Practice Exam

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?

• A. 3.56 MHz
• B. 44.72 MHz
• C. 22.36 MHz
• D. 1.78 MHz

E9G05

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

• A. Determine the impedance of a transmission line, given the physical dimensions
• B. Determine the gain of an antenna given the physical and electrical parameters
• C. Determine the loss/100 feet of a transmission line, given the velocity factor and conductor materials
• D. Determine the length and position of an impedance matching stub

E8D06

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

• A. Faster transmission rate
• B. Foreign language characters can be sent
• C. The signal can overpower interfering signals
• D. Some types of errors can be detected

E6A07

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

• A. Base-to-emitter resistance of approximately 0.6 to 0.7 ohms
• B. Base-to-emitter resistance of approximately 6 to 7 ohms
• C. Base-to-emitter voltage of approximately 6 to 7 volts
• D. Base-to-emitter voltage of approximately 0.6 to 0.7 volts

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)?

• A. Any amateur station so designated by the space station licensee
• B. All these choices are correct
• C. Any amateur station designated by NASA
• D. Any amateur station so designated by the ITU

E9F04

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

• A. The same as the output impedance of the generator
• B. Very high impedance
• C. Very low impedance
• D. The same as the characteristic impedance of the line

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?

• A. 76 degrees with the voltage lagging the current
• B. 14 degrees with the voltage leading the current
• C. 76 degrees with the voltage leading the current
• D. 14 degrees with the voltage lagging the current

E1C05

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

• A. Never
• B. When approved by the National Telecommunication and Information Administration
• C. Only when transmitting RTTY or data emissions
• D. When agreed upon by the sending or receiving station

E5C06

9. What does the impedance 50-j25 represent?

• A. 25 ohms resistance in series with 50 ohms inductive reactance
• B. 50 ohms resistance in series with 25 ohms capacitive reactance
• C. 25 ohms resistance in series with 50 ohms capacitive reactance
• D. 50 ohms resistance in series with 25 ohms inductive reactance

E0A06

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

• A. All these choices are correct
• B. The body reacts to electromagnetic radiation from both the E and H fields
• C. Ground reflections and scattering make the field strength vary with location
• D. E field and H field radiation intensity peaks can occur at different locations

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?

• A. The control operator of the packet bulletin board station
• B. The control operators of all the stations in the system not authenticating the source from which they accept communications
• C. The control operator of the originating station
• D. The control operators of all the stations in the system

E7A01

12. Which circuit is bistable?

• A. An AND gate
• B. An OR gate
• C. A flip-flop
• D. A bipolar amplifier

E2C03

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

• A. 30 meters
• B. 6 meters
• C. 2 meters
• D. 33 centimeters

E4E10

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

• A. All these choices are correct
• B. A malfunctioning illuminated advertising display
• C. Arcing contacts in a thermostatically controlled device
• D. A defective doorbell or doorbell transformer inside a nearby residence

E8A04

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

• A. An abnormal condition where the converter cannot settle on a value to represent the signal
• B. An error caused by irregular quantization step size
• C. A small amount of noise added to the input signal to allow more precise representation of a signal over time
• D. A method of decimation by randomly skipping samples

E7H02

16. What is a microphonic?

• A. Changes in oscillator frequency due to mechanical vibration
• B. Excess loading of the microphone by an oscillator
• C. An IC used for amplifying microphone signals
• D. Distortion caused by RF pickup on the microphone cable

E5D05

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

• A. 1.73
• B. 0.5
• C. 0.866
• D. 0.577

E2D05

18. What is one advantage of the JT65 mode?

• A. Uses only a 65 Hz bandwidth
• B. The ability to decode signals which have a very low signal-to-noise ratio
• C. Easily copied by ear if necessary
• D. Permits fast-scan TV transmissions over narrow bandwidth

E7F08

19. What is the function of decimation?

• A. Removing unnecessary significant digits
• B. Reducing the effective sample rate by removing samples
• C. Converting data to binary code decimal form
• D. Attenuating the signal

E6E01

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

• A. Higher electron mobility
• B. Lower junction voltage drop
• C. Lower transconductance
• D. Higher noise figures

E3C12

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

• A. It peaks at roughly 14 MHz
• B. It stays the same
• C. It increases
• D. It decreases

E7B02

22. What is a Class D amplifier?

• A. An amplifier that uses drift-mode FETs for high efficiency
• B. A low power amplifier that uses a differential amplifier for improved linearity
• C. A frequency doubling amplifier
• D. A type of amplifier that uses switching technology to achieve high efficiency

E9D11

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

• A. Resistive wire, such as spark plug wire
• B. Stranded wire
• C. Wide flat copper strap
• D. Solid wire

E2B02

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

• A. 1080
• B. 60
• C. 30
• D. 525

E6B06

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

• A. As a rectifier in high current power supplies
• B. As a constant voltage reference in a power supply
• C. As a variable capacitance in an automatic frequency control circuit
• D. As a VHF/UHF mixer or detector

E1F01

26. On what frequencies are spread spectrum transmissions permitted?

• A. Only on amateur frequencies above 144 MHz
• B. Only on amateur frequencies above 50 MHz
• C. Only on amateur frequencies above 420 MHz
• D. Only on amateur frequencies above 222 MHz

E9E09

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

• A. Hairpin match
• B. All these choices are correct
• C. Gamma match
• D. Double-bazooka match

E9C09

28. Which of the following describes a G5RV antenna?

• A. A multi-band trap antenna
• B. A multi-band dipole antenna fed with coax and a balun through a selected length of open wire transmission line
• C. A phased array antenna consisting of multiple loops
• D. A wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun

E7C02

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

• A. It is a notch filter
• B. It is a low-pass filter
• C. It is a high-pass filter
• D. It is a band-pass filter

E7D06

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

• A. It provides a constant load for the voltage source
• B. It provides negative feedback to improve regulation
• C. It controls the current supplied to the load
• D. It provides D1 with current

E8C03

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

• A. All these choices are correct
• B. To improve carrier suppression
• C. To minimize bandwidth
• D. To simplify modulation

E3B01

32. What is transequatorial propagation?

• A. Propagation between two mid-latitude points at approximately the same distance north and south of the magnetic equator
• B. Propagation between points at the same latitude
• C. Propagation between a point on the equator and its antipodal point
• D. Propagation between points located on the magnetic equator

E8B01

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

• A. The bandwidth of the transmitted signal divided by the modulating signal frequency
• B. The ratio of modulating signal amplitude to frequency deviation
• C. The ratio of frequency deviation to modulating signal frequency
• D. The type of modulation used by the transmitter

E6D13

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

• A. Non-linear core hysteresis
• B. The skin effect
• C. Inductive kickback
• D. Inter-turn capacitance

E9H11

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

• A. High radiation angle
• B. Broadband response
• C. A very sharp peak
• D. A very sharp single null

E2A12

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

• A. To store digital messages in the satellite for later download by other stations
• B. To delay download of telemetry between satellites
• C. To upload operational software for the transponder
• D. To relay messages between satellites

E1E01

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

• A. Providing amateur operator license examination preparation training materials
• B. Teaching an amateur operator license examination preparation course
• C. Preparing, processing, administering, and coordinating an examination for an amateur radio operator license
• D. No expenses are authorized for reimbursement

E4D09

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

• A. To increase rejection of signals outside the desired band
• B. To provide a range of AGC time constants
• C. To allow selection of the optimum RF amplifier device
• D. To store often-used frequencies

E4A06

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

• A. All signals will have a DC offset
• B. A false, jittery low-frequency version of the signal is displayed
• C. Excessive blanking occurs, which prevents display of the signal
• D. Calibration of the vertical scale is no longer valid

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?

• A. Reduce the repeater antenna HAAT (Height Above Average Terrain)
• B. All these choices are correct
• C. Cease operation or make changes to the repeater to mitigate the interference
• D. File an FAA NOTAM (Notice to Airmen) with the repeater system's ERP, call sign, and six-character grid locator

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?

• A. 14.445 MHz
• B. 13.845 MHz
• C. 15.210 MHz
• D. 14.755 MHz

E3A10

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

• A. Dust devil
• B. The jet stream
• C. Wind shear
• D. Temperature inversion

E7G08

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

• A. It decreases linearly with increasing frequency
• B. It decreases logarithmically with increasing frequency
• C. It does not vary with frequency
• D. It increases linearly with increasing frequency

E6C09

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

• A. A programmable collection of logic gates and circuits in a single integrated circuit
• B. Programmable equipment used for testing digital logic integrated circuits
• C. A logic circuit that can be modified during use
• D. A type of transistor whose gain can be changed by digital logic circuits

E2E09

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

• A. RTTY
• B. PACTOR
• C. PSK31
• D. MT63

E6F08

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

• A. Optoisolators provide a very high degree of electrical isolation between a control circuit and the circuit being switched
• B. Optoisolators provide impedance matching between the control circuit and power circuit
• C. Optoisolators provide a low impedance link between a control circuit and a power circuit
• D. Optoisolators eliminate the effects of reflected light in the control circuit

E4B02

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

• A. The full scale reading of the voltmeter multiplied by its ohms per volt rating will indicate the input impedance of the voltmeter
• B. When used as a galvanometer, the reading in volts multiplied by the ohms per volt rating will determine the power drawn by the device under test
• C. When used as an ohmmeter, the reading in ohms divided by the ohms per volt rating will determine the voltage applied to the circuit
• D. When used as an ammeter, the full scale reading in amps divided by ohms per volt rating will determine the size of shunt needed

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?

• A. 317 watts
• B. 300 watts
• C. 126 watts
• D. 2000 watts

E9B03

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

• A. 18 dB
• B. 14 dB
• C. 24 dB
• D. 12 dB

E7E09

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

• A. A beat frequency is generated
• B. Spurious mixer products are generated
• C. Mixer blanking occurs
• D. Automatic limiting occurs