Practice Exam

E4D13

1. What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?

• A. -57 dBm
• B. -60 dBm
• C. -54 dBm
• D. -51 dBm

E8D11

2. What is one advantage of using ASCII code for data communications?

• A. It contains fewer information bits per character than any other code
• B. It includes built-in error correction features
• C. It uses one character as a shift code to send numeric and special characters
• D. It is possible to transmit both uppercase and lowercase text

E9E11

3. What is the purpose of using multiple driven elements connected through phasing lines?

• A. To control the antenna's radiation pattern
• B. To allow single-band antennas to operate on other bands
• C. To create a low-angle radiation pattern
• D. To prevent harmonic radiation from the transmitter

E8B06

4. What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 7.5 kHz if the highest modulation frequency is 3.5 kHz?

• A. 47
• B. 0.47
• C. 2.14
• D. 0.214

E6F08

5. Why are optoisolators often used in conjunction with solid-state circuits that control 120 VAC circuits?

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

E2C09

6. What type of equipment is commonly used to implement an amateur radio mesh network?

• A. A 2-meter VHF transceiver with a 1,200-baud modem
• B. A wireless router running custom firmware
• C. A 440 MHz transceiver with a 9,600-baud modem
• D. A computer running EchoLink to provide interface from the radio to the internet

E9D08

7. What happens as the Q of an antenna increases?

• A. SWR bandwidth decreases
• B. SWR bandwidth increases
• C. Gain is reduced
• D. More common-mode current is present on the feed line

E2A09

8. What do the terms "L band" and "S band" specify?

• A. The 2-meter and 70-centimeter bands
• B. Which sideband to use
• C. The 23- and 13-centimeter bands
• D. FM and digital store-and-forward systems

E5B10

9. What is the relationship between the AC current through an inductor and the voltage across an inductor?

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

E2D08

10. What type of packet frame is used to transmit APRS beacon data?

• A. Connect
• B. Unnumbered Information
• C. Acknowledgement
• D. Burst

E7E05

11. What is added to an FM speech channel to boost the higher audio frequencies?

• A. A pre-emphasis network
• B. A heterodyne enhancer
• C. A de-emphasis network
• D. A harmonic enhancer

E4C06

12. How much does increasing a receiver's bandwidth from 50 Hz to 1,000 Hz increase the receiver's noise floor?

• A. 13 dB
• B. 10 dB
• C. 5 dB
• D. 3 dB

E7F13

13. What is the function of taps in a digital signal processing filter?

• A. Provide access for debugging software
• B. Select the point at which baseband signals are generated
• C. Provide incremental signal delays for filter algorithms
• D. To reduce excess signal pressure levels

E8C06

14. What is the bandwidth of an FT8 signal?

• A. 10 Hz
• B. 2.4 kHz
• C. 50 Hz
• D. 600 Hz

E9F09

15. What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is shorted at the far end?

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

E9C02

16. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4- wavelength apart and fed 90 degrees out of phase?

• A. Omni-directional
• B. A figure-eight end-fire along the axis of the array
• C. A figure-eight broadside to the axis of the array
• D. Cardioid

E7D11

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

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

E2B07

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

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

E6A05

19. How does DC input impedance at the gate of a field-effect transistor (FET) compare with that of a bipolar transistor?

• A. They are both low impedance
• B. An FET has lower input impedance
• C. They are both high impedance
• D. An FET has higher input impedance

E8A06

20. What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal?

• A. 1 to 1
• B. 25 to 1
• C. 2.5 to 1
• D. 13 to 1

E3A12

21. What is most likely to result in auroral propagation?

• A. Extreme low-pressure areas in polar regions
• B. Severe geomagnetic storms
• C. Quiet geomagnetic conditions
• D. Meteor showers

E5A11

22. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?

• A. 315.6 Hz
• B. 47.3 kHz
• C. 157.8 Hz
• D. 23.67 kHz

E6E07

23. What type of transmission line is often used for connections to MMICs?

• A. Miniature coax
• B. Circular waveguide
• C. Parallel wire
• D. Microstrip

E7G01

24. What is the typical output impedance of an op-amp?

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

E3C05

25. What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?

• A. Eastward
• B. Southward
• C. Westward
• D. Northward

E5D07

26. What combines to create the self-resonance of a component?

• A. The component's resistance and reactance
• B. The component's inductance and capacitance
• C. The component's nominal and parasitic reactance
• D. The component's electrical length and impedance

E1D03

27. What is a space telecommand station?

• A. An amateur station located on the surface of the Earth for communication with other Earth stations by means of Earth satellites
• B. An amateur station that receives telemetry from a satellite or balloon more than 50 kilometers above the surface of the Earth
• C. An amateur station located in a satellite or a balloon more than 50 kilometers above the surface of the Earth
• D. An amateur station that transmits communications to initiate, modify, or terminate functions of a space station

E9B08

28. What is the far field of an antenna?

• A. The region where radiated field strengths are constant
• B. The region where radiated power dissipates over a specified time period
• C. The region of the ionosphere where radiated power is not refracted
• D. The region where the shape of the radiation pattern no longer varies with distance

E0A07

29. What is meant by "100% tie-off" regarding tower safety?

• A. All tools secured to the climber's harness
• B. At least one lanyard attached to the tower at all times
• C. All loose ropes and guys secured to a fixed structure
• D. All circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties

E4A06

30. What is the effect of aliasing on a digital oscilloscope when displaying a waveform?

• A. The waveform DC offset will be inaccurate
• B. Excessive blanking occurs, which prevents display of the waveform
• C. A false, jittery low-frequency version of the waveform is displayed
• D. Calibration of the vertical scale is no longer valid

E4B08

31. Which of the following can be used to determine the Q of a series-tuned circuit?

• A. The frequency shift
• B. The bandwidth of the circuit's frequency response
• C. The ratio of inductive reactance to capacitive reactance
• D. The resonant frequency of the circuit

E7A08

32. What logical operation does an OR gate perform?

• A. It produces a 1 at its output if any input is 1
• B. It produces a 1 at its output if all inputs are 0
• C. It produces a 0 at its output if all inputs are 1
• D. It produces a 0 at its output if some but not all inputs are 1

E6C01

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

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

E7H08

34. Which of the following components can be used to reduce thermal drift in crystal oscillators?

• A. Toroidal inductors
• B. Non-inductive resistors
• C. Wirewound resistors
• D. NP0 capacitors

E4E13

35. Where should a station AC surge protector be installed?

• A. At an AC outlet
• B. On a ground rod outside the station
• C. At the AC service panel
• D. On the single point ground panel

E2E02

36. Which of the following synchronizes WSJT-X digital mode transmit/receive timing?

• A. Synchronization of computer clocks
• B. Sync-pulse timing
• C. Sync-field transmission
• D. Alignment of frequency shifts

E1C06

37. Which of the following is required in order to operate in accordance with CEPT rules in foreign countries where permitted?

• A. You must append "/CEPT" to your call sign
• B. The US embassy must approve of your operation
• C. You must identify in the official language of the country in which you are operating
• D. You must have a copy of FCC Public Notice DA 16-1048

E1B01

38. Which of the following constitutes a spurious emission?

• A. An emission outside the signal's necessary bandwidth that can be reduced or eliminated without affecting the information transmitted
• B. A signal transmitted to prevent its detection by any station other than the intended recipient
• C. An amateur station transmission made without the proper call sign identification
• D. Any transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level

E5C04

39. What type of Y-axis scale is most often used for graphs of circuit frequency response?

• A. Scatter
• B. Logarithmic
• C. Linear
• D. Random

E6B01

40. What is the most useful characteristic of a Zener diode?

• A. An internal capacitance that varies with the applied voltage
• B. A constant current drop under conditions of varying voltage
• C. A negative resistance region
• D. A constant voltage drop under conditions of varying current

E3B02

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

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

E1A02

42. When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the lowest frequency at which a properly adjusted LSB emission will be totally within the band?

• A. 3 kHz above the lower band edge
• B. 1 kHz above the lower band edge
• C. 300 Hz above the lower band edge
• D. The exact lower band edge

E9G07

43. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

• A. The current axis
• B. The resistance axis
• C. The reactance axis
• D. The voltage axis

E1F03

44. Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

• A. Gain is less than 23 dB when driven by power of 10 watts or less
• B. The amplifier is constructed or modified by an amateur radio operator for use at an amateur station
• C. The equipment dealer assembled it from a kit
• D. It was manufactured and certificated in a country which has a reciprocal certification agreement with the FCC

E7C01

45. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

• A. A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output
• B. Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
• C. Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground
• D. An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output

E1E01

46. 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

E6D10

47. What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

• A. Toroidal cores confine most of the magnetic field within the core material
• B. Toroidal cores make it easier to couple the magnetic energy into other components
• C. Toroidal cores have lower Q characteristics
• D. Toroidal cores exhibit greater hysteresis

E7B01

48. For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct?

• A. Less than 180 degrees
• B. More than 180 degrees but less than 360 degrees
• C. Exactly 180 degrees
• D. The entire cycle

E9A10

49. Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

• A. Shortening the radiating element
• B. All these choices are correct
• C. Installing a ground radial system
• D. Isolating the coax shield from ground

E9H07

50. What is the function of a Beverage antenna's termination resistor?

• A. Absorb signals from the reverse direction
• B. Increase the front-to-side ratio
• C. Eliminate harmonic reception
• D. Decrease SWR bandwidth