Theory-based Quiz

Total time - 60 mins.

Total number of Questions - 45

Times up!


Basics of Fluid Dynamics ITC

 

If you get stuck, you can skip the current question and navigate between the different questions by using the "Previous" and "Next" buttons.

Once you have finished the exam, click on the 'Mark Complete' button to save your progress and move to the next section.

1 / 44

For a fluid flow to be considered a steady flow, it must be:

2 / 44

Brinkman Number is defined as the ratio of

3 / 44

Which of the following are examples of internal flows?

(Select the two correct answers.)

4 / 44

An altimeter uses _______ to measure altitude.

5 / 44

A system can be considered as an open system when :

(Select the three correct answers.)

6 / 44

Which of the following is true about Taylor number ($Ta$)?

(Select the two correct answers.)

7 / 44

Which of the following statements are true for irrotational flows?

(Select the two correct answers.)

8 / 44

The dynamic viscosity for a non-newtonian fluid is a function of which of the following?

9 / 44

Which of the following is an example of 'internal flow'?

(Select the two correct answers.)

10 / 44

An isothermal incompressible fluid flows through a perfectly insulated coiled tube. To describe the problem, how many unknowns need to be solved for from the system of equations ?

11 / 44

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

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

12 / 44

Using the Stokes' approximation, you were asked to calculate the non-dimensional drag coefficient for a creeping flow around a cylinder (under 2D assumptions). What do you find out?

13 / 44

When comparing with experiments, the validity range of Oseen's approximation for low Reynolds number flows was found to be _____

14 / 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

15 / 44

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

16 / 44

Which of the following is caused by the surface tension of a fluid?

(Select the two correct answers.)

17 / 44

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

18 / 44

What does the Reynolds Number physically represent?

19 / 44

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.

20 / 44

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:

21 / 44

The liquid in a manometer is at the same height on both the tubes. This means that:

22 / 44

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

23 / 44

What are the basic elements of a mathematical model of a fluid dynamics problem?

(Select the three correct answers.)

24 / 44

Which of these statements is true about 2D planar simplification?

(Select the two correct answers.)

25 / 44

Which of the following is a non-intrusive (i.e. the measurement process does not disturb the flow) method of measuring temperature?

26 / 44

The following measurement technique is applicable for measuring velocity :

(Select the two correct answers.)

27 / 44

Given basic dimensions of mass $M$, length $L$ and time $T$, what would be dimensions of Energy/Work:

28 / 44

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

29 / 44

Which of the following is the correct expression for skin friction coefficient for laminar flows in round pipes? ($Re_{D}=\frac{\rho \bar{u}D}{\mu}$)

30 / 44

What is the definition of the Knudsen number?

31 / 44

$1/5^{th}$ model of car is tested in a wind tunnel. For the flow over the test model to be dynamically similar to that of the full-scale car, the wind tunnel velocity for the model must be: [Hint: both the model and full-scale car are being tested in the same wind-tunnel].

32 / 44

Which of the following represents the Fourier's Law? ($k$ is the thermal conductivity of the fluid)

33 / 44

The fundamental physical dimensions used in fluid dynamics are:

(Select the three correct answers.)

34 / 44

Given the fluid velocity field $\overline{V}$, Which of the following is the correct expression for vorticity?

35 / 44

Consider a body moving through a viscous fluid. The magnitude of the normal component of the viscous stress acting on the body surface is:

36 / 44

Consider a hot air balloon up in the air that is subject to neutral buoyancy. The weight of the balloon structure cannot be neglected.

The balloon can drop altitude if :

(Select the two correct answers.)

37 / 44

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

 

38 / 44

Poiseuille (pipe) flows are laminar for:

39 / 44

In which of the following cases does pressure drag dominate compared to the viscous drag?

40 / 44

Which fundamental law of physics is the foundation for the conservation of momentum?

41 / 44

The fluid flow over which of the following cases can be considered as a supersonic flow?

42 / 44

Consider the barometer shown in the picture. If the atmospheric pressure decreases, then the height $h$:

43 / 44

The velocity profile corresponding to an axisymmetric fully developed flow in a round pipe (Axisymmetric Hagen-Poiseuille Flow) is

44 / 44

Two different incompressible laminar fluid flows - $A$ and $B$, through identical venturi tubes such that the pressure drop across the two venturi tubes is the same for both the fluids. If we know that the density of fluid $B$ ($\rho_B$) is four times that of fluid $A$ ($\rho_A$), then which of the following statements is true?

(Select the two correct answers.)

Your score is

0%