GATE 2017-2018 :: GATE Textile and Fibre
- Malachite Green is an important dyestuff. The typical green colour is obtained when the dye molecule is
- A typical curve between equilibrium dye uptake and dyeing temperature goes through a maximum. After the maximum, the dye uptake decreases because
- The efficacy of the wash-n-wear treatment can be estimated by measuring its
- Softener reduces the bending rigidity of fabrics by decreasing
- The density of a given polyester filament sample is 1.38 g/cm3. Consider the density of fully crystalline polyester as 1.455 g/cm3 and that of fully amorphous polyester as 1.335 g/cm3. The percent crystallinity of the sample is ________.
- Cleaning efficiency of the opening roller in a rotor spinning machine, having 56 mm diameter rotor, is 80 %. The yarn breaks when the trash deposition within the rotor groove crosses the threshold of 1 mg/mm. If a sliver with 0.4 % trash is fed at 7.5 g/min, the number of end breaks in 1 hr (to the nearest whole number) is ________.
- In a projectile weaving machine the projectile travels a total distance of 250 cm at an average velocity of 25 m/s. If the time period during which it is in motion occupies half of the loom cycle, the maximum loom speed in picks per minute is ________.
- A 225 denier viscose yarn has a breaking strength of 7.5 N. The yarn tenacity in cN/dtex is ________.
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In an experiment, 1 g each of the mercerized and unmercerized fabric samples are separately treated in 30 ml of 0.25N barium hydroxide solution for the required time. 10 ml of these solutions are drawn and titrated against 0.1N HCl solution. The volumes of HCl consumed at the end of these titrations are m for mercerized and u for unmercerized cases. If Barium Activity Number (BAN) = [(b-m)/(b-u)]*100,where m=18 ml, u=20 ml and b is the volume of HCl consumed in the blank titration, then the BAN value for the above mercerized sample is ________.
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Consider the following Assertion [a] and Reason [r] [a] M is an orthogonal matrix, but not a skew-symmetric matrix.[r] Because MT = M−1 and MT ≠−M.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
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