# FREE Bachelor of Aerospace Engineering Questions and Answers

#### The term ∇.V in the equation ∇.V=1/ v*D (v)/Dt is .

Divergence of velocity, where v is tiny volume and because of this small volume, ∇, is physically the time rate of change of the volume of a moving fluid element per unit volume.The volume's V stays the same. For the physical interpretation of the divergence of velocity, moving control volume is used.

#### Which of the following is responsible for the continuous flow of oil jets?

Oil jets resist external forces due of differences between the molecules near the surface and the free layer. The cohesiveness of oil molecules contributes to the oil's increased surface area.

#### The calculation of kinetic energy is as follows:

It is a product of mass and velocity squared. When an object is in motion or has a specific mass, kinetic energy enters the picture. It is described as the effort required to move a body quickly from a resting to a moving condition.

#### Which of the following requires the most analysis?

Because fluid is a "squishy" substance, both liquid and gas. While the solid body's motion can be clearly specified because of how well its geometry is determined. In contrast, it might be challenging to choose a qualitative model for a fluid's motion.

#### That which follows is a point attribute, right?

From one point to another, both pressure and density differ. The relationship between pressure and density changes with altitude and is directly proportional. As they transition from one location to another, pressure and density do rely on the passage. Changes in one parameter have an impact on both pressure and density.

#### Which law of thermodynamics is the foundation for energy conservation?

Energy cannot be generated or destroyed, according to the first law of thermodynamics, but it can be changed from one form to another.

#### What flow is most appropriate for the space shuttle?

From one point to another, both pressure and density differ. The relationship between pressure and density changes with altitude and is directly proportional. As they transition from one location to another, pressure and density do rely on the passage. Changes in one parameter have an impact on both pressure and density.

#### The chimney's smoke particles fall within the category of .

The location of the particle that has already passed through the fixed point is referred to as the streakline. When a chimney is involved, the chimney serves as the fixed point, and the smoke that escapes from it creates the locus. It is possible to follow the smoke's route.

#### The streamline equation in steady-state flow is given by .

The velocity is constant with respect to time in a steady flow. As a result, the velocity, dy/dx=y/x, stays constant. By integrating the aforementioned equation, we get at x=y, demonstrating that for constant flow with the same velocity field, the pathline and streamline are identical.

#### What similarity of a flow does the intera force fall under?

The model and prototype must be geometrically and kinematically comparable in order to have a dynamic similarity, and the total amount of forces operating at any given place on the model and prototype must also be identical. Since inertia force fits the requirement, it is considered a dynamic similarity.

#### The quantity defining the motion or flow is known as .

Flux density is another name for flux. The quantity (q) flowing per unit volume is what matters (v). The quantity should be able to flow or move.

#### Raj was watching the river's flow from the edge of the waterway. After some time, he had a thought and began to visualize certain places in the fluid; when he drew tangents to those points, he was able to determine the direction of the flow. These lines are referred to as .

The lines in a fluid domain are called streamlines. Drawing tangents from these lines reveals the direction of the fluid particle's motion. Ram was able to see the streamlines when he started visualizing the points in the fluid and drawing tangents from those spots.

#### The continuity equation in electromagnetic theory connects

Maxwell's equation, which states that divergence of current density is equal to the negative rate of change of charge density ∇.J=- ρ/t, leads to charge conservation in electromagnetic theory. Where J is the current density and t is the charge density.

#### What kind of fluid flow model is appropriate?

A finite volume that is either fixed in space or moving along a fluid is taken into account by the finite control volume. The smallest infinitesimal element takes into account a finite element that could either be fixed or moving with the flow. The microscopic molecular technique can be used with both atoms and molecules.

#### The continuity equation has a connection to .

Mass conservation is connected to the continuity equation. According to this, the total mass entering a body and the total mass exiting a body are equal. Mass leaving the body equals mass coming in.

#### Which of the following shares the same qualities?

In accordance to the rate of change of deformation, there will be an increasing deformation when force is applied to liquid and gas. Liquid and gas molecules are also loosely packed. They take on the shape of the container they are placed in when filled.