e-review est modules 13-16

8/13/2019 E-Review EST Modules 13-16

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EST Module 13

# Answers Questions

1 Ku currrent frequency band given most attention for Satellite Communications

2 30 to 0.3 Angstorms X-rays

3

two or more antennas operating on the

same frequency space diversity transmission means transmitting and receiving on ______

4 Frequency Diversity

ship-to-ship communications system is plagued by fading. Best solution seems to be the

use of

5 440Hz American concert pitch A is equivalent to

6 435Hz International concert pitch A is equivalent to

7 2.20 to 3.30 d band

8 D lowest layer of ionosphere

9 Ionosphere highest layer of the atmosphere

10 F2 don't disappear at night

11 E next lowest layer

12 F2 highest layer

13 0.6 to 0.8 velocity factor of coaxial cable

14 0.5 to 0.9 velocity factor of transmission lines

15 NITA government and military communication

16 Cognitive related to mental processes of knowledge, reasoning, memory, judgment and perception

17 L

for navigation as well as marine and aeronautical communications and radar, ____ band is

used

18 66x48x12.2

accepted official dimension of a mini-DV cassette package used in video recording in

millimeters

19 MC no. 02-05-88

NTC memorandum circular governs the rules and regulations about the manufacture,

acquisition, sale and service of radio communication equipment

20 0.31250 GHz a radio frequency in the UHF band of the radio spectrum

21

knife-edge diffraction when a space-wave signal passes over a mountain ridge, a small part of the signal is

diffracted down the far side of the mountain

22 55 angle of inclination of GPS system

23 350 mm bending of radius for fiberoptic

24 S-Video an analog video signal that carries the video data as two separate signals (brightness and


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color) is called

25 global beam a satellite beam that covers almost 42.4% of earths surface

26 link access protocol modem V.42

27 TDMA multiple access technique used in GSM cellular system

28 BNCconnector is popular in attaching test instruments like oscilloscpes, frequency counters,spectrum analyzers.

29 increase antenna height to increase the transmission distance of UHF signal

30 twisted pair medium used by IBM token ring network that operates at either 4 Mbps or 16 Mbps

31 150dB loudness level in which permanent damage to hearing is possible

32 F-type connector

coaxial cable connector is at least expensive and is widely used for TV sets, VCRs and cable

TV

33 Calibration attenuator which connects passive two-ports

34 Ultraviolet Radiation primary cause of ionization

35 6 to 10 dB increase in sound level commonly perceived by most people

36 114dB sound pressure level if RMS sound pressure is 100microbars

37 N-type connector

coaxial connector is a more complex and expensive but do a better job in maintaining the

electrical characteristics of the cable through the interconnections

38 50 kHz PCS(personal communication system)

39 binaural discrimination cocktail-end

40 FM capture effect

41

all of the choices (density, temperature,

pressure) acoustic behavior of gases

42 200kHz spectrum bandwidth of a single GSM carrier

43 1.6dB noise figure having lowest noise

44 MESFET transistor having lowest noise figure

45 cosmic noise noise outside the solar system

46 5years ECT can apply for registration without examination

47 space wave ionosphere propagate by

48

using the smallest possible radiation angle

ang highest possible frequency maximize the skip distance

49

two or more antennas on the same

wavelength space diversity

50 space waves frequencies in the UHF range propagate by means of


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51 they are very reliable VLF waves are used for some types of services because

52 FM amplitude is constant at all times greatest advantage of FM over AM

53 correlation Companding

54 45MHz PCS(personal communication system)

55 rhythm sound characteristic relates to a sonic time pattern56 40 MHz typical center frequency spacing between adjacent channels (transponders) in satellites

57 12hrs orbital period of GPS constellation

58 plane wave radiowave that is far from its source

59 horizontal polarization electric field that lies in a plane parallel to the surface of the earth

60 -85dBm reference tone level for dBa

61 108 to 114 MHz midband channel A-1

62 from 4 to 11 Huffman coding character contains bits

63 trellis coding modulation

modulation technique used in data communications that is a variant of QAM that includes a

method for forward error correction

64 system capable of generating high power series modulation65 IS-95 cellular standard known as the cdmaOne

66

the one supported by IEEE 802.11

recommendation

medium range

67 PVC most often used for outer covering of coaxial cables

68 10baseT Ethernet system is restricted only to 100m

69 7:8 principal musical intervals is considered dissonant

70 snell light traveling in air optical fiber follow

71 blue shortest wavelength in colors of light rays

72 Huygens Principle

each point on a spherical wavefront may be considered a source of secondary spherical

wavefronts73 ultrasonic high frequency sound that cannot be heared by the human ear

74 very loud apparent loudness level of 80dB

75 refracted ionoshpere causes radio signals to be

76 transmission loss amount of sound reduction provided by a barrier-wall,flooor or ceiling

77 echo perceptible sound repetition

78

splitting of white light into its component

colors in reflection

dispersion is the term used to describe

79 331.5m/s velocity of sound in air at 0 degrees Celcius


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80

physical orientation of electric field in

space

in electromagnetic waves, polarization means

81 -40 to 80 C typical temperature range for installing fiber optical cable

82

space station station located on an object which is beyond and is intended to go beyond the major

portion of the earths atmosphere83 above 30MHz atmospheric noise becomes less severe at frequencies

84 psophometer a device that measures the internal open circuit voltage

85 lengthen the skip distance if the transmitter power remains constant, an increase in the frequency of the sky wave will

86 dependent on the indexes of refraction a light ray enters one medium from another along the normal. The angle of refraction is

87 troposcatter two directional antennas are pointed so that their beams intersect in the troposphere

88 compress run-length encoding

89 4 to 8 best viewing distance of TV screen is ____ times the picture height

90 2.27 dielectric constant of polyethylene (PE) insulator

91 80 dB typical loudness level of an acoustic guitar 1 foot away

92 9.6kbps IS-9593 lower satellite speed increases and its height in orbits gets ____

94

TTC satellite subsystem monitors onboard conditions such as temperature and battery voltage

and transmits this data back to a ground station for analysis

95 ephemeris normally associated with specifying the location of celestial body in space

96 attitude control subsystem satellite subsystem provides stabilization in orbit and senses changes in orientation

97 10 to 1000 microwatts range of speech power

98

employment of highly directional spot-

beam antennas

how does spatial isolation technique satellite communications avoid interference

99 teflon polytetrafluoroethylene(PTFE) is also widely used insulator and is known as

100 tighter bends in installing fiber cable, ____is a long-time use

101 156.8 MHz

designated as the international distress, safety and calling frequency for radio telephony

for stations of the maritime mobile service when using frequencies in the authorized bands

between 156 and 174 MHz.

EST Module 14

# Answers Questions

1 ITU-T new name of CCITT


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2 4:1 Impedance matching ratio of a coax balun

3 double stub load matching over a range of frequencies

4 24 T1 for TDM system

5 C the final amplifier of either FM or AM transmitter operates as class ____

6 8 bits7 center of the antenna where maximum current and minimum voltage values on a resonant Hertz dipole exist

8 request to send ciruit that is turned on

9 A3E and F3C emission designation for facsimile

10 0 degrees latitude

In satellite communication, the geostationary satellites are conveniently located with

respect to the equator at ______

11 A3E refers to a double sideband full carrier

12 at feed point the voltage node of a half-wave antenna exists

13 Gaussian Minimum Shift Keying the modulation technique used by GSM cellular system

14 Circulator

ferrite device that can be used in liue of a duplexer to isolate a microwave transmitter and

receiver when both are connected to the same antenna15 horizontal aiming of the antenna in shipboard satellite dish antennas system, azimuth is referred as the _____

16 throughput the total useful information processed or communicated over a specific amount of time

17 42.5%

approximate percentage of earth coverage of a geostationary satellite at zero degree

elevation

18 V.1

very early standard that defines binary digits as space/mark line conditions and voltage

levels

19 50 kW required minimum power output of an international AM BC stations

20 Iridium system

one of the first satellite system catering personal based communications services

scheduled for operation

21

tropospheric ducting propagation condition is usually indicated when a VHF signal is received from a station over

5000 miles away

22 40dB signal to noise ratio that is required for a satisfactory television reception

23 television emission F3F

24 low noise amplifier single booster installed on the antenna dish of satellite receiver

25 in the receiver front end

noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz)

marine-band receiver

26 E.O. 109

latest government regulation in the telecommunication which provides policy for the

provision of local exchange carrier service


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27 20 Hz frequency tolerance of an AM radio broadcast station

28 Packet Mode

basic mode of transmission system in the public data network in which data are transferred

from the source to the network and from the network to the destination in the frame

format

29 Yagi Antenna

type of beam antenna which uses two or more straight elements arranged in line with each

other

30 Terminal Adapters used to connect non-ISDN equipment to ISDN line

31

Department of Transportation and

Communications executive branch of government in charge of policy making in the telecommunications

32 pilot channel forward link channel

33 binary phase phase reversal keying

34 Huygens Principle

each point on a spherical wavefront may be considered a source of secondary spherical

wavefronts

35 Frequency hopping

term used to describe a spread spectrum communications system where the center

frequency of a conventional carrier is altered many times per second in accordance with a

pseudo-random list of channels

36 both VLF and LF frequency bands can be refracted during the day by the D layer

37 flexible coaxial line considered the most frequently used transmission line

38 virtual height

height of an ionized layer is determined from the time interval between the transmitted

signal and the ionospheric echo at vertical incidence

39 2.8 optimum volume per person of rooms for speech

40 0.8 to 1.2 sec optimum reverberation time at 500 Hz for a cinema

41 IF amplifier establishes the receiver bandwidth

42 500 Hz

Flicker noise is a poorly understood form of noise which may be completely ignored abouth

above ____

43 between 15 to 60 typical gain of a rhombic antenna

44 10,800 voice band channels in a superjumbogroup

45 0.54

illumination factor is normally considered in computing parabolic antenna gain in

microwave communications

46 2.089 in acoustics, reference pressure in lb/ft2

unit

47

American National Standards Institute

(ANSI)

organization that published safety guidelines for the maximum limits of RF energy near the

human body

48 final RF stage measuring a transmitters frequency against a suitable standard, the frequency to be


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measured is taken from the

49 midday ionosphere most ionized

50 12 kHz cellular radios use FM with a maximum deviation of ______

51 goniometer

device that measures the angle between two radio frequencies and also the direction of

propagation of a wave

52 GMDSS

an automated ship-to-shore distress alerting system using satellites and advanced

terrestrial communications systems

53 Calorimeter device that measures rf power by measuring the heat the rf power generates

54 Dominant Mode considered the most efficient mode in terms of energy transfer in waveguides

55 Doppler Effect

In acoustics, ______ is the apparent change in frequency or pitch when a sound source

moves either toward or away from a listener

56 5 mm and 2.5 mm oxygen molecule absorption peaks to electromagnetic wave are at what wavelengths

57 distance-to-reuse ratio (D/R)

in cellular system, the _____ defines the geographic distance that is required between cells

using identical frequencies in order to avoid interference between the radio transmissions

at these cells

58 Frequency agility the ability of a mobile phone to change from one channel (frequency) to another

59 6

in cellular system, the average lead time to install a new base station is approzimately ____

months to a year

60 5150 m/s at one atmospheric pressure, what is the approximate speed of sound in steel

61 space noise noise observable up to 8 MHz

62 20 %

in the American standard, the aural transmitter maximum radiated power is ____ of peak

visual transmitter power

63 2500 end impedance of half-wave dipole

64 GPRS

standardized as part of GSM phase 2+ that can offer theoretical data speeds up to 115

kbit/s

65 258 channel number of an FM station with a carrier frequency of 99.5 MHz

66 15 comparing the capacities of a DVD and an ordinary CD, DVD is ____ times bigger than CD

67 h bend

waveguide passive component that brings a smooth change in the direction of axis

maintained perpendicular to the plane of polarization

68 Wow

a low frequency audible periodic variation in pitch of sound output in high fidelity sound

reproduction system

69 Logatom

_____ is a term in the test language for noise testing in telephone circuits that means a

one-syllable word consisting of a consonant, a vowel, and another consonant


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70

Because their power is increased by class C

amplifiers

why are frequency modulation transmitters more efficient

71 ITU-W not an ITU sector

72 Directional coupler

a component that samples the microwave signal traveling in one direction down to the

transmission line

73 40 dB signal-to-noise ratio is required for satisfactory television reception

74 96 telepone channels in AT 2 line

75 10 W maximum power that can be obtained from a microwave tube at 10 GHz

76 Discriminator circuit detects frequency modulated signal

77

Interpolator form of regenerative repeater for transmitting signals over a long cable received through a

relay in a clearer form

78 10.7 cm band particular wavelength is solar flux measured

79 2.5G enhancement of GSM including the GPRS

80 40 In television, sync-pulse is ____ IRE

81 935-960 MHz base-to-mobile frequency assignment of a GSM system

82 56 bits of PREAMBLE in Ethernet frame

83 100 Hz frequency used in communicating for submerged submarines

84 4240 to 4350 MHz frequency range of radio altimeter

85 blu-ray used for high definition video and data storage

86 18 fiber number of multi-core fiber colored white and black

87 plumbicon camera tubes uses lead oxide (PbO) for the photoconductive target plate

88 1100,1280

in accordance with the ITU specifications, the cutoff wavelength of a single-mode fiber is

from ____ to _____

89 9 RS232C uses ____ circuits for protocol handshaking

90 Dolby standard AC-3

standard adopted by the grand alliance in digital broadcasting for multi-channel audio

source encoding in America

91 URM-70 the cable type used in CCTV that has a maximum run-length of 250 meters

92 resistance lossy real impedance

93 14.8 mm typical diameter of an external diameter direct burial fiber cable

94 350 km latitude of international space station

95 piconet bluetooth

96 hot carrier shotckky??? diode or ____ diode

97 space wave decimetric wave


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98 cryptomeria ciper cryptographic

99 18 mins per hour commercial load for TV

100 10 W

in a single sideband suppressed carrier, what is the maximum instantaneous peak power if

PEP is 50 W

101 cutting an end fiber in preparation to cleaving is a process of _____ connecting two fibers

EST Module 15

# Answers Questions

1 3 Number of turns of a helix antenna

2 F layer Highest layer of the ionosphere during night time

3 60 GHz Oxygen causes what attenuation at what frequency

4 H3E One sideband

5 F2 Thickest layer of the ionosphere

6 300km F1 and F2 layer combines at night time at what distance

7 class C Class of Amplifier used at the last stage of AM receiver

8 local oscillator, mixer, rf amplifier Front-end components of the superhet receiver

9 semi-graded Fiber Optic Fiber optic used for electronic communication

10 120 kHz Carrier swing at 80% modulation

11 single sideband / DSB H designates what kind of modulation

12 dummy antenna Used for testing to avoid interference

13 use a dummy antenna How to prevent interference with the frequency of other stations during testing

14 increase rate of data transfer data switching is used to

15 shorten waveguide link Periscope antenna

16 2 one hop, full-duplex uses how many receivers

17 two way simultaneous transmission full duplex multiplexer

18 dead room a room with great sound absorption and less reverberation time

19 volume unit meter measures speech volume

20 30% red, 59% green, 11% blue luminance

21 pWp unit of noise power in posphometer

22 2300-2400 Hz group 1 frequency assignment for color black

23 1500 Hz group 1 frequency assignment for white


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76

the clocking is with the data of the

synchronous transmission

Difference between synchronous and asynchronous transmission

77

two-wire or four-wire communication

system that connects residences to central

office premises

local loop

78

spreading of color is not always white

(note: spreading is not the real term in the

answer. sorry)

not describe a TV signal

79 1kbps transfer rate when 101001 data is transferred at 6ms

80 simpler, less costly, reliable binary communication is better because

81 technical, financial, legal consideration of new entrant

82 6dB over the gain of one antenna gain of 4 identically polarized antenna stacked one above the other

83 note A above middle C when played in piano or other instruments, note similar to the pitch of 440 Hz is

84

DC and RF heating of resistors then

changes its values

slow drift in frequency for self excited transmitter oscillator circuit resulting to poor

frequency stability

85

Heating of capacitor in the oscillator slow drift in frequency for self excited transmitter oscillator circuit resulting to poor

frequency stability

86

loose connection of oscillator, amplifier

and antenna

abrupt frequency variation of self excited transmitter oscillator circuit resulting to poor

frequency stability which changes frequency oscillation

87 hertzian wave Electromagnetic wave below 5000 GHz being transmitted without artificial guide

88

tropospheric ducting Propagation condition usually indicated when VHF signal is received from a station over

500 miles away

89 bridging function Used to connect data link

90

optic regenerator a fiber optic communication device consist of receiver transmitter used to clean up and

amplify digital data moving from one place to another at opposite direction

91 precedence in sound energy, dominance of the first sound wave in any point of location has ____ effect

92

residual noise level ratio of the level of modulated signal under the conditions of test modulated signal to the

level of unmodulated signal without modulation

93

value-added service provider an entity, relying transmission, switching and local distribution facilities of local excahange

and inter exchange carrier and overseas carriers providing enhanced services beyond

provided by such carriers

94 mobile radio not a common application of microwave communication

95 STX ___ is a character signifies the start of the test for Bisync

96 back wave Oscillator leak through of neutralized amplifier


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97 start of frame delimiter In Ethernet, an 8-bit frame similar to that of a preamble which last two bits are 1s

98

128 In data communications, the maximum variable-length transmission packet is 4096 bytes

and the default is _____ bytes

99 Spark emission Type of emission used for radio telegraph and sidebands on the carrier

100 mean power Average power of a radio transmitter supplied at the transmission antenna

101 ionospheric scatter

EST Module 16

# Answers Questions

1 16:9 The HDTV has an aspect ratio of

2 25kHz The maximum frequency deviation in FM TV signal

3 HE

What is the mode of the waveguide is both the magnetic and electric field is parallel in the

z-component

4 312 552 kHz What is the baseband frequency for basic super group?5 cassegrain antenna What is the most commonly used antenna for satellite?

6 about 300 million meters per second At what speed do electromagnetic wave travel in free space

7 electric and magnetic field An electromagnetic field consists of

8 always seems less than its actual the depth of an object submerged in a transparent liquid

9 horizontal when a magnetic field is perpendicular to the surface of the earth, what is the polarization

10 Fading indicate which one of the ff terms applies to troposcatter propagation

11 tilting

the grounds wave eventually disappear as one moves away from the transmitter because

of

12 skip distance

the shortest distance measured along the earths surface that a sky wave is returned to

earth13 ducting super refraction

14 tunnel diode commonly used for LNA

15 low band VHF channels 2, 4, 5, are

16 band-reject filter filter used for channel 2 to 13

17 500 Hz frequency for reverberation

18 8 to 1.43 GHz space noise is observable at what range of frequencies

19 pan/tilt device a mechanism or device which enables the TC camera to move in lateral and tilting motion

20 antenna which is the first component of any MATV system to receive broadcast signals


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21 52 us time duration for horizontal trace

22 log

listing of the date and time of events, program etc malfunction and corrections in comm.

Systems

23 Rec. 450.1 the CCIR transmission standards for FM sound broadcast at VHF

24 class III-B which of the class station is a regional channel

25 rec. 265.6 CCIR standards for internal exchange of programmes on film for television

26 T-1 The channel for cable TV range frequency 5.75 11.75 MHz

27 0.25 50 The permissible power in kW of station II-A during nighttime is

28 Divx MPEG -4 uses what media format

29 Provide attenuation Glass tube of TWT in coating the aquadag _______

30 5 Maximum deviation ratio for TM

31 186 192 MHz TV frequency band of channel 9

32 Troposcatter propagation A means of beyond the line of sight propagation of UHF signals

33 maintains the altitude Jet thrusters are usually fired to

34 repeater The main function of a communication satellite is as a/an

35 gravitational force and the centrifugal force A satellite stays in orbit because the following two factors are balanced

36 358 km The maximum distance of an apogee of the ISS

37 QPSK What modulation is normally used with digital data?

38 90

When the satellite are spaced 4 degrees of the 360 degrees complete circle, how many

parking space or orbit slots are available

39 3 In ITU frequency allocation, the earth is divided into

40 50,000 hrs What is the lifetime of ILDs?

41 is less than that in A

Light goes from medium A to medium B at an angle of incidence of 40degrees, the angle of

refraction is 30 degrees. The speed of light in B

42 is a universal constant In a vacuum, the speed of an electromagnetic wave

43

to prevent sky-wave and upper ray

interference Distance near skip distance should be used for sky wave propagation

44 space wave Frequencies in the UHF range normally propagate by means o

45 UHF Tropospheric scatter is used with frequencies in the following range

46 blue light of which the following has the shortest wavelength (red,yellow,blue,green)

47 frequency when a beam light enters one medium from another, a quality that never changes is its

48 troposcatter propagation a means of beyond the line of sight propagation of UHF signals

49 sky wave type of radio wave responsible for long distance communication by multi skips is the


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50 SDLC System network Architecture uses what protocol

51 Enhanced Data Rates for Global Evolution EDGE stand for

52 A3 AM type of emission

53 C3F Vestigial sideband emission

54 0 60 degrees celcius Fiber optics range of temperature during installation

55 10 meters Range of Bluetooth

56 384 Using GSM for EDGE, the date transfer rate is _____kbps

57 CDMA Multiplexing used for GSM, 1800 and 1900 MHz

58 C and Ku Most commercial satellite activity occurs in which band

59 vertical when a magnetic field is parallel to the surface of the earth, what is the polarization

60 vertical when a electric field is perpendicular to the surface of the earth, what is the polarization

61 local exchange service area local exchange area defined by the NTC that shares the same local exchange rates

62 Transduction A sub-discipline of acoustics, it is the study of how sound is generated

63 Act no. 3846 States the regulations on radio stations and communications

64 1900-1920 MHz ; 2010-2025 MHz Frequency band of TDM

65 1.66 Numerical value of the gain of a n isotropic antenna

66 75 KHz Maximum frequency deviation for FM

67 2300 Hz Frequency for color black

68 Adaptive multirate Speech coding of 3G system

69 piston Waveguide used by lower cut-off frequency is_____attenuator

70 2.40 to 2.48 Frequency band of industrial, scientific and medical purpose is ___ to ___ GHz

71 class C Class of radio station with 100kW effective radiated power

72 Bessel function Determining the amplitude of an FM sideband requires

73 filter SAW device can be used as

74 10 W Cordless phones beyond 300 ft uses how much power

75 it uses digital signaling technique Not an advantage of LEO satellites for wireless media

76 single carrier, direct sequence Wi-Fi use

77 monitor Not a major section of laser

78 1.0 Noise reduction coefficient at perfect absorption

79 active In fiber optics, splicing

80 4 Category 6 UTP has how many twisted pair

81 superior noise immunity Advantage of PCM over PAM

82 120s How long is a 1Mbit image is transmitted using ISDN(64kbps)


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e-review est modules 13-16

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