Hydraulics and Fluid Mechanics Questions

• A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
• The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)
• The discharge over a rectangular notch is
• A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)
• The vacuum pressure can be measured with the help of a piezometer tube.
• According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.
• The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
• Water is a __________ fluid.
• Falling drops of water become spheres due to the property of
• If the value of coefficient of discharge increases, the discharge through the orifice decreases.
• The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
• A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
• The pressure of the liquid flowing through the divergent portion of a venturimeter
• When the Mach number is between __________ the flow is called super-sonic flow.
• A manometer is used to measure
• The product of mass and accelaration of flowing liquid is called
• A notch is used to measure __________ of liquids.
• The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is
• The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
• The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)