Q. If liquid pressure is increased from 4000 kN/m² to (b) Ir 6000 kN/m², the volume of liquid decreased by 0.2 percent, Determine the bulk modulus of elasticity of the liquid. SOLUTION: Bulk modulus of elasticity K = – (dp)/((dv)/v) Change in pressure p = 6000 – 4000 = 2000kN / (m ^ 2) =(dv)/v … Read more
Q. The specific gravity and dynamic viscosity of a certain liquid are 2.0 and 1.3N- S/ (m ^ 2) respectively. Calculate the kinematic viscosity of the liquid. SOLUTION: Kinematic viscosity = μ/ρ Dynamic viscosity μ= 1.3 N- S / (m ^ 2) Specific gravity S = 2.0 Specific gravity= specific weight of liquid/ specific weight … Read more
Q. At a point of layer of oil, the shear stress is 0.2 N/m² and velocity gradient is 0.25 m/sec/m. Calculate the coefficient of dynamic. SOLUTION: Shear stress τ= 0.2N / (m ^ 2) Velocity gradient, (dv)/(dy) =0.25 m/sec/m From the relationship, τ=μ * dv/dy 0.2 = μ * 0.25 μ = 0.8N -sec/m^ 2 … Read more
Q. A plate 10 mm distant from a fixed plate moves at 2 m/s and requires a force of 300 N/m² to maintain this speed. Determine dynamic viscosity of the fluid between the plates, SOLUTION: Shear stress τ=μ * dv/dy τ = 300Nm^2 dv = change of velocity = 2m / s dy = distance … Read more
.Q. Find the values of absolute pressure given that (a) Pressure gauge reading as 150 kPa, (b) Vacuum gauge reading as 40 hPa, when the atmospheric pressure is 101.3 kPa. Given data: Atmospheric pressure=101.3 kPa Gauge pressure = 150kPa Vacuum pressure = 40kPa SOLUTION: (a) Absolute Pressure = atmospheric pressure + gauge pressure = 101.3 … Read more
Q. Calculate the density, specific weight and weight of one litre of petrol of specific gravity = 0.7. SOLUTION: Volume 1 litre = 1 x 1000 cm³ =1000/10^6= 0.001m³ Sp. gravity S =0.7 (1) DENSITY Density (p) = S x 1000 kg/m³ = 0.7 x 1000= 700 kg/m³ (II) SPECIFIC GRAVITY (W) w =ρ *g … Read more
Q. If 12m ^ 3 of mercury weights 1590 kN, Calculate specific weight, mass density, specific gravity and specific volume. SOLUTION: Given data: Weight of mercury W = 1590kN = 1590 * 1000N Volume, V = 12m ^ 3 Specific weight = ? Specific gravity = ? Mass density = ? Specific volume = ? … Read more
Q. Calculate the Specific weight and mass density of an oil of weight 150 kN and occupies a volume of 15 m³. SOLUTION Weight of oil, W = 150kN = 150 * 1000N Volume of oil V = 15m ^ 3 Specific weight of oil w = ? Mass density ρ = ? SPECIFIC WEIGHT … Read more
Q. Calculate the specific mass, specific weight and specifie gravity of one litre of liquid their weights 12N. Solution: Volume of liquid V = 1 litre Weight of liquid w = 12N MASS m = w/g = 12/9.81 = 1.223kg SPECIFIC MASS = mass/ volume = (1223g)/(1000c * m ^ 3) = 1.223g / cm^3 … Read more
FLOW THROUGH ORIFICE AND MOUTHPIECES Flow through orifice and mouthpiece Users measure the rate of flow of liquid using both the orifices and mouthpieces. ORIFICE An orifice is a small opening of any cross section (such as Fe circular, square, triangular, rectangular etc.) made in the walls or the bottom of a tank containing liquid, … Read more