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GATE 2023 || Fluid Mechanics & Machinery || Quiz 9
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Question 1
A smooth flat plate of size 2m × 2m is kept immersed in water that moves with a velocity of 0.4 m/s. Find the thickness of the boundary layer at a distance of 0.75 m from the leading edge. Take the kinematic viscosity of water to be 1×10-4 m2/s.
Question 2
The drag force acts in _____ to the flow velocity.
Question 3
If x is the distance measured from the leading edge of a flat plate, the laminar boundary layer thickness varies as
Question 4
Air flows over a 10 m long plate. The transition from laminar to turbulent flow takes place between Reynolds number of 2.5 × 106 and 3.6 × 106. What is the maximum distance from the front edge of the plate along which one can expect laminar flow in the boundary layer? The free stream velocity is 30 m/s and kinematic viscosity (ν)= 1.5 ×10-5 m2/s.
Question 5
What will be the percentage change in velocity, if power to overcome aerodynamic drag of An aircraft remains same with 15% reduction in drag coefficient ?
Question 6
If the velocity distribution in a laminar boundary can be assumed as 
the ratio of momentum thickness 
to the nominal thickness 
is given by:
the ratio of momentum thickness to the nominal thickness is given by: - 86 attempts
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