Originally the voltage is zero over the entire length of

Question

PROBLEMS-

1. Define the voltage reflection coefficient.

2. Originally, the voltage is zero over the entire length of the transmission line. At t = 0 the switch closes. Find the voltage waveforms at A and B.

3. (a) Originally, the voltage is zero over the entire length of the transmission line. At time t = 0 the switch closes. Find the voltage waveforms at A and B.

(b) If the load Z_R is removed such that an open-circuit condition results at point B, what would the new voltage waveforms be at A and B?

4. The following voltage waveform is seen on an oscilloscope connected to the input of a length of faulted RG8A/U line. Determine the fault location (from the sending end) and the fault impedance. Ignore any losses.

5. The following waveforms are observed at an oscilloscope connected to the input of a cable loaded with unknown impedance.

6. The voltage waveform (see Fig. P2-6) is seen on a time-domain reflectometer (R_G = 50 Ω) connected to a shorted section of coaxial cable.

(a) If the dielectric material is Teflon (ε_r = 2.1), determine the length of cable.

(b) Calculate the characteristic impedance of the cable. (Assume no losses.)

7. The voltage waveform (see Fig. P2-7) is seen on a time-domain reflectometer (RG = 50 Ω) connected to an open section of coaxial cable. If the dielectric material is polystyrene (ε_r = 2.5), determine the:

(a) Length of the cable.

(b) Characteristic impedance of the cable. (Assume no losses.)

8. The following voltage waveform is seen on an oscilloscope connected to the input of a length of faulted open-wire line. Determine the fault location (from the sending end) and the fault resistance. The characteristic impedance of the line is 50 Ω.

9. For the configuration shown, find the time t₁ on the oscilloscope display and calculate the value of the resistor Rx.