A starconnected, 5000 V, 3pase altemator is supplying 3,00 kWat power factor of 0.8. Calculate the active and reactive components of the current in each phase. (Ans. 346.2 A; 260 A)
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- 15 A of current is taken by a non-inductive load at 125 V. In order that the same current shall be generated from 240 V, 50 Hz mains. An inductor is now also then connected in series. Note: The resistance of the inductor should be ignored and also assume the waveform to be sinusoidal. Determine the phase difference between the current and the applied voltage, the impedance of the circuit and the inductance of the inductor.The total power drawn by the two-impedance load in parallel is 26kW at 0.98 power factor lagging, it is being supplied by a 230-volts AC source. One of the loads (Load 1) takes 16kVA at 0.77 power factor lagging. What is the reactive power of the unknown impedance (Load 2)?Find the complex power and power factor for the indicated element(s).( need only handwritten solution .otherwise downvote.)
- Two impedances consist of resistance of (15 ohms and series connectedinductance of 0.04 henry) and (resistance of 10 ohms, inductance of 0.1 henryand a capacitance of 100 microfarad, all in series) are connected in series andare connected to 230 volts, 50 – Hz AC source. Find: (a) current drawn, (b) voltageacross each impedance, (c) individual and total power factor. Draw the phasordiagram.Which cannot be said since Z is an inductive load in the circuit given below? A) load voltage period is 0.02sec. B) Load voltage peak value is 311V. C) Load voltage frequency is 50Hz D) Load voltage average value is 220V.A parallel circuit of 25 – ohm resistor, 64 – mH inductor and 80 - μF capacitor connected across a 110 V, 50 Hz, single phase supply is shown in the figure below. Calculate: a.) the current in the individual element, b.) the total current drawn from the supply, c.) overall power factor of the circuit. Draw a neat phasor diagram showing IR, IL and IC.
- 8. The total power supplied to a balance delta load is found in the same way as for a balance wye load. True False Either Neither 12. A load of 20 + j35 ohms is connected across a 220 V, 60 Hz supply. Find the reactive power of the load in var. 595 2420 1042 1382 13. A type of DC source where the characteristic output voltage has perfect unidirectional waveform and is based on electrochemical principle. Generator Inverter Converter Battery 14. Calculate the Rf of a circuit whose impedance is 20+j35 and current of 2A. 0.86 0.91 0.50 0.71 15. What capacitor shall be installed in parallel with a circuit to achieve a unity power factor if the reactive power of a circuit is 200VARS and the voltage is 100V. 80.45 microfarad 53.05 microfarad It's already in unity 62.45 microfaradP2. A 100 volts rms single-phase voltage source feeds an inductive load of (30+j40) 2. Determine the value of capacitance to bring the power factor of the source to unity.Two three-phase alternators operate in parallel and the excitation is such that theinduced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. Theadmittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) Srespectively. The emf of B leads A by 10°e. Calculate:(a) the terminal voltage(b) the current supplied by A(c) the power factor of B
- The circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three-phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and ITThe circuit shows an unbalanced electrical installation powered by a positive sequence symmetrical three- phase network of 380 V compound voltage. The loads are single phase. Load 1 absorbs an active power of 950 W with f.d.p. 0.5 inductive. Load 2 absorbs an active power of 1,140 W with f.d.p. Unit. Load 3 absorbs from the network an active power of 760 W with f.d.p. 0.5 capacitive. Taking the network voltage URN as the phase reference, calculate: a) complex expressions of the line currents IR. Is. and IT RO- SO TO IR Is IT U₁-380 V CARGA 1 P₁ =950 W cos p1=0,5 ind. CARGA 2 P₂=1.140 W cos p₂=1 CARGA 3 P3=760 W cos p3=0,5 cap.An alternating voltage of 110 volts is applied to a circuit with resistance of 8.66 Ohms, inductance of 0.106 Henries, and capacitance of 75.8 microFarads. The frequency of the voltage is 50 Hz. Determine: a. The current in the circuit and its phase angle relative to the applied voltage. b. The voltage drop across each component of the circuit. c. The active and reactive power inputs to the circuit. d. Draw (Not hand-sketch) the equivalent power triangle. e. Is the RLC load of the circuit inductive or capacitive? Why?