Practice Exam

E3C01

1. What is the cause of short-term radio blackouts?

• A. Solar flares
• B. Sunspots on the solar equator
• C. Coronal mass ejections
• D. North-oriented interplanetary magnetic field

E2B07

2. Which types of modulation are used for amateur television DVB-T signals?

• A. AM and OOK
• B. QAM and QPSK
• C. FM and FSK
• D. All these choices are correct

E3A07

3. Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

• A. Mountain ranges
• B. Nimbus clouds
• C. Large bodies of water
• D. Stratocumulus clouds

E8C15

4. What technique do individual nodes use to form a mesh network?

• A. Acting as store-and-forward digipeaters
• B. Custom code plugs for the local trunking systems
• C. Discovery and link establishment protocols
• D. Forward error correction and Viterbi codes

E5B08

5. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 300 ohms, R is 100 ohms, and XL is 100 ohms?

• A. 63 degrees with the voltage leading the current
• B. 27 degrees with the voltage leading the current
• C. 27 degrees with the voltage lagging the current
• D. 63 degrees with the voltage lagging the current

E1B09

6. Which amateur stations may be operated under RACES rules?

• A. Only stations meeting the FCC Part 97 technical standards for operation during an emergency
• B. Only those club stations licensed to Amateur Extra class operators
• C. Any FCC-licensed amateur station except a Technician class
• D. Any FCC-licensed amateur station certified by the responsible civil defense organization for the area served

E8B01

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

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

E1E01

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

E6B07

9. What causes a junction diode to fail from excessive current?

• A. Insufficient forward voltage
• B. Excessive inverse voltage
• C. Charge carrier depletion
• D. Excessive junction temperature

E9C07

10. What is the approximate feed point impedance at the center of a two-wire half-wave folded dipole antenna?

• A. 450 ohms
• B. 72 ohms
• C. 300 ohms
• D. 50 ohms

E0A06

11. Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?

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

E1A07

12. What is the maximum power permitted on the 2200-meter band?

• A. 100 watts PEP (peak envelope power)
• B. 1 watt EIRP (equivalent isotropic radiated power)
• C. 50 watts PEP (peak envelope power)
• D. 5 watts EIRP (equivalent isotropic radiated power)

E7E02

13. What is the function of a reactance modulator?

• A. Produce PM or FM signals by varying a capacitance
• B. Produce AM signals by varying a resistance
• C. Produce PM or FM signals by varying a resistance
• D. Produce AM signals by varying an inductance

E9E08

14. What is a use for a Wilkinson divider?

• A. To feed high-impedance antennas from a low-impedance source
• B. To divide the frequency of the input to a counter to increase its frequency range
• C. To divide power equally between two 50-ohm loads while maintaining 50-ohm input impedance
• D. To divide the operating frequency of a transmitter signal so it can be used on a lower frequency band

E5A13

15. What is an effect of increasing Q in a series resonant circuit?

• A. Fewer components are needed for the same performance
• B. Phase shift can become uncontrolled
• C. Internal voltages increase
• D. Parasitic effects are minimized

E7C06

16. What are the characteristics of an elliptical filter?

• A. Extremely sharp cutoff with one or more notches in the stop band
• B. Gradual passband rolloff with minimal stop-band ripple
• C. Gradual passband rolloff with extreme stop-band ripple
• D. Extremely flat response over its pass band with gradually rounded stop-band corners

E6E11

17. What is a characteristic of DIP packaging used for integrated circuits?

• A. Extremely low stray capacitance (dielectrically isolated package)
• B. Two rows of connecting pins on opposite sides of package (dual in-line package)
• C. Two chips in each package (dual in package)
• D. Extremely high resistance between pins (doubly insulated package)

E1D11

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

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

E6A10

19. In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?

• A. 4
• B. 2
• C. 6
• D. 5

E9H06

20. What indicates the correct value of terminating resistance for a Beverage antenna?

• A. Minimum variation in SWR over the desired frequency range
• B. Minimum low-angle front-to-back ratio at the design frequency
• C. Maximum feed point DC resistance at the center of the desired frequency range
• D. Maximum DC current in the terminating resistor

E7B05

21. What can be done to prevent unwanted oscillations in an RF power amplifier?

• A. Tune both the input and output for maximum power
• B. Install parasitic suppressors and/or neutralize the stage
• C. Tune the stage for minimum loading
• D. Use a phase inverter in the output filter

E2D11

22. How do APRS stations relay data?

• A. By packet ACK/NAK relay
• B. By C4FM repeaters
• C. By packet digipeaters
• D. By DMR repeaters

E6C06

23. Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

• A. Large bypass capacitance is inherent
• B. The input switching threshold is about twice the power supply voltage
• C. Bandwidth is very limited
• D. The input switching threshold is about half the power supply voltage

E8A05

24. What is the benefit of making voltage measurements with a true-RMS calculating meter?

• A. RMS is measured for both sinusoidal and non-sinusoidal signals
• B. An inverse Fourier transform can be used
• C. The signal's RMS noise factor is also calculated
• D. The calculated RMS value can be converted directly into phasor form

E2A06

25. What are Keplerian elements?

• A. Parameters that define the orbit of a satellite
• B. High-emission heater filaments used in magnetron tubes
• C. Encrypting codes used for spread spectrum modulation
• D. Phase reversing elements in a Yagi antenna

E7F09

26. Why is an anti-aliasing filter required in a decimator?

• A. It removes high-frequency signal components that would otherwise be reproduced as lower frequency components
• B. It removes low-frequency signal components to eliminate the need for DC restoration
• C. It peaks the response of the decimator, improving bandwidth
• D. It notches out the sampling frequency to avoid sampling errors

E7H05

27. How is positive feedback supplied in a Pierce oscillator?

• A. Through a neutralizing capacitor
• B. Through a tapped coil
• C. Through a quartz crystal
• D. Through link coupling

E4B07

28. What do the subscripts of S parameters represent?

• A. The port or ports at which measurements are made
• B. The relative time between measurements
• C. Frequency order of the measurements
• D. Relative quality of the data

E7G03

29. What is the typical input impedance of an op-amp?

• A. 10,000 ohms
• B. Very low
• C. 100 ohms
• D. Very high

E1C01

30. What is the maximum bandwidth for a data emission on 60 meters?

• A. 2.8 kHz
• B. 1.5 kHz
• C. 170 Hz
• D. 60 Hz

E6D08

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

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

E9F07

32. How does parallel conductor transmission line compare to coaxial cable with a plastic dielectric?

• A. Lower velocity factor
• B. Lower loss
• C. Smaller reflection coefficient
• D. Higher SWR

E7A09

33. What logical operation is performed by a two-input exclusive NOR gate?

• A. It produces a 0 at its output if one and only one of its inputs is 1
• B. It produces a 0 at its output only if all inputs are 0
• C. It produces a 1 at its output only if all inputs are 1
• D. It produces a 1 at its output if one and only one input is 1

E6F04

34. What is the photovoltaic effect?

• A. The effect that causes a photodiode to emit light when a voltage is applied
• B. The conversion of voltage to current when exposed to light
• C. The effect that causes a phototransistor's beta to decrease when exposed to light
• D. The conversion of light to electrical energy

E5D10

35. As a conductor's diameter increases, what is the effect on its electrical length?

• A. It decreases
• B. It varies randomly
• C. Thickness has no effect on electrical length
• D. It increases

E9G04

36. What are the two families of circles and arcs that make up a Smith chart?

• A. Resistance and reactance
• B. Reactance and voltage
• C. Inductance and capacitance
• D. Voltage and impedance

E4D05

37. What transmitter frequencies would create an intermodulation-product signal in a receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?

• A. 146.34 MHz and 146.61 MHz
• B. 146.10 MHz and 147.30 MHz
• C. 146.88 MHz and 146.34 MHz
• D. 146.30 MHz and 146.90 MHz

E9D03

38. What is the most efficient location for a loading coil on an electrically short whip?

• A. At a voltage maximum
• B. Near the center of the vertical radiator
• C. As low as possible on the vertical radiator
• D. At a voltage null

E8D02

39. What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF carrier?

• A. Direct sequence
• B. Frequency hopping
• C. Phase compandored spread spectrum
• D. Binary phase-shift keying

E9A08

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

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

E5C12

41. Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?

• A. Point 8
• B. Point 3
• C. Point 1
• D. Point 7

E4C01

42. What is an effect of excessive phase noise in an SDR receiver's master clock oscillator?

• A. It can combine with strong signals on nearby frequencies to generate interference
• B. It limits the receiver's ability to receive strong signals
• C. It can affect the receiver's frequency calibration
• D. It decreases the receiver's third-order intercept point

E7D11

43. What is the purpose of an inverter connected to a solar panel output?

• A. Convert the panel's output from DC to AC
• B. Maintain voltage with varying illumination levels
• C. Prevent discharge when panel is not illuminated
• D. Reduce AC ripple on the output

E2C03

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

• A. 70 centimeters
• B. 6 meters
• C. 33 centimeters
• D. 30 meters

E3B07

45. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation?

• A. Faraday rotation becomes stronger
• B. The critical frequency increases
• C. The distance covered by each hop increases
• D. The MUF decreases

E1F02

46. What privileges are authorized in the US to persons holding an amateur service license granted by the government of Canada?

• A. Full privileges of the General class license on the 80-, 40-, 20-, 15-, and 10-meter bands
• B. The operating terms and conditions of the Canadian amateur service license, not to exceed US Amateur Extra class license privileges
• C. None, they must obtain a US license
• D. Full privileges, up to and including those of the Amateur Extra class license, on the 80-, 40-, 20-, 15-, and 10-meter bands

E4E07

47. Which of the following can cause shielded cables to radiate or receive interference?

• A. Common-mode currents on the shield and conductors
• B. Tying all ground connections to a common point resulting in differential-mode currents in the shield
• C. Use of braided shielding material
• D. Low inductance ground connections at both ends of the shield

E9B03

48. What is the front-to-side ratio of the antenna radiation pattern shown in Figure E9-1?

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

E2E06

49. What is the length of an FT8 transmission cycle?

• A. 8 seconds
• B. 30 seconds
• C. 15 seconds
• D. It varies with the amount of data

E4A10

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

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