Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 20.1, Problem 1R
- a. What branch circuit supplies the counter-mounted cooking unit in this residence?
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- b. What is the rating of this branch circuit? ________________________________
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Electrical Wiring Residential
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- Q2. For the transformer shown in Fig. 1. A. Plot the winding connection for the transformer and justify your answer. (4M) B. If the transformer is adopted in 12 pulse diode rectifier, where two-series connected bridge rectifiers are used to supply a highly inductive load with 100 A. (i) Select a suitable turns ratio for the transformer (ii) Plot the line current of each winding ( secondary + primary) showing the current magnitude at each interval (iii) Use Fourier Page 1 of 3 analysis to obtain the Fourier series of all line currents then calculate the THD of the input current. (8=0° (16M) (Y) = 30° Fig. 1 P. I v Iarrow_forwardQ2. For the transformer shown in Fig.1, A. Find the phase shift between the primary and star-connected secondary. B. If the transformer is adopted in a 12-pulse diode rectifier, where a two-series connected bridge rectifier is connected in series and supplies a highly inductive load (i) Select a suitable turns ratio for the transformer (ii) Plot the line current of each winding (secondary + primary). (iii)Using Fourier analysis to obtain the Fourier series of all line currents, then calculate the THD of the input current. (iv) Draw the output voltage of the first and second rectifiers and give the relation of the total output voltage. N2 B C Fig. 1 N3 aarrow_forwardQ2.A. It is planned to use the transformer shown in Fig. 1, a 12-pulse rectifier. Each secondary is connected to three phase controlled bridge rectifier. The two rectifiers are connected in series to supply a highly inductive load. 1. Based on the phasor relationship between different windings. If suitable turns ratio is selected, is it possible to use this transformer to produce 12 pulse output voltage? Show the reason behind your answer. 2. Assuming this arrangement is possible to be used in 12-pulse rectifier, draw the output voltage of the 1st and 2nd rectifier and give the relation of the total output voltage. 3. Use the Fourier analysis to show the harmonics in all line currents of the transformer. A B in C Fig. 1 b la a 2 b.arrow_forward
- Q4. Give the reasons for the following 1. In AC machines drives, the frequency modulation index should be integer regardless the value of switching frequency. 2. Variable de link voltage is adopted in inverter operating in square wave operation mode 3. Practical values of switch utilization factor is different from theoretical values 4. In three-phase inverter with my is odd and multiple of 3, the even and tripplen harmonics are zero. 5. The PSC-PWM is attractive for the modular multilevel converterarrow_forwardQ6.B. Answer the following questions 1. Does the steady state load current in a half bridge inverter has an average value and what is the adverse effect of the average current component? 2. Can the LPF of single phase bridge inverter based on bipolar PWM be used with single phase bridge inverter based on unipolar PWM? Explainarrow_forwardQ3. Answer the following questions T 1. Compared to the bipolar voltage-switching scheme, the unipolar scheme is "effectively" doubling the switching frequency. Explain the statement's meaning and how this effect can be generated. 2. What are the properties of a good power switch, and what are its basic ratings? 3. What are the objectives of any PWM strategy for three-phase inverters? 4. Why is the current control PWM rectifier in the dq rotating reference frame preferred over the abc reference frame? 5. Define the switch utilization factor. Show how this factor can be calculated for different single-phase inverters for square wave operation mode at the maximum rated output.arrow_forward
- Q1.B. Explain output control by voltage cancellation in a single-phase inverter. What are the advantages over square wave operation?arrow_forwardQ3.B. What is the problem of three-phase HW rectifier and how can be resolved?arrow_forwardQ3-consider the unity feedback system shown below: a.Evaluate general formula of ess? b.Calculate the steady state error of the closed loop system due to R(s) unit step input, D(s)=0]? c.Calculate the steady-state response when D(s) and ramp and R(s)=0?arrow_forward
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