3D1X3 Volume 2

1. (225) The common name for the method of changing the encryption keys over the radio channel in a two-way radio system is called

Over-the-air-rekeying.

Asymmetric

Symmetric.

Off-line.

2. (228) Concerning HAVE QUICK II communications multiple word-of-day (MWOD), how long can each word-of-day (WOD) be used?

Each is used until it is manually changed.

For a total of three days.

For 48 hours

For 24 hours.

3. (212) Which environment area will increase maintenance problems with dust and sand?

Polar

Jungle

Desert

Mountainous

4. (202) Which of the following CANNOT be performed by the transceiver's computerized components and micro-circuitry?

Specific equipment faults

Internal equipment tests

Internal calibrations

Repair itself

5. (207) Which antenna radiates radio energy equally well in all directions?

Omni-directional

Uni-directional

Bi-directional

Directional

6. (223) Name the process of unscrambling the encrypted information so that it is intelligible

Decryption.

Encryption.

Cryptography.

Cryptanalysis.

7. (215) What occurs when high-energy ultraviolet light waves from the sun enter the ionospheric region of the atmosphere and strike the gas atoms?

Ionization

Modulation

Conductivity

Recombination

8. (240) What assembly on the AN/PRC–150 contains the keyboard and the liquid crystal display (LCD) that makes up the radio's man-machine interface?

Chassis assembly.

Rear panel assembly.

Keyboard display unit.

Upper chassis assembly.

9. (203) A transmission line that consists of a center conductor placed inside a rigid metal tube functioning as the outer tube is called a

Flexible coaxial cable

Rigid coaxial cable

Waveguide

Twin lead

10. (233) Which conventional land mobile radio device serves as the hub of a net?

Portable.

Mobile.

Repeater.

Base station.

11. (212) In mountainous terrain, with a mountain between you and the distant end, which of these antennas is more effective?

Whip

Dipole

Discone

Near-vertical incidence skywave.

12. (204) Which basic field detaches from the antenna and travels through space at great distances?

Radiation

Induction

Gravitational

Electromotive

13. (206) The ability of an antenna to both receive and transmit equally well is known as the antenna's

Bandwidth

Resonance

Reciprocity

Effectiveness

14. (212) Which environment would be considered the most challenging for an RF transmission systems technician to establish and operate a radio station from?

Amazon

North Pole

Sahara Desert

Sierra Nevada Mountains

15. (213) Radio waves that travel near the earth's surface are called

Earth waves

Global waves

Ground waves

Terrestrial waves

16. (201) Equipment used for generating, amplifying, and transmitting RF carrier is collectively called

A receiver

An antenna

A transmitter

A transmission line

17. (203) A nonresonant transmission line is a line

Having reflected waves

Having no reflected waves

With maximum voltage across its open termination

With maximum voltage across its shorted termination

18. (209) What type of directivity does the whip antenna provide?

Bidirectional

Unidirectional

Omni-directional

Near vertical directional

19. (237) In high frequency communications, your station's self address is the address

The user programmed into your system.

It shares with other members.

Of an unprogrammed station.

Of other stations in the net.

20. (207) Which antenna type is usually used on long-range, point-to-point communication where the concentrated radio energy is needed for circuit reliability?

Omni-directional

Uni-directional

Bi-directional

Circular

21. (209) A helical satellite antenna radiates a signal with what type of polarization?

Horizontal

Vertical

Circular

Linear

22. (235) What is a common problem with a mass alert system in a deployed environment?

Low power out.

Efficiency.

Cleanliness.

Reliability.

23. (214) In HF communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the

Maximum usable frequency.

Lowest usable frequency.

Operating frequency.

Critical frequency.

24. (215) Sunspots are disturbances

In the sun’s atmosphere.

On the sun’s surface.

In the ionosphere.

Beneath the sun’s surface.

25. (201) What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce a voltage in the antenna?

Reproduction

Reception

Detection

Selection

26. (206) What does the overall effectiveness of an entire transmitting and receiving system depend largely upon?

Impedance matching

Antenna distance

Antenna properties

Line characteristics

27. (216) What U.S. government agency divides the radio frequency spectrum into different bands?

Federal Aviation Agency.

American National Standard Institute.

Federal Communications Commission.

Institute of Electrical & Electronics Engineers, Inc.

28. (222) What is the first step in electronic warfare application?

Denial.

Detection.

Deception.

Disruption.

29. (226) In frequency hopping operation, the interval at which each transmitter remains on a given frequency for a specific time is known as

Dwell time.

Hopping rate.

Frequency offset.

Transmitter velocity.

30. (204) The concept that alternating current changes in magnitude and reverses its direction during each cycle is

An unproven hypothesis

The definition of propagation

What makes radio transmission possible

What led to the discovery of direct current

31. (236) In the Whelen siren cabinet, what controls signal routing and power distribution of the system?

The landline board.

The control board.

The motherboard.

The radio board.

32. (209) A common satellite antenna is the

Whip

Discone

Parabolic

Long-wire

33. (210) Which type of airborne antenna can be designed into any part of an aerospace vehicle's surface, so that it does not upset its aerodynamic properties?

Fixed blade

Conformal

Probe tip

Whip

34. (229) What identifies the output power of the AN/GRC–171B(V)4 transceiver?

25 watts in both AM and FM.

20 watts in AM and 50 watts in FM.

20 watts in AM and 20 watts in FM.

50 watts in narrowband and 25 watts in wideband.

35. (201) The ability to reproduce the input signal accurately is the characteristics of the receiver's

Fidelity

Capacity

Sensitivity

Selectivity

36. (212) In siting a radio station, which foliage would have more of an adverse effect on radio wave propagation?

Sagebrush

Broadleaf trees

Evergreen trees

Swamp ass

37. (215) How many regions make up the atmosphere?

2

3

4

5

38. (209) What is probably the worst antenna that can be used on sky-wave circuits?

Whip

Dipole

Rhombic

Discone

39. (217) Which frequency band is most susceptible to jamming?

Low frequency.

Medium frequency.

High frequency.

Very high frequency.

40. (203) Which statement concerning waveguides is FALSE?

Very slight damage to the external surface of a waveguide can cause arcing.

Their conductive material construction is easily dented

Effectiveness of waveguides is hindered by moisture

Waveguides can be destroyed by corrosion

41. (204) Areas in which no antenna radiation pattern passes through are called

Nulls

Lobes

Free space

Nonresonant

42. (206) The actual range of frequencies within the antenna's bandwidth is called the

Wavelength

Operating zone

Frequency range

Bandwidth range

43. (203) If a transmission line is terminated in an open, what will likely result?

Signal loss would be negligible

There would be significant signal loss

Current would be at maximum at the termination

Voltage would be at minimum at the termination.

44. (217) What frequency bands does the MILSTAR satellite system uses?

High frequency (HF) and ultra high frequency (UHF).

Super high frequency (SHF) and extremely high frequency (EHF).

Very high frequency (VHF) and SHF.

VHF and UHF.

45. (229) Which statement is NOT a characteristic of the AN/GRC–171B(V)4 transceiver?

It operates from 116 MHz to 149.975 MHz.

It provides antijam communications in AM and FM.

It contains both HAVE QUICK and HAVE QUICK II.

It can communicate on any one of 7,000 available channels.

46. (203) Resistance of the conductor material in a transmission line leads to which type of loss?

Copper

Radiation

Inductive

Skin-effect

47. (205) If the electric field component travels in a plane perpendicular to the Earth's surface, the radio wave is considered to be polarized

Magnetically

Horizontally

Circularly

Vertically

48. (212) What has the greatest effect on an antenna?

The sun

The earth

The operator

The ionosphere

49. (212) Radio sets are left on 24-hours a day in a jungle environment to

Combat fungus

Keep insects away

Prevent short circuits

Maintain frequency stability.

50. (214) The angle at which a radio wave enters the ionosphere is known as the

Skip angle.

Critical angle.

Angle of entrance.

Angle of incidence.

51. (214) In dealing with sky/ground wave propagation, the area of silence where no signals are received is known as the

Propagation distance.

Skip distance.

Dead zone.

Skip zone.

52. (238) Transmitting a signal on a particular frequency in order to determine that channel's usability is referred to as

Call.

Sounding.

Networking

Handshaking.

53. (218) The main very high frequency/ultra high frequency communications emphasis is on

Long range deployable communications.

Short range fixed communications.

Emergency communications.

Air-ground communications.

54. (235) What Air Force instruction (AFI) requires communications squadrons to maintain "installation warning systems"?

AFI 10–2501.

AFI 21–116.

AFI 33–106.

AFI 33–118.

55. (214) Radio waves that angled too low are

Absorbed

Refracted

Returned to earth.

Passed into space.

56. (215) Sunspots occur on an

11-day cycle

11-week cycle

11-month cycle

11-year cycle.

57. (214) Magneton splitting creates two waves called

Direct and indirect.

Ordinary and abnormal.

In-phase and out-of-phase.

Ordinary and extraordinary.

58. 240) Where do the modulation and digital-to-analog conversion take place in the AN/PRC– 150?

Signal processing and control module.

INFOSEC printed wiring board.

Antenna coupler assembly.

Crypto assembly.

59. (219) Super high/extremely high frequency range is limited to

Scattering.

Line-of-sight.

Earth’s conductivity.

Atmospheric absorption.

60. (220) Line of sight radio waves that are guided through the air between two layers of the atmosphere are known as

Channeling.

Guiding.

Ducting.

Piping.

61. (221) Examples of electronic protection includes all of the following EXCEPT

Frequency agility in a radio.

Communications intelligence.

Electronic and material shielding for systems

Process to counter meaconing, interference, jamming, and intrusion.

62. (224) Which switch on the KY–57 VINSON zeroizes channels one through five?

Fill.

Mode.

Power.

Volume.

63. (201) The ability of a receiver to reproduce the signal of a very weak station is the characteristic of the receiver's

Fidelity

Capacity

Sensitivity

Selectivity

64. (213) The earth's conductivity is determined by the type of

Air and moisture content in the propagation path.

Antenna being used at the time of transmission.

Soil and water in the propagation path.

Soil and air in the propagation path.

65. (213) Sky wave transmission is used for which type of communications?

Long distance.

Subterrestrial

Atmospheric

Line of sight.

66. (220) The refractive index of air depends on moisture,

Atmospheric pressure, and temperature.

Atmospheric pressure, and frequency.

Receive signal level, and temperature.

Receive signal level, and frequency.

67. (203) Leakage loss in a transmission line can be minimized by using a

Thinner conductor

Thicker conductor

Very low-resistance dielectric

Very high-resistance dielectric

68. (204) At what point do magnetic fields around a wire no longer have time to collapse completely between alternations?

60 cycles per second (cps).

120 cps.

10,000 cps.

15,000 cps.

69. (209) What is one of the simplest and most functional antennas in use?

Quarter-wave vertical

Half-wave dipole

Inverted-V

GRA–4

70. (211) In selecting an antenna for a circuit, what is the first thing to consider?

Type of propagation

Type of antenna

Distance of the communication

Operating frequency of the antenna

71. (211) In HF communications, by replacing the vertical antenna with a dipole antenna that's a quarter wavelength off the ground, what are you able to get from your antenna transmission?

Higher take-off angle

Increase efficiency

Better reciprocity

Twice the gain

72. (221) Which electronic warfare component responds to taskings to search for, intercept, identify, and locate intentional and unintentional sources of radiated energy?

Attack.

Control.

Support.

Protection.

73. (230) What commonly referred link is the joint tactical information distribution system?

4A.

11.

16.

22.

74. (234) Who has the ability to patch different talkgroups together?

Control station.

Dispatch console.

Portable.

Mobile.

75. (220) What frequency range will show little effect from precipitation?

High frequency.

Ultra-high frequency.

Super-high frequency.

Extremely-high frequency.

76. (232) The family of radios that are scaled for use in all domains, will function with programmable waveforms, and be based on a common core architecture is the

Joint tactical information distribution system.

Single channel ground and airborne radio.

Multiband radio sets.

Joint tactical radio.

77. (203) Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.

8.33 meters

8.33 wavelengths

83.3 meters

83.3 wavelengths

78. (206) What measurement is used to determine whether an antenna is resonant at a particular frequency?

Distortion

Standing wave ratio

Signal-to-noise ratio

Percent of modulation

79. (209) A long-wire's takeoff angle depends on the antenna's

Length

Directivity

Front-to-back ratio

Standing wave ratio

80. (208) Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a

Reflector

Hertz antenna

Marconi antenna

Vertical monopole

81. (224) How many selectable traffic key slots does the KG–84A have?

1.

2.

4.

8.

82. (234) How many talkgroups can a trunked mobile radio monitor at one time?

1

2

3

All the talkgroups programmed in the radio.

83. (215) Scientist call the ionosphere an extension of the

Thermosphere

Stratosphere

Mesosphere

Exosphere

84. (237) What are the three part data handshake between calling and receiving stations?

Call, response, and acknowledgement.

Call, request, and acknowledgement

Sound, handshake, and response.

Sound, call, and response.

85. (220) What permits communication in shadow regions behind obstacles?

Reflection

Scattering.

Refraction.

Diffraction.

86. (208) A dipole or long-wire antenna is an example of a

Whip antenna

Hertz antenna

Marconi antenna

Vertical monopole

87. (230) Which multiple channel access method eliminates the requirement for a net control station in the joint tactical information distribution system?

Code division.

Time division.

Space division.

Frequency division.

88. (219) What is the primary transmission path for frequencies in the super high/extremely high frequency range?

Direct.

Ground.

Surface.

Sky wave.

89. (232) How many programmable devices can the multi-band inter/intra team radio hold?

3.

5

7

10

90. (209) What antenna radiates or receives on many of its particular elements?

Whip

Dipole

Discone

Log-periodic

91. (209) What is the minimum length for a long-wire antenna?

One-quarter wavelength

One-half wavelength

One wavelength

Two wavelengths

92. (220) When comparing the radio and optical horizons, which one is farther away and by what percent?

Optical; 15.

Radio; 15.

Optical; 33.

Radio; 33.

93. (203) Which statement concerning line lengths is TRUE

Frequency and electrical length are inversely proportional

Frequency and physical length are directly proportional

With constant physical length, frequency and electrical length are directly related

With constant physical length, frequency and electrical length are inversely related

94. (236) In the Whelen system, how many digits make up the dual tone multi frequency (DTMF) protocol.

6.

8

10

12

95. (231) What type of network radio does the Air Force use for close air support?

Single channel ground and airborne radio system.

Enhanced position location reporting system.

Joint tactical information distribution system.

Situation awareness data link.

96. (227) From what source does the RT–1523 SINCGARS radio's control module obtain instructions during remote and local operation respectively?

Keyboard interface and front panel

Remote I/O module and front panel.

Keyboard interface and local I/O module

Remote I/O module and keyboard assembly.

97. (239) What is the maximum power of the AN/PRC–150 in FM mode?

5 watts.

10 watts.

15 watts.

20 watts.

98. (203) What two properties of a transmission line determine its characteristic impedance?

Inductance and resistance

Inductance and capacitance

Resistance and capacitance

Length and type of shielding

99. (206) The standard used to measure the radiating effectiveness (gain) of an antenna system is the

Marconi antenna

Isotropic antenna

Hertz antenna

Whip antenna

100. (217) Near-vertical-incidence sky wave operations are most effective when you're using

Lower high frequency (HF) range.

Higher (HF) range.

Medium HF range.

Low takeoff antenna angles.

3D1X3 Volume 2

1. (225) The common name for the method of changing the encryption keys over the radio channel in a two-way radio system is called

2.

What first name or nickname would you like us to use?

2. (228) Concerning HAVE QUICK II communications multiple word-of-day (MWOD), how long can each word-of-day (WOD) be used?

3. (212) Which environment area will increase maintenance problems with dust and sand?

4. (202) Which of the following CANNOT be performed by the transceiver's computerized components and micro-circuitry?

5. (207) Which antenna radiates radio energy equally well in all directions?

6. (223) Name the process of unscrambling the encrypted information so that it is intelligible

7. (215) What occurs when high-energy ultraviolet light waves from the sun enter the ionospheric region of the atmosphere and strike the gas atoms?

8. (240) What assembly on the AN/PRC–150 contains the keyboard and the liquid crystal display (LCD) that makes up the radio's man-machine interface?

9. (203) A transmission line that consists of a center conductor placed inside a rigid metal tube functioning as the outer tube is called a

10. (233) Which conventional land mobile radio device serves as the hub of a net?

11. (212) In mountainous terrain, with a mountain between you and the distant end, which of these antennas is more effective?

12. (204) Which basic field detaches from the antenna and travels through space at great distances?

13. (206) The ability of an antenna to both receive and transmit equally well is known as the antenna's

14. (212) Which environment would be considered the most challenging for an RF transmission systems technician to establish and operate a radio station from?

15. (213) Radio waves that travel near the earth's surface are called

16. (201) Equipment used for generating, amplifying, and transmitting RF carrier is collectively called

17. (203) A nonresonant transmission line is a line

18. (209) What type of directivity does the whip antenna provide?

19. (237) In high frequency communications, your station's self address is the address

20. (207) Which antenna type is usually used on long-range, point-to-point communication where the concentrated radio energy is needed for circuit reliability?

21. (209) A helical satellite antenna radiates a signal with what type of polarization?

22. (235) What is a common problem with a mass alert system in a deployed environment?

23. (214) In HF communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the

24. (215) Sunspots are disturbances

25. (201) What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce a voltage in the antenna?

26. (206) What does the overall effectiveness of an entire transmitting and receiving system depend largely upon?

27. (216) What U.S. government agency divides the radio frequency spectrum into different bands?

28. (222) What is the first step in electronic warfare application?

29. (226) In frequency hopping operation, the interval at which each transmitter remains on a given frequency for a specific time is known as

30. (204) The concept that alternating current changes in magnitude and reverses its direction during each cycle is

31. (236) In the Whelen siren cabinet, what controls signal routing and power distribution of the system?

32. (209) A common satellite antenna is the

33. (210) Which type of airborne antenna can be designed into any part of an aerospace vehicle's surface, so that it does not upset its aerodynamic properties?

34. (229) What identifies the output power of the AN/GRC–171B(V)4 transceiver?

35. (201) The ability to reproduce the input signal accurately is the characteristics of the receiver's

36. (212) In siting a radio station, which foliage would have more of an adverse effect on radio wave propagation?

37. (215) How many regions make up the atmosphere?

38. (209) What is probably the worst antenna that can be used on sky-wave circuits?

39. (217) Which frequency band is most susceptible to jamming?

40. (203) Which statement concerning waveguides is FALSE?

41. (204) Areas in which no antenna radiation pattern passes through are called

42. (206) The actual range of frequencies within the antenna's bandwidth is called the

43. (203) If a transmission line is terminated in an open, what will likely result?

44. (217) What frequency bands does the MILSTAR satellite system uses?

45. (229) Which statement is NOT a characteristic of the AN/GRC–171B(V)4 transceiver?

46. (203) Resistance of the conductor material in a transmission line leads to which type of loss?

47. (205) If the electric field component travels in a plane perpendicular to the Earth's surface, the radio wave is considered to be polarized

48. (212) What has the greatest effect on an antenna?

49. (212) Radio sets are left on 24-hours a day in a jungle environment to

50. (214) The angle at which a radio wave enters the ionosphere is known as the

51. (214) In dealing with sky/ground wave propagation, the area of silence where no signals are received is known as the

52. (238) Transmitting a signal on a particular frequency in order to determine that channel's usability is referred to as

53. (218) The main very high frequency/ultra high frequency communications emphasis is on

54. (235) What Air Force instruction (AFI) requires communications squadrons to maintain "installation warning systems"?

55. (214) Radio waves that angled too low are

56. (215) Sunspots occur on an

57. (214) Magneton splitting creates two waves called

58. 240) Where do the modulation and digital-to-analog conversion take place in the AN/PRC– 150?

59. (219) Super high/extremely high frequency range is limited to

60. (220) Line of sight radio waves that are guided through the air between two layers of the atmosphere are known as

61. (221) Examples of electronic protection includes all of the following EXCEPT

62. (224) Which switch on the KY–57 VINSON zeroizes channels one through five?

63. (201) The ability of a receiver to reproduce the signal of a very weak station is the characteristic of the receiver's

64. (213) The earth's conductivity is determined by the type of

65. (213) Sky wave transmission is used for which type of communications?

66. (220) The refractive index of air depends on moisture,

67. (203) Leakage loss in a transmission line can be minimized by using a

68. (204) At what point do magnetic fields around a wire no longer have time to collapse completely between alternations?

69. (209) What is one of the simplest and most functional antennas in use?

70. (211) In selecting an antenna for a circuit, what is the first thing to consider?

71. (211) In HF communications, by replacing the vertical antenna with a dipole antenna that's a quarter wavelength off the ground, what are you able to get from your antenna transmission?

72. (221) Which electronic warfare component responds to taskings to search for, intercept, identify, and locate intentional and unintentional sources of radiated energy?

73. (230) What commonly referred link is the joint tactical information distribution system?

74. (234) Who has the ability to patch different talkgroups together?

75. (220) What frequency range will show little effect from precipitation?

76. (232) The family of radios that are scaled for use in all domains, will function with programmable waveforms, and be based on a common core architecture is the

77. (203) Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.