Solve for Vx and give the magnitude of Vx (in Volts). Let the source V= 76 20°V. 10 2 j4 Q ww ll V, -j2.5 2 2V, (Give answer in 2 decimal places. Unit is not required.)
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- Discuss the concept of power quality in a power system and the various issues, such as harmonics and voltage sags, that can affect it.Name the four voltage-current characteristics commonly used today. Select one or more: A. 230 VOLTS/THREE PHASE/60 HERTZ B. 277 VOLTS/SINGLE PHASE/60 HERTZ C. 240/THREE PHASE/50 HERTZ D. 120 VOLTS/SINGLE PHASE/60 HERTZ E. 208 VOLTS/THREE PHASE/60 HERTZ F. 480 VOLTS/THREE PHASE/60 HERTZ G. 230-VOLTS/SINGLE PHASE/60 HERTZThe voltage applied to a circuit having a resistance of 12 ohms is 150 sin 377t volts. Determine: (a) equation of current wave, (b) equation of power wave, (c) frequency of power wave, (d) average power, (e) power when t = 0.002 sec., and (i) the energy delivered to the circuit when t = 0.002 second.
- The line voltage of a wye connected 2400V 600 KVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and KVA rating? A) voltage a) 1385.6V b) 2400V c) 4156.9V d) none of the above B) current a) 83.34A b) 144.34A c) 250A d) none of the above C) KVA a)600 kva b) 1039.23 kva c) 1257 kva d) none of the aboveQ4. 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)?van R-L circuit takes a current of 7amp that lags behind the 231-volt source by 35elec deg. calculate the power factor, power, impedance, resistance, and inductive reactance of the circuit.
- In an apartment with three flats fed from a 400V 60 Hz three-phase network, a 250W device in apartment-1 and a 'kW device in apartment-2 were operating in a time interval as seen in the figure, while no power was consumed in apartment 3. A disconnection has occurred. In this case, approximately how many Volu is the voltage at the ends of the 250W device? a)214V b)230v C) 372V d)0(zero) e) 356VExplain the principles of power quality in electrical systems and the factors affecting it, including harmonics and voltage sags.If all impedances in Figure Q2 are 15+j45 Ω. Calculate the neutral line current.
- Complete the sentence The power factor must be close to ……………. To insure that losses in the transmission lines will be reducedDefine Power Factor in five ways with respect to each of the following: >angle between the voltage and the current >from impedance triangle >from power triangle >from voltage triangle >from current triangleObjective 3 ) -Be able to calculate all forms of ac power in ac circuits with linear transformers and ideal transformers