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GATE 2020: Fluid Mechanics Quiz 11
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Question 1
A body is said to be provided optimum amount of streamlining when ______.
Question 2
At what distance from the boundary layer (i.e. distance from pipe wall) , the value of the wall shear is three times of turbulent shear?
Question 3
An automobile with projected area 2.6 m2 is running on a road with a speed of 120 km per hour. The mass density and the kinematic viscosity of air are 1.2 kg/m2 and 1.5 × 10–5 m2/s, respectively. The drag coefficient is 0.30.
The drag force on the automobile is
Question 4
A flat plate 2 m long and 1.5 m wide is towed at 25 km/h in water. The drag and lift coefficients are found to be 0.20 and 0.60 respectively. The power (in kW) required to keep the plate in motion is
Question 5
A man, 65 kg, descends to the ground with the help of a parachute, 18 kg. The parachute is hemispherical in shape, 2m diameter. Density of air can be taken as 0.00125 g/cm3 and its kinematic viscosity as 0.15 stoke. What is the terminal velocity of the parachute?
(Take CD = 1.5 and g = 1000 cm/sec2)
(Take CD = 1.5 and g = 1000 cm/sec2)
Question 6
The thickness of the laminar boundary layer over a flat plate at two different sections P and Q are 0.8 cm and 2.4 cm respectively. If the section Q is 3.6m downstream of P, the distance of section P from the leading edge of the plate is
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