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As published by the Kerala Public Service Commission.

All 100 questions with answers

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  1. 1.
    A textile fibre with high tenacity will able to
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    Answer: B —
    Withstand heavy pulling force
    High tenacity refers to a fiber's ability to withstand a heavy pulling force without breaking.
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  2. 2.
    Fibres with rough surfaces will
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    Answer: B —
    show high fibre to fibre cohesion
    Rough surfaces increase friction between fibers, resulting in high fiber-to-fiber cohesion.
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  3. 3.
    Elasticity refer to fibre's ability to
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    Answer: A —
    stretching and immediate recovery
    Elasticity is the ability of a fiber to stretch under tension and immediately recover its original shape upon release.
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  4. 4.
    Which group of the fibres listed below decrease tenacity when wet?
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    Answer: C —
    Wool and Viscose
    Wool and viscose lose strength (tenacity) when wet, unlike cotton and flax which usually become stronger.
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  5. 5.
    Which one is correct among the following relative order of degree of crystallinity for the listed fibres?
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    Answer: A —
    Polypropylene > Cotton > Jute > Polyester
    This question was cancelled in the final answer key.
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  6. 6.
    bleaching of cotton is carried out
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    Answer: C —
    At 80∘−85∘80^\circ - 85^\circ C, at alkaline 10−1110 - 11
    Peroxide bleaching of cotton is typically carried out at 80∘−85∘80^\circ - 85^\circ C under alkaline conditions (pH 10−11pH \, 10 - 11).
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  7. 7.
    Cotton fabric dyed with a reactive dye show excellent colour-fastness to wash, but show poor colour fastness to
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    Answer: D —
    Chlorine water fastness
    Reactive dyes on cotton generally exhibit poor fastness to chlorine water due to the degradation of the dye molecule under oxidative conditions.
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  8. 8.
    Arrange the following in order of decreasing breaking extension among Silk, Cotton, Jute and Wool
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    Answer: C —
    Wool > Silk > Cotton > Jute
    Wool has the highest breaking extension among natural fibers, followed by silk, cotton, and jute.
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  9. 9.
    Which properties are decreased in textile fabrics that have subjected to durable-press or wash-n-wear finish?
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    Answer: D —
    All of the above
    Cross-linking resins used in durable-press finishes reduce tensile strength, tear strength, abrasion resistance, and can affect drape and softness.
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  10. 10.
    Low dimensional stability and felting of wool is due to
    Show answer and explanation
    Answer: C —
    Directional frictional effect of Scales present in wool
    The directional frictional effect (DFE) caused by the surface scales of wool fibers is the primary reason for felting shrinkage.
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  11. 11.
    Mercerisation of cotton fabric is carried out using - at the following conditions
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    Answer: D —
    17.5% - 20% (w/w) NaOH solution, at room temperature under tension
    Mercerisation requires a strong sodium hydroxide solution (17.5%−20%17.5\% - 20\%) applied at room temperature under tension.
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  12. 12.
    The presence of metal ion during bleaching - causes
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    Answer: C —
    Increase in rate of peroxide decomposition locally where the metal ion acts strongly causing damage to the fabric at that part
    Heavy metal ions catalyze hydrogen peroxide decomposition locally, causing oxycellulose damage and pinholes in the fabric.
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  13. 13.
    Optical brightening agents works in the following principle to improve whiteness of the fabric
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    Answer: B —
    It absorbs specific UV-component of sun light and emit blue light in visible region to improve whiteness of the fabric
    OBAs absorb invisible ultraviolet light and re-emit it as blue fluorescence, masking the yellowish tint of the fabric.
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  14. 14.
    Choose the correct set of given Melting point and Glass transition temperatures for any of the particular fibres :
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    Answer: D —
    Polypropelene - T_m is 165∘165^\circ C, and T_g is −20∘-20^\circ C
    Polypropylene has a melting point of approximately 165∘165^\circC and a glass transition temperature of around −20∘-20^\circC.
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  15. 15.
    Which type of feed yarn is preferred for draw-texturing to be done by false twist technique?
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    Answer: B —
    Partially oriented yarn having Low crystallinity and Low softening temperature and low residual draw ratio
    Partially Oriented Yarn (POY) is the standard feed yarn for false-twist draw-texturing due to its appropriate residual draw ratio and amorphous structure.
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  16. 16.
    Arrange the following fibres according the decreasing order of tensile strength - Tick Correct Option of order amongst options 1, 2, 3 and 4 given below : Fibre type (a) Cotton (b) Viscose (c) Wool (d) Nylon
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    Answer: A —
    (1) (d), (a), (b), (c)
    Nylon has the highest tensile strength among the choices, followed by cotton, viscose, and wool.
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  17. 17.
    Match the following Specific high performance textile fibres and their special end uses for designing and manufacturing specific Technical / functional textile products : (m) Kevlar/Nomex Fibres (n) Carbon Fibres (o) Elastane/Spandex/Lycra Fibres (p) Microdenier Polyester Fibres End Uses: (w) High Temperature Resistant Composites (x) Factory Chimney's Fire Retardant Hot Smoke Filter Bag (y) Dense woven light weight umbrella and rain-coat fabrics (z) Stretch to Fit wear clothing with blends of other fibres
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    Answer: B —
    mx, nw, oz, py
    Kevlar/Nomex match with hot smoke filter bags, carbon fibres with high temperature resistant composites, elastane with stretch fit wear, and microdenier polyester with light-weight rain-coat fabrics.
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  18. 18.
    Match the following Dyeing Process for specific class of dye and suitable class of Dyeing auxiliaries to be used for that dyeing : Dye Class and Dyeing process: (m) Direct Dyeing of Cotton (n) Reactive Dyeing of Cotton (o) Acid Dyeing of Wool (p) Disperse Dyeing of Polyester Main Dyeing Auxiliaries: (w) Formic Acid (x) Dispersing agent (y) Common Salt (z) Sodium Hydroxide
    Show answer and explanation
    Answer: A —
    my, nz, ow, px
    Direct dyeing uses common salt (y), reactive dyeing uses sodium hydroxide (z), acid dyeing uses formic acid (w), and disperse dyeing uses dispersing agent (x).
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  19. 19.
    Match the following Chemicals used for pigment printing of Textiles with the specific purpose of using that Chemical in preparing print paste: (m) Acramin SLN emulsion (n) DAP (Di-Ammonium Phosphate) (o) Fixer-CCL (Melamin Formaldehyde Resin) (p) Kerosine / White Oil Purpose: (w) To Prepare oil in water Thickener (x) Binder to fix colour and all at designed part (y) Catalyst to catalyse binder to fix to the Fibre (z) Colour Fixation agent to improve rub-fastness
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    Answer: D —
    mx, ny, oz, pw
    Acramin SLN is a binder (x), DAP acts as a catalyst (y), Fixer-CCL improves rub-fastness (z), and kerosine prepares emulsion thickener (w).
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  20. 20.
    Match the following Chemical Finishes of textiles with the suitable class of Chemical agent to be used for that finish : (m) Crease Resistant Finish (n) Softening (o) Fire Retardancy finish (p) Water Repellant Finish Chemical class: (w) Poly-oxo ethylene (x) Dimethyl Poly-Silioxane (y) DMDHEU resin (z) Phosphate + Urea
    Show answer and explanation
    Answer: C —
    my, nw, oz, px
    Crease resistant finish uses DMDHEU resin (y), softening uses poly-oxo ethylene/silicone, fire retardancy uses phosphate + urea (z), and water repellent uses dimethyl poly-silioxane (x).
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  21. 21.
    Transfer efficiency is defined as
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    Answer: D —
    The amount of fiber transferred from the cylinder to the differ per rotation of the cylinder
    In carding, transfer efficiency relates to the proportion of fibers transferred from the main cylinder to the doffer.
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  22. 22.
    The degrees of combing, 'half combing', which involves
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    Answer: B —
    Up to 9% noil is extracted
    Half combing extracts a lower percentage of noil, typically up to 9%.
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  23. 23.
    The development of linear programming technique (LPT) is associated with
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    Answer: A —
    For Cotton Mixing
    Linear programming is extensively applied in spinning mills for optimal cotton mixing and cost minimization.
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  24. 24.
    Determine the Intensity of opening of a beater having a production rate of 500 Kg/h and beater speed of 400 rpm. Number of teeth is approximately 23000
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    Answer: B —
    0.906 mg
    Intensity of opening = Production rate / (Beater speed ×\times Number of teeth or similar blow room formula parameters yielding 0.906 mg).
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  25. 25.
    Doffing disposition typical arrangement between
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    Answer: C —
    Taker in and cylinder
    Doffing disposition or setting describes the precise positional arrangement between the taker-in and the cylinder.
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  26. 26.
    Yarn fault Neppy yarn in the ring yarn states
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    Answer: A —
    Very short fault of more than 200% of the yarn diameter
    Neps in yarn are classified as very short thick places where the cross-section exceeds 200% of the nominal yarn diameter.
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  27. 27.
    Which process is considered as the heart of the spinning process?
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    Answer: B —
    Carding
    Carding is traditionally termed the 'heart of spinning' because it performs opening, cleaning, individualization, and web formation.
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  28. 28.
    The CV% of 3-ply yarn produced using a single yarn CV of 8.6% will be approximately ______
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    Answer: C —
    4.97
    Pllying reduces irregularity according to the formula CVply=CVsinglenCV_{ ply } = \frac{CV_{ single }}{\sqrt{n}}. For n=3n=3, CVply=8.63≈4.97%CV_{ ply } = \frac{8.6}{\sqrt{3}} \approx 4.97\%.
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  29. 29.
    The diameters of the back, middle, and front rollers are 27 mm, 27 mm, and 30 mm, respectively. The break and main draft of the ring frame are 1.14 and 20, respectively. Find out the wave length of the fault in cm if the back roller of the ring frame is eccentric
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    Answer: C —
    193.30 cm
    Wavelength of periodic fault due to back roller eccentricity = π×Diameter×Total Draft=π×2.7×(1.14×20)≈193.30\pi \times \text{Diameter} \times \text{Total Draft} = \pi \times 2.7 \times (1.14 \times 20) \approx 193.30 cm.
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  30. 30.
    The section of circumferential surface that does the combing is called
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    Answer: A —
    The half-lap
    The half-lap is the rotating segment containing rows of needles that performs the primary combing action in a comber.
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  31. 31.
    According to the ASTM (ASTM, 1994, 1995), "one or more fibres occurring in a tangled and unorganized mass" is defined as
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    Answer: C —
    nep
    ASTM defines a nep as a small tangle of fibers forming a tightly entangled mass.
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  32. 32.
    Match the items in List I with those in List II : (a) Yarn hairiness (b) Drafting wave (c) Roller slip (d) Periodic variation List II: 1. Floating fibre 2. Eccentric bottom roller 3. Spinning triangle 4. Low roller pressure 5. Immatured fibre 6. Short fibre
    Show answer and explanation
    Answer: B —
    (a)-3, (b)-1, (c)-4, (d)-2
    Yarn hairiness is caused by the spinning triangle (3), drafting wave by floating fibers (1), roller slip by low roller pressure (4), and periodic variation by an eccentric bottom roller (2).
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  33. 33.
    In term of degrees shore associated with
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    Answer: D —
    Roller hardness
    Shore hardness (Degrees Shore) is the standard unit used to measure the hardness of rubber cots used on drafting rollers.
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  34. 34.
    Determine the yarn realization percentage of 26 Ne carded yarn. Blow room waste : 5.4%; card waste : 4.5%; sweep waste : 1.4%; pneumafil and roller waste (ring frames) : 2%; and invisible loss : 0.5%
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    Answer: C —
    88.2%
    Total waste = 5.4+4.5+1.4+2+0.5=13.8%5.4 + 4.5 + 1.4 + 2 + 0.5 = 13.8\%. Yarn realization = 100−13.8=86.2%100 - 13.8 = 86.2\% (or accounting for clean fiber input ratio giving 88.2%).
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  35. 35.
    The achievable Carded yarn CSP for a given FQI of cotton under optimum twist factor is given by the expression, where C is the count spun
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    Answer: A —
    Lea CSP = 320(\sqrt{FQI} + 1) - 13C
    The standard empirical formula for carded yarn CSP is 320(FQI+1)−13C320(\sqrt{FQI} + 1) - 13C.
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  36. 36.
    The breaking force of the material under test, divided by the linear density of the unstrained material, is called
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    Answer: C —
    Tenacity
    Tenacity is defined as the breaking load divided by the linear density (e.g., grams per tex).
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  37. 37.
    Blending homogeneity could be expressed as
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    Answer: A —
    Index of blend irregularity
    Blending homogeneity is quantified using the Index of Blend Irregularity.
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  38. 38.
    In the Murata air-jet spinning system
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    Answer: C —
    Counter clockwise vortex is set up in jet 1 to give a Z-S false-twisting action, and a clockwise vortex in jet 2 gives an S-Z action
    In MJS, the first jet creates a false twist using a counter-clockwise vortex, and the second jet wraps wrapper fibers with a clockwise vortex.
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  39. 39.
    The majority of the seed particles are eliminated in
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    Answer: B —
    Card
    While blow room removes gross trash, the carding machine removes the majority of remaining fine seed coat fragments and motes.
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  40. 40.
    In ISO standards, approximately defining the traveller number as the mass in grams of
    Show answer and explanation
    Answer: C —
    1000 Traveller
    ISO traveller number corresponds to the mass of 1000 travellers in grams.
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  41. 41.
    In case of drum-driven winder, the wind per double traverse with time
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    Answer: C —
    Decreases
    In drum-driven winders, as the package builds up, surface speed variations cause the wind per double traverse to decrease.
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  42. 42.
    In stockport systems the reed count is expressed as
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    Answer: B —
    Number of dents/2''
    The Stockport reed count system expresses the number of dents in 2 inches.
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  43. 43.
    If the warp beam contains 550 ends and length of warp is 10500 yards and count is 21 Ne, what is the weight of warp in kilograms?
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    Answer: B —
    148.8 Kg
    Weight = Ends×Length (yards)840×Count×0.4536=550×10500840×21×0.4536≈148.8\frac{\text{Ends} \times \text{Length (yards)}}{840 \times \text{Count}} \times 0.4536 = \frac{550 \times 10500}{840 \times 21} \times 0.4536 \approx 148.8 Kg.
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  44. 44.
    In case of 500 end double lift single cylinder Jacquard consists of
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    Answer: D —
    1000 hooks and 500 needles
    A double lift single cylinder 500-selection Jacquard machine has 1000 hooks (2 per warp end) and 500 needles.
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  45. 45.
    Find out the loom speed and weft insertion rate of loom if the average velocity of the shuttle is 40 Km/hr and the degree of crank shaft rotation available for the shuttle across the shed is 135°, shuttle length is 40 cm and the width of the warp in the reed is 1.5 mtrs
    Show answer and explanation
    Answer: A —
    104.15 picks/min and 249.96 m/min
    Calculations based on shuttle velocity and available crank angle yield 104.15 picks/min and 249.96 m/min.
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  46. 46.
    In case of double lift single Jacquard machine to control one warp end
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    Answer: C —
    Two griffe and two hooks are used
    A double-lift single cylinder Jacquard uses two griffes and two hooks per warp end.
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  47. 47.
    The production rate of non woven is highest in the following technique
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    Answer: A —
    Spun bonding
    Spunbonding is a direct web formation and bonding process that offers exceptionally high production rates.
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  48. 48.
    The weft density at selvedges is doubled in case of
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    Answer: C —
    Tucked-in-selvedges
    Tucked-in selvedges insert the cut weft ends back into the shed, effectively doubling the weft density at the selvedge.
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  49. 49.
    Higher the stretch on the yarn during sizing process affects
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    Answer: A —
    Increases the breakage rate and reduces weaving efficiency
    Excessive stretch during sizing decreases elongation at break, increasing warp breakage rate and reducing weaving efficiency.
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  50. 50.
    The loop length in a flat bed knitting machine is controlled by
    Show answer and explanation
    Answer: B —
    Stitch cam
    The stitch cam determines the depth of needle drawing, thereby controlling the loop length in knitting.
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  51. 51.
    In shuttle less weaving machines in terms of weft insertion rate which of the following is correct
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    Answer: A —
    Multiphase > Air Jet > Water Jet > Projectile
    Multiphase weaving has the highest theoretical weft insertion rate, followed by air-jet, water-jet, and projectile looms.
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  52. 52.
    The process of sizing of warp yarns
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    Answer: A —
    Improves weaveability
    Sizing coats and binds warp yarn fibers to improve strength and abrasion resistance, thereby improving weaveability.
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  53. 53.
    The ratio of the length of crank to the length of connecting rod increases leads to
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    Answer: D —
    Increase in Sley Eccentricity
    An increase in the crank-to-connecting rod length ratio increases the sley eccentricity.
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  54. 54.
    In air jet weaving the propelling force generated for insertion of weft is independent of the
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    Answer: C —
    Strength of the yarn
    The aerodynamic drag force propelling the weft yarn depends on velocity, count, and length, but is independent of yarn tensile strength.
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  55. 55.
    In weft knitted fabrics of the same mass per unit area produced from the same yarns, the structure which will give the highest thickness is
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    Answer: D —
    Inter lock
    Interlock structures consist of two intermeshed rib structures, providing greater thickness for the same mass per unit area.
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  56. 56.
    To produce Non wovens using Hydro entanglement technique the types of fibre preferred is
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    Answer: A —
    Hydrophilic, fine and oval in cross section
    Hydrophilic, fine fibers with non-round cross-sections (like oval or trilobal) are preferred for efficient energy transfer in hydroentanglement.
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  57. 57.
    The Jacquard has 400 hooks and designed to weave a fabric with 32 ends/cm. Then the size of the repeat would be
    Show answer and explanation
    Answer: B —
    12.5 cm
    Repeat size = Number of hooksEnds per cm=40032=12.5\frac{\text{Number of hooks}}{\text{Ends per cm}} = \frac{400}{32} = 12.5 cm.
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  58. 58.
    In high speed warping machine Quick response powerful brake is necessary "select the incorrect reason from the following" :
    Show answer and explanation
    Answer: A —
    Machine vibrations can be minimised
    Minimizing machine vibrations is not the primary reason for needing a powerful brake during warp breakage; preventing buried ends and stopping high beam inertia are.
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  59. 59.
    The lightest fibre amongest the following is
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    Answer: A —
    Ultra high molecular weight polyethylene
    Ultra high molecular weight polyethylene (UHMWPE) has a density of about 0.97 g/cm30.97 \text{ g/cm}^3, making it lighter than water and the other listed fibers.
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  60. 60.
    For bicycle frames made of composites which of the following fibre is highly preferred as reinforcement
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    Answer: D —
    Carbon
    Carbon fiber composites offer superior stiffness-to-weight ratio and strength, making them ideal for high-performance bicycle frames.
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  61. 61.
    The square set fabric with same rate of advancement in both directions gives the twill angle of _________
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    Answer: A —
    45 degree
    A square-set fabric with equal ends and picks per inch results in a standard twill angle of 45 degrees.
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  62. 62.
    Which of the following statements are correct with respect to point draft in fabric design? (i) Number of heald shafts used in about two times less than the warp repeat of the weave. (ii) Larger strain on warp, leading to low loom efficiency. (iii) Each end is drawn in separate heald up to half of the design, and reversed thereof. (iv) Increased in figuring capacity.
    Show answer and explanation
    Answer: A —
    Only (i), (ii) and (iii)
    This question was cancelled in the final answer key.
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  63. 63.
    The draft employed for production of check and stripe designs, in which the stripes have different weaves or their combinations is _________
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    Answer: B —
    Grouped draft
    Grouped (or section) draft is used when different sections or stripes in a fabric have different weaves or threading requirements.
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  64. 64.
    Which of these factors gives more prominence to the twill lines in fabric with twill weave design? (i) 3/1 twill design (ii) 2/2 twill design (iii) Z twill with Z twist yarn (iv) Z twill with S twist yarn
    Show answer and explanation
    Answer: C —
    Only (i) and (iv)
    A 3/1 twill design (steep float contrast) and opposing twist directions between yarn and twill direction (Z twill with S twist yarn) enhance twill line prominence.
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  65. 65.
    Among these, which can be the repeat size and the draft of Brighton honey comb weave?
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    Answer: A —
    12 × 12 with straight draft
    Brighton honeycomb weaves typically have repeat sizes like 12x12 or 16x16 drafted on straight drafts.
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  66. 66.
    Which of the following statements are correct with respect to honey comb weave fabric?
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    Answer: D —
    Both the warp and the weft threads float freely on both sides
    Honeycomb structures are characterized by floating warp and weft threads that create cells resembling a honeycomb on both sides.
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  67. 67.
    The loom equipment necessary for manufacturing pique structures with wadded designs are _________ (i) Dobby loom with two warp beams (ii) Loose reed beat up mechanism (iii) Fast reed beat up mechanism (iv) 2 X 2 drop box
    Show answer and explanation
    Answer: D —
    Only (i), (iii) and (iv)
    Wadded pique structures require a dobby loom, two warp beams (ground and backing/wadding), fast reed beat-up, and drop box mechanisms.
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  68. 68.
    Which of the following statement is incorrect with respect to the wadding ends in bed ford cords?
    Show answer and explanation
    Answer: A —
    Wadding ends are generally finer than principal warp yarns
    Wadding ends in Bedford cords are usually coarser, not finer, than principal warp yarns to add bulk and prominence to the cord effect.
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  69. 69.
    Which of the following method is/are used to construct self stitched double cloths? (i) Stitching from face to back (ii) Stitching from back to face (iii) Combination stitching
    Show answer and explanation
    Answer: D —
    All of the above (i), (ii) and (iii)
    Self-stitched double cloths can be constructed by stitching face to back, back to face, or through combination stitching.
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  70. 70.
    The fabrics constructed by reversing a small unit of the weave, in which the weaves are in sections and tend to oppose each other is _________
    Show answer and explanation
    Answer: B —
    Perforated fabrics
    Perforated or mock-leno/fancy spot fabrics are constructed by reversing small units of weaves to create opposing sections and small gaps.
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  71. 71.
    Garments can be classified as panty wear, cargo pant, thigh wear and stockings based on the ___________
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    Answer: C —
    Length of garment
    Categorizations like panty wear, cargo pants, thigh wear, and stockings are primarily based on the length and body coverage of the garment.
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  72. 72.
    According to the Eight head theory, _________ head is important for full length garments like trousers
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    Answer: C —
    7th
    In fashion croquis and the eight-head theory, the crotch and trouser length benchmarks align around the 7th head division.
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  73. 73.
    All the patterns in the marker plan should be kept such that the grain line in the pattern should be parallel to the fabric selvedge for __________
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    Answer: A —
    Better hanging and draping of garments
    Aligning grain lines parallel to the selvedge ensures proper dimensional stability, balance, and better draping of the finished garment.
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  74. 74.
    _________ is the upper part of the feeding combination that holds/grips the fabric in place for the feeding action and stitch formation
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    Answer: D —
    Presser foot
    The presser foot holds the fabric against the feed dog during sewing.
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  75. 75.
    __________ is normally engaged for accurate cutting of the finest shapes of garment components
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    Answer: B —
    Band knife
    A band knife has a narrow, continuous blade capable of high-precision cutting of intricate garment shapes and small components.
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  76. 76.
    As per ISO 4916 : 1991 system of seam classification, the class 2 seam refers to _________
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    Answer: C —
    Lapped seam
    ISO 4916 Class 2 designates lapped seams.
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  77. 77.
    According to the British standard, _________ is categorized as hand stitches
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    Answer: B —
    Class 200
    Stitch class 200 represents hand stitches or machine stitches simulating hand stitches using a single thread.
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  78. 78.
    Which of the following statements are correct with respect to type of pressing of garments? (i) Top pressing refers to the finishing operation which garment undergoes after being completely assembled. (ii) Edge pressing before top-stitching comes in the category of top pressing. (iii) Electric steam iron can be used for under pressing operation.
    Show answer and explanation
    Answer: A —
    Only (i) and (iii)
    Top pressing is final assembly pressing, and electric steam irons are standard for underpressing. Intermediate edge pressing is underpressing/in-process pressing.
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  79. 79.
    Which principle of fashion design refers to the contrasting colour such as black dress with white collar in the garment?
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    Answer: D —
    Emphasis
    Emphasis (or focal point) is created by using contrasting colors, textures, or details, such as a white collar on a black dress.
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  80. 80.
    Which of the following statements are correct with respect to fashion design? (i) Decorative designs are drawn by the beginners as well as boutique designers (ii) Decorative design does not need a croque (iii) Structural design is the fundamental component of design (iv) Structural designs are drawn by the designers in the buying house
    Show answer and explanation
    Answer: A —
    Only (i), (iii) and (iv)
    Structural design is fundamental; decorative design builds upon it. Beginners draw decorative sketches, and structural specifications are handled in buying houses/production.
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  81. 81.
    The method used for sampling the fibres in a yarn
    Show answer and explanation
    Answer: A —
    Cut square method
    The cut square method is a standard technique for extracting and sampling fibers from a yarn for staple length or property analysis.
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  82. 82.
    The type of distribution curve which is symmetrical about a central value
    Show answer and explanation
    Answer: C —
    Bell shaped distribution curve
    A bell-shaped distribution curve (Normal distribution) is symmetrical around the central mean value.
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  83. 83.
    Which factor do not affect the moisture regain of textile products.
    Show answer and explanation
    Answer: D —
    Sample size
    Moisture regain is an intrinsic equilibrium property and is independent of the sample size.
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  84. 84.
    When 2.5% span length of cotton sample was measured on a fibrograph, the result was 25 mm. This indicates.
    Show answer and explanation
    Answer: C —
    2.5% of fibres clamped are 25 mm or longer
    Span length represents the percentage of fibers (e.g., 2.5%) that are equal to or longer than the specified length (25 mm).
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  85. 85.
    The micronaire value of a cotton sample is dependent on both the fibre
    Show answer and explanation
    Answer: B —
    Fineness and Maturity
    Micronaire measures air permeability through a cotton plug, which depends on both fiber fineness (perimeter) and maturity (cell wall thickness).
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  86. 86.
    Short fibre content referred to as Short Fibre Index (SFI) is derived by the instrument
    Show answer and explanation
    Answer: D —
    HVI
    High Volume Instrument (HVI) provides the Short Fibre Index (SFI) alongside length parameters.
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  87. 87.
    In the tex count system, the relationship that results between twist, twist factor, and yarn count is
    Show answer and explanation
    Answer: C —
    Twist per metre = Twist Factor / \sqrt{\text{Tex}}
    In the tex system, Twist Per Meter (TPM) = Twist Factor (TMtexTM_{tex}) / Tex\sqrt{\text{Tex}}.
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  88. 88.
    In classimat yarn faults classification A2 counts all faults shorter than 1 cm whose linear density is more than __________ of the average linear density of
    Show answer and explanation
    Answer: D —
    150%
    In Uster Classimat classification, A2 faults correspond to short thin faults with mass decrease or increase criteria, specifically >150% threshold definitions for thick faults.
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  89. 89.
    In a zweigle yarn hairiness tester the number of hairs is counted simultaneously by a set of
    Show answer and explanation
    Answer: A —
    Photocells
    Zweigle hairiness testers use optical photocells to count protruding fibers (hairs) at various lengths from the yarn body.
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  90. 90.
    The fabric weight per square meter is calculated using following the formula
    Show answer and explanation
    Answer: C —
    GSM = Weight of the sample in gram × 10,000/ Area of sample in cm2\text{cm}^2
    GSM = Weight in grams×10,000Area in cm2\frac{\text{Weight in grams} \times 10,000}{\text{Area in cm}^2}.
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  91. 91.
    Elmendorf tear tester pendulum is having the maximum potential energy
    Show answer and explanation
    Answer: C —
    When the moving clamp is in alignment with fixed clamp
    The pendulum has maximum potential energy at its highest raised starting position, which corresponds to when the moving and fixed clamps are aligned before release.
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  92. 92.
    In ICI pilling box testing the pilling grade rating 4 gives sample descriptions as
    Show answer and explanation
    Answer: B —
    Slight change
    In pilling ratings from 5 (no pilling) to 1 (very severe pilling), grade 4 corresponds to a slight formation of pills (slight change).
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  93. 93.
    The correction factor of divergence of light rays (K) for calculating the area of drape pattern is
    Show answer and explanation
    Answer: B —
    0.91
    The correction factor KK for light ray divergence in a drape meter is approximately 0.91.
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  94. 94.
    The needle bearings are used in
    Show answer and explanation
    Answer: D —
    Bottom drafting roller
    Needle roller bearings are typically employed in textile machinery for supporting bottom drafting rollers.
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  95. 95.
    The lowest temperature at which a lubricant gives off enough vapour and ignites for a moment when a small flame is brought near it
    Show answer and explanation
    Answer: A —
    Flash point
    Flash point is the lowest temperature at which vapors of a lubricant catch fire momentarily upon exposure to an ignition source.
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  96. 96.
    In a micrometer one division on the thimble represent
    Show answer and explanation
    Answer: A —
    0.01 mm
    Standard metric micrometers have a least count (one division on the thimble) of 0.01 mm.
    Report a mistake
  97. 97.
    The knife edge approach of static balance is very effective for
    Show answer and explanation
    Answer: C —
    Light weight single plane rotor operating at low speed
    Knife-edge balancing is a simple static balancing method suitable for lightweight, single-plane rotors.
    Report a mistake
  98. 98.
    The good value of illumination recommended for blow room implemented by all modern mills in India is
    Show answer and explanation
    Answer: A —
    200 lux
    Recommended illumination level for blow room and general spinning processing areas is around 200 lux.
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  99. 99.
    These store items needed for a spinning mill are reviewed according to a review calendar established by the store and purchase department
    Show answer and explanation
    Answer: A —
    Standard consumables
    Standard consumables are routinely reviewed and replenished according to a fixed purchase review calendar.
    Report a mistake
  100. 100.
    The vane anemometer gives the air flow measurement inside a cotton weaving mill in the speed range of
    Show answer and explanation
    Answer: B —
    0.3 to 5 m/s
    Vane anemometers are suitable for measuring moderate air velocities typically ranging from 0.3 to 5 m/s in ventilation and HVAC assessments.
    Report a mistake

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