STUPIDSID
Solve any four question from Q.1(a, b, c, d, e,f)
1(a)
Explain the significance of channels of most efficient sections.
5 M
1(b)
How hydraulic jump is classified accroding to Froude number of incoming supercritical flow.
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1(c)
Derive expression for energy loss in hydraulic jump.
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1(d)
What is meant by Magnus effect.
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1(e)
What do you understand by displacement thickness and momentum thickness of boundary layer.
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1(f)
Write design steps in Kennedy's theory of unlined alluvial channels.
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2(a)
A trapezoidal channel to carry 142 m3 min of water is designed to have a minimum cross section find the bottom width and depth if the bottom slope is 1 in 1200, the side slopes at 45° and chezy's constant C = 55.
10 M
2(b)
The discharge of water through a rectangular channel of width 6m is 18m3 when depth of flow of water is 2m. Calculate specific energy of flowing water, critical depth, critical velocity and minimum specific energy.
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3(a)
Derive dynamic equation of gradually varied flow.
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3(b)
A cylinder 1.2m in diameter is rotated about its axis in air having a velocity of 128 km/hr. A lift of 5886N/m length of cylinder is developed in the body. Assuming ideal fluid theory , find the rotational speed and location of stagnation points. Given density of air is equal to 1236 kg/m3.
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4(a)
Determine the thickness of boundary layer at tailing edge of smooth plate of length 4m and of width 1.5m, when the plate is moving with a velocity of 4 m/s in stationary air. Take kinematic viscosity of air as 1.5×10-5 m2/s. Also, determine the total drag on one side of the plate assuming that the boundary layer is laminar over entire length of plate taking density of air 1.226kg/m3
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4(b)
Explain the terms: terminal velocity, circulation, pressure drag, profile drag and friction drag.
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5(a)
Describe method of designing a canal based on Lacey's theory.
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5(b)
Design a channel section by Kennedy's theory, for a given data
Discharge is 28 cumecs
Kutters constant N is 0.0225
Critical velocity ratio is 1
B/D = 7.6
Find also the bed slope of channel
Discharge is 28 cumecs
Kutters constant N is 0.0225
Critical velocity ratio is 1
B/D = 7.6
Find also the bed slope of channel
10 M
6(1)
A rectangular channel of width 4m is having bed slope of 1 in 1500. Find the maximum discharge through the channel. Take C = 50.
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6(2)
A circular disc 3m in diameter is held normal to a 26.4 m/s wind of density 0.012 gm/cc. What force is required to hold it at rest. Assume coefficient of drag of disc is 1.1.
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6(3)
Derive conditions for most economical rectangular section.
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6(4)
Write a applications of hydraulic jump.
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