Practice Exam

Element 4: Extra (Starts July 1)

E5A14

1. What is the resonant frequency of an RLC circuit if R is 22 ohms, L is 50 microhenries and C is 40 picofarads?

E9G05

2. Which of the following is a common use for a Smith chart?

E8D06

3. What is the advantage of including parity bits in ASCII characters?

E6A07

4. Which of the following indicates that a silicon NPN junction transistor is biased on?

E1D10

5. Which amateur stations are eligible to be telecommand stations of space stations (subject to the privileges of the class of operator license held by the control operator of the station)?

E9F04

6. What impedance does a 1/2-wavelength transmission line present to a generator when the line is shorted at the far end?

E5B11

7. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

E1C05

8. When may an automatically controlled station originate third party communications?

E5C06

9. What does the impedance 50-j25 represent?

E0A06

10. Why are there separate electric (E) and magnetic (H) field MPE limits?

E1A08

11. If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

E7A01

12. Which circuit is bistable?

E2C03

13. From which of the following bands is amateur radio contesting generally excluded?

E4E10

14. What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

E8A04

15. What is "dither" with respect to analog-to-digital converters?

E7H02

16. What is a microphonic?

E5D05

17. What is the power factor of an RL circuit having a 30-degree phase angle between the voltage and the current?

E2D05

18. What is one advantage of the JT65 mode?

E7F08

19. What is the function of decimation?

E6E01

20. Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?

E3C12

21. How does the maximum range of ground-wave propagation change when the signal frequency is increased?

E7B02

22. What is a Class D amplifier?

E9D11

23. Which of the following conductors would be best for minimizing losses in a station's RF ground system?

E2B02

24. How many horizontal lines make up a fast-scan (NTSC) television frame?

E6B06

25. Which of the following is a common use of a Schottky diode?

E1F01

26. On what frequencies are spread spectrum transmissions permitted?

E9E09

27. Which of the following is used to shunt-feed a grounded tower at its base?

E9C09

28. Which of the following describes a G5RV antenna?

E7C02

29. Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?

Figure

E7D06

30. What is the purpose of Q1 in the circuit shown in Figure E7-2?

E8C03

31. Why should phase-shifting of a PSK signal be done at the zero crossing of the RF signal?

E3B01

32. What is transequatorial propagation?

E8B01

33. What is the modulation index of an FM signal?

E6D13

34. What is the primary cause of inductor self-resonance?

E9H11

35. What feature of a cardioid pattern antenna makes it useful for direction finding?

E2A12

36. What is the purpose of digital store-and-forward functions on an amateur radio satellite?

E1E01

37. For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?

E4D09

38. What is the purpose of the preselector in a communications receiver?

E4A06

39. What is the effect of aliasing on a digital oscilloscope caused by setting the time base too slow?

E1B12

40. What must the control operator of a repeater operating in the 70 cm band do if a radiolocation system experiences interference from that repeater?

E4C14

41. What transmit frequency might generate an image response signal in a receiver tuned to 14.300 MHz and that uses a 455 kHz IF frequency?

E3A10

42. Which type of atmospheric structure can create a path for microwave propagation?

E7G08

43. How does the gain of an ideal operational amplifier vary with frequency?

E6C09

44. What is a Programmable Logic Device (PLD)?

E2E09

45. Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?

E6F08

46. Why are optoisolators often used in conjunction with solid-state circuits when switching 120 VAC?

E4B02

47. What is the significance of voltmeter sensitivity expressed in ohms per volt?

E9A06

48. What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?

Figure

E9B03

49. In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?

E7E09

50. What occurs when an excessive amount of signal energy reaches a mixer circuit?