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GATE 2020: Fluid Mechanics Quiz 13 (App update required to attempt this test)
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Question 1
The flow in a river is 1500 cumecs. A distorted model is built with horizontal scale of 1/150 and vertical scale of 1/25. The flow rate in the model should be
Question 2
A ship's model of scale 1 : 100 had a wave resistance of 1 kg at its design speed. The corresponding wave resistance in prototype will be
Question 3
In a laboratory, a flow experiment is performed over a hydraulic structure. The measured values of discharge and velocity are and 0.25 m/s, respectively. If the full scale structure (30 times bigger) is subjected to a discharge of then the time scale (model to full scale) value (up to two decimal places) is _______________
Question 4
A 1:50 model of a spillway is to be tested in the laboratory. The discharge in the prototype spillway is The corresponding discharge (in m3/s up to two decimal places) to be maintained in the model, neglecting variation in acceleration due to gravity, is __________.
Question 5
A 1: 25 model of a naval ship having a submerged area of 6 m2 and length 10 m has a total drag of 35 N when towed through water at a velocity of 2.0 m/s. Use relation for skin resistance. The value of is given by
The total drag on prototype when moving at corresponding speed is ______kN.
[Take kinematic viscosity of water (or sea water) as 0.01 stokes and the specific weight of sea water as 1000 kg/m3]
The total drag on prototype when moving at corresponding speed is ______kN.
[Take kinematic viscosity of water (or sea water) as 0.01 stokes and the specific weight of sea water as 1000 kg/m3]
Question 6
A model of submarine is scaled down to 1/25 of the prototype and is to be tested in a wind tunnel. The speed of the prototype at which we are to estimate the drag is 10 m/s. The ratio of the drag between the model and the prototype is
[Take vsea water = 1.21 x 10-2 cm2/s, vair = 1.64 x 10-1 cm2/s and psea water = 1027 kg/m3, pair = 1.34 kg/m3]
[Take vsea water = 1.21 x 10-2 cm2/s, vair = 1.64 x 10-1 cm2/s and psea water = 1027 kg/m3, pair = 1.34 kg/m3]
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