Theory-based Quiz

Total time - 60 mins.

Total number of Questions - 45

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Basics of Fluid Dynamics ITC


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1 / 44

In the case of Couette flow between two moving plates, the distribution of shear stress inside the fluid is:

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A massless particle in an unsteady flow is tracked from an initial position at ($x_0$,$y_0$,$z_0$) at $t=t_0$ to a second position at ($x_1$,$y_1$,$z_1$) at $t=t_1$. The curve traced out by the particle is referred to as a ________.

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We wish to use CFD to model the air flow around a car. The car is travelling north at a speed of $60$ $mph$. The wind is blowing south with wind speeds of $10$ $mph$. What inlet boundary velocity value should be used?


4 / 44

Brinkman Number is defined as the ratio of

5 / 44

Which of the following flow visualization technique is useful for observing shock waves in supersonic flows?

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Which of the following statements are true regarding the "specific gravity"?

(Select the two correct answers.)

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When a force is applied to both a solid and fluid, which of the following is true?

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What is the expression of the pressure force component of surface forces in terms of surface integrals?

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Consider the barometer shown in the picture. In order to maintain the same height $h$ for the same atmospheric pressure, on a planet with twice the gravitational acceleration, we could:

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Consider the manometer shown in the picture. The pressure difference $\Delta p$ is equal to:

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For a potential flow past a circular cylinder, which of the following conditions is referred to as the D'Alembert's paradox?

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The peak of Mount Everest is at an altitude of $8.84$ $km$ above sea level. To reach the summit, climbers trek through the Everest base camp, which is at an altitude of $5.4$ $km$ above the sea level. Assuming an isothermal atmosphere (temperature, $T$), what is the ratio of atmospheric pressures at the summit to that of the base camp.

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An american football is flying horizontally in air. The plot shows the pressure contours of the ball moving from right to left. Which region has the lowest pressure?

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In the case of 2D Poiseuille flow in a 2D planar channel, the maximum velocity occurs at:

15 / 44

A system can be considered as an open system when :

(Select the three correct answers.)

16 / 44

The fundamental physical dimensions used in fluid dynamics are:

(Select the three correct answers.)

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What is a reasonable simplifying modeling assumption for air at standard temperature and pressure flowing over a uniform wing section of an aircraft?

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When a fluid is at rest, the total gravitational force exerts a ________ force on any surrounding surfaces as a result of _____________.

19 / 44

Fluid statics can be used for ______

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Consider steady laminar axisymmetric flow of a viscous fluid between two long concentric cylinders where the inner cylinder of radius $R_{i}$ is stationary while the outer cylinder of radius $R_{o}$ moves about the axis at $U$. Assuming the viscosity of the fluid to be $\mu$, the velocity can be expressed as:

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What are two reasonable simplifying modeling assumptions for a laminar jet flow from a circular nozzle?

(Select the two correct answers.)

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What is the correct value of Poiseuille number for laminar flows in round pipes?

23 / 44

What is the missing factor (?) in the non-dimensional form of the incompressible x-momentum equation? Equation is below:

$\rho^\ast\left[\frac{\partial u^\ast}{\partial t^\ast}+\mathrm{\nabla}\bullet\left({\vec{V}}^\ast u^\ast\right)\right]=-\frac{\partial p^\ast}{\partial x^\ast}+{(?)\mathrm{\nabla}}^2u^\ast$

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In a pitot tube mounted on an aircraft, what is the difference between the total and static pressures inside the total pressure tube?


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Consider an aircraft flying horizontally at an altitude of $8\ km$ with a speed of $250\ m/s$. The drag force is ______ with respect to the direction of motion of the aircraft.

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The maximum velocity in an axisymmetric fully developed flow in a round pipe (radius = $R$) (Axisymmetric Hagen-Poiseuille Flow) occurs at ($r$= radial distance from the centerline):

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In a vertical circular water pipe $3\ m$ long with constant diameter ($D = 1\ cm$), water is flowing from inlet (bottom) to outlet (top), in a direction opposite to the gravitational force. The static pressure at the inlet is $101\ kPa$ and inlet velocity is $0.001\ m/s$. Assuming water as an incompressible fluid, the static pressure at the outlet:

28 / 44

Which of the following statements are true in the context of an aircraft stall?

(Select the two correct answers.)

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Which of the following statements are true about the operation of the venturi tube :

(Select the two correct answers.)

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What does the Reynolds Number physically represent?

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The definition of an incompressible flow is: a fluid flow that always has a constant ________ .

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An airplane is traveling at a Mach Number = $2$. This means the airplane is traveling at the speed which is _______ times the local speed of sound.

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Which of the following is true when the velocity is a function of time?

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Which of the following are examples for external flows?

(Select the two correct answers.)

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In which of the following examples is it important to consider gravitational forces acting on the fluid?

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What is the integral form of the body force due to the gravitational acceleration?

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Which of the following equations represents the conversation of mass equation under the incompressible flow assumption?

38 / 44

What’s an example of a solid behaving like a fluid?

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In the case of Couette flow between two moving plates, the velocity profile is:

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The mean velocity for an axisymmetric fully developed flow in a round pipe (Axisymmetric Hagen-Poiseuille Flow) is:

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Which of the following terms represent the unsteady, time varying behavior of the conversation of mass equation?

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On this symmetric airfoil with $0$ angle of attack, where is the point of highest pressure located? Please see the image below as reference.

43 / 44

The phase of a substance depends on :

(Select the three correct answers.)

44 / 44

The sensor connected to the pitot tube on a racing car is sending a record of increasing total pressure values, while the static pressure is constant. This means that the car is

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