List of top Textile Engineering and Fibre Science Questions asked in GATE TF

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

With reference to KES-FB and FAST systems, the same low stress mechanical property is measured by

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

Determine the correctness or otherwise of the following Assertion [a] and Reason [r] [a]: MgCl$_2$ is used in the formulation of anti-crease finishing of cotton fabric with DMDHEU.
[r]: MgCl$_2$ is an acidic salt and acts as a catalyst.

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]:
[a]: A partially scoured cotton fabric bleached with H$_2$O$_2$ exhibits higher water absorbancy than that bleached with NaClO$_2$.
[r]: Bleaching with H$_2$O$_2$ also facilitates scouring.

In wet spinning of acrylic fibres

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 .................

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:

In warp knitting, the lapping movement having only under-lap 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 statements regarding Nylon 6 production from caprolactam using water as a catalyst.
[(P)] The first reaction involving ring-opening of caprolactam with water is an endothermic reaction.
[(Q)] Increase in water concentration during the polycondensation results in a higher molecular weight polymer
[(R)] The polycondensation is an irreversible reaction
[(S)] Increase in temperature during the polycondensation results in a lower molecular weight polymer.
The correct combination of TRUE statements 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 cotton fabric is to be dyed with 2 % shade (on the weight of fabric). If dye concentration is 0.4 g/L, then the material-to-liquor ratio is 1 : X. The value of X (in integer) 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 PET sample with 40% crystallinity shows only a melting endotherm in the first heating cycle of DSC with a melting enthalpy of 50 J/g. The degree of crystallinity (%) of another PET sample which also shows only a melting endotherm but with a melting enthalpy of 80 J/g is (in integer) .................

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 ................

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:

The Newton-Raphson method is being used for two iterations to find an approximate solution of the equation \( e^x - 1 = 0 \) with an initial guess of 1. The difference between the actual and approximate solutions (rounded off to 2 decimal places) is .................

The area under the curve \( y = x^2 + 2x \) between \( x = 0 \) and \( x = 4 \), using the trapezoidal rule with a step size of one, (in integer) is .................

Amongst the following weft knitted structures, double jersey structure(s) is/are

In flame retardant finishing of cotton fabric, the correct statement(s) is/are

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

In resist style of printing, the preferred arrangement for dyeing is:

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