| The separation of boundary layer takes place when pressure gradient is |
A) zero
B) constant
C) negative
D) positive
| Boundary layer thickness is the distance from the surface of the solid body in the direction perpendicular to flow where the velocity of fluid is equal to |
A) Free stream velocity
B) 0.5 times the free stream velocity
C) 0.9 times the free stream velocity
D) 0.99 times the free stream velocity
| Boundary layer separation is caused by |
A) Boundary suction
B) Adverse pressure gradient
C) Boundary layer thickness becoming zero
D) K.E. of the fluid near boundary reducing to zero
| The existence of boundary layer is on account of |
A) fluid density
B) fluid viscosity
C) fluid turbulence
D) surface tension
| Boundary layer thickness is the |
A) distance from the boundary where velocity is 99% of the uniform velocity
B) distance from the boundary by which the main flow can be assumed to be shifted
C) distance from the boundary layer where from the flow ceases to be laminar
D) region near the boundary where viscous stress is also present
| The boundary layer exists in which of the following? |
A) Flow of real fluids
B) Flow of ideal fluids
C) Flow over flat surfaces only
D) Pipe flow only
| The growth of the turbulent boundary layer thickness as compared to the laminar boundary layer takes place |
A) at a slower rate
B) at a faster rate
C) at the same rate
D) at unpredictable rate
| Change in boundary layer from laminar to turbulent is directly affected by (i) Roughness of plate (ii) Pressure gradient (iii) Intensity of turbulence (iv) Velocity of flow Which of the above mentioned option(s) is/are incorrect? |
A) (i) and (iii)
B) (ii) and (iv)
C) Only (iii)
D) Only (iv)
