List of practice Questions

Mass of 120 yards of cotton yarn is 3 g. The count (Ne) of yarn, (rounded off to one decimal place), is \(\underline{\hspace{2cm}}\).
A woven fabric with areal density of 300 g/m\(^2\) is tested by strip tensile test method, keeping the specimen width as 5 cm and gauge length as 25 cm. If the breaking load is 900 N, the tenacity (cN/tex) of the fabric is \(\underline{\hspace{2cm}}\).
If 3 and 6 are eigenvalues of the matrix \[ \begin{pmatrix} 5 & 2 & 0 \\ 2 & \mu & 0 \\ -3 & 4 & 6 \end{pmatrix} \] then the value of \( \mu \) is \(\underline{\hspace{2cm}}\).
If \( y(x) \) is a solution of \[ x^2 y'' - 4 x y' + 6 y = 0, y(-1) = 1, y'(-1) = 0, \] then the value of \( y(2) \) is \(\underline{\hspace{2cm}}\).
In melt spinning, the mass throughput rate of polymer is 210 g/min, the winding speed is 3000 m/min, and the linear density of the yarn produced is 200 denier. The effective draw ratio, (rounded off to two decimal places), is \(\underline{\hspace{2cm}}\).
The molecular weight (M) of a polymer is determined from Mark-Houwink equation by using coefficient \( K = 11.5 \times 10^{-3} \) ml/g and exponent \( a = 0.73 \). If the measured intrinsic viscosity \( [\eta] \) of the solution is \( 6.0 \times 10^2 \) ml/g then the value of \( M \times 10^{-6} \), (rounded off to two decimal places), is \(\underline{\hspace{2cm}}\).
A roving of 2 Ne count is fed to a ringframe set with a mechanical draft of 30. If the length of the drafted strand delivered from the nip of the front rollers is reduced by 3% due to twist then the count (Ne) of the yarn, (rounded off to one decimal place), is \(\underline{\hspace{2cm}}\).
Assuming no fibre loss in draw frame, if draft is equal to doubling then the delivered sliver, as compared to fed sliver, will exhibit
The typical shapes of comb sorter diagram and fibrogram of polyester fibres of equal cut length will be
In Classimat system, the yarn fault H2, as compared to yarn fault C3, is
The value of \( a \), for which the following system of equations \[ 2x + y + 3z = a, x + z = 2, y + z = 2, \] is consistent, is
If the function \( f(x, y) \) is defined by \[ f(x, y) = x^3 - \frac{3}{2} x^2 y^2 + y^3, x, y \in \mathbb{R}, \] then
In a modern high-performance blowroom line, the correct sequence of machines is
As compared to cylinder, doffer has
A textile filament records a tensile stress of 0.3 GPa at a tensile strain of 0.04. Assuming Hookean behavior, the tensile modulus (GPa) of the filament, (rounded off to one decimal place), is \(\underline{\hspace{2cm}}\).
Number of fibres, each of 40 mm length and 0.16 tex fineness, in a tuft of 24 mg mass is \(\underline{\hspace{2cm}}\).
Twist (turns per inch) of a cotton yarn of 36 Ne count produced with a twist multiplier of 3.5 inch\(^{-1}\).Ne\(^{-0.5}\) is \(\underline{\hspace{2cm}}\).
In winding, if traverse speed and package surface speed are the same, the angle of wind (in degree) is \(\underline{\hspace{2cm}}\).
During air-jet weft insertion, if the diameter of the yarn increases by 20%, then the percentage increase in drag force acting on the yarn would be \(\underline{\hspace{2cm}}\).
If the ratio of the linear densities (denier) of two circular fibers is 3, the corresponding ratio of their diameters, (rounded off to two decimal places), is \(\underline{\hspace{2cm}}\).
If the sample size (n) is 25 and the standard deviation (σ) of population is 2, then the standard error (SE) of sample mean, (rounded off to one decimal place), is \(\underline{\hspace{2cm}}\).
The wet expression for a padding mangle is set at 80 %. If the add-on of a flame retardant chemical required on the fabric is 2 %, then the concentration (g/L) of the chemical in the pad bath is \(\underline{\hspace{2cm}}\).
Assuming Beer-Lambert law is applicable for dilute solutions, if the molar concentration of dye in the solution is doubled then the percentage increase in absorbance would be \(\underline{\hspace{2cm}}\).
A high value of drape coefficient indicates
The process for removal of protruding fibres from fabric surface is