TRANSMISSION LINES - COMMUNICATIONS SHOW THE DERIVATION OF THE FOLLOWING INPUT IMPEDANCES FROM THE GENERAL FORMULA: Zin = Zo Z₁ + Zotanhys Zo[12/1 Zo+Z tanh s A) LOSSLESS LINE: Zin = Zo Zo tinh B) SHORTED LINE: Zin = j Zotanes c) OPEN LINE: Zin = j Zo cotbs Zo 2 D) = 17: Zin ZL E) l = 1/2λ = Zin = ZL
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- A single-phase transmission line consisting of two conductors, the radius of each conductor is 0.4 cm, the distance between the conductors is three and half meters and the height above ground is eight 1-The capacitance in uF/km without effect of ground is 2-The capacitance in pF/km with effect of ground is7- DC Chopper with output voltage of 120V and input voltage of 80V and output power of 240W. Assume lossless chopper. The average inductance current IL is * 2.6 A 3.0A 4.3A 8- taking into account obtained duty cycle from previous task, the needed : capacitor for realizing 1% ripples at frequency of 10kHz is? * ?? 55.56 uF O 13. 34 uF 92.44 uFParagraph Styles The power factor must be close to in the transmission lines will be reduced To insure that losses D(Ctrl) -
- 8. A transmission line has a characteristic impedance of 500 and a resistance of 0.1 02/m. If the line is distortion less, the attenuation constant (in Np/m) is (a) 500 (b) 5 (c) 0.014 (d) 0.002A sinusoidal voltage wave is propagating on a low loss transmission line. The voltage as a function of position appears as shown below. From this plot, the phase constant B= Voltage 25 20 15 10 -10 -15 -20 -25 10 20 30 40 50 60 70 80 90 100 Meters 0.562 0.314 0.625 0.489If the first and the third reflection coefficients of a matched line are 0.2 and 0.01, then the total reflection coefficient if quarter wave transformer is used for impedance matching is: O a. 0.2 O b. 0.21 O c. 0.2+j*0.01 O d. 0.19 O e. 0.2-j*0.01 O f. 0.01
- Find the input impedance (Zin) for a lossless transmission line shown in below: B C A sa/8- - 52/8- He 31/4 te /2- O O Zin Z, = 50 2 100 N Z, = 75 2 %3D ZL = 60 – j 35 n %3DThe VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedanceThe open circuit imepdance of a certain length of a loss-less line is 100 ohm. The short circuit impedance of the same line is also 100 ohm. What wilp be its characteristic impedance ?
- Q3 For lossless T-L shown, find Z, and 2dat diz £= 1001+ t For Son 1230m Zasonb) A 6052 characteristic impedance transmission line is fed by a DC source of 100V with an internal resistance of 4002. The line is 200m long and has a dielectric constant of 2.25. The load impedance is 12002. Calculate: i. The load reflection coefficient. ii. The source reflection coefficient. iii. What is the voltage at the source terminals just before AND just after 2us?Q1/4 Choose the correct answers and fill the blanks for the following questions: 1. Matching of a transmission line with a characteristic impedance (Zo) and a load impedance (ZR) can be obtained when (b) ZR-2Z0 (a) ZR-0.5Zo (c) ZR-Zo (d) ZR-0 2. Standing wave ratio (S) for a short circuit load connected to a transmission line is equal to (a) S=0 (b) S=-1 (c) S=Infinity (d) S-1 3. Any transmission line repeats its impedance, voltage, and current characteristics every (Where n-0, 1, 2, 3....etc.) (b) nλ/3 (a) nλ/2 (c) nλ/5 (d) nλ/6 4. In smith chart, moving in the clockwise direction means moving. a) From load to generator b) From generator to load 5. In Crank diagram, moving in the clockwise direction from the load to the source can be evaluated using the formula a) +j2Bd b)-j3Bx c) -j2Bd d)-j2ßx 6. For a lossless transmission line operating with frequency 300MHz, and it has an inductance L-30mH/unit of length and a capacity C-75 µF/unit of length, the while the phase constant (B) is…