Practice Exam

E7H09

1. What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?

• A. A direct digital synthesizer
• B. A diode-switching matrix synthesizer
• C. A phase-locked loop synthesizer
• D. A hybrid synthesizer

E9D04

2. Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

• A. To lower the radiation angle
• B. To swamp out harmonics
• C. To minimize losses
• D. To minimize the Q

E9G01

3. Which of the following can be calculated using a Smith chart?

• A. Impedance along transmission lines
• B. Radio propagation
• C. Radiation resistance
• D. Antenna radiation pattern

E6B03

4. What type of bias is required for an LED to emit light?

• A. Forward bias
• B. Reverse bias
• C. Inductive bias
• D. Zero bias

E6D07

5. What is current in the primary winding of a transformer called if no load is attached to the secondary?

• A. Stabilizing current
• B. Excitation current
• C. Direct current
• D. Magnetizing current

E2D08

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

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

E4A10

7. Which of the following displays multiple digital signal states simultaneously?

• A. Network analyzer
• B. Modulation monitor
• C. Logic analyzer
• D. Bit error rate tester

E1A07

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

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

E6E07

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

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

E5A12

10. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118?

• A. 31.4 kHz
• B. 436.6 kHz
• C. 15.7 kHz
• D. 218.3 kHz

E7F03

11. What type of digital signal processing filter is used to generate an SSB signal?

• A. An adaptive filter
• B. A Hilbert-transform filter
• C. A notch filter
• D. An elliptical filter

E3A11

12. What is a typical range for tropospheric propagation of microwave signals?

• A. 100 miles to 300 miles
• B. 1200 miles
• C. 2500 miles
• D. 10 miles to 50 miles

E1E08

13. To which of the following examinees may a VE not administer an examination?

• A. Relatives of the VE as listed in the FCC rules
• B. Employees of the VE
• C. Friends of the VE
• D. All these choices are correct

E8C02

14. What is the definition of symbol rate in a digital transmission?

• A. The number of control characters in a message packet
• B. The rate at which the waveform changes to convey information
• C. The duration of each bit in a message sent over the air
• D. The number of characters carried per second by the station-to-station link

E4E05

15. How can radio frequency interference from an AC motor be suppressed?

• A. By installing a brute-force AC-line filter in series with the motor leads
• B. By installing a bypass capacitor in series with the motor leads
• C. By using a ground-fault current interrupter in the circuit used to power the motor
• D. By installing a high-pass filter in series with the motor's power leads

E6C03

16. What is tri-state logic?

• A. Logic devices that utilize ternary math
• B. Proprietary logic devices manufactured by Tri-State Devices
• C. Logic devices with 0, 1, and high-impedance output states
• D. Low-power logic devices designed to operate at 3 volts

E9H03

17. What is Receiving Directivity Factor (RDF)?

• A. Relative directivity compared to a dipole
• B. Forward gain compared to average gain over the entire hemisphere
• C. Relative directivity compared to isotropic
• D. Forward gain compared to the gain in the reverse direction

E0A01

18. What is the primary function of an external earth connection or ground rod?

• A. Reduce RFI to telephones and home entertainment systems
• B. Reduce RF current flow between pieces of equipment
• C. Reduce received noise
• D. Lightning protection

E6F04

19. What is the photovoltaic effect?

• A. The conversion of electrical energy to mechanical energy
• B. The conversion of light to electrical energy
• C. The tendency of a battery to discharge when exposed to light
• D. The conversion of voltage to current when exposed to light

E7B01

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

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

E9C03

21. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?

• A. A Figure-8 end-fire along the axis of the array
• B. Cardioid
• C. Omni-directional
• D. A Figure-8 broadside to the axis of the array

E2C05

22. What is the function of a DX QSL Manager?

• A. To run a net to allow many stations to contact a rare DX station
• B. To handle the receiving and sending of confirmation cards for a DX station
• C. To relay calls to and from a DX station
• D. To allocate frequencies for DXpeditions

E7G07

23. What magnitude of voltage gain can be expected from the circuit in Figure E7 3 when R1 is 10 ohms and RF is 470 ohms?

• A. 24
• B. 0.21
• C. 47
• D. 94

E9E04

24. What is the purpose of the series capacitor in a gamma-type antenna matching network?

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

E1B01

25. Which of the following constitutes a spurious emission?

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

E7A01

26. Which circuit is bistable?

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

E9B08

27. What is the far field of an antenna?

• A. The region where radiated power dissipates over a specified time period
• B. The region where radiated field strengths are constant
• C. The region of the ionosphere where radiated power is not refracted
• D. The region where the shape of the antenna pattern is independent of distance

E4B11

28. Which of the following can be measured with a vector network analyzer?

• A. All these choices are correct
• B. Output impedance
• C. Input impedance
• D. Reflection coefficient

E2A05

29. What do the letters in a satellite's mode designator specify?

• A. The location of the ground control station
• B. The polarization of uplink and downlink signals
• C. Power limits for uplink and downlink transmissions
• D. The uplink and downlink frequency ranges

E1F05

30. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

• A. 420 MHz - 430 MHz
• B. 440 MHz - 450 MHz
• C. 222 MHz - 223 MHz
• D. 53 MHz - 54 MHz

E3C04

31. What does the value of Bz (B sub Z) represent?

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

E8D04

32. What is the primary effect of extremely short rise or fall time on a CW signal?

• A. The generation of key clicks
• B. More difficult to copy
• C. Limits data speed
• D. The generation of RF harmonics

E4C03

33. What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?

• A. Capture effect
• B. Cross-modulation interference
• C. Frequency discrimination
• D. Desensitization

E3B01

34. What is transequatorial propagation?

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

E8A05

35. What of the following instruments would be the most accurate for measuring the RMS voltage of a complex waveform?

• A. A true-RMS calculating meter
• B. A D'Arsonval meter
• C. An absorption wave meter
• D. A grid dip meter

E4D04

36. Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?

• A. Utilizing a Class D final amplifier
• B. A band-pass filter in the feed line between the transmitter and receiver
• C. A properly terminated circulator at the output of the repeater's transmitter
• D. Utilizing a Class C final amplifier

E8B11

37. What is digital time division multiplexing?

• A. Two or more data streams are assigned to discrete sub-carriers on an FM transmitter
• B. Two or more signals are quadrature modulated to increase bandwidth efficiency
• C. Two or more signals are arranged to share discrete time slots of a data transmission
• D. Two or more data streams share the same channel by transmitting time of transmission as the sub-carrier

E7C12

38. What is one advantage of a Pi-matching network over an L-matching network consisting of a single inductor and a single capacitor?

• A. Pi-networks are more stable
• B. Pi-networks provide balanced input and output
• C. L-networks cannot perform impedance transformation
• D. The Q of Pi-networks can be controlled

E1C09

39. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

• A. 1.0
• B. 2.0
• C. 3.0
• D. 0.5

E9A01

40. What is an isotropic antenna?

• A. A horizontally polarized antenna used to compare Yagi antennas
• B. A spacecraft antenna used to direct signals toward Earth
• C. A theoretical, omnidirectional antenna used as a reference for antenna gain
• D. A grounded antenna used to measure Earth conductivity

E1D10

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

E5B11

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

E5D10

43. How can the true power be determined in an AC circuit where the voltage and current are out of phase?

• A. By multiplying the apparent power by the power factor
• B. By dividing the reactive power by the power factor
• C. By multiplying the reactive power by the power factor
• D. By dividing the apparent power by the power factor

E7D07

44. What is the purpose of C2 in the circuit shown in Figure E7-2?

• A. It bypasses rectifier output ripple around D1
• B. To provide fixed DC bias for Q1
• C. To self-resonate at the hum frequency
• D. It is a brute force filter for the output

E6A02

45. Which of the following semiconductor materials contains excess free electrons?

• A. Insulated gate
• B. P-type
• C. N-type
• D. Bipolar

E2E10

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

• A. 170 Hz shift, 45-baud RTTY
• B. 300-baud packet
• C. PSK31
• D. MFSK16

E9F01

47. What is the velocity factor of a transmission line?

• A. The velocity of the wave in the transmission line divided by the velocity of light in a vacuum
• B. The ratio of the characteristic impedance of the line to the terminating impedance
• C. The velocity of the wave in the transmission line multiplied by the velocity of light in a vacuum
• D. The index of shielding for coaxial cable

E5C12

48. 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 7
• B. Point 3
• C. Point 1
• D. Point 8

E2B08

49. What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70 cm band?

• A. Transmitting on channels shared with cable TV
• B. Using USB and demodulating the signal with a computer sound card
• C. Transmitting on the abandoned TV channel 2
• D. Using converted satellite TV dishes

E7E10

50. How does a diode envelope detector function?

• A. By sensing the change of reactance in the diode with respect to frequency
• B. By rectification and filtering of RF signals
• C. By breakdown of the Zener voltage
• D. By mixing signals with noise in the transition region of the diode