnswerFibre fineness describes the thickness or linear density of an individual fibre. Finer fibres can allow production of softer, finer and potentially higher-count yarns, although processing requirements also change.
Q20What is fibre strength?
AnswerFibre strength is the ability of a fibre to resist breaking when subjected to tensile force. Adequate strength is important because fibres undergo considerable mechanical stress during spinning and subsequent textile processing.
Q21What is fibre elongation?
AnswerFibre elongation is the percentage increase in length of a fibre before it breaks when subjected to tensile loading. Appropriate elongation can improve flexibility and resistance to mechanical shocks.
Q22What is moisture regain?
AnswerMoisture regain is the amount of moisture present in a textile material expressed as a percentage of the oven-dry weight. It is important because moisture affects comfort, static electricity, processing behavior and some physical properties.
Q23What is moisture content?
AnswerMoisture content is the mass of moisture expressed as a percentage of the total mass of the moist textile material. It differs from moisture regain because the reference mass is different.
Q24What is spinning in textile manufacturing?
AnswerSpinning is the process of converting staple fibres into a continuous yarn by controlling, drafting and twisting the fibres. It is one of the fundamental processes in textile manufacturing.
Q25What are the main steps in cotton spinning?
AnswerA typical cotton-spinning sequence includes blow room processing, carding, drawing, combing when required, roving and ring spinning. Modern systems may also use open-end or air-jet spinning technologies.
Q26What is a blow room?
AnswerThe blow room is the initial section of a cotton spinning mill where compressed fibre material is opened, cleaned, blended and prepared for carding. Proper blow-room operation helps achieve consistent fibre feed and removes impurities.
Q27What is opening in textile processing?
AnswerOpening is the process of separating compressed fibre tufts into smaller and more individualised fibre groups. It improves cleaning, blending and subsequent processing efficiency.
Q28What is blending of fibres?
AnswerBlending is the controlled mixing of two or more fibre types, varieties or qualities to obtain desired performance and processing characteristics. For example, cotton may be blended with polyester to combine comfort with improved durability.
Q29Why is blending important in textile manufacturing?
AnswerBlending can provide a combination of properties that a single fibre may not provide. It can also help control cost, improve processing behavior and produce specific functional characteristics in the final textile.
Q30What is carding?
AnswerCarding is a key process in which fibres are opened, separated, cleaned and partially aligned to produce a continuous web or sliver. It is often called the foundation of spinning because it strongly influences yarn quality.
Q31What is a carding machine?
AnswerA carding machine contains various rollers and wire-covered surfaces that progressively open, clean and align fibres. It converts the fibre feed into a relatively uniform sliver for subsequent processing.
Q32What is carding sliver?
AnswerCarding sliver is a loose, untwisted strand of relatively parallelized fibres produced by the carding process. It is subsequently processed through drawing and, depending on the spinning system, other preparation stages.
Q33What is neps in cotton?
AnswerNeps are small tangled or immature fibre clusters that can remain in cotton after processing. Excessive neps can negatively affect yarn appearance and fabric quality.
Q34What is drawing in spinning?
AnswerDrawing is the process of combining and attenuating several slivers to improve their evenness and fibre alignment. It reduces mass variation and produces a more uniform sliver.
Q35What is drafting?
AnswerDrafting is the controlled reduction of the linear density of a fibre strand by allowing fibres to move relative to one another through rollers operating at different speeds. It is fundamental to producing yarn of the required fineness.
Q36What is a draw frame?
AnswerA draw frame combines several slivers and drafts them to improve uniformity and fibre parallelization. It plays an important role in controlling yarn quality before subsequent spinning stages.
Q37What is combing in textile spinning?
AnswerCombing is an additional fibre-preparation process used mainly for high-quality yarn production. It removes short fibres, neps and remaining impurities while improving fibre parallelization.
Q38What is comber noil?
AnswerComber noil is the material removed during the combing process, consisting mainly of short fibres, neps and other unwanted matter. Its quantity and quality depend on the fibre and combing settings.
Q39Why is combing used?
AnswerCombing produces a cleaner and more parallel fibre strand with fewer short fibres. This can improve yarn strength, evenness, appearance and suitability for fine-count yarns.
Q40What is roving?
AnswerRoving is a lightly twisted, attenuated strand of fibres produced before certain spinning processes, especially ring spinning. It provides a manageable intermediate material that can be further drafted and twisted into yarn.
Q41What is ring spinning?
AnswerRing spinning is a conventional spinning system in which drafted fibres are twisted and wound onto a rotating bobbin using a traveller-ring arrangement. It can produce strong and fine yarns with good versatility.
Q42What is twist in yarn?
AnswerTwist is the helical arrangement introduced into fibres around the yarn axis. It binds fibres together and contributes significantly to yarn strength, structure and appearance.
Q43What is twist per metre?
AnswerTwist per metre indicates the number of turns introduced into a yarn over one metre of its length. It is an important parameter because yarn properties depend strongly on the amount and direction of twist.
Q44What is S-twist and Z-twist?
AnswerS-twist and Z-twist describe the direction of yarn twist when viewed along the yarn axis. The designation depends on whether the fibres follow a direction resembling the central stroke of the letter S or Z.
Q45What happens if yarn twist is too high?
AnswerExcessive twist can increase yarn strength up to an optimum point, but beyond that it may reduce strength, increase stiffness and affect fabric handle. It can also influence productivity and downstream processing.
Q46What happens if yarn twist is too low?
AnswerLow twist may produce a weak and unstable yarn because the fibres are not sufficiently bound together. Such yarn can show increased hairiness, breakage and processing difficulties.
Q47What is yarn count?
AnswerYarn count is a numerical indication of yarn fineness or coarseness. Different count systems are used, including indirect systems such as English cotton count and direct systems such as tex and denier.
Q48What is Tex?
AnswerTex is a direct yarn linear-density system. One tex represents one gram of mass per 1,000 metres of yarn; therefore, a higher tex value indicates a heavier or coarser yarn.
Q49What is Denier?
AnswerDenier is a direct linear-density system commonly used for filament and synthetic fibres. One denier represents one gram per 9,000 metres of material, so a higher denier indicates greater linear density.
Q50What is the difference between Tex and Denier?
AnswerBoth are direct systems of linear density, but their reference lengths are different. Tex is grams per 1,000 metres, whereas denier is grams per 9,000 metres; therefore, 1 denier = 0.1111 tex approximately.
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