# FREE Bachelor of Mechanical Engineering Fluid Mechanics Questions and Answers

#### When does a fluid become laminar?

A Reynolds number has no dimensions. In fluid mechanics, it helps to forecast the flow pattern. Because the flow has a relatively low density at low Reynolds numbers, the value of Reynolds number is less than 2000.

#### What does fluid dynamics entail?

Fluid mechanics is the study of how liquids, gases, blood, and plasmas behave both at rest and while moving. Mechanical, chemical, biological, and astrophysical systems all make use of fluid mechanics in various ways.

#### Which of the following approaches is most frequently employed for analysis in fluid mechanics?

At a location in the flow field, we define velocity, acceleration, pressure, and other parameters utilizing the Eulerian method. This makes fluid mechanics the field in which it is most frequently used.

#### A fluid experiences a volumetric shift when it encounters resistance because of .

A fluid's compressibility is measured as a proportional change in volume. Due to the rise in temperature and pressure, it is also known as isothermal compressibility in fluid mechanics.

#### Which of the following corresponds to the Blake number standard symbol?

B or Bl is the typical representation of the Blake number. Blake number in fluid mechanics discusses porous medium, fluid mechanics, and geology. It results from the dominance of inertial forces over viscous ones during fluid flow through porous media.

#### What do you name a person's area of study if they research a fluid that is at rest?

Fluid Statics is the study of fluid at rest, Fluid Kinematics is the study of fluid in motion without consideration of forces, and Fluid Dynamics is the study of fluid in motion taking application forces into account. Fluid Mechanics deals with the study of fluid at rest or in motion with or without consideration of forces.

#### A fluid is said to be turbulent when...

A Reynolds number has no dimensions. In fluid mechanics, it helps to forecast the flow pattern. The flow has a relatively high density at high Reynolds numbers, which is why the value of Reynolds number is more than 2000.

#### Which of the following best describes the fundamental tenet of fluid mechanics?

The three fundamental principles of fluid mechanics are the continuity equation (i.e., mass conservation), the momentum principle (i.e., momentum conservation), and the energy equation.

#### Which of the following, according to thermodynamics and fluid mechanics, describes the temperature at a fluid flow's stagnation point?

The temperature at the fluid flow's stagnation point is known as the stagnation temperature. These terms are used in the fields of fluid mechanics and thermodynamics. The fluid's speed is zero at a stagnation point, and all of the kinetic energy has been transformed into internal energy and added to the surrounding static enthalpy.

#### This is the presumption for the compressible flow.

Different types of flow are covered under the fluid mechanics subfield known as compressible flow. The shift in fluid density is where its greatest significance lies. Gas dynamics are a topic. It is presumpted that flow is isentropic.

#### Which approach from the list below is only utilized in fluid mechanics?

Instead of focusing on the motion of each individual particle, fluid mechanics is more concerned with the overall state of motion at various places in the fluid system (as in the Eulerian method) (as in Lagrangian approach). As a result, fluid mechanics makes considerable use of the Eulerian approach.

#### What exactly is model testing?

Model testing is the term for the procedure used in fluid mechanics to examine complex fluid dynamics. Performance testing is being done. Testing models after a common scale is helpful. Typically, models are scaled down from the final design.

#### In fluid mechanics, the stagnation point is the location when the fluid's velocity is .

In fluid physics, the stagnation point is the location where the fluid's velocity is zero. Points where a fluid is brought to a state of rest by an object are known as stagnation points. They typically reside on an object's surface.

#### What purposes does fluid mechanics serve?

Understanding the behavior of fluids under various stresses and atmospheric conditions and choosing the right fluid for various applications are both made possible by fluid mechanics.

#### Which of the following corresponds to the Atwood number's standard symbol?

A is the accepted abbreviation for the Atwood number. The emergence of instabilities in fluid mixes is the subject of Atwood's number in fluid mechanics. It results from variations in fluid density.

#### When does a fluid become laminar?

The third principle of fluid mechanics is provided by the conservation of linear momentum. In addition to mass continuity and energy conservation, it also exists. They are most frequently observed in channel flow issues.