Download Calculation of Power-Electrical Circuital Analysis-Assignment and more Exercises Electronic Circuits Analysis in PDF only on Docsity! Assignment No.3 Qno.1 a. Find the average power, the reactive power and the apparent power supplied by the voltage source in the circuit if Vg = 40 cos 106t V. b. Check your answer in (a) by showing P(delivered) = P(absorbed). c. Check your answer in (a) by showing Q(deliverd) = Q(absorbed) Ans. 6.4Watts 4.8Vars 8VA, Qno.2 The two loads shown in Fig can be described as follows: Load 1 absorbs an average power of 60KW and delivers 70KVAR magnetizing reactive power; load 2 has an impedance of 24+7j. The voltage VL is 2500sqrt(2)cos(120 a. Find the rms value of the source voltage. b. By how many microseconds is the load voltage out of phase with the source voltage c. Does the load voltage lead or lag the source voltage docsity.com Ans. 2514.86<2.735, 126.62uS, VL lags VG Qno.3 a. Find the average power dissipated in the line b. Find the capacitive reactance that when connencted in parallel with the load will make the load look purely resistive. c. What is the equivalent impedance of the load d. Find the average power dissipated in the line when the capacitive reactance is connected across the load. e. Express power loss in (d) as a percentage of the power loss found in (a) Ans. 36W, -250, 187.5, 23.58watts, 65.5% Question No.4 The three loads shown in the figure are S1 = 4 +1 j KVA, S2 = 5 + 2j KVA and S3 = 10 +0j KVA a. Calculate the complex power associated with each voltage source, Vg1 and Vg2. b. Verify that the total real and reactive power delivered by the sources equals the total real and reactive power absorbed by the network. Ans. Sg1 = 9166.4 + j1076.8 VA, Sg2 = 10448 + j1923.2 VA. P(dissipated) = P(supplied) = 19614.4Watts , Q(dissipated) = Q(supplied) = 3000VAR. Question No.5 The load impedance ZL is adjusted until maximum average power is delivered to ZL. a. Find the maximum average power delivered to load. b. What percentage of the total power developed in the circuit is delivered to ZL. Question No.6 The peak amplitude of the sinusoidal source Vg is 180V and its frequency is 5000 rad/sec. The load resistor can be varied from 0 to 4000. And the load capacitor can vary from 0.1uF to 0.5uF. a. Calculate the average power delivered to te load when Ro =2000 and Co = 0.2uF. b. Determine the settings of Ro and Co that will result in the most average power being transferred to Ro. c. What is the most average power in (b) ? Is it greater than the power in (a)? d. If there are no constraints on Ro and Co , what is the maximum average power that can be delivered to a load? e. What are the values of Ro and Co for the condition of (d)? f. Is the average power calculated in (d) larger than that calculated in (c)? Ans. 360mW, Co = 0.1uF Ro = 4000, 443.1mW yes, 450mW, 4000 66.6nF, yes Question No.7 A factory has an electrical load of 1600 kW at a lagging power factor of 0.8. An additional docsity.com
