GATE ME 2023 | Boundary Layer Question 1 | Fluid Mechanics

GATE ME 2023

MCQ (Single Correct Answer)

-0.33

Air (density = 1.2 kg/m³, kinematic viscosity = 1.5 × 10^-5 m²/s) flows over a flat plate with a free-stream velocity of 2 m/s. The wall shear stress at a location 15 mm from the leading edge is τ_w. What is the wall shear stress at a location 30 mm from the leading edge?

τ_w/2

√2τw

2 τw

τ_w/√2

GATE ME 2015 Set 2

MCQ (Single Correct Answer)

-0.3

Within a boundary layer for a steady incompressible flow, the Bernoulli equation

holds because the flow is steady

holds because the flow is incompressible

holds because the flow is transitional

does not hold because the flow is frictional

GATE ME 2007

MCQ (Single Correct Answer)

-0.3

Consider an incompressible laminar boundary layer flow over a flat plate of length $$L$$, aligned with the direction of an incoming uniform free stream. If $$F$$ is the ratio of the drag force on the front half of the plate to the drag force on the rear half, then

$$F < {\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}$$

$$F = {\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}$$

$$F=1$$

$$F>1$$

GATE ME 2002

MCQ (Single Correct Answer)

-0.3

Flow separation in flow past a solid object is caused by

A reduction of pressure to vapour pressure

A negative pressure gradient

A positive pressure gradient

The boundary layer thickness reducing to zero