Practice Exam

E6C01

1. What is the recommended power supply voltage for TTL series integratedcircuits?

• A. 12 volts
• B. 5 volts
• C. 1.5 volts
• D. 13.6 volts

E0A09

2. Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?

• A. Uranium Hexaflouride
• B. Beryllium Oxide
• C. Mica
• D. Zinc oxide

E1F01

3. On what frequencies are spread spectrum transmissions permitted?

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

E2C02

4. Which of the following best describes "self spotting" in regards to contest operating?

• A. A manual technique for rapidly zero beating or tuning to a station's frequency before calling that station
• B. The generally prohibited practice of posting one's own call sign and frequency on a call sign spotting network
• C. The acceptable practice of manually posting the call signs of stations on a call sign spotting network
• D. An automatic method for rapidly zero beating or tuning to a station's frequency before calling that station

E1D06

5. Which of the following special provisions must a space station incorporate in order to comply with space station requirements?

• A. The space station must be capable of effecting a cessation of transmissions by telecommand when so ordered by the FCC
• B. The space station must be capable of changing its orbit whenever such a change is ordered by NASA
• C. The station call sign must appear on all sides of the spacecraft
• D. The space station must cease all transmissions after 5 years

E3A06

6. What transmit and receive time sequencing is normally used on 432 MHz when attempting an EME contact?

• A. Five-minute sequences, where one station transmits for five minutes and then receives for the following five minutes
• B. One-minute sequences, where one station transmits for one minute and then receives for the following one minute
• C. Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes
• D. Two-and-one-half minute sequences, where one station transmits for a full 2.5 minutes and then receives for the following 2.5 minutes

E9A15

7. How much gain does an antenna have over a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?

• A. 6.17 dB
• B. 12.5 dB
• C. 14.15 dB
• D. 9.85 dB

E4E02

8. Which of the following types of receiver noise can often be reduced with a DSP noise filter?

• A. Ignition noise
• B. Broadband "white" noise
• C. Power line noise
• D. All of these choices are correct

E8B01

9. What is the term for the ratio between the frequency deviation of an RF carrier wave, and the modulating frequency of its corresponding FM-phone signal?

• A. Modulation index
• B. FM compressibility
• C. Percentage of modulation
• D. Quieting index

E7H16

10. What is a phase-locked loop circuit?

• A. An electronic circuit also known as a monostable multivibrator
• B. An electronic servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator
• C. An electronic circuit consisting of a precision push-pull amplifier with a differential input
• D. An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator

E7B20

11. Which of the following devices is generally best suited for UHF or microwave power amplifier applications?

• A. Triac
• B. Silicon Controlled Rectifier
• C. FET
• D. Nuvistor

E6A05

12. What is the alpha of a bipolar junction transistor?

• A. The change of base current with respect to collector current
• B. The change of collector current with respect to base current
• C. The change of collector current with respect to gate current
• D. The change of collector current with respect to emitter current

E2A08

13. What is the primary reason for satellite users to limit their transmit ERP?

• A. To avoid limiting the signal of the other users
• B. For RF exposure safety
• C. To avoid interfering with terrestrial QSOs
• D. Because the satellite transmitter output power is limited

E4B06

14. If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

• A. 146.52 kHz
• B. 146.52 Hz
• C. 10 Hz
• D. 1465.20 Hz

E5C15

15. In polar coordinates, what is the impedance of a circuit of 100 -j100 ohms impedance?

• A. 141 ohms at an angle of 45 degrees
• B. 100 ohms at an angle of 45 degrees
• C. 100 ohms at an angle of -45 degrees
• D. 141 ohms at an angle of -45 degrees

E5D01

16. What is the result of skin effect?

• A. Thermal effects on the surface of the conductor increase the impedance
• B. As frequency decreases, RF current flows in a thinner layer of theconductor, closer to the surface
• C. As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
• D. Thermal effects on the surface of the conductor decrease the impedance

E7C03

17. What advantage does a Pi-L-network have over a Pi-network for impedance matching between the final amplifier of a vacuum-tube type transmitter and an antenna?

• A. Higher efficiency
• B. Greater transformation range
• C. Greater harmonic suppression
• D. Lower losses

E9E08

18. Which of the following measurements describes a mismatched transmission line?

• A. A dielectric constant greater than 1
• B. An SWR less than 1:1
• C. An SWR greater than 1:1
• D. A reflection coefficient greater than 1

E5B04

19. What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in parallel?

• A. 55 seconds
• B. 220 seconds
• C. 440 seconds
• D. 110 seconds

E4A09

20. Which of the following is most important when adjusting PSK31 transmitting levels?

• A. Power output
• B. SWR
• C. ALC level
• D. PA current

E9C07

21. What is the effect of a terminating resistor on a rhombic antenna?

• A. It reflects the standing waves on the antenna elements back to the transmitter
• B. It changes the radiation pattern from bidirectional to unidirectional
• C. It decreases the ground loss
• D. It changes the radiation pattern from horizontal to vertical polarization

E6B11

22. In Figure E6-3, what is the schematic symbol for a light-emitting diode?

• A. 1
• B. 6
• C. 7
• D. 5

E3B01

23. What is transequatorial propagation?

• A. Propagation between two stations at the same latitude
• B. Propagation between any two points located on the magnetic equator
• C. Propagation between two points at approximately the same distance north and south of the magnetic equator
• D. Propagation between two continents by way of ducts along the magnetic equator

E7F03

24. What is the function of a decade counter digital IC?

• A. It produces ten output pulses for every input pulse
• B. It produces one output pulse for every ten input pulses
• C. It adds two decimal numbers together
• D. It decodes a decimal number for display on a seven-segment LED display

E8C12

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

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

E1B11

26. What frequencies are normally authorized to an amateur station participating in RACES?

• A. Military Affiliate Radio System (MARS) channels
• B. All amateur service frequencies otherwise authorized to the control operator
• C. Specific segments in the amateur service MF, HF, VHF and UHF bands
• D. Specific local government channels

E8A11

27. What is one use for a pulse modulated signal?

• A. Linear amplification
• B. Multiphase power transmission
• C. Digital data transmission
• D. PSK31 data transmission

E6D04

28. Exceeding what design rating can cause a cathode ray tube (CRT) to generate X-rays?

• A. The anode voltage
• B. The operating frequency
• C. The operating temperature
• D. The heater voltage

E7G10

29. How does the gain of a theoretically ideal operational amplifier vary with frequency?

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

E6F15

30. What absorbs the energy from light falling on a photovoltaic cell?

• A. Electrons
• B. Protons
• C. Photons
• D. Holes

E1E20

31. What is the minimum age to be a volunteer examiner?

• A. 21 years old
• B. 18 years old
• C. 16 years old
• D. 13 years old

E7D14

32. What is one purpose of a "bleeder" resistor in a conventional (unregulated) power supply?

• A. To improve output voltage regulation
• B. To cut down on waste heat generated by the power supply
• C. To boost the amount of output current
• D. To balance the low-voltage filament windings

E4D09

33. What is the purpose of the preselector in a communications receiver?

• A. To provide a range of AGC time constants
• B. To allow selection of the optimum RF amplifier device
• C. To store often-used frequencies
• D. To improve rejection of unwanted signals

E3C04

34. Which emission mode is best for auroral propagation?

• A. SSB
• B. CW
• C. FM
• D. RTTY

E2E02

35. What do the letters FEC mean as they relate to digital operation?

• A. Final Error Correction
• B. Forward Error Correction
• C. Fatal Error Correction
• D. First Error Correction

E2B07

36. What is the name of the video signal component that carries color information?

• A. Hue
• B. Chroma
• C. Spectral Intensity
• D. Luminance

E2D04

37. What is the purpose of digital store-and-forward functions on an Amateur satellite?

• A. To delay download of telemetry until the satellite is over the control station
• B. To store digital messages in the satellite for later download by other stations
• C. To upload operational software for the transponder
• D. To relay messages between satellites

E9D02

38. What is one way to produce circular polarization when using linearly polarized antennas?

• A. Stack two Yagis, fed 90 degrees out of phase, to form an array with the respective elements in parallel planes
• B. Arrange two Yagis perpendicular to each other with the driven elements at the same point on the boom and fed 90 degrees out of phase
• C. Stack two Yagis, fed in phase, to form an array with the respective elements in parallel planes
• D. Arrange two Yagis collinear to each other, with the driven elements fed 180 degrees out of phase

E9F04

39. What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

• A. 2.70
• B. 0.30
• C. 0.10
• D. 0.66

E7A02

40. How many output level changes are obtained for every two trigger pulses applied to the input of a "T" flip-flop circuit?

• A. Four
• B. None
• C. One
• D. Two

E6E02

41. Which of these filter bandwidths would be a good choice for use with standard double- sideband AM transmissions?

• A. 500 Hz at -6 dB
• B. 1 kHz at -6 dB
• C. 6 kHz at -6 dB
• D. 15 kHz at -6 dB

E9B06

42. What usually occurs if a Yagi antenna is designed solely for maximum forward gain?

• A. The front-to-back ratio increases
• B. The frequency response is widened over the whole frequency band
• C. The front-to-back ratio decreases
• D. The SWR is reduced

E8D10

43. What is the polarization of an electromagnetic wave if its magnetic field is parallel to the surface of the Earth?

• A. Vertical
• B. Elliptical
• C. Circular
• D. Horizontal

E9H10

44. How can the output voltage of a receiving loop antenna be increased?

• A. By reducing either the number of wire turns in the loop or the area of the loop structure
• B. By increasing the number of wire turns in the loop and reducing the area of the loop structure
• C. By increasing either the number of wire turns in the loop or the area of the loop structure
• D. By reducing the permeability of the loop shield

E1C04

45. When may an automatically controlled station retransmit third party communications?

• A. Never
• B. When specifically agreed upon by the sending and receiving stations
• C. Only when transmitting RTTY or data emissions
• D. When approved by the National Telecommunication and Information Administration

E7E07

46. What is one result of the process of mixing two signals?

• A. The elimination of noise in a wideband receiver by phase differentiation
• B. The elimination of noise in a wideband receiver by phase comparison
• C. The recovery of the intelligence from a modulated RF signal
• D. The creation of new signals at the sum and difference frequencies

E5A09

47. What is the phase relationship between the current through and the voltage across a parallel resonant circuit?

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

E4C14

48. Which of these choices is a desirable amount of selectivity for an amateur VHF FM receiver?

• A. 2.4 kHz
• B. 1 kHz
• C. 4.2 kHz
• D. 15 kHz

E9G01

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

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

E1A03

50. With your transceiver displaying the carrier frequency of phone signals, you hear a DX station's CQ on 14.349 MHz USB. Is it legal to return the call using upper sideband on the same frequency?

• A. No, USA stations are not permitted to use phone emissions above 14.340 MHz
• B. No, my sidebands will extend beyond the band edge
• C. Yes, because the DX station initiated the contact
• D. Yes, because the displayed frequency is within the 20 meter band