Correct Answer Only

Front 1

#01*. Modulation enables signals to be transmitted at frequencies

Back 1

Higher than the original

Front 2

#02*. What purpose of modulation involves modulating low frequency signals for transmission over long distances?

Back 2

Ease of radiation

Front 3

#03. What factor determines the spacing of the sidebands in an amplitude modulated signal?

Back 3

Frequency of the modulating signal

Front 4

#04*. The relationship of the bandwidth required for dsbec am to the bandwidth of the modulationg signal of the am bandwidth alone is

Back 4

twice the modulating bandwidth

Front 5

#05. what type of device is used to recover the intelligence signal in dsbsc modulation?

Back 5

Heterodyne detector

Front 6

#06. In double sideband suppressed carrier modulation, the intelligence is reconstructed by modulating the received signals at the exact frequency and phase relation as the

Back 6

carrier frequency

Front 7

#07. What is the relationship of the ssbsc bandwidth comapared to dsbec or dsbsc signals?

Back 7

SSBSC requires half the bandwidth of the other two

Front 8

#08. The output of the oscillator in a FM modulator increases in frequency with each

Back 8

positive half cycle of the modulating signal

Front 9

#09. In FM, the amount of oscillator frequency change is

Back 9

directy proportional to the amplitude of the modulation signal

Front 10

#10. A 10khz modulating signal has enough peak voltage to cause a deviation of 30khz. What is the modulation index?

Back 10

3

Front 11

#11. How many sidbands does FM produce?

Back 11

An unlimited number

Front 12

#12*. In PM, the carriers

Back 12

phase is shifted at the rate of the modulating signal

Front 13

#13. By using 8-psk instead of binary phase shift keying, information capacity is increased

Back 13

three times

Front 14

#14*. What is the first step in the pulse code modulation process?

Back 14

the analog signal is band limited

Front 15

#15. Non uniform quantizing and companding decreases the length of the code word from

Back 15

11 to 7 bits

Front 16

#16. How fast can an asynchronous transfer mode network potentially move data?

Back 16

600 mbps

Front 17

#17*. How does synchronous transmission reduce the overhead costs of data transmission?

Back 17

Blocks many characters together for transmission

Front 18

#18*. Which RS-232C signal is the data from the data communications equipment to the data terminal equipment?

Back 18

Recieve data

Front 19

#19. Which rs-232c signal indicates the modem is ready to transfer data?

Back 19

Data set ready

Front 20

#20. The minimum pins required to establish a two-way data communications path with the RS-232 standard are

Back 20

Pins 2, 3, and 7

Front 21

#21. Which standard designates the electrical standards for a balanced voltage digital interface circuit?

Back 21

RS-422

Front 22

#22. What is the transition region voltage in an RS-422 line driver?

Back 22

-2.0 to +2.0

Front 23

#23. Which standard uses many of the same pins and functions as RS-232?

Back 23

RS-530

Front 24

#24*. Approximately what percentage of all network problems are cable related according to the National Association of Communications Contractors?

Back 24

70 percent

Front 25

#25*. When using vertical redundancy check, what significance does the amount of ones have in a data bit pattern?

Back 25

Determines parity

Front 26

#26*. Using the longitude redundancy check method of error correction, what does receiver compare with the transmitter to ensure an accurate transmission of data?

Back 26

Block check character

Front 27

#27. What two error detection methods, when used together, are 98 percent effective in detecting errors?

Back 27

Vertical redundancy check and longitudinal redundancy check

Front 28

#28*. What is the most common error correction technique?

Back 28

Automatic retransmit on request

Front 29

#29 When using forward error control as a method of error correction, where does error correction take place?

Back 29

Receiving end

Front 30

#30*. Which statement describes an advantage of using fiber optic cable

Back 30

Electromagnetic fields do not affect fiber optic cables

Front 31

#31. The designation of one-millionth of meter is

Back 31

Micron

Front 32

#32*. Most fiber optic links use infrared light that has a frequency range of about

Back 32

750 to 1500 nm

Front 33

#33*. What two important facts must be considered when light is propagated through a prism or fiber?

Back 33

The refractive index and angle at which the light strikes the junction

Front 34

#34*. A knowledge of the principles of refraction includes the normal, angle of refraction, and

Back 34

angle of indices

Front 35

#35. Propagation of light as seen by Snells law is known as

Back 35

total internal reflection

Front 36

#36*. How is attenuation measured in fiber optics?

Back 36

Decibels per kilometer

Front 37

#37*. The two main causes of attenuation in an optic fiber result from absorption and

Back 37

rayleigh scattering

Front 38

#38. The most useful way to classify optic fiber cables is by

Back 38

refractive index profile and number of modes

Front 39

#39*. In fiber optics a mode can best be described as

Back 39

the path light travels down fiber

Front 40

#40. Which classification type of fiber optical cable has the highest dispersion throughout its lenth?

Back 40

Multimode step-index

Front 41

#41. A fiber optic cable in which the core has numerous concentric layers of glass is classified as

Back 41

multimode graded-index

Front 42

#42. What type of buffer allows the fiber optic cable to be twisted or pulled with little stress on the fiber?

Back 42

Loose tube

Front 43

#43*. What outer jacket material used on fiber optic cables has a low resistance to sunlight and abrasion?

Back 43

Polyvinyl chloride

Front 44

#44. The basic building block of a breakout cable is known as the

Back 44

subunit

Front 45

#45. What components make up a complete basic fiber optic link (exclude fiber connections)?

Back 45

Driver, source optic fiber, detector, and an output circuit

Front 46

#46. Two types of light sources for fiber optic modems are light-emitting diodes and

Back 46

semiconductor laser diodes

Front 47

#47*. What is one of the requirements a light source must have to be beneficial?

Back 47

Risetime must be fast enough to meet bandwidth requirements

Front 48

#48. What type of emitter has an "etched well" created in the N-type gallium aluminum arsenide material?

Back 48

Surface

Front 49

#49. What is the PN junction called in a light emitting diode where photons are emanated?

Back 49

Depletion region

Front 50

#50. What type of current is produced by a photo detector when no light is present?

Back 50

Dark

Front 51

#51*. The responsivity of a photodetector is dependent on the

Back 51

wavelength of light

Front 52

#52. What photodetector converts one photon to one electron?

Back 52

Positive intrinsic negative

Front 53

#53*. Which fiber optic cable configuration consists of multifiber cables?

Back 53

Breakout cables

Front 54

#54. Which fiber optic connectors do not have a keying device?

Back 54

Sub-miniature, typeA

Front 55

#55. Which of the following is not performed during the system-engineering phase of predeployment?

Back 55

Ensuring equipment readiness

Front 56

#56. When performing equipment checks in the predeployment stage, what frequencies and configurations should you use?

Back 56

The frequencies and configurations spelled out in the frag order

Front 57

#57*. All of the following is covered in the predeployment briefing except the

Back 57

exact duration of the deployment

Front 58

#58*. The employment phase of a mobility exercise begins when the

Back 58

first element of the convoy departs

Front 59

#59. The employment phase of a mobility exercise ends when the

Back 59

the end-ex order is received from the governing authority

Front 60

#60. The first step in recovery at the employment site is to

Back 60

conduct a safety briefing

Front 61

#61*. Into how many Aerospace Expeditionary Forces is the Air Force Total Force divided?

Back 61

10

Front 62

#62*. Aerospace Expeditionary Forces ares sized to

Back 62

meet steady-state rotational requirements for forward deployed forces

Front 63

#63*. If assigned to an Air Force Expeditionary Force, how often can you expect to be deployment vulnerable?

Back 63

90 days every 15 months

Front 64

#64*. What is developed for systematic planning of force packages?

Back 64

Unit type codes

Front 65

#65. What is the unit type code identifier for communications and information?

Back 65

6k

Front 66

#66*. Name the nerve center for all deployment activity thoughout the a.f.

Back 66

AEFC

Front 67

#84. Which of the following records and drawings pertain to broadcast systems equipment only?

Back 67

Broadcast facility records

Front 68

#85. What project phase is a good time to try to identify and solve any potential problems?

Back 68

Review

Front 69

#87. Which cabling provides interconnectivity between buildings

Back 69

Backbone

Front 70

#88. The mechanical terminations, patch cords, and jumper cables used to interconnect the media are considered part of which cabling structure?

Back 70

horizontal

Front 71

#89. Pairs in multipair cable are twisted to

Back 71

minimize crosstalk

Front 72

#90. What is the color code of pair 3 for the horizontal unshielded twisted pair?

Back 72

W-g,g

Front 73

#91. When placing RG-58 cables the maximum pullng tension allowed is

Back 73

25 pounds

Front 74

#92. Which of the following distributes the backbone and horizontal fiber optic cables?

Back 74

Star

Front 75

#93. How many cross-connects are allowed from the main cross-connect to the horizontal interface located in the telecommunications closet?

Back 75

2

Front 76

#94. Single-mode fibers can provide a backbone distance link of up to

Back 76

60 km

Front 77

#95. What is used to prevent the direct contact of the securing devices to the cable's outer sheath?

Back 77

Cable shims

Front 78

#96. A minumum of how many connection ports per work area will all new installations of wall outlets in the local area network distribution system have?

Back 78

Two

Front 79

#97. What impact tool is used to terminate the conductors af a CAT-5 cable to on a patch panel?

Back 79

D-814

Front 80

#98. What do you terminate the conductors of a CAT 5 cable to on a patch panel?

Back 80

110 conductor slots

Front 81

#99. The cables used to extend the central office feeder cable to the main cross-connect are marked with what color tags?

Back 81

Green

Front 82

#100. What is used to test for direct current resistance?

Back 82

Ohmmeter