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Let a voltage source
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Chapter 2 Solutions
Power System Analysis and Design (MindTap Course List)
- Assume you are working on sinusoidal ac supply voltage which is in the form of 150 sin 220 t. So apply this voltage find out following parameters. Analyze the average value of voltage. Options: A)89.85volt B)90.75volt C)86.45volt D)95.55voltarrow_forwardTwo electric devices A and B are connected in parallel, and the rms current in A is 15 amp. If the current in B lags behind A by π/3 radians and the total line current is 23.4 amp. (rms), determine the current in B.arrow_forwardc) A heater with resistance 10 N is driven by an AC voltage source (120 V). For the circuit shown below, determine the following: 0.50 j5n Vs 120 V/50 Hz j1n Figure Ql i. The total circuit impedance, Zr, in polar form. 11. The supply current, I.. iiI. The phasor diagram indicating the supply voltage, V, and the supply current, 17 iv. Apparent Power, Real Power, Reactive Power and Power Factor. V. The heater output power. 100arrow_forward
- The instantaneous values ofthe voltage across a two element series circum and the current flowing through it are given by V = 100 sin (314t – π/4)V, i = 20sin (314t – 900)A. Find the frequency and the circuit elementsarrow_forwardAn alternating voltage is represented by 'v' = 235 sin (102 t) volts. Find: (i) Time period, (ii) RMS value and (ii) instantaneous value at 23 ms. Time period, T = RMS value, Vrms = Instantaneous value, v =arrow_forward1. Choose an ac source voltage with frequency of 60 Hz.2. Choose a value for the following: resistance of a unit of lamp; inductance of a unit of inductor; capacitance of a unit capacitor; impedance of a unit leading power factor load with a power factor between 0.9 and 0.96.3. Let Z1 = impedance of a single lamp; Z2 = impedance of a single practical inductor; Z3 = impedance of a single capacitor; Z4 = impedance of a leading pf load. Find the ff:arrow_forward
- 1. A motor load consists of a resistance of 6 Ohms in series with an inductance of 12 mH. Assume 120Vac, 60 Hz supply. a. What is the complex impedance of the load? b. What is the ac current through this load? c. What is theta, the angle between voltage and current through this load? d. What is the power factor? e. What capacitance should be added in parallel with this load to correct the power factor to 1? f. What is the current from the supply when the power factor is corrected?arrow_forwardThe expression T I = i²(t)dt VT defines: Select one: 1. RMS value of the current 2. Average value of the current 3. Peak value of the currentarrow_forwardAC electrical circuit is below: (refer picture below) a. Determine the current flowing in the load. b. If it is desired that the system power factor be 0.9. With system frequency = 50 Hz. Determine how large the capacitor is must be installed? Which one is correct? A/B/others answer A. C = 7.7015 mF B. C = 35.243 µF c. Please Draw all the phasor. Please give complete, details, and correct answer. Please do step by step, draw the phasor Please using handwriting (not typing ). THANK YOU, I WILL GIVE MANY THUMBS UP.arrow_forward
- (a) If v = 141.4 cos wt V and i = 11.31 cos(wt – 30°) A, find the followings : The maximum values for both voltage and current. The RMS values for both voltage and current. ii. iii. Voltage and current in polar form if voltage is the reference. State whether the circuit is inductive or capacitive. iv.arrow_forward7. A source of 100 Volts rms is supplying a resistance 80 ohms in parallel with a 200mH inductor. To what angle is the current lag or lead? A. 46.7 deg. lag B. 43.3 deg. lag C. 46.7 deg. lead D. 43.3 deg. Lead 8. Two impedances Zı=2+j4 and Z2=R+j0, are connected in parallel. Determine R so that the pf of the circuit is 0.9 lagging. A. 3.2 ohms B. 4.2 ohms C. 2.4 ohms D. 6.4 ohms 9. The power factor of a load on a 120 volt. 60HZ source is raised from 0.707 to 0.866 lagging by connecting a 53 micro-farad capacitor across the load. What is the true power of the load in watts? C. 862 D. 268 А. 286 В. 682 10. A factory has an average demand of 176 kw at 70% power factor. What is the minimum size of capacitor required to raise the power factor to 95%? C. 122 KVAR D. 157 KVAR A. 165 KVAR B. 82 KVARarrow_forwardAn alternating voltage is given by v-80 sin(345t + 4) volts. Find (i) RMS value (ii) frequency (iii) Phase angle (0) in degrees if the instantaneous value is 20 V at t = 6 ms. (iv) Instantaneous value of voltage for the sin(345t) at 6 ms. (V) Draw the waveform for the equation 80 sin(345t) at least one complete cycle showing important points.arrow_forward
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