3. A small wind turbine with a blade of diameter 200 CP cm is subjected to a wind turbine with upwind velocity of 12 m/s and downwind velocity of8 m/s. Calculate the power and energy produced by the turbine per year (Density of air is 1.3 kg/m³).
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- Wind mill with 2 m diameter works on the principle of converting kinetic energy of the wind in to mechanical energy. If air density = 1.225 Kg. / m°wind speed 20 m/sec then power available from wind mill is 30787.6 w 30787.1 w 30787.3 wSteam enters an adiabatic turbine at 6 MPa and 550 °C and leaves at 10 kPa and 50 °C. If the environment temperature and pressure is 0 °C and 103.325, what is the second law efficiency of the turbine? O a. 0.70 O b. 0.75 O c. 0.81 O d. 0.72 O e. 0.7811. The eddy current loss of a given solid core is 80 W at 50 Hz. What would be the loss of 60 Hz if the core flux density remained the same at the two frequencies. Answer: 115.2 W a. 55.55 W b. 66.67 W c. 96 W d. 115.2 W
- Amagnetic field is being generated by a current of 2.0A flowing through 180 turns of wire on a core having a reluctance of 210000.0 At/Wb. Determine the flux of the circuit in mWb.The equivalent inertia constant (in MJ/MVA) on a common base 100 MVA for shown figure is 400MVA, 5MJ/MVA 200MVA, 5MJ/MVAA dc separate excited generator operate at speed = 1500 R.P.M at a certain excitation gives a voltage = 180 Volt. Its voltage at speed 110 rad/sec and half excitation is: 065.23 V. 070.15 V. 063.02 V. ONone.
- A ferromagnetic core is shown in Figure 1. There is a small gap of0.07 cm in the structure of the core and the other dimensions' values of the core are shown in the Figure 1. The depth of the core is 5 cm. The rdative permeability of the core is 850 and has 300 turns of coil wire. Assumethat fringing in the airgap has increased the effective cross-sectional area by 5 percent. a) Draw the magnetic equivalent cireuit. Define all the label in your sketch correctly. b) Calculate the total reluctance, Rrotal of the ferromagnetic core including the air gap. c) If3 A input current is injected to the coil, determine the total flux, Orotal that will be produced. d) Determine the magnetic flux density, B in the air-gap and in the bottom core of the magnetic system. 15 cm 5 cm 10 ст 0.07 cm 5 cm 20 cm 300 tums 10 cm Figure 1: Ferromagnetic CoreA ring of ferromagnetic material has a rectangular section. The inner diameter is 15 cm.The outer diameter is 24 cm. And the thickness is 5 cm. There is a coil of 500 turns wound onthe ring. When the coil has a current of 10 A, the flux in the core is 0.0007 Wb. Theaverage length of the ring is Ln=0.66m Determine:a) The magnetomotive force.b) The intensity of the magnetic field and the flux density.c) Reluctance, permeability and relative permeability.Comment Shard Q9: Salalah city is planning to install a 3.0 MW wind turbine. The turbine has a 112 m rotor diameter and the power/speed curve shown in Figure Q9. During the daytime hours (7am to 7pm) the wind speed is 12 m/s and the cost of electricity is $100/MWh. During the nighttime hours the cost of electricity is $50/MWh and the wind speed is 6 m/s. Assume that the air density is constant at 1.2 kg/m³. Determine the power output, wind power input, and efficiency of the turbine/generator during the daytime hours. Determine the power output, wind power input, and efficiency of the turbine/generator during the nighttime hours Calculate the daily revenue that the plant earns from selling electricity. 3,000 2,500 2,000 1,500 1.c00 s00 25 Outout kW)
- a rectangular ferromagnetic core 40 x 60 mm has a flux φ = 1.44 mwb. an air gap in the core is of length la = 2.5 mm. find the ni drop across the air gap.c dep15m Problem 2 A ferromagnetic core with a relative permeability of 2000 is shown in Figure. The dimensions are as shown in the - 30 cm 30 cm 7 cm diagram, and the depth of the core is 7 cm. The air gaps on the left and right sides of the core are 0.050 and 0.070 cm, respectively. If there are 300 turns in the coil wrapped around the center leg of the core and if the current in the coil is 1.0 A, what is the flux in each of the left, center, and right legs of the core? What is the flux density in each air gap? 30 cm 0.05 cm 300 turns 0.07 cm 7 cmA generator of 200MVA rating has an inertia constant of 10MJ/MVA. With the same rotor, if the rating is changed to 400MVA, then the inertia constant (in MJ/MVA) becomes