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Q1— Section header —
1.1Define the terms concerning fluid and write down the unit of measure ment for each one
1.1.1Specific weight
1.1.2Relative density
1.1.3
1.2A 300 drum is filled with oil with a relative density of 0,96. Determine:
1.2.1The specific weight of the oil
1.2.2
1.3A piston moves (slides\ inside a cylinder at an average velocity of 3,25 m/s. The cylinder has an inside diameter of 310 mm and the piston diameter is 309 ,5 mm with a length of 200 mm. The piston is lubricated with
1.3.1The force to overcome viscous resistance inside the cylinder (8\
1.3.2The power loss due to viscous resistance inside the cylinder (2\ [20]20
Q2— Section header —
2.1Define and state its application and units. (3\
2.2A hydraulic brake system is used as a test rig and t he following specifications of the device were collected from the experiment: Master cylinder
2.2.1The pressure exerted by the pedal on the master cylinder during the test (3\ 8190205
2.2.2The distance the pedal should move in order to move the slave cylinder for 7,41 mm per stroke (4\
2.3A single rod double acting hydraulic actuator has a stroke length of 400 mm with a diameter of 210 mm. The rod diameter is 60 mm and it is fed with a flow rate of
2.3.1Time taken for the forward and return strokes (8\
2.3.2The pressure induced on the piston on the side where the rod is (2\ [20]20
Q3— Section header —
3.1A drum which is 6 m long and which has an internal diameter of 3,6 m is filled with oil with a relative density of 0,84. The total ma ss of the empty drum is 90 kg.
3.1.1Calculate the force exerted by the drum (filled with oil\ on the surface of seawater.
3.1.2
3.2A solid steel pipe which is 3,8 m long and which has a diameter of 1,55 m , is fl oating
3.2.1The mass of the solid pipe (5\
3.2.2The mass of the load that enables the pipe to float just below the water surface NOTE:
3.2.3The hydrostatic force on one of the circular sid es if the solid pipe when it floats horizontally 2,25 m below the surface of the water (4\ [20]20
5.2Oil with a density of 900 kg/m is flowing in a pipeline system with a diameter of 350 mm. A pitot tube is used as a flow velocity measuring tool. The pressure difference between the pitot tube orifice and the static orifice energy
5.3pipe with a 50 mm diameter has a sudden reduction in diameter to 20 mm he flow rate in the system is
5.3.1The change in velocity head (6\
5.3.2The head loss due to the sudden reduction in diameter if C = 0,7 (2\ [20]20
Q6— Section header —
6.1Briefly explain the function of a pump in a hydr aulic system (2\
6.2A hydra lic reservoir pressurised to 12,5 kPa contains a fluid with a density of 960 kg/m . The reservoir
6.2.1The total length to diameter ratio of the system ( gnore entrance loss to the pipe (6\
6.2.2The total head loss throughout the system (4\
6.2.3The fluid power the pump requires to operate the actuator (4\
6.2.4The head loss across the filter fitting (4\ [20] TOTAL: 6/ ls ls20