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Chapter 2 Solutions
Power System Analysis and Design (MindTap Course List)
- 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_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_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_forward
- Please answer both subparts for like either dislike...please botharrow_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_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_forward
- Do iv and v?arrow_forwardFor the circuit shown in the figure, A. If A = 8.0 s and B = 15.2 s, the average value of current is A. B. If A = 3.0 s and B = 17.2 s, the RMS value of the current is A. For the circuit shown in the figure, 4 2 A Barrow_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
- In a Y-connected AC generator, the RMS generated phase voltage is EA=450 Volts at a frequency f=50 Hz. The instantaneous phase-c voltage expression of this generator. Select one: O a. ecc(t) =636.4 sin(314.16t - 120°) Volts O b. ecc(t) =779.4 sin(314.16t - 240°) Volts O c. None O d. ecc(t) =450 sin(314.16t - 240°) Volts O e. ecc(t) =636.4 sin(314.16t + 120°) Volts Clear my choicearrow_forwardFigure 2 shows an AC circuit consists of 2 loads. The information of the loads are given in Table 1. The circuit is supplied by AC voltage source, V,. Answer the following questions. i) Determine Zı and Zz impedances ii) Determine the rms value of Vs Table 1 Load Average power Power Factor Load Zi 24 kW 0.66 leading Load Z2 18 kW 0.82 lagging 0.6 N 1.2 2 j0.4 N V Z1 Vrms = 440/0° Varrow_forwardA 60 Hz sinusoidal voltage v = 141sinwt is applied to a series RL circuit. The values of the resistance and the inductance are 3 ohms and 0.016 henry respectively. a) Compute the rms value of the current and its phase angle with respect to the voltage.b) write the expression of the instantaneous current.arrow_forward
- Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning