List of top Fabric Manufacture, Structure and Properties Questions

In melt spinning of a monofilament, a polymer is extruded at a volumetric flow rate of $5\times10^{-5}\ \text{m}^3\!/\text{s}$ through a circular spinneret. The take-up velocity is $100\ \text{m/s}$ with a draw ratio of $50$. The diameter (mm) of the spinneret orifice (rounded off to 2 decimal places) is ______________________________.

A 36 Ne ring spun yarn is produced from 1.2 Ne roving. The total draft and the break draft of the roving frame are 12 and 1.2, respectively. The diameters of back bottom roller, middle bottom roller and front bottom roller of the roving frame are 28 mm, 25 mm and 28 mm, respectively. If the middle bottom roller of the roving frame is eccentric, then the wavelength (m) of the periodic fault in the yarn, neglecting twist contraction, (rounded off to 2 decimal places) is \underline{\hspace{2cm}.}

A square jammed plain cotton woven fabric is produced from 10 Ne yarn of circular cross-section. Assuming yarn density \(=0.91~\text{g/cm}^3\), find the number of threads per inch (rounded to the nearest integer).

In a roving frame, the ratio of the diameter of the top (driver) cone-drum to the diameter of the bottom (driven) cone-drum is inversely proportional to bobbin diameter. At an instant,
Top cone-drum diameter = 212 mm
Bottom cone-drum diameter = 108 mm
Bobbin diameter = 54 mm
When the bobbin diameter becomes 100 mm, the ratio of the top cone-drum diameter to the bottom cone-drum diameter (up to 2 decimal places) is ____________________________________.

In a ring frame, the speeds of traveller at 50 mm bobbin diameter (near the base of the cop) and at 25 mm bobbin diameter (near the tip of the cop) are 13500 rpm and 13400 rpm, respectively. The nominal twist (tpm) (rounded off to 2 decimal places) is ____________________________________.

A circular knitting machine of 26 inch diameter and 20 gauge with 120 feeders is running at 30 rpm to produce a plain knitted fabric using 30 tex yarn. If the loop length is 3 mm, find the rate of production (kg/h), rounded off to 1 decimal place.

The force exerted by the reed on the cloth-fell at the instant of beat-up (weaving resistance) depends on

With reference to the work factor (WF) and work of rupture (WR) of two yarns with the same breaking load and the same breaking elongation, the correct statement(s) is/are

Amongst the Classimat faults A2, B1, D4, H2 and I1, the correct statement(s) is/are

Drafting force in drawframe, when fibres are sliding, reduces with higher

In wet spinning of acrylic fibres

In warp knitting, the lapping movement having only under-lap is

Consider the following statements with regard to the timing diagram of a cotton combing machine. P. In forward feed system, feeding mostly takes place when nippers are closing
Q. Cylinder comb starts combing after feeding ends
R. Detaching rollers move backward during forward movement of nipper assembly
S. Top comb is not combing when detaching rollers move forward
The correct combination of TRUE statements is:

Consider the following reasons of shuttle loom stoppage. P. Breakage of warp yarns
Q. Entrapment of shuttle inside the shed
R. Flying of shuttle out of the shed
S. Slackening of a warp yarn
The correct combination that triggers the warp protector motion is

Consider the following activities on a carding machine:
P. Lowering surface speed of feed roller
Q. Increasing rotational speed of taker-in
R. Increasing linear density of feed material
S. Use of shorter and finer fibres
The correct combination of the above activities to obtain more number of taker-in teeth acting per fibre is ____________________.

A ring spun yarn with mean linear density of 32 tex is produced from 2 denier polyester staple fibre. If the standard deviation of the yarn linear density is 3.2 tex, then the index of irregularity of the yarn (up to 1 decimal place) is:

A plain woven fabric with 20 ends per cm and 30 picks per cm is prepared with 30 tex warp yarns and 25 tex weft yarns. Neglecting yarn crimp, the areal density (g/m\(^2\)) of the fabric (in integer) is:

If the twist multiplier in the indirect system is 4.8 tpi/Ne\(^{0.5}\), then the twist factor in the direct system (tpm tex\(^{0.5}\)) (rounded off to 2 decimal places) is ____________________

For the same turns per unit length, as the yarn becomes coarser