Question

CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200 mm when the difference of pressure head between the ends of the pipe 500 m apart is 4 m of water. Take the value off= 0.009 in the formula hl= a) 19.5e/s b)2.0es e)03 m's d) 29.3 e/s 2. A scale 1:50 scale model of ship is towed through sea water at a speed of 1 ms. A force of 2 N is required to tow the model. If the prototype is subjected to wave resistance only, detcrmine the propulsive force on the ship. a) 2500 kN c)250 KN d)2.5 kN b) 25000N A jet of water of diameter 75 mm strikes a stationary flat plate normally with a velocity of 20 m/s, what is the force exerted by the jet water on the stationary plate? a) 3533.6N b)26502N c 1766.8 N d) 883.4N 3. Use the following information to answer questions 4 and S The head of water from the centre of the orifice which is fitted to one side of a tank is maintained at 2 m of water. The tank is not allowed to move and the diameter of orifice is 100 mm. Take co-efficient of velocity of orifice equal to 0.97 The force excrted by the jet of water on the tank is a) 192.87 N b)289.30N e) 433.95N ) 115.72 N 4. If the tank is fitted with frictionless wheels and allowod to move then the propelling force on the tank is 5. d) 256.43 N c)384.65N a) 602.15 N b)769.3N 6. Determine the head lost to friction when water at 15 "C flows through 300 m of 150 mm diameter galvanized steel horizontal pipe at 50 litres/s. a) 17 m b)4.3 mc)67m d) 8.4 m 7. Air flows through a circular pipe of I cm diameter at an average velocity of 2 m/s Calculate the pressure drop in metres of air over a length of 5 m. Take viscosity and density of air as μ-1983x 10.5 kg/ms, p-1.1774 kg/m, a) 3.653 m b)4.3 m 0.0358 m d) 1.83 m In a journal-bearing arrangement, the shaft diameter is 120 mm and the bearing internal diameter 123 mm. The lubricant used has a viscosity of 0.096 kg/ms. Calculate the power required to overcome friction when the shaft is rotated at 1500 rpm and is concentric with the bearing. The bearing length is 150 mm. a) 603.13 w b)32135 w 8. c)34.1Wd) 9.42 w 5 of 9

Answer 1

200 m 4 2 4 = 29.31