Fluid Mechanics — Quiz 2

Questions in this quiz (5)

1. A hydraulic turbine operates at $$250\ rpm$$ and produces $$3500\ kW$$ under a head of $$60\ m$$. Determine the power specific speed using $$N_{sp}=\frac{N\sqrt{P}}{H^{5/4}}$$.

   • 61
   • 78
   • 95
   • 112

2. A vertical rectangular gate is $$1.8\ m$$ wide and $$2.5\ m$$ tall. The top edge of the gate is located $$0.8\ m$$ below the water surface. Assuming $$\rho=1000\ kg/m^3$$ and $$g=9.81\ m/s^2$$, determine the total hydrostatic force acting on one side of the gate.

   • 132.4 kN
   • 98.7 kN
   • 164.2 kN
   • 74.5 kN

3. Water discharges through a sharp-edged circular orifice with a diameter of $$60\ mm$$ under a constant head of $$2.5\ m$$. Assuming a discharge coefficient of $$0.62$$ and $$g=9.81\ m/s^2$$, determine the flow rate.

   • 8.7 L/s
   • 6.4 L/s
   • 10.2 L/s
   • 7.5 L/s

4. A water jet with diameter $$70\ mm$$ and velocity $$12\ m/s$$ strikes a stationary flat plate perpendicularly. Assuming $$\rho=1000\ kg/m^3$$, determine the force exerted on the plate by the jet.

   • 0.65 kN
   • 0.92 kN
   • 1.08 kN
   • 0.48 kN

5. Water has a bulk modulus of $$2.1\ GPa$$. Determine the pressure increase required to reduce the volume of water by $$0.8\%$$.

   • 16.8 MPa
   • 21.0 MPa
   • 12.5 MPa
   • 8.4 MPa