Level 3 BTEC Hydraulics & Pneumatics Assignment helpWatch
1). The input and output pistons of a hydraulic jack are respectively 2cm and 6cm in diameter. A lever with a mechanical advantage of 4 is used to apply force to the input piston. How much mass can the jack lift if a force of 160N is applied to the lever and efficiency is 90%?
2) Fig 1 shows a hydraulically operated garage ramp. The mass of the movable section is 600kg and the mass of the car on it is 1240kg. The piston in the ramp has a diameter of 300mm. What is the minimum hydraulic pressure needed to raise the car? Give your answer in Pascals, bar and psi.
3) A container has a volume of 0.20m³ is filled with compressed air at a gauge pressure of 700kPa and a temperature of 50°C. If the atmospheric pressure is 101kPa, determine the gauge pressure in the container when the air cools to 15°C. Neglect any change in dimension of the container as a result of the temperature change.
4) (a) A compressor has a rated output of 3m³min free air delivery at n.t.p. What will be the output at an absolute pressure of 700kPa and 20oC?
(b) A compressor is required to deliver 0.2m³min of compressed air at an absolute pressure of 500kPa and temperature 25°C. What compressor output is required in terms of free air at n.t.p.
5) (a) Determine the power required to pump oil at a pressure of 7MPa with a speed of 3.5ms in a 30mm diameter pipe.
(b) Determine the flow velocity in a pipe 25mm in diameter when the delivery pressure is 6MPa and the power output is 10kW.