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

A polymer melt being extruded through a spinneret hole of circular cross-section exhibits a die-swell ratio of 2.2. The extrusion velocity and volumetric flow rate during this extrusion process are 20 m/min and \(2.6 \times 10^{-8}\) m\(^3\)/s, respectively. The maximum diameter (mm) of the extruded melt after exit from the spinneret hole (rounded off to 2 decimal places) is:
The fibre which does NOT contain 1,4-glycosidic bonds is
A polymer melt being extruded through a spinneret hole of circular cross-section exhibits a die-swell ratio of 2.2. The extrusion velocity and volumetric flow rate during this extrusion process are 20 m/min and \(2.6 \times 10^{-8}\) m\(^3\)/s, respectively. The maximum diameter (mm) of the extruded melt after exit from the spinneret hole (rounded off to 2 decimal places) is:
Determine the correctness or otherwise of the following Assertion [p] and Reason [r].
[p]: The tenacity of a polymeric fibre depends on the strain rate
[r]: Under mechanical deformation polymeric fibre exhibits both elastic as well as viscous response
Amongst the following, the exothermic transition(s) is/are:
The fibre forming polymer which contains aromatic group in the main chain is:
Three monodisperse Nylon 6 samples with molar masses 10000 g/mol, 30000 g/mol and 60000 g/mol are mixed in a proportion of 1:1:2 by number of chains. The polydispersity index of the resulting sample (rounded off to 2 decimal places) is ______________________________.
Copolymers are present in
The amide linkage is NOT present in:
In melt spinning of a monofilament, a polymer is extruded at a volumetric flow rate of \( 5 \times 10^{-5}\ \text{m}^3/\text{s} \) 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 .................
Three monodisperse Nylon 6 samples with molar masses 10000 g/mol, 30000 g/mol and 60000 g/mol are mixed in a proportion of 1:1:2 by number of chains. The polydispersity index of the resulting sample (rounded off to 2 decimal places) 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
Copolymers are present in
The amide linkage is NOT present in: