List of top Textile Engineering and Fibre Science Questions

If the reflectance of a dyed fabric at \( \lambda_{max} \) is 10%, then the colour strength value (K/S) of the dyed fabric (correct up to 2 decimal places) is ________________.

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.

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].

Match the properties listed in Group I with the corresponding measuring techniques given in Group II. The correct option is

Molecular weight (g/mol) of polypropylene with a degree of polymerisation of 1000 (rounded off to nearest integer) is ________________.

Polydispersity index of a polymer is 5 and its weight average molecular weight is 8400 g/mol. The number average molecular weight (g/mol) of the polymer (in integer) is ________________.

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 ________________.

A yarn is unravelled from a woven fabric specimen of 1 m $\times$ 1 m size. If the length of the straightened yarn is 1.1 m, then the crimp percentage (in integer) is ________________.

In a projectile loom, the energy stored in a torsion rod just before picking is proportional to \( r^n \). If \( r \) is the radius of the torsion rod, then the value of \( n \) (in integer) is ________________.

Cusick drape test on a fabric specimen results in a drape coefficient of 0.7. If the total mass of the paper ring is 3.0 g, then the mass (g) of the paper with shaded area (correct up to 1 decimal place) is ________________.

If moisture regain of polyester and cotton is 0.4 % and 8.5 %, respectively, then moisture regain (%) of 70:30 polyester-cotton blend (correct up to 2 decimal places) is ________________.

Scouring and cold mercerisation of cotton are carried out by treatment with aqueous sodium hydroxide. The process parameters that differ in the two processes are:

Woven fabrics can be dyed in open width form in

Direct measurement of degree of thickening (\( \theta \)) of cotton fibre is carried out using

A relatively flat middle zone in a comb sorter diagram indicates:

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

Cotton fibre has maximum amount of cellulose in

High extensibility of wool fibre is due to:

The ingredient that is NOT used in sizing formulations is

The machine that uses ‘Horn gears’ is

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]:
Assertion: Draw texturing of isotactic polypropylene (POY) at a relatively high speed is possible despite high crystallinity of the feeder yarn.
Reason: Isotactic polypropylene (POY) has majorly smectic mesomorphic phase.

Techniques used for determination of orientation in fibres from amongst the followings are
P. Birefringence measurement
Q. Scanning electron microscopy
R. X-ray diffraction
S. Differential scanning calorimetry