Civil Engineering Hydraulics/Fluid Mechanics Mock test – 3

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1. When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as
2. 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
3. Discharge over an ogee weir remains the same as that of
4. For exerting a pressure of 4.8 kg/cm2, the depth of oil (specific gravity 0.8), should be
5. Cappoletti weir is a
6. The following is not a laminar flow
7. Dimensions of the dynamic viscosity (μ) are
8. f total head available at the inlet of pipe and f1 is the loss of head due to friction in the pipe, the maximum efficiency of transmission of power (ηmax) is
9. Atmospheric pressure is equal to water column head of
10. The value of momentum correction factor (β) for a laminar flow through a circular pipe, is
11. For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is
12. Manometers are used to measure
13. To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than
14. The best side slope for most economical trapezoidal section, is
15. On an inclined plane, centre of pressure is located
16. To avoid an interruption in the flow of a syphon, an air vessel is provided
17. An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to
18. Uniform flow is said to occur when
19. In an open tube, free surface of mercury remains
20. Piezometers are used to measure
21. Shear stress is directly proportional to
22. Fluids change the volume under external presssure due to
23. Molecules of fluids get attracted due to
24. Most economical section of a triangular channel, is
25. The rise of the liquid along the walls of a revolving cylinder above the initial level, is

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