2. a) A fluid of a density equal to 960 kg/m is flowing steadily through the horizontal tube shown Figure 2.1 below. The diameter at section 1 is 100 mm and at section 2 is 80 mm. Also the gauge pressure at section 1 is 200 KN/m and the velocity at the same section is 5 m/s. Find the gauge. pressure at section 2., Figure 2.1 b) A Venturi meter, shown in Figure 2.2 below, is used for measuring flow of water along a pipe. The diameter of the Venturi throat is two fifths the diameter of the pipe. The inlet and throat are connected by water filled tubes to a mercury U-tube manometer. The velocity of flow along the pipe is found to be 25vH m/s, where H is the manometer reading in metres of mercury. Determine the loss of head between inlet and throat of the Venturi when H is 0.49 m. (Relative density of mercury is 13.6). Figure 2.2 c) A centrifugal pump shown in Figure 2.3 below has a 100 mm diameter suction pipe and a 75 mm diameter delivery pipe. When discharging 15 L/s of water, the inlet-mercury manometer with one limb exposed to the atmosphere recorded a vacuum deflection of 198 mm; the mercury level on the suction side was 100 mm below the pipe centre line. The delivery pressure guage, 200 mm above the pump inlet, recorded a pressure of 0.95 bar. The measured input power was 3.2 kW. Calculate the pump efficiency. Suction pipe Delivery pipe Mercury manometer Figure 2.3 200 mm