Hydraulics Online Test – Multiple Choice Questions and Answers 1. 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 Froude number Weber number Reynold number Mach number 2. A jet projected at an angle of 45θ, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is 10 m 12 m 15 m 40 m 3. In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be 2 mm 4 mm 6 mm 8 mm 4. The velocity of the fluid particle at the centre of the pipe section, is maximum equal throughout minimum none of these 5. When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe decreases the discharge increases the discharge does not effect the discharge none of these 6. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing Weber number Mach number Reynold number Froude number 7. Mach number is the ratio of inertia force to viscosity surface tension gravitational force elasticity 8. Cavitation is caused by Low velocity High pressure Low pressure High velocity 9. To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than 2.4 m 5.0 m 6.4 m 10.0 m 10. To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is 2° 3° 4° 6° Loading … Question 1 of 10
