# Mcq on boundary layer theory

## Objective questions Mcq on boundary layer theory:-

1. The flow is laminar or turbulent is decided by which of the following number.
a) Reynold’s number
b) Mach number
c) Froude number
d) Knudsen number

2. The separation of flow occurs if the fluid is traveling away from the......
a) Surface of body
b) Fluid of body
d) Inter-molecular space

3. The flow is laminar (or) turbulent is decided by Reynold's number.
A. True
B. False

4. The adverse pressure gradient plays an important role in separation of the flow.
A. True
B. False

5. The swirl causing due to eddies are known as...
a) Vortices
b) Vertices
c) Volume
d) Velocity

6. The eddy viscosity is a turbulent transfer of the....
a) Fluid
b) Heat
c) Momentum
d) Pressure

7. Eddy viscosity are takes place on the large scale.
A. True
B. False

8. The laminar flow convert into the turbulent flow by which method.
b) Vacuum Gauge
c) Turbulator
d) Ionization of Gauge

9. The Boundary layer separation that does not undergo detachmenting.
a) True
b) False

10. With the boundary layer separation, the displacement thickness is......
a) Increases
b) Decreases
c) Remains Same
d) Independent

11. The instrument used for the automatic control during the fluid flow is.....
a) Rotameter
b) Pulley plate
c) Rotary Pistons
d) Pilot Static Tube

12. What is mean by rhe D’Alembert’s Paradox in fluid mechanics.
a) the Resistance= 0
b) the Drag force= 0
c)  the Temperature = 0

13. The Reynold's number for transition flow is in between 2000 to 4000.
A. True
B. False

14. The steady state flow need not be satisfy the Kirchhoff’s law.
A. True
B. False

15. The steady state flow must satisfy the which of the following law....
a) Kirchhoff’s law
b) Newtons law
c) Rutherford experiment law
d) Kepler law

16. The vertical distance from boundary surfaces in that velocity riches 99% of the free stream velocity, is called as.....
A. Laminar boundary layer
B. Turbulent boundary layer
C. Boundary layer thickness
D. None of the above

17. The vertical distance from boundary surfaces in that velocity riches 99% of the free stream velocity, is called as Boundary layer thickness.
A. True
B. False

18. The boundary layer thickness is also called as nominal thickness.
A. True
B. False

19. The boundary layer thickness is also called as disturbance thickness of the flow.
A. True
B. False

20. The velocity of distribution is parabolic in laminar boundary layer.
A. True
B. False

21. Which of the following is method to prevent flow separation.
A. Use of rough boundaries
B. By creating suction of the moving fluid
C. Bhai use of smaller divergence angle
D. All of the above

22. The flow separation in boundary layer can prevent by providing guide-blades in the band.
A. True
B. False

23. In boundary layer the shear stress is maximum at the wall.
A. True
B. False

24. For laminar zone the velocity profile will be....
A. Linear
B. Parabolic
C. Logarithmic
D. None of the above

25. For turbulent zone the velocity profile will be....
A. Linear
B. Parabolic
C. Logarithmic
D. None of the above

26. For laminar sub layer the velocity profile will be....
A. Linear
B. Parabolic
C. Logarithmic
D. None of the above

27. The velocity profile is logarithmic for turbulent zone in boundary layer theory.
A. True
B. False

28. In flow through circular pipe the mean velocity is half of the Maximum velocity.
A. True
B. False

29. The maximum velocity is twice the mean velocity when the flow flowing through a circular pipe.
A. True
B. False

30. The discharge from pipe is equal to product of area and velocity.
A. True
B. False

Here we concluding, If you have any queries about the topic of Mcq on boundary layer theory,  then feel free to comment below.

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