A pump extracts the energy of a fluid, while a turbine delivers energy to the fluid. True or False
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A pump extracts the energy of a fluid, while a turbine delivers energy to the fluid.
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- The device that stores the potential energy of an incompressible fluid is O a. pressure absorbing valve. O b. pressure reducing valve. O C. accumulator. O d. pressure relief valve.QUESTION 3 Which of these cannot be an assumption used in modeling an ideal compressor/pump? (... Negligible external work done Negligible change in kinetic energy Negligible change in potential energy Negligible heat transfer with the surroundings Negligible change in enthalpy ATA QUESTION 4 Which of these cannot be an assumption used in modeling an ideal nozzle? Negligible external work done Negligible change in kinetic energy Negligible change in potential energy Negligible heat transfer with the surroundings Negligible change in enthalpy1. The mean effective pressure of an engine running at 300 rpm is 500 kPa. What is the indicatedpower if the engine has bore of 250 mm x 450 mm. Select the correct answer below: A. 110.5 kW B. 150 kW C. 200 kW D. 182. 2 kW 2. In a certain process, entering is 1500 KJ/kg and 150 m/s. If the energy leaving is 12000 Kj/kg/ Determine the velocity at exit. Select the correct answer below: A.) 145 m/s B. 1020 m/s C. 789 m/s D. 978 m/s
- What is the fact that at some speed the volumetric efficiency of an engine is maximum, however it decreases gradually at the start and end.Task 1 Derive the non-flow and flow energy equations from first thermodynamic principles. Task 2 Apply the steady flow energy equation to nozzle, compressor, turbine, boiler, and mixing chamber. Task 3 A turbine powers an air compressor and a generator. The turbine is supplied with 25 kg/s of steam. The compressor is supplied with 15 kg/s of air. Given the following conditions as presented in the figure below determine the net power in kW to the generator. 98 kPa 12.5 MPa 295 K 500 C Air To the Steam kg/s generator 1MPA 620 K 10 kPa x=0.92The cutout wind speed denotes how fast the turbine can go before wind speeds get so fast. The maximum range of cutout wind speed (Vo)that seas' the wind power generation is: 3 < Vo < 5 m/s. 20 < Vo < 30 m/s. 200< Vo < 300 m/s None of the above.
- a.Which of the following appropriately describes the pumping energy efficiency when a pump is transferring water150 l/s (liters per second) with 1 bar pressure difference and the power consumption is 21 kW? 1.59 % 2.140kW/s 3.21kW /bar 4.39 Wh/m1.In the cylinder of an air motor, the compressed air at the beginning of an expansion cycle has an internal energy of 500 kJ/kg and after expansion an internal energy of 150 kJ/kg. Calculate the heat flow from or to the system, when the work done by the air during expansion is 200 kJ/kg 2. The heat loss in a certain non-flow process is 785 kJ. The internal energy increases by 522 kJ. How much work is being done? 3. In the compression stroke of an internal combustion engine the heat rejected to the cooling water is 45 kJ/kg and the work input is 90 kJ/kg. Calculate the change in specific internal energy of the working fluid stating whether it is a gain or a loss. 4.If the Control Volume is initially a vacuum, the initial mass and energy of the system is zero Select one: O True O False Nozzle: Kinetic Energy; Turbine: Select one: O a. Pressure O b. Work O c. Velocity O d. Heat e. None of the above (all four other choices are incorrect)
- I need the answer at 20 minute03: A nozzle is a device for increasing the velocity of a steadily flowing stream of fluid. At the inlet to a certain nozzle the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s. At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle is horizontal and there is negligible heat loss from it. (a) Find the velocity at the nozzle exit. (b) If the rate of flow of fluid is 31.6 kg/s and the specific volume at the inlet is 0.19 m'/kg, find the inlet area. (c) If the specific volume at the nozzle exit is 0.5 m/kg, find the exit area of the nozzle.30. Steam enters a turbine 80 lbs of steam per minute with an enthalpy of 1700 BTU/lb and velocity of 98 ft/s. It leaves the turbine at 1400 BTU/lb at 880 ft/s. The heat loss is 90,000 BTU/hr. Find the horsepower output of the turbine.