GATE (TF) Textile 2017 Question Paper Solution | GATE/2017/TF/53

Question 53 (Textile Engineering & Fibre Science)

Determine the correctness or otherwise of the following statements
[p] The contact angle \theta is indicative of the wettability of a textile surface by a liquid
[q] Values of \theta > 90^o indicate poor wetting surfaces

(A)Both [p] and [q] are equal
(B)Both [p] and [q] are false
(C)[p] is true but [q] is false
(D)[p] is false but [q] is true
Answer / Solution
Frequently Asked Questions | FAQs

What is wettability a function of?

Wettability is a measure of the ability of a liquid to spread over or penetrate a solid surface. The degree of wettability is influenced by several factors, including:

Surface tension of the liquid: A liquid with lower surface tension will have better wettability, as it will be more likely to spread over the solid surface.

Surface energy of the solid: A solid surface with higher surface energy will have better wettability, as it will be more attractive to the liquid molecules.

Chemical composition of the solid surface: The chemical composition of the solid surface can affect its wettability. For example, a hydrophilic surface (one that is attracted to water) will have better wettability with water than a hydrophobic surface (one that repels water).

Roughness of the solid surface: A rough surface will have better wettability than a smooth surface, as there will be more points of contact between the liquid and solid.

Temperature and pressure: Higher temperatures and pressures can improve wettability by increasing the mobility of the liquid molecules and reducing the resistance to penetration.

In general, wettability is a function of the intermolecular forces between the liquid and solid surfaces, and can be influenced by a wide range of factors. Understanding the factors that affect wettability is important in many areas of science and engineering, including materials science, surface chemistry, and fluid mechanics.

GATE Textile Engineering and Fibre Science (TF) Question Papers | GATE Textile Question Answer | GATE Textile Solved Question Papers | GATE Textile Papers | GATE Textile Answer Key