List of top Textile Engineering and Fibre Science Questions on Finishing of cotton

Consider the following diagram where an oil droplet is formed on a fabric immersed in water. At equilibrium, the balance of various interfacial forces acting on the droplet is given by the following equation:
\[ \gamma_{FW} = \gamma_{FO} + \gamma_{OW} \cos \theta \]
When a surfactant is added to water, assuming that \(\gamma_{OW}\) and \(\gamma_{FO}\) remain unchanged, the following happens:

One kg bone-dry cotton fabric is padded with water to obtain 80 % wet pick up. The temperature of the wet fabric after padding is 30 °C. Assume the specific heat of water to be 1 cal/(g.°C); the latent heat of evaporation of water to be 540 cal/g and the specific heat of cotton to be 0.3 cal/(g.°C). The energy (kcal) required to dry the fabric completely (in integer) is____

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]:
[a]: Cotton does not exhibit melting behaviour when exposed to flame not er alline 
[r]: Cotton is not crystalline enough to exhibit melting behaviour 2024