- An eleAical motor īs modelled as 5117j ohm. Then a 300pF capacitor is conneeted în parallel. If the voltage goplied 3 230 V, 50 H2, calculate: a) Total current b) Active power, reactive power, apparent power Power factor of the motor
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- A 100KVA, 220V, a star-connected alternator is loaded at full load and at 60% pf lagging.The effective AC resistance per phase is 0.01411Ω. If the synchronous reactance is 4.5times the effect of the armature leakage reactance wherein the later is 0.046 Ω perphase, find(a) the phase voltage that would be generated at the load if the circuit were operating normally(b) What no-load open-circuit phase voltage must be present in order to circulate full-load current in short-circuit state while maintaining the same speed and field current?(c) What is the terminal phase voltage of the alternator when it is under a shorted load condition? Give an explanation in support of your response using just one sentence. The IA phasor should be used as the reference one.2. Given a biomass fuel cell powerplant which has power capacity of 600 kW, and assume it generates at 83% of full power for 40 hours per week, 50 weeks per year. If the installation of the powerplant costs $10 million, and yearly operating costs are $100k, but it saves $400k per year in waste disposal costs, how many years before the powerplant pays back the installation cost? Use the average industrial electricity rate found at https://www.electricitylocal.com/states/california/oxnard/ (: A single phase motor operating off a 400V, 50Hz supply is developing 10KW with an efficiency of 84% and a power factor (p.f) of 0.7 lagging. Calculate; The input apparent power; The active and reactive components of the current; The reactive power (in kilovars).
- Q 03: Briefly discuss, how the energy consumptions for operations of a fork lifter could be justified. Suppose that a fork lifter has a total energy consumption of 150 W.Hr. The total trips of the vehicle are 375. How the battery duty cycle may be calculated in this case?Q#4: A single phase motor operating off a 400V, 50Hz supply is developing 10KW with an efficiency of 84% and a power factor (p.f) of 0.7 lagging. Calculate; i) The input apparent power; ii) The active and reactive components of the current; iii) The reactive power (in kilovars).A 230V, 50Hz, single phase motor takes a current of 4A and has a PF of 0.6 lagging. A capacitor in connected in parallel with the motor and takes a current of 3.8A. Calculate the value of new supply current and its power factor. A- Active current component is= B- Reactive current component is C- Reactive current component with capacitor is D- new current= E- new power factor =
- Your company is considering the installation of a 2 MW wind turbine with a rotor diameter of 90 m in a location with average wind v = 8.5 m/s. The turbine has a cut-in velocity of 5 m/s and a cut-out velocity of 25 m/s. The capacity factor is 0.45. The installed cost of the turbine is $3,500,000. Operating expenses are $225,000 per year. The system has a power coefficient (electric power generated divided by wind power) of 0.45. What price would you have to get for the electricity you produce to obtain a 10% return on the plant investment assuming a project lifetime of 20 years? Use the tables for the cumulative wind power distribution in the notes on wind probability to answer this question. Assume an air density of 1.225 kg/m3.Electromechanical energy conversion (One AC induction motor and one AC synchronous motor were operated connected to an infinite bus of 600V. Power factor of the induction motor is 0,7 (lagging) and consumes 400 W from the bus. Synchronous motor consumes 300 W from the bus. If the power factor of the synchronous motor is 0,9 (lagging) find the line current from the bus, for the total of two motors (IL total 1) of the line that connects the motors with the bus and find the total appearent power (SL total 1) of the motors consumed from the bus. When the induction motor has the same conditions, if the power factor of the synchronous motor is 0,9 (leading) find the line current from the bus, for the total of two motors (IL total 2) of the line that connects the motors with the bus and find the total appearent power (SL total 2) of the motors consumed from the bus.A 120Hp engine. of 380VAC,60Hz, f.p =.0.65(-), n = 69% connects inparallel with an 80Kw industrial oven. more 50kw luminaires, f.p =0.4(-).The company orders the power factor to be corrected to 0.9.a) Deduct what is necessary for this purpose.b) attach a D.F of power, indicate the new total power
- A 4400V, 3-ph, Y- connected synchronous motor has an effective resistance and synchronous reactance of 3Ω and 19Ω per phase respectively. If the open–circuit generated emf is 4800V between lines, calculate The current .........amper *P.F at Maximum mechanical powerTotal Cu losses.........watt *Input power to motorAn electrical load of 250Kva has a pf of 0.65 inductive. Connects to the same network a 75kW star synchronous motor, with 88% efficiency, to raise the pf of the installation at 0.85 inductive.a) Calculate the apparent pf of the synchronous motor and the pf at which it will work.b) If the supply voltage is 380V, and the motor has a synchronous impedanceof j0.5 ohms per phase determine the induced emf of the machine.A 550-V feeder line supplies an industrial plant consisting of a motor drawing 60 kW at 0.75 pf (inductive), a capacitor with a rating of 20 kVAR, and lighting drawing 10 kW. (a) Calculate the total reactive power and apparent power absorbed by the plant. (b) Determine the overall pf. (c) Find the current in the feeder line.