List of top Textile Engineering and Fibre Science Questions

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.

Group I gives a list of fibres and Group II contains their applications. Match the fibre with its application.

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

Group I gives a list of loom motions and Group II contains loom systems. Match the motion from Group I with the corresponding system from Group II. 
Group I                       Group II 
P. Shedding           1. Matched cam 
Q. Picking              2. Seven wheel 
R. Beat-up             3. Rapier 
S. Take-up              4. Jacquard 
 

Group I gives a list of terms related to woven fabrics and Group II contains equivalent terms related to knitted fabrics. Match the term from Group I with the equivalent term from Group II. 

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: In shuttle loom, late shedding is preferred for filament weaving.
Reason: In late shedding, the timing of shed dwell matches with the timing of shuttle travel through the shed, and therefore, it minimizes the rubbing of warp yarns.
Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Application of an optical brightening agent makes the white fabrics appear brighter.
Reason: Optical brightening agents absorb energy in the visible region and radiate back in the UV region.
Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Nylon is dyed with acid dyes in the acidic medium.
Reason: Nylon assumes positive charge in the acidic medium and thus attracts the negatively charged acid dye molecules.
Determine the correctness or otherwise of the following Assertion [a] and Reason [r]:

Assertion: Discharge printing of dyed polyester fabric is not possible.
Reason: The discharging agents damage the polyester fibers significantly.

A 50 tex yarn with mass CV of 12.5 % is produced from staple polyester fibres each of 4.5 denier fineness. The index of irregularity of the yarn, (rounded off to two decimal places), is\(\underline{\hspace{2cm}}\).