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- A hydro-electrie station is operated with a mean head (h) of 30 m and consume (discharge water) 218.75 * 10 6 m3 of water in one ycar for the average load. The expected load factor for the station is 80 %. Calculate the power in Kw for which the station should be designed (max.load). Assume that the mechanical efficiency of the turbine is 90% and the efficiency of the generator is 95%,An air conditioner draws 18 A at 220-V ac. The connectingcord is copper wire with a diameter of 1.628 mm. (a) Howmuch power does the air conditioner draw? (b) If the lengthof the cord (containing two wires) is 3.5 m, how much power isdissipated in the wiring? (c) If no. 12 wire, with a diameterof 2.053 mm, was used instead, how much power would bedissipated in the wiring? (d) Assuming that the air conditioner is run 12 h per day, how much money per month(30 days) would be saved by using no. 12 wire? Assumethat the cost of electricity is 12 cents per kWh.Determine the symmetrical components of the three currents ?? = 10 ∠ 0A; ?? =100 ∠ 2500 A; and ?? = 10 ∠ 1100 A.
- 62. A power plant costumer draws power at 220 volts from transformers on a pole. Current transformers with ratio of 200/5 are used to meter the electrical usage. What is the multiplier of the kW-hr and demand meters? a. 50 b. 45 c. 40 d. 55hydro-electric generating plant is supplied from a reservoir of capacity 20000000m3 with a head of 200m. The hydraulic efficiency of the plant is 0.8 and the electric efficiency is 0.9. What is the total available energy?A resistor, in series with a 138-microfarad capacitor, is connected to a 60-cycle source.If the voltage drop across the capacitor is 115 volts and the power taken by the circuitis 922 watts, calculate (a) the circuit current, (b) the ohmic value of the resistor, (c) theline voltage, (d) the circuit power factor. draw the circuit diagram
- A 60Hz sourcewith an effective voltage of 240 volts supplies 4500 volt-amp to a load with a p.f. of 0.75 lagging. Determine the parallel capacitance required to improve the power factor to: a) 0.9 lagging and b) 0.9 leading. What per cent reduction in line current resulted in part (a)?1) Find the Io current? 2)Did you find the VAB line voltage on the loads? 3)Find the line voltage Vca on the voltage sources side?Calculate ( C ) Load current, Calculate ( D ) Power in the load resistor or Power in the 50 ohms resistor, Calculate ( B ) Rth, Calculate ( A) Vth
- In a house there is a three-wire system configured as follows. A refrigerator with an impedance of (10 + j 10) Ω is connected to line L1 and to neutral, and to line L2 and neutral all the lighting in the house consists of 10 luminaires of 20 W each. In addition, there is a 240 V dryer that consumes 8 kW. Calculate a) current of line L1 and line L2 and neutral b) total power consumed.The table gives data for open circuit and short circuit tests on a 6 pole, 440 V, 50 Hz, 3 phase star connected alternator. The effective ohmic resistance between any two terminals of the armature is 0.3 ohm. Field current (A) 2 4 6 7 8 10 12 14 OC Vltage (V) 156 288 396 440 474 530 568 592 S.C current 11 22 34 40 46 57 69 80 Find the regulation at full load current of 40 A at 0.8 power factor lagging, using emf method and mmf method.whats the voltage drop of two 3 AWG aluminum conductors that supply a 55A 240v single phase load? the motor is located 95ft from the power supply.