Practice Exam

E7A05

1. Which of the following circuits continuously alternates between two states without an external clock signal?

• A. T flip-flop
• B. J-K flip-flop
• C. Astable multivibrator
• D. Monostable multivibrator

E9B06

2. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

• A. 45 degrees
• B. 7.5 degrees
• C. 25 degrees
• D. 75 degrees

E4B01

3. Which of the following factors most affects the accuracy of a frequency counter?

• A. Input attenuator accuracy
• B. Decade divider accuracy
• C. Time base accuracy
• D. Temperature coefficient of the logic

E7C03

4. What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?

• A. Greater transformation range
• B. Greater harmonic suppression
• C. Higher efficiency
• D. To eliminate one capacitor

E4A10

5. Which trigger mode is most effective when using an oscilloscope to measure a linear power supply's output ripple?

• A. Line
• B. Level
• C. Edge
• D. Single-shot

E3C04

6. What does the value of Bz (B sub z) represent?

• A. North-south strength of the interplanetary magnetic field
• B. Geomagnetic field stability
• C. Duration of long-delayed echoes
• D. Critical frequency for vertical transmissions

E3B02

7. What is the approximate maximum range for signals using transequatorial propagation?

• A. 2,500 miles
• B. 7,500 miles
• C. 5,000 miles
• D. 1,000 miles

E1F10

8. Who may be the control operator of an auxiliary station?

• A. Only Amateur Extra class operators
• B. Only Technician, General, Advanced, or Amateur Extra class operators
• C. Any licensed amateur operator
• D. Only General, Advanced, or Amateur Extra class operators

E7H07

9. How can an oscillator's microphonic responses be reduced?

• A. Use NP0 capacitors
• B. Mechanically isolate the oscillator circuitry from its enclosure
• C. Reduce noise on the oscillator's power supply
• D. Increase the gain

E2A10

10. What type of satellite appears to stay in one position in the sky?

• A. Geomagnetic
• B. Geostationary
• C. HEO
• D. LEO

E9G06

11. On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

• A. Polar axis
• B. Impedance axis
• C. Prime axis
• D. Reactance axis

E5D01

12. What is the result of conductor skin effect?

• A. Resistance increases as frequency increases because RF current flows closer to the surface
• B. Resistance increases as temperature increases because of the change in thermal coefficient
• C. Resistance decreases as frequency increases because electron mobility increases
• D. Resistance decreases as temperature increases because of the change in thermal coefficient

E9C08

13. What is a folded dipole antenna?

• A. A dipole one-quarter wavelength long
• B. A center-fed dipole with the ends folded down 90 degrees at the midpoint of each side
• C. A dipole configured to provide forward gain
• D. A half-wave dipole with an additional parallel wire connecting its two ends

E7G10

14. What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms?

• A. 0.03
• B. 1
• C. 76
• D. 38

E1E06

15. Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?

• A. Each administering VE
• B. The VEC coordinating the session
• C. The designated monitoring VE
• D. Only the VE session manager

E6F03

16. What is the most common configuration of an optoisolator or optocoupler?

• A. A frequency-modulated helium-neon laser
• B. A lens and a photomultiplier
• C. An LED and a phototransistor
• D. An amplitude-modulated helium-neon laser

E5B09

17. What is the relationship between the AC current through a capacitor and the voltage across a capacitor?

• A. Voltage and current are in phase
• B. Current leads voltage by 90 degrees
• C. Voltage leads current by 90 degrees
• D. Voltage and current are 180 degrees out of phase

E1A01

18. Why is it not legal to transmit a 3 kHz bandwidth USB signal with a carrier frequency of 14.348 MHz?

• A. The upper 1 kHz of the signal is outside the 20-meter band
• B. USB is not used on 20-meter phone
• C. 14.348 MHz is outside the 20-meter band
• D. The lower 1 kHz of the signal is outside the 20-meter band

E5C02

19. How are impedances described in polar coordinates?

• A. By real and imaginary parts
• B. By X and R values
• C. By Y and G values
• D. By magnitude and phase angle

E2E10

20. Which of these digital modes has the narrowest bandwidth?

• A. FT8
• B. PACTOR IV
• C. 170 Hz shift, 45-baud RTTY
• D. MFSK16

E2C07

21. What is the Cabrillo format?

• A. A method of exchanging information during a contest QSO
• B. A standard for submission of electronic contest logs
• C. A digital protocol specifically designed for rapid contest exchanges
• D. The most common set of contest rules

E6A01

22. In what application is gallium arsenide used as a semiconductor material?

• A. In microwave circuits
• B. In very low-frequency RF circuits
• C. In high-current rectifier circuits
• D. In high-power audio circuits

E8B03

23. What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?

• A. 6
• B. 0.6
• C. 3
• D. 0.3

E8C07

24. What is the bandwidth of a 4,800-Hz frequency shift, 9,600-baud ASCII FM transmission?

• A. 15.36 kHz
• B. 4.8 kHz
• C. 5.76 kHz
• D. 9.6 kHz

E6C01

25. What is the function of hysteresis in a comparator?

• A. To increase the sensitivity
• B. To cause the output to continually change states
• C. To allow the comparator to be used with AC input signals
• D. To prevent input noise from causing unstable output signals

E9D09

26. What is the function of a loading coil in an electrically short antenna?

• A. To lower the losses
• B. To lower the Q
• C. To resonate the antenna by cancelling the capacitive reactance
• D. To increase the SWR bandwidth by increasing net reactance

E1C03

27. How long must an operator wait after filing a notification with the Utilities Technology Council (UTC) before operating on the 2200-meter or 630-meter band?

• A. Operators must not operate until approval is received
• B. Operations may commence immediately, and may continue unless interference is reported by the UTC
• C. Operators may operate after 30 days, providing they have not been told that their station is within 1 kilometer of PLC systems using those frequencies
• D. Operators may not operate until a test signal has been transmitted in coordination with the local power company

E5A10

28. What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries, and C is 10 picofarads?

• A. 23.5 kHz
• B. 7.12 MHz
• C. 7.12 kHz
• D. 23.5 MHz

E9H01

29. When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

• A. It should be configured as a four-sided loop
• B. It should be at least one wavelength long
• C. Its overall length must not exceed 1/4 wavelength
• D. It must be mounted more than 1 wavelength above ground

E1B08

30. What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?

• A. The amateur station must cease operation on all frequencies below 30 MHz
• B. The amateur station must cease operation
• C. The amateur station must cease operation on all frequencies above 30 MHz
• D. The amateur station must avoid transmitting during certain hours on frequencies that cause the interference

E6D08

31. Which of the following materials has the highest temperature stability of its magnetic characteristics?

• A. Ferrite
• B. Powdered iron
• C. Brass
• D. Aluminum

E4E14

32. What is the purpose of a single point ground panel?

• A. Remove AC power in case of a short-circuit
• B. Prevent common-mode transients in multi-wire systems
• C. Ensure all lightning protectors activate at the same time
• D. Eliminate air gaps between protected and non-protected circuits

E9A08

33. Which frequency band has the smallest first Fresnel zone?

• A. 5.8 GHz
• B. 2.4 GHz
• C. 3.4 GHz
• D. 900 MHz

E8D07

34. What is a common cause of overmodulation of AFSK signals?

• A. Excessive frequency deviation
• B. Bit errors in the modem
• C. Excessive transmit audio levels
• D. Excessive numbers of retries

E7E11

35. Which type of detector is used for demodulating SSB signals?

• A. Discriminator
• B. Product detector
• C. Phase detector
• D. Phase comparator

E7B03

36. What circuit is required at the output of an RF switching amplifier?

• A. A high-pass filter to compensate for low gain at low frequencies
• B. A filter to remove harmonic content
• C. A matched load resistor to prevent damage by switching transients
• D. A temperature compensating load resistor to improve linearity

E7F08

37. What is the function of decimation?

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

E7D14

38. What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?

• A. Provide a minimum load on the supply
• B. All these choices are correct
• C. Equalize the voltage across each capacitor
• D. Discharge the capacitors when voltage is removed

E9E04

39. What is the purpose of the series capacitor in a gamma match?

• A. To cancel unwanted inductive reactance
• B. To provide a rejection notch that prevents the radiation of harmonics
• C. To provide DC isolation between the feed line and the antenna
• D. To transform the antenna impedance to a higher value

E8A01

40. What technique shows that a square wave is made up of a sine wave and its odd harmonics?

• A. Vector analysis
• B. Differential analysis
• C. Fourier analysis
• D. Numerical analysis

E3A08

41. When a meteor strikes the Earth's atmosphere, a linear ionized region is formed at what region of the ionosphere?

• A. The F1 region
• B. The D region
• C. The E region
• D. The F2 region

E6B10

42. In Figure E6-2, which is the schematic symbol for a Schottky diode?

• A. 1
• B. 2
• C. 6
• D. 3

E4C13

43. What is reciprocal mixing?

• A. In-phase signals cancelling in a mixer resulting in loss of receiver sensitivity
• B. Two out-of-band signals mixing to generate an in-band spurious signal
• C. Local oscillator phase noise mixing with adjacent strong signals to create interference to desired signals
• D. Two digital signals combining from alternate time slots

E6E02

44. Which of the following device packages is a through-hole type?

• A. SOT
• B. BGA
• C. DIP
• D. PLCC

E0A08

45. What does SAR measure?

• A. Signal amplification rating
• B. Signal attenuation ratio
• C. The rate of RF energy reflected from stationary terrain
• D. The rate at which RF energy is absorbed by the body

E9F06

46. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?

• A. 7.0 meters
• B. 10.6 meters
• C. 8.5 meters
• D. 13.3 meters

E4D06

47. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

• A. Desensitization
• B. Cross modulation interference
• C. Reciprocal mixing
• D. Quieting

E2B06

48. What is vestigial sideband modulation?

• A. Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
• B. A type of modulation in which one sideband is inverted
• C. Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation
• D. Amplitude modulation in which one complete sideband and a portion of the other are transmitted

E1D11

49. Which amateur stations are eligible to operate as Earth stations?

• A. Any amateur licensee who has successfully completed the AMSAT space communications course
• B. Only those of General, Advanced or Amateur Extra class operators
• C. Any amateur station, subject to the privileges of the class of operator license held by the control operator
• D. Only those of Amateur Extra class operators

E2D03

50. Which of the following digital modes is designed for EME communications?

• A. MSK144
• B. WSPR
• C. PACTOR III
• D. Q65