CE 8394 FLUID MECHANICS & MACHINERY

Bulk modulus is the ratio of

• shear stress to volumetric strain

• volumetric strain to shear stress

• compressive stress to volumetric strain

• volumetric strain to compressive stress

What is the correct formula for absolute pressure?

• P_abs = P_atm – P_gauge

• P_abs = P_vacuum – P_atm

• P_abs = P_vacuum + P_atm

• P_abs = P_atm+ P_gauge

The fluid will rise in capillary when the capillary is placed in fluid, if

• the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules

• the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules

• the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules

• cannot say

What is an ideal fluid?

• A fluid which has no viscosity

• A fluid which is incompressible

• A fluid which has no surface tension

• All of the above

Which property of the fluid offers resistance to deformation under the action of shear force?

• density

• viscosity

• permeability

• specific gravity

Shear stress in static fluid is

• always zero

• always maximum

• between zero to maximum

• unpredictable

In a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as

• Euler’s theorem

• Navier-stockes theorem

• Reynolds’s theorem

• Bernoulli’s theorem

One litre of a certain fluid weighs 8N. What is its specific volume?

• 2.03 x 10^{– 3} m³/kg

• 20.3 x 10^{– 3} m³/kg

• 12.3 x 10^{– 3} m³/kg

• 1.23 x 10^{– 3} m³/kg

When the angle between surface tension with the liquid (θ) is greater than 90^o, the liquid becomes

• flat

• concave upward

• convex upward

• unpredictable

The above diagram is a graph of change in shear stress with respect to velocity gradient in a fluid. What is a type of the fluid?

• Newtonian fluid

• Non-Newtonian fluid

• Ideal fluid

• Dilatent fluid