Q5. A. Deternsine the average power delivered at eaclh of the three boxed network in the circuit below: 2. 2. s00 2-j14 Z. B. Derive voltage divider rules for three series resistancer 5.
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- A circuit consists of an AC voltage source, a 10-ohm resistor, and a capacitor, all connected in series. The magnitude of the impedance of the capacitor is also 10 ohms. Which of the following is true about the source voltage and the current through the circuit? a. Insufficient information is given. b. The source voltage will lag the current. c. The source voltage will lead the current. d. The source voltage will be in-phase with the current.Q4. The source current in the circuit shown is in Figure 3a) What impedance should be connected across terminals a,b for maximum average powertransfer?b) What is the average power transferred to the impedance in (a)?c) Assume that the load is restricted to pure resistance. What size resistor connected across a,bwill result in the maximum average power transferred?d) What is the average power transferred to the resistor in (c)?v5.7. In Figure P5.7, the voltages at a, b, and c are balanced 30. Transformers are ideal and have the same turns ratio. Find the voltages Va, Vic, and Vea in terms of Vab, Vher and V ca (a) Are they balanced 30? (b) If not, how would you reconnect the transformers to obtain balanced 36? a rele b 6 b' 000 ( Figure P5.7
- Choose the supply voltage for a step down chopper circuit which drives the resistive load 4.80 with average load current 32.4A for a duty cycle of 0.4. O a. 2624.400 O b. 777.600 O c. 48.000 O d. 388.800Q2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).Determine the branch currents Is, Igandl, in ampere. TVⒸ so www 14 Eng al. The current in ampere 11 [Select] b). The current in ampere 12 [Select] 60 www d. The current in ampere 13 [Select] 40
- Q5. A 20 kVA, 2000/200-V, 50-Hz transformer has a high voltage winding resistance of 0.2 2 and a leakage reactance of 0.240. The low voltage winding resistance is 0.05 and the leakage reactance is 0.02 2. Find the equivalent winding resistance, reactance and impedance referred to the (i) high voltage side and (ii) the low-voltage side. (Draw the related equivalent circuits)The temperature of a noninductive heater unit is controlled by a reactor. The heater unit and the reactor are connected in series across a 250 V, 60 Hz source. The voltage across the heater unit is 200 V. The voltage across the reactor is 100 V. The current in the circuit is 10 A. Determine: the power factor of the series circuit. the power factor of the reactor. the impedance of the reactor. the effective resistance of the reactor. the inductive reactance of the reactorOR e) What is BILS? Explain their significance in power system studies.
- A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the sourceGiven the circuit, solve for: a. using superposition to get the thevenin voltage by R6, what is the contribution of the I1? b. if the load of 250 ohms becomes 100 ohms, what will be the value of Va?A resistor and a capacitor are connected in series across a supply of 250 V. When the supply frequency is 50 Hz the current in the circuit is 5 A. When the supply frequency is 60 Hz, the current is 5.8 A. Find the value of the resistance. Ans: ___ ohms