List of top Textile Engineering and Fibre Science Questions on Yarn Manufacture, Structure and Properties asked in GATE TF

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.

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

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

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

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: In boiling water, polyester POY shows higher shrinkage than polyester FDY.
[r]: Molecular chain orientation is higher in polyester FDY than polyester POY.

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:

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

If twist factor is same for a set of cotton yarns, then the yarns have the same:

In the amorphous phase, polymer chains prefer to be in a random coil conformation to

For a wool fibre strand, the relationship between \( V_r \) (limit CV % of linear density) and \( N \) (average number of fibres in the cross-section of the strand) is given below. \[ V_r = \frac{112}{\sqrt{N}} \] For the above relationship, the CV % of linear density of wool fibre (rounded off to 2 decimal places) is ______________.

A monofilament gets extruded at a speed of 10 m/min from a spinneret of 0.2 mm diameter. In order to ensure a spin draw ratio of 11, the first godet roller with a diameter of 70 cm has to rotate with an angular velocity (rpm) of (rounded off to nearest integer) ______________.

Nine slivers having same mean linear density are doubled on a drawframe. If the standard deviation of linear density of each sliver is 0.3 ktex, then the standard deviation (ktex) of linear density of the doubled sliver (correct up to 1 decimal place) is ________________.

Keeping the speed of all other components of a carding machine unchanged, the angular velocity of a cylinder with damaged wire points in an area of 2 cm \( \times \) 2 cm is doubled. Wavelength of the periodic fault in the card sliver would be:

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: As compared to parallel wound yarn packages, ring bobbins exhibit lower tendency of slough off during unwinding.
[r]: The main winding layers in the ring bobbins are separated by cross-winding layers.

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: Para-aramid fibres have better mechanical properties as compared to meta-aramid fibres.
[r]: The chemical structure of para-aramid fibres allows them to pack closely.

A three-bladed beater is running with an angular velocity of 600 rpm and delivering material at a rate of 600 kg/h. The number of strikes per kg of delivered material (in integer) is ________________.

Assume that there is no compression of roving during winding and each coil of a layer is placed directly over the coil of the previous layer. A full roving bobbin consisting of 50 layers of roving is wound on an empty bobbin of 60 mm diameter. If the diameter of the roving is 1 mm, then the diameter (mm) of the full bobbin (in integer) is ________________.

In a comber, the component that rotates both in the forward and backward directions is:

Yarn that has helically twisted fibres at the core and belts/wrappers on the surface is