Q1: The dimensionless parameter not applicable to flowing liquids, is

ANS:D - Kinematic viscosity

The dimensionless parameter not applicable to flowing liquids is the Pressure coefficient. Here's a brief explanation of each parameter:

1. Reynolds number (Re): It is a dimensionless parameter used to predict flow patterns in different fluid flow situations. It compares the inertial forces to the viscous forces within a fluid flow, and it's applicable to both liquids and gases.
2. Weber number (We): It is a dimensionless parameter used to describe the ratio of inertial forces to surface tension forces within a fluid flow. It's applicable to both liquids and gases.
3. Pressure coefficient: This parameter describes the pressure distribution over a surface. It's dimensionless and often used in aerodynamics to characterize the pressure distribution around an airfoil or object in a fluid flow. It's not specifically limited to gases, but it's often used in aerodynamic applications.
4. Kinematic viscosity: It is the ratio of dynamic viscosity to density. It's a measure of a fluid's resistance to flow under the influence of gravity. It's applicable to both liquids and gases.
5. Friction factor: This parameter is used in fluid flow problems to describe the effect of fluid viscosity and roughness of the pipe wall on the pressure loss in the pipe. It's applicable to both liquids and gases.