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Transmission Fundamentals 2 Transmission Fundamentals 1. What is the opposition to the transfer of energy which is considered the dominant characteristic of a cable or circuit that emanates from its physical structure? • a. Conductance • b. Resistance • c. Reactance • d. Impedance 2. When load impedance equals to Zo of the line, it means that the load _____ all the power. • a. reflects • b. absorbs • c. attenuates • d. radiates 3. impedance matching ratio of a coax balun. • a. 1:4 • b. 4:1 • c. 2:1 • d. 3:2 4. Which stands for dB relative level? • a. dBrn • b. dBa • c. dBr • d. dBx 5. Standard test tone used for audio measurement. • a. 800 Hz • b. 300 Hz • c. 100 Hz • d. 1000 Hz 6. When VSWR is equal to zero, this means • a. that no power is applied • b. that the load is purely resistive • c. that the load is a pure reactance • d. that the load is opened 7. _______ is the ratio of reflected voltage to the forward travelling voltage. • a. SWR • b. VSWR • c. Reflection coefficient • d. ISWR 8. Transmission line must be matched to the load to ______. • a. transfer maximum voltage to the load • b. transfer maximum power to the load • c. reduce the load current • d. transfer maximum current to the load 9. Which indicate the relative energy loss in a capacitor? • a. Quality factor • b. Reactive factor • c. Dissipation factor • d. Power factor 10. What is the standard test tone? • a. 0 dB • b. 0 dBW • c. 0 dBm • d. 0 dBrn 11. The energy that neither radiated into space nor completely transmitted. • a. Reflected waves • b. Captured waves • c. Incident waves • d. Standing waves 12. Micron is equal to _______ meter. • a. 10-10 • b. 10-9 • c. 10-6 • d. 10-3 13. 1 Angstrom (A) is equal to _______. • a. 10-3 micron • b. 10-10 m • c. 10-6 micron • d. 10-6 m 14. Why is it impossible to use a waveguide at low radio frequencies? • a. Because of the size of the waveguide • b. Due to severe attenuation • c. Due to too much radiation • d. All of these 15. ________ is the transmission and reception of information. • a. Modulation • b. Communications • c. Radiation • d. Emission 16. What is the loss of the circuit in dB if the power ration of output to input is 0.01? • a. 20 • b. -20 • c. 40 • d. -40 17. Transmission lines are either balanced or unbalanced with respect to • a. Negative terminal • b. Reference • c. Ground • d. Positive terminal 18. The standing wave ratio is equal to _______ if the load is properly matched with the transmission line. • a. Infinity • b. 0 • c. -1 • d. 1 19. ________ is the advantage of the balanced transmission line compared to unbalanced line. • a. Low attenuation • b. Easy installation • c. Low radiation loss • d. Tensile strength 20. _______ is the method of determining the bandwidth of any processing system. • a. Fourier series • b. Spectral analysis • c. Frequency analysis • d. Bandwidth analysis 21. What causes the attenuation present in a waveguide? • a. The air dielectric filling the guide • b. The coating of silver inside • c. Losses in the conducting walls of the guide • d. Radiation loss 22. A device that converts a balanced line to an unbalanced line of a transmission line. • a. Hybrid • b. Stub • c. Directional coupler • d. Balun 23. What is the approximate line impedance of a parallel-strip line spaced 1 cm apart with the length of 50 cm? • a. 10 ohms • b. 15 ohms • c. 18 ohms • d. 23 ohms 24. What is the average power rating of RG-58 C/u? • a. 25 W • b. 50 W • c. 75 W • d. 200 W 25. A coaxial cable used for high temperatures. • a. RG-58C • b. RG-11A • c. RG-213 • d. RG-211 26. If you have available number of power amplifiers with a gain of 100 each, how many such amplifiers do you need to cascade to give an overall gain of 60dB? • a. 2 • b. 3 • c. 4 • d. 5 27. You are measuring noise in a voice channel at a -4 dB test point level, the meter reads -73 dBm, convert the reading into dBrnCO. • a. 12 • b. 16 • c. 18 • d. 21 28. The velocity factor for a transmission line • a. depends on the dielectric constant of the material used • b. increases the velocity along the transmission line • c. is governed by the skin effect • d. is higher for a solid dielectric than for air 29. Impedance inversion can be obtained by • a. a short-circuited stub • b. an open-circuited stub • c. a quarter-wave line • d. a half-wave line 30. Transmission lines when connected to antennas have • a. capacitive load • b. resistive load whose resistance is greater than the characteristic impedance of the line • c. resistive load whose resistance is less than the characteristic impedance of the line • d. resistive load at the resonant frequency 31. One of the following is not a bounded media. • a. Coaxial line • b. Two-wire line • c. Waveguide • d. Ocean 32. The impedance measured at the input of the transmission line when its length is infinite. • a. Input impedance • b. Open circuit impedance • c. Characteristic impedance • d. Short circuit impedance 33. The following are considered primary line constants except • a. conductance • b. resistance • c. capacitance • d. complex propagation constant 34. The dielectric constants of materials commonly used in transmission lines range from about • a. 1.2 to 2.8 • b. 2.8 to 3.5 • c. 3.5 to 5.2 • d. 1.0 to 1.2 35. Typically, the velocity factor (VF) of the materials used in transmission lines range from • a. 0.6 to 0.9 • b. 0.1 to 0.5 • c. 1.0 to 0.9 • d. 0.6 to 0.8 36. For an air dielectric two-wire line, the minimum characteristic impedance value is • a. 85 ohms • b. 85 ohms • c. 90 ohms • d. 88 ohms 37. When a quarter-wave section transmission line is terminated by a short circuit and is connected to an RF source at the other end, its input impedance is • a. inductive • b. capacitive • c. resistive • d. equivalent to a parallel resonant LC circuit 38. A transmitter operating at 30 MHz with 4 W output is connected via 10 m of RG-8A/u cable to an antenna that has an input resistance of 300 ohms. Find the reflection coefficient. • a. 0.71 • b. 0.77 • c. 0.97 • d. 0.76 39. A quarter wave transformer is connected to a parallel wire line in order to match the line to a load of 1000 ohms. The transformer has a characteristic impedance of 316.23 ohms. The distance between centers is 4 inches. What is the percentage reduction in the diameter of the line? • a. 85% • b. 83% • c. 86% • d. 90% 40. The concept used to make one Smith chart universal is called • a. ionization • b. normalization • c. rationalization • d. termination 41. What are the basic elements of communications system? • a. Source, transmission channel, transmitter • b. Transmitter, receiver, transmission channel • c. Information, transmission channel, receiver • d. Sender and receiver 42. ________ is the transmission of printed material over telephone lines. • a. Internet • b. Data communication • c. Telegraphy • d. Facsimile 43. ________ is a continuous tone generated by the combination of two frequencies of 350 Hz and 440 Hz used in telephone sets. • a. DC tone • b. Ringing tone • c. Dial tone • d. Call waiting tone 44. ________ are unidirectional amplifiers having 20-25 decibel gain that are placed about 75 km apart used to compensate for losses along the telephone line. • a. VF repeaters • b. Loading coils • c. Loop extenders • d. Echo suppressors 45. ________ is a component in the telephone set that has the primary function of interfacing the handset to the local loop. • a. Resistor • b. Capacitor • c. Varistor • d. Induction coil 46. Pulse dialing has ________ rate. • a. 20 pulses/min • b. 10 pulses/min • c. 10 pulses/sec • d. 80 pulses/sec 47. ________ is a telephone wire that connects two central offices. • a. 2-wire circuit • b. Trunk line • c. Leased line.
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