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GATE Prev Year : Fluid Mechanics Test-7
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Question 1
At the solid walls of the body the fluid satisfies a no-slip boundary condition and has zero velocity, but as you move away from the wall, the velocity of the flow asymptotically approaches the free stream mean velocity. Therefore it is impossible to define a clear point at which the boundary layer becomes the free stream.
Which among the following information supports as per thickness of boundary layer?
Question 2
The turbulent boundary later occurs due to:
Question 3
Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Acceleration due to gravity is 9.81 m/s2. Assuming steady, inviscid flow, constant atmospheric pressure everywhere and neglecting curvature and surface tension effects, the diameter in mm of the stream 0.5 m below the tap is approximately
Question 4
An object having a volume of 5 x 10-3 m3 floats in a liquid having density of 1500 kg/m3. if its 60% volume is above liquid surface level, Then calculate the weight of the object. (g=10m/s2)
Question 5
Water in a pipe is flowing at speed of 25m/s with pressure 550kN/m2 which is 45m above sea level. What will be the total head of water in meters?
Question 6
The head loss for a laminar incompressible flow through a horizontal circular pipe is h1. Pipe length and fluid remaining the same, if the average flow velocity doubles and the pipe diameter reduces to half its previous value, the head loss is h2.The ratio h2/h1 is
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