Question 11 : Molecules of fluids get attracted due to
1. trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
2. rectangular weir whose length is kept 3 times the height of the water above sill
3. a combination of rectangular and triangular weirs.
4. triangular weir whose notch angle is 90°
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Question 12 : Cappoletti weir is a
1. trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
2. rectangular weir whose length is kept 3 times the height of the water above sill
3. a combination of rectangular and triangular weirs.
4. triangular weir whose notch angle is 90°
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Question 13 : Which one of the following statements is true ?
1. The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06
2. The value of kinetic energy correction factor for laminar flow is 2
3. all
4. The practical value of kinetic energy correction factor for turbulent flow is unity
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Question 14 : Uniform flow is said to occur when
1. frictional loss in the particular length of the channel will the more than the drop in its elevation
2. size and shape of the cross-section change along a length
3. frictional loss in the particular length of the channel, will be less than the drop in elevation.
4. size and shape of the cross-section in a particular length remain constant
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Question 15 : The best side slope for most economical trapezoidal section, is
1. 60°
2. 45°
3. 30°
4. None of these.
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Question 16 : When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as
1. free nappe
2. none of these.
3. clinging nappe
4. depressed nappe
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Question 17 : Discharge over an ogee weir remains the same as that of
1. sharp crested weir
2. cippoletti weir
3. triangular weir
4. drowned weir.
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Question 18 : Fluids change the volume under external presssure due to
1. none of these.
2. viscosity
3. plasticity
4. compressibility
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Question 19 : If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be
1. uniform flow
2. turbulent flow
3. laminar
4. non-uniform flow.
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Question 20 : The rise of the liquid along the walls of a revolving cylinder above the initial level, is
1. the same as the depression of the liquid at the axis of rotation
2. none of these.
3. lesser than the depression of the liquid at the axis of rotation
4. greater than the depression of the liquid at the axis of rotation
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