e-review est modules 3-4

8/13/2019 E-Review EST Modules 3-4

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EST Module 3

# Answers Questions

1 Inverse square law What is the distance of density diminishes per gravity distance?

2 IF amplifier sensitivity

3 T1 The channel of tv cable frequency range of 5.75MHz-11.75MHz

4 0.1 Mechanical splice attenuation loss is

5 330 m/s The velocity of sound is considered to be constant at

6 AWG #19 Commonly used telephone wire

7 Radome A low loss dielectric material is used to cover a dish

8 critical frequency What is the highest frequency that can be sent straight upward and return?

9 Numeric assignment module NAM stands for?

10 Better rejection ratio Rf stage preceeds a superhet reciever ,1 advantage of a good rf stage is

11 Maximum impedance What is the input impedance of a quarter wave length shorted stub?

12 1mW The maximum power output of subscriber

13 0.3-3MHz The medium frequency band

14 different The acoustics of most auditoriums when the room is full

15 non linear Any device to be used as a frequency multiplier

16 jitter What is a continuous impulse with spikes with short duration with high amplitudes?

17 Erlang B What is the traffic model?

18 B8E Independent side band

19 higher capacity The advantage of a cable communication system over a broadcast system

20

It increases the antennas resonate

frequency What happens in a capacitor is added in series in an antenna?

21 0.1-0.3 % Refers to the relative refractive index

22 30MHz What is the most commonly used intermediate frequency of radar receivers?

23 12

Not more than___ digits make up an international telephone number as amended by

CCITT

24 Produce electromagnetic interference Twists in twisted wire pairs

25

The frequency range over which is

expected to perform well What is made by the term ?????????????????????

26 footprint Area of earth the covered by a satellite radio beam

27 bay Speaking of antenna, __ is a section of antenna in which would be a complete antenna by


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itself

28 type acceptance

Is the process by which a customer maybe accepted with the absence of establish

interference standards that corresponds to the specifications

29 azimuth What is the horizontal angle?

30 resolution In the TV system is a measure of ability to tell the lining picture31 45 minutes KBP radio code handles the station provides a minimum of __ commercial

32 transponder Which of the following is the basic component for satellite receiver?

33

Antenna which can be used more than 1

band due to the use of power in LC

networks

In radio communication the term trap antenna is referred to one of the following

statements

34 The base of the antenna The current maximum in a marconni antenna is found at ____

35 to 2/3 The antenna effective height is _ to _ actual height

36 Intelligent terminal A computer terminal that will program the perform function

37 coaxial cable The most commonly used Transmission Line in TV system

38 F3F What type of emission is produced when a frequency modulated is modulated on TVsignal?

39 The approximation of quantized signal What causes quantization in a PCM system?

40 4% With lights not polish into fiber it produces a loss of

41 Frequency synthesizer Frequency division is useful to implementation of a ____

42 Signal to noise improvement An advantage of FM over AM

43 Overhead Characters that must be transmitted other than data

44 Top Loading What is used in antenna in order to increase it effective height?

45

Intensity modulation with polarization

modulation Which modulation methods are the most widely used?

46 Decrease the impedance If the diameter of conductors are two wire Transmission Line

47 4.5 MHz Is the aural monochrome television broadcast channel?

48 Frequency Deviation sound generating Modulating waveform for FM will cause a greater ____

49 Increased by 50% The modulation index of an AM is changed from 0 to 1 the transmitted power is

50 Behaves as a series short circuit What will happen in a quarter wave Transmission Line is opened?

51 On hook state Every time the telephone is answered the handset is of the _ state

52 infrared Most fiber optic light sources emit light in which spectrum

53 30cm Lightning rods mounted at top of structure

54 audio stage What particular stage does frequency provides fidelity?


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55 photovoltaic Which of the following is not a common light detector

56 Depends on the formation of charge The gunn diode oscillator

57 3 Creators shall require to provide local exchange service

58 mixer Which major element has super heterodyne receiver must be non linear?

59 purely reactive The SWR is infinite60 crystals The most commonly used filter SSb generators uses ____

61 3000-30000MHz Klystron oscillators freq range of _____

62 end effect Shortening effect

63 0.09 dB What is the average insertion loss of fusion splice in Fiber Optic Cable?

64 slow fading Which of the reception problem that is not multipath?

65 mush

66 X.75 it is a protocol used to connect the other packets

67 3 dB what is the power loss of a telephone hybrid?

68 0.05 index multimode optical

69 MTBF what is a measure of reliability express as an average number?

70 Antenna Gain

Term that refers to the numerical range which relates the performance of one antenna to

theoretical antenna

71 6.312 Mbps what is the gateway telecommunications T2?

72 50-150Mbps High speed LANs data rate

73 10GHz rainfall is an important factor of frequency above ____

74 Analogue cellular technology what is the basis of the first generation wireless?

75 ducting when microwave signals follow the curvature of the earth?

76 PCM quantizing noise occurs in ____

77 Pi-L what network provides the greatest?

78 SSB voice what type of signal selectivity?79 Discriminator what circuit is used to detect frequency modulated signal?

80 4 number of voice transmission that can be ?????????????????

81 1.3 micrometer popular line wavelength Fiber Optic Cable

82 Semiconductor which is the simplest effective in changing?

83 50 milliseconds are used in all communication system when propagation time exceeds ___

84 dBr which stands for dB relative?

85 Water vapor and oxygen atmospheric attenuation

86 239ms minimum propagation delay of geo satellite


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87 Quad cable consists of twisted pairs of conductors, each separately insulated

88 30 -53 KHz stereophonic FM

89 40 dB signal to noise ratio required for satisfactory TV reception

90 STX Start of test for BISYNC

91 hash Short bit sequence 128 bits92 V.1 rules and description binary

93 loudness affected by the distance

94 TTC information about satellite send to earth

95 plane wave if away from source

96 dopplers effect measures speed

97 ionosonde measures virtual height of ionosphere

98 solid sound travels fastest at

EST Module 4

# Answers Questions

1 balun To connect coaxial to a parallel wire

2 0 dB Gain of an isotropic antenna

3 radiation resistance What is the term used for an equivalent resistance that would dissipate the same amount?

4 log normal fading Resulting from obstruction losses

5 omnidirectional Radiation pattern of a discone

6 ultraviolet Band of light waves

7 vertical marconni antenna Which of the following antennas receives signals from all direction in horizontal plane?

8

the beamwdith increases as the gain is

increased What happens to beamwidth?

9 2100 UTC 3:00 PM is a standard time

10 radiation resistance + ohmic resistance What is the total resistance of an antenna system?

11 1pW In which crosstalk dBx ????????

12 by installing a good ground radar system How can be antenna efficiency ????????????

13 lambertian source What optical source radiates light in all directions?

14 X modem What is the protocol that is used in transferring files?

15 40 dB What signal to noise ratio for satisfactory TV?


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16 100meters ,95% of the time What is the GPS ???????????????

17 twice the highest frequency According to the nyquist theory the sampling rate is _____

18 broadside array It consists of a number of dipoles

19 space or direct wave Line of sight mode of propagation

20 the amount of radiation received from thesun what causes a maximum frequency Vary ???????????????

21 bluetooth The low power short range wireless technology

22 0.38dB What is the insertion loss of connector splices?

23 2174.5 kHz Which of the following frequency is normally used in safety communication?

24 antenna directivity What determine the ability of a radar?

25

the velocity of the wave divided by the

velocity of light What is the meaning of velocity factor?

26 44.736Mbps For T carrier system, T3 has a bit rate of _____

27

because the conductor resistance is low

compared to the radiation resistance A half wave antenna operates at very high efficiency ____

28 quantizing Process of a signing pcm codes absolute magnitudes

29 spacing bias distortion What distortion is does not cause by TL characteristics?

30 local oscillator After IF stages

31 sun spot Spot in the visible surface of the sun

32 25 what is the number pins of R232 C?

33 antenna efficiency what for the ratio of radiation resistance to the total resistance?

34 -90dBm what is the reference tone level for dbm?

35 50dB what is the quantization signal to noise ratio if an 8 bit PCM is used?

36

two or more antennas operating in the

same frequency Which is space diversity?

37 D The lowest layer in the ionosphere

38 poor front end selectivity What causes a interference?

39 detector stage Cross modulation in the receiver is eleminitaed at the ____

40 marconni antenna Which of the ff antennas require good grounding?

41 limiter In an FM receiver which circuit is used amplitude variations

42 horizontal What deviation is measured for an angle?

43 230 milliseconds What is the minimum propagation delay for stationary satellites?

44 asynchronous A unique character is transmitted at the beginning of each message


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45 14/11 GHz Ku band

46 radio detector tv receiver that separates sound

47 bearing and distance indication the TACAN is a nav aid providing ___

48 30-50kHz what is the spectrum of FM signal?

49 R3E what is the emission designation of single sound reduced carrier signal?50 256-2048Hz the mid range frequency range of sound is

51 1dB the standard deviation of in transmission loss should not exceed

52 the telephone network will pas DC modem are required to connect

53 an inducting reactance what kind of impedance 1/8 wavelength TL present to a generator?

54 impulse noise what noise is short duration?

55 500Hz what is the channel spacing of ???????????

56

efficiency = radiation resistance divided by

total resistance X100% how is antenna efficiency computed?

57 ultraviolet absorption an absorption loss caused by valence electron

58 modem is a device in data transmission to interface a data to analogue59 30MHz what is the most commonly used IF of radar receivers?

60 F1 layer layer that exist only during daylight

61 30-53kHz frequency spectrum ??????

62 bandstop Attenuates signals that passes frequency below

63 zone of silence skip zone

64 land station Station in the mobile service not intended to use

65 independent sideband The letter number designation B8E

66 0.635 15cm What is the typical separation between two conductors?

67 EWX ?????????? Which of the following pulse modulation is ???????????

68 coil Connecting an antenna electrically add a69 V series An ITU-T that deals with the telephone circuits

70 phase shift Cause some frequency to be delayed with respect to other frequency

71 diffraction Occurs when a microwave beam is at point

72 cathode end of a helix The input signal of a TWT

73 reflectometer An equipment used to measure SWR

74 WAP Is a standard where mobile phone can access to specially tailored internet websites

75 equatorial regions In what region of the world is sporadic E

76 aeronautical fixed service A radio communication service used for aeronautical safety navigation


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77 a very low impedance What kind of impedance wavelength?

78 TE Propagation mode microwave

79 1.25MHz How far is the visual carrier of monochrome TV channel?

80 circular polarization A helical antenna is used for satellite tracking

81 from south to north What is ascending pass for a LEO?82 SWR as near as 1:1 as possible A properly connected Transmission Line has a ____

83

no transmitted power is wasted in the

carrier

What is the primary advantage of ?????????????

84 waveguide switch What device is used in diverting electromagnetic?

85 hertz antenna A type of underground antenna

86 yagi uda A type of array which contains of 1 half wave dipole, 1 reflector and 1 director

87 decreased What happens to a path wave as it is shorted through the use of loading coils?

88 reflection What do you call the incident light that have different refractive indeces?

89 1000 Hz What is the standard test tone used for audio measurements?

90 FM Capture effect is most pronounced in what type of emission91 14kbps What is the GPRS uplink rate?

92 high efficiency What is the advantage of Doherty linear?

93 30 Hz Frequency of VCR control signal

94 ribbon A type of microphone which has a permanent magnet

95 erlang C Block calls delays

96 on hook condition On a telephone system, the loop is open during ___

97 trunk A telephone line connecting two central offices

98 95 -100 The SPL in dB of an auditorium with contemporary music is ___

e-review est modules 3-4

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