A. < 1
B. 1
C. > 1
D. 2
Related Mcqs:
- In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as: (where, ‘δ’ is the boundary layer thickness and ‘x’ is the distance from the leading edge in the direction of flow)?
A. Re
B. √Re
C. 1/Re
D. Re-1/2 - What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?
A. 0.5
B. 1
C. 1.5
D. 2 - Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton’s law of viscosity. (II) Newton’s second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary?
A. I, II, III
B. II, III, V
C. I, II, V
D. II, IV, V - The hydrodynamic and thermal boundary layers will merge, when ____________________?
A. Prandtl number is one
B. Schmidt number tends to infinity
C. Nusselt number tends to infinity
D. Archimedes number is greater than 10000 - The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids ?
A. Having high viscosities
B. Moving at low velocities
C. Both A. & B.
D. Neither A. nor B. - The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynold’s number?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease - Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ?
A. √d
B. d1/3
C. d2
D. d2/3 - Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ?
A. √d
B. d2/3
C. d4/5
D. d1/3 - For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?
A. √x
B. 1/√x
C. x
D. 1/x - Boundary layer exists in flow_________________?
A. Of real fluids
B. Over flat surfaces only
C. In pipes only
D. Of ideal fluids only
