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

A chute feed system feeds a fibre batt of linear density 300 g/m to a card. The waste extracted by the card is 5% and the total mechanical draft is 100. The linear density (ktex) of card sliver (correct up to 2 decimal places) is:
A spun yarn made of circular polyester fibres of 10 µm diameter is cut normal to the yarn axis. If the helix angle of a fibre is \( 40^\circ \), then the area (µm\(^2\)) of that fibre projected on the cut-section of the yarn (rounded off to 1 decimal place) is:
A circular hollow polyester fibre with a tenacity of 0.02 N/tex breaks at 0.2 N. If the density of polyester is 1.38 g/cm\(^3\) and the inner diameter of the fibre is 40 µm, the outer diameter (µm) of the fibre (rounded off to 1 decimal place) is:
In the first heating cycle of a differential scanning calorimetry (DSC) experiment, an as-spun Nylon 6 fibre showed an enthalpy change of 40 J/g during cold crystallization and an enthalpy change of 150 J/g during melting. If the heat of fusion of 100% crystalline Nylon 6 is 240 J/g, the percentage degree of crystallinity of as-spun Nylon 6 fibre (rounded off to 1 decimal place) is _________
A spun yarn made of circular polyester fibres of 10 µm diameter is cut normal to the yarn axis. If the helix angle of a fibre is \( 40^\circ \), then the area (µm\(^2\)) of that fibre projected on the cut-section of the yarn (rounded off to 1 decimal place) is:
A chute feed system feeds a fibre batt of linear density 300 g/m to a card. The waste extracted by the card is 5% and the total mechanical draft is 100. The linear density (ktex) of card sliver (correct up to 2 decimal places) is:
A circular hollow polyester fibre with a tenacity of 0.02 N/tex breaks at 0.2 N. If the density of polyester is 1.38 g/cm\(^3\) and the inner diameter of the fibre is 40 µm, the outer diameter (µm) of the fibre (rounded off to 1 decimal place) is:
Amongst the following, the correct reason(s) for high pilling tendency in a woven fabric is/are:
Amongst the following, the parameter(s) relevant to fibre fineness measurement using vibration method, is/are:
Amongst the following, the instrument(s) used for measurement of neps in cotton fibre tuft is/are:
If melting, pyrolysis, and combustion temperatures of polyester fibre are denoted by \(T_m\), \(T_p\), and \(T_c\) respectively, then the correct order of temperatures is:
A fibre of length \( l \) is to be divided into two pieces. Multiplying the square of the length of one piece with the cube of the length of the other piece yields the greatest possible product value. Amongst the following, the correct combination of the lengths is:
In the first heating cycle of a differential scanning calorimetry (DSC) experiment, an as-spun Nylon 6 fibre showed an enthalpy change of 40 J/g during cold crystallization and an enthalpy change of 150 J/g during melting. If the heat of fusion of 100% crystalline Nylon 6 is 240 J/g, the percentage degree of crystallinity of as-spun Nylon 6 fibre (rounded off to 1 decimal place) is _________
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.
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
During the measurement of cotton fibre fineness (micronaire) by air flow method, a higher quantity of cotton fibre is taken by mistake than specified. The reading of micronaire value from the instrument will be:
Amongst the following, hydrolytic desizing agents attack starch at: