Practice Exam

E4D11

1. Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?

• A. Odd-order products are more likely to overload the IF filters
• B. Odd-order products of two signals in the band being received are also likely to be within the band
• C. Odd-order products are an indication of poor image rejection
• D. Odd-order intermodulation produces three products for every input signal within the band of interest

E9B02

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

• A. 14 dB
• B. 36 dB
• C. 18 dB
• D. 24 dB

E8C12

3. What factors affect the bandwidth of a transmitted CW signal?

• A. IF bandwidth and Q
• B. All these choices are correct
• C. Modulation index and output power
• D. Keying speed and shape factor (rise and fall time)

E1F01

4. On what frequencies are spread spectrum transmissions permitted?

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

E9G04

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

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

E7C11

6. Which of the following measures a filter's ability to reject signals in adjacent channels?

• A. Shape factor
• B. Noise factor
• C. Phase response
• D. Passband ripple

E6D06

7. What core material property determines the inductance of an inductor?

• A. Reactivity
• B. Permittivity
• C. Permeability
• D. Resistance

E3C09

8. What type of data is reported by amateur radio propagation reporting networks?

• A. Solar flux
• B. Electric field intensity
• C. Magnetic declination
• D. Digital-mode and CW signals

E3B05

9. Which of the following paths is most likely to support long-distance propagation on 160 meters?

• A. A path entirely in sunlight
• B. A direct north-south path
• C. Paths at high latitudes
• D. A path entirely in darkness

E5B08

10. 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. 63 degrees with the voltage lagging the current
• C. 27 degrees with the voltage leading the current
• D. 27 degrees with the voltage lagging the current

E6C10

11. In Figure E6-3, which is the schematic symbol for a NOR gate?

• A. 3
• B. 4
• C. 1
• D. 2

E5D01

12. What is the result of conductor skin effect?

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

E6B04

13. What type of semiconductor device is designed for use as a voltage-controlled capacitor?

• A. Silicon-controlled rectifier
• B. Varactor diode
• C. Tunnel diode
• D. Zener diode

E9A09

14. What is antenna efficiency?

• A. Radiation resistance divided by transmission resistance
• B. Radiation resistance divided by total resistance
• C. Effective radiated power divided by transmitter output
• D. Total resistance divided by radiation resistance

E7D06

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

• A. It provides negative feedback to improve regulation
• B. It provides a constant load for the voltage source
• C. It provides regulation by switching or "chopping" the input DC voltage
• D. It controls the current to keep the output voltage constant

E1E03

16. What is a Volunteer Examiner Coordinator?

• A. The person who has entered into an agreement with the FCC to be the VE session manager
• B. A person who has volunteered to administer amateur operator license examinations
• C. An organization that has entered into an agreement with the FCC to coordinate, prepare, and administer amateur operator license examinations
• D. An organization paid by the volunteer examiner team to publicize and schedule examinations

E2D09

17. What type of modulation is used by JT65?

• A. RTTY
• B. Multitone AFSK
• C. PSK
• D. QAM

E9C13

18. How does the radiation pattern of a horizontally polarized antenna vary with increasing height above ground?

• A. The horizontal beamwidth decreases
• B. The takeoff angle of the lowest elevation lobe increases
• C. The takeoff angle of the lowest elevation lobe decreases
• D. The horizontal beamwidth increases

E2A06

19. What are Keplerian elements?

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

E2E13

20. Which of these digital modes has the highest data throughput under clear communication conditions?

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

E7G08

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

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

E2C11

22. How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?

• A. Send your full call sign once or twice
• B. Send your full call sign and grid square
• C. Send the call sign of the DX station three times, the words "this is," then your call sign three times
• D. Send only the last two letters of your call sign until you make contact

E6F07

23. What is a solid-state relay?

• A. A device that uses semiconductors to implement the functions of an electromechanical relay
• B. A mechanical relay that latches in the on or off state each time it is pulsed
• C. A relay that uses transistors to drive the relay coil
• D. A semiconductor switch that uses a monostable multivibrator circuit

E1D03

24. What is a space telecommand station?

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

E5C09

25. When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent?

• A. The X axis represents the magnitude, and the Y axis represents the phase angle
• B. The X axis represents the phase angle, and the Y axis represents the magnitude
• C. The X axis represents the reactive component, and the Y axis represents the resistive component
• D. The X axis represents the resistive component, and the Y axis represents the reactive component

E7F11

26. What sets the minimum detectable signal level for a direct-sampling software defined receiver in the absence of atmospheric or thermal noise?

• A. Reference voltage level and sample width in bits
• B. Sample clock phase noise
• C. Data storage transfer rate
• D. Missing codes and jitter

E1B05

27. What is the National Radio Quiet Zone?

• A. An area surrounding the FCC monitoring station in Laurel, Maryland
• B. An area in New Mexico surrounding the White Sands Test Area
• C. An area in Florida surrounding Cape Canaveral
• D. An area surrounding the National Radio Astronomy Observatory

E9F03

28. Why is the electrical length of a coaxial cable longer than its physical length?

• A. Skin effect is less pronounced in the coaxial cable
• B. Skin effect is more pronounced in the coaxial cable
• C. Electromagnetic waves move more slowly in a coaxial cable than in air
• D. Electromagnetic waves move faster in coaxial cable than in air

E1C02

29. Which of the following apply to communications transmitted to amateur stations in foreign countries?

• A. All these choices are correct
• B. Communications must be limited to those incidental to the purpose of the amateur service and remarks of a personal nature
• C. All transmissions must be in English
• D. Third party traffic must be limited to that intended for the exclusive use of government and non-Government Organization (NGOs) involved in emergency relief activities

E8D10

30. What are some of the differences between the Baudot digital code and ASCII?

• A. Baudot uses 5 data bits per character, ASCII uses 7 or 8; Baudot uses 2 characters as letters/figures shift codes, ASCII has no letters/figures shift code
• B. Baudot uses 4 data bits per character, ASCII uses 7 or 8; Baudot uses 1 character as a letters/figures shift code, ASCII has no letters/figures code
• C. Baudot uses 7 data bits per character, ASCII uses 8; Baudot has no letters/figures shift code, ASCII uses 2 letters/figures shift codes
• D. Baudot uses 6 data bits per character, ASCII uses 7 or 8; Baudot has no letters/figures shift code, ASCII uses 2 letters/figures shift codes

E9D01

31. How much does the gain of an ideal parabolic reflector antenna increase when the operating frequency is doubled?

• A. 3 dB
• B. 2 dB
• C. 6 dB
• D. 4 dB

E7E06

32. Why is de-emphasis used in FM communications receivers?

• A. To reduce impulse noise reception
• B. For compatibility with transmitters using phase modulation
• C. For higher efficiency
• D. To remove third-order distortion products

E4A04

33. How is compensation of an oscilloscope probe performed?

• A. A DC voltage standard is displayed, and the probe is adjusted until the displayed voltage is accurate
• B. A square wave is displayed, and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
• C. A frequency standard is displayed, and the probe is adjusted until the deflection time is accurate
• D. A high frequency sine wave is displayed, and the probe is adjusted for maximum amplitude

E9H06

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

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

E6A02

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

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

E0A08

36. What does SAR measure?

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

E7B02

37. What is a Class D amplifier?

• A. An amplifier biased to be relatively free from distortion
• B. An amplifier that uses drift-mode FETs for high efficiency
• C. An amplifier that uses switching technology to achieve high efficiency
• D. A low power amplifier that uses a differential amplifier for improved linearity

E2B01

38. In digital television, what does a coding rate of 3/4 mean?

• A. 1/4 of the time interval is used as a guard interval
• B. Three, four-bit words are used to transmit each pixel
• C. Data compression reduces data rate by 3/4
• D. 25% of the data sent is forward error correction data

E9E06

39. Which of these transmission line impedances would be suitable for constructing a quarter-wave Q-section for matching a 100-ohm feed point impedance to a 50-ohm transmission line?

• A. 75 ohms
• B. 62 ohms
• C. 90 ohms
• D. 50 ohms

E8B01

40. 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

E8A05

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

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

E4B01

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

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

E5A11

43. 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. 157.8 Hz
• B. 23.67 kHz
• C. 47.3 kHz
• D. 315.6 Hz

E3A05

44. How are the component fields of an electromagnetic wave oriented?

• A. They are tangential
• B. They are at right angles
• C. They are parallel
• D. They are 90 degrees out of phase

E6E09

45. Which of the following component package types have the least parasitic effects at frequencies above the HF range?

• A. Axial lead
• B. Surface mount
• C. TO-220
• D. Radial lead

E4E05

46. What is used to suppress radio frequency interference from a line-driven AC motor?

• A. A brute-force AC-line filter in series with the motor's power leads
• B. A high-pass filter in series with the motor's power leads
• C. A bypass choke in parallel with the motor's field winding
• D. A bypass capacitor in series with the motor's field winding

E7A01

47. Which circuit is bistable?

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

E7H05

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

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

E4C06

49. 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

E1A01

50. 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