QUESTIONIn cellular system, what enables the mobile phone to determine whether it is communicating with its home system or roaming?System identification number (SID)

QUESTIONWhat is any tone produced by a sound source in addition to the fundamental tone?Overtone

QUESTIONWhat frequency is used to signal handoffs to another cell and the termination of the cell in cellular communications?10 kHz

QUESTIONWhat refers to a closure that contains cellular/PCS transmission equipment which comes with heater/airconditioner units (environmental control) and is located inside a hut?Dog House

QUESTIONWhat cellular radio access technology that allows a single transmitter location to provide multiple communication channels by dividing the radio coverage into focused radio beams that reuse the same frequency?Spatial Division Multiple Access (SDMA)

QUESTIONWhat traffic model is based on the assumption that calls not immediately satisfied at the first attempt are held in system until served or abandoned?Poisson

QUESTIONA terrestrial microwave system for the distribution of television, internet and telephone services to businesses and residences.Multichannel Multipoint Distribution System (MMDS)

QUESTIONWhat class of mobile phone has an effective radiated power (ERP) of 6 dBW (4W)? Class I

QUESTIONWhat is the maximum data rate for downstream and upstream of the very high bit rate digital subscriber line (VDSL)?52 Mbps / 2.3 Mbps

QUESTIONA network using microwaves for two-way transmission of telephony, television, and high-speed data.Local Multipoint Distribution System (LMDS)

QUESTIONWhich cabling material is standard for outdoor cables because it resists moisture and stable over a wide temperature range and resists abrasion?Polyethylene

QUESTIONIf the satellite is launched at a speed exceeding 25,000 miles per hour, the satellite will not go in orbit and will break away from gravitational pull of the earth and go out into deep space. What do you call this satellite?Space probe

QUESTIONIn a cable TV system providing internet access, a 6 MHz TV channel can provide data rate of _____Mbps.27

QUESTIONIn cellular system, what defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells?Distance-to-reuse ratio (D/R)

QUESTIONWhat is the frequency tolerance for aircraft stations employing single-sideband transmission?20 ppm

QUESTIONTime Division Duplexing (TDD) is the transmission signal format used by cordless telephone 2 (CT-2) dubbed as the ___________.portable payphone booth

QUESTIONWhat do you call a short bit sequence sent typically 128 bits in digital signatures?Hash

QUESTIONWhat is the maximum daily exposure limit for a loudness level between 100 and 110 dB?20 minutes

QUESTIONA few centimeters long, solid insulated hookup wire that provides a small capacitance to the ground that is adjusted during circuit alignment by bending the wire slightly in one direction or another. What do you call this wire?Gimmick

QUESTIONIn cable TV system, the channel frequency response shall be within a range of how many decibels for all frequencies within 1 MHz + operating frequency of the visual carrier frequency?2 dB

QUESTIONCompliance with the exposure rate limit shall be determined by measurements made with instruments, the radiation sensitive volume of which shall have a cross section parallel to the external surface of the receiver with an area of ______ with no linear dimension larger the 5 cm.10 cm

QUESTIONWhat refers to the crime of finding cellular ID codes by monitoring cellular transmission, then copying the code to another cellular phone and making calls with it?Clone Fraud

QUESTIONHigh definition TV (HDTV) picture is rectangular and contains about ______ times as much information as the current TV picture?5

QUESTIONA radio communications watch or a video communication watch in which an operator is required to maintain a continuous receiver watch to keep a complete log is called __________.copy watch

QUESTIONWhat media format is an MPEG-4 based video compression technology?DivX

QUESTIONCarbon film resistor has a flicker noise voltage of ____ microV.

0.05 to 0.3

QUESTIONThe typical flicker noise voltage range in microV of metal film resistor is _____.0.02 to 0.2

QUESTIONWhat radio system was developed to provide high-speed packet data access for the GSM network?GPRS

QUESTIONWhich of the following wavelengths where absorption of electromagnetic waves becomes peak due to vibrational resonances in the water vapor molecule?1.35 cm and 1.7 mm

QUESTIONWhat do you call a special microwave coaxial cable which is made of hard tubing rather than wire with an insulating cover that can be used on the lower microwave bands?Hard line

QUESTIONWhat is the time period for a single time slot in the GSM TDMA slot structure?8

QUESTIONWhat is a system where cables and/or wires are placed within the ceiling spaced and poked up through the fire-resistance floor structure to the office or room above?Poke through

QUESTIONEnhance Data for Global Evolution (EDGE) uses enhanced GSM technology to provide for higher data transfer rates of ______ kbps than normally available.384

QUESTIONWhat is typical flicker noise voltage range of a carbon-composition resistor in microV?0.1 to 3.0

QUESTIONWhat is a raceway of rectangular cross-section that is placed within or just below the floor, and ties the distribution duct or cell to the terminal or equipment space?Header

QUESTIONIn acoustics, what do you call the pleasant combinations of intervals?Consonant intervals

QUESTIONWhat ITU standard sets the standard for videoconferencing over telephone lines?H.261

QUESTIONWhat is the wavelength range of sunlight?300 to 2000 nm

QUESTIONWhat do you call a three-digit code or shortened phone number that has specific purpose like 166 for police assistance, etc.?Service Code

QUESTIONWhat is a special cable that consists of two parallel wires with a grounded shield around them? It is sometimes used for gigabit Ethernet.Twinax

QUESTIONIn satellite communication system, ________ is a satellite component that senses the time or the incidence angle of solar radiation and provides an electrical signal that may be used to compute the satellite orientation.sun sensor

QUESTIONWhat part of the visible spectrum where camera pickup tubes have the greatest output?Yellow-green

QUESTIONWhat system is used to describe certain systems that distribute signals to many terminals without installing expensive components at every terminal?Passive Optical Network (PON)

QUESTIONIn communication system, what do you call the channel or the path that is used to transmit data, i.e. perform the primary function for which the system is built?Datawire

QUESTIONWhat is the term used to describe a card with an embedded integrated circuit, that can be used for functions such as storing subscriber information for a PCS system?Smart Card

QUESTIONDepending on the terrain, microwave systems use the line-of-sight propagation and require repeaters approximately every _____ km.40

QUESTIONWhich of the standards given below is for terrestrial digital TV transmission?8-VSB

QUESTIONHigh Definition Television (HDTV) has how many horizontal scan lines?1125

QUESTIONWhich of the following is the nearest star of the solar system?Proxima Centauri

QUESTIONIn digital AMPS (D-AMPS), a full-rate TDMA system has _____ digital voice channels combined into one 30-kHz radio channel.3

QUESTIONCable TV uses what frequencies?Between channel 6 and 7 and above channel 13

QUESTIONIn microwave tube, what do you call to any device that causes a wave to propagate at less than the speed of light, so that the electron beam and the wave move at approximately the same speed?Slow-wave structure

QUESTIONWhat data-compression technique takes the advantage of the fact that information bits are often repeated?Run-length encoding

QUESTIONIn radio communications systems, a point on a line between the Earths center an observer located farther from the Earths center than the point is called _______.Nadir

QUESTIONWhat is the frequency of middle C?262 Hz

QUESTIONWhat resistor has a typical flicker noise voltage range of 0.01 to 0.2 microV?Wire-wound

QUESTIONOptimum working frequency (OWF) is normally used for ionospheric transmissions that is chosen to be _______ less than the maximum usable frequency (MUF)?15 %

QUESTIONWhat wavelength division multiplexing involves multiple wavelengths usually less than a few nanometers apart near 1.55 micrometers?Dense Wavelength Division Multiplexing

QUESTIONWhat scrambling method is used in the compact disc digital audio system to ensure that enough transitions between zeros and ones take place to easily recover clocking information?Eight-to-fourteen modulation

QUESTIONWhat is the reason why the number of satellites for continuous communications greater at lower satellite altitudes?Satellite at low altitudes spend less time above the horizon

QUESTIONWhat is the IMT-2000 maximum data rate for pedestrian mobile users and for slow-moving vehicles?384 kbps

QUESTIONWhich of the following best describes the ILS instrument system?An aircrafts cockpit instrument which provides two separate items of information in relation to the runway.

QUESTIONWhat video compression technique deals with low-data rate video such as found on CD-ROM and Internet?MPEG-1

QUESTIONWhat navigation system is based on application of Newtons Law of Motion?Inertial navigation

QUESTIONWhat do you call a card that comes with an 800/888 number that the card owner dials to reach a network that allows them to dial anywhere they like?Prepaid Phone Card

QUESTIONWhat ground based navigation system can provide 88 % to 98% global range?Omega

QUESTIONWhat increase in network capacity can be achieved by 3G wireless system?70 %

QUESTIONWhat instrument normally measures the virtual height of ionosphere?Ionosonde

QUESTIONWhat is the frequency of one octave above middle C?524 Hz

QUESTIONThe frequency synthesizer changes frequencies four times for each bit of time of the serial binary data. The time that the synthesizer remains on a single frequency is called the _________.dwell time

QUESTIONRadiation exposure rates produced by cold cathode gas discharge tubes shall not exceed _____ milliroentgens per hour at a distance of 30 cm from any point on the external surface of the tube.10

QUESTIONWhat are the pulses in the vertical blanking interval or a video signal that creates interlaced scan called?Equalizing pulses

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

QUESTIONThe visual signal level shall be maintained at ____ dB for any channel other than within 6 MHz nominal frequency separation.12

QUESTIONA signaling path provided by a cable TV system to deliver to subscriber terminals TV signals that are intended for reception by a TV broadcast receiver without the use of an auxiliary decoding device and which signals are not involved in broadcast transmission path.Class II cable TV channel

QUESTIONAn inertial navigation system approach in which the inertial sensors are directly attached to the vehicle frame is the ________.strap-down system

QUESTIONWhich antenna is widely used on high-speed aircraft because they can be integrated into the metallic skin of the plane and therefore does not interfere with air-flow dynamics at high speeds?Slot antenna

QUESTIONWhat is the maximum power output of a CB J3E emission?12 W PEP

QUESTIONWhat refers to the many of the major wireless manufacturers have now combined to create a set of de facto standards for creating this content?Wireless Application Protocol (WAP)

QUESTIONA signaling path provided by a cable TV system to transmit signals of any type from a subscriber terminal to another point in the cable TV system.Class IV cable TV channel

QUESTIONIn broadcasting, geographically adjacent stations must be spaced at least _____ channels apart to provide sideband interference protection.3

QUESTIONWhat absorber is which efficient absorption is only possible over a very narrow band approaching 1.0 (total absorption)?Helmholtz resonator

QUESTIONWhat is another name for a single-button microphone?Carbon-button

QUESTIONWhat would be the most important advantage of converting the entire telephone system, including the local loop, to fiber optics?Unlimited bandwidth

QUESTIONWhat type of coupling is used between a waveguide and a waveguide wavemeter?Hole

QUESTIONWhat is the IMT-2000 maximum data rate for mobile users in high-speed vehicles?144 kbps

QUESTIONWhat do you call the ratio of the separation distance between two cochannel cells and the cell radius?Cochannel Interference Reduction Factor

QUESTIONWhat refers to the metallic chambers of various shapes and sizes that are used as parallel-tuned circuits and filters? Cavity resonator

QUESTIONWhat can be an attractive alternative to installing a modem into each computer workstation and attaching a separate telephone line to each modem?Modem pool

QUESTIONWhat do you call the wavelength-division multiplexing has recently come into wide use as a way to increase the capacity of existing fiber optic cables when many different wavelengths are used?Dense Wavelength Division Multiplexing (DWDM)

QUESTIONWhat is the proportion of scanning lines in a video system that, on average, can be used in determining vertical resolution?Utilization factor

QUESTIONWhich navigation system is now standard equipment on most planes, ships and submarines?Inertial Navigation System (INS)

QUESTIONIn bit-oriented protocols SDLC and HDLC, which bit sequence represents the flag?01111110

QUESTIONWhat characteristic of solitons makes them interesting for long-distance fiber optic transmission?Solitons can propagate for very long distances without dispersion

QUESTIONWhat do you call the speech coding process used by the third generation (3G) cellular system?Adaptive multirate

QUESTIONWhat is the term for a periodic variation in refractive index along the length of a fiber?Fiber grating

QUESTIONWhat is the maximum antenna height for CB?60 feet above the ground or 20 feet above the building

QUESTIONWhat term tells how many cycles (Hz) a crystal may differ from its designated frequency for every 106 Hz of frequency?ppm

QUESTIONEssentially, supervisory audio tone (SAT) in analog AMPS is equivalent to _______ in digital AMPS (D-AMPS).Coded Digital Verification Color Code (CDVCC)

QUESTIONWhat do you call the input power needed to generate an electrical current equal to the root-mean-square noise of the detector (or receiver)?Noise-equivalent power

QUESTIONHow much dB gain may represent one S unit?6 dB

QUESTIONWhat is the maximum data rate for GPRS?172.2 kbps

QUESTIONAny radiation produced by a radio transmitter will have an rbe of _____.1

QUESTIONWhat operator frequency is needed to heterodyne 629 kHz up to 3.58 MHz?4.21 MHz

QUESTIONWhat refers to any noise that has equal power per octave?Pink noise

QUESTIONInfrared which is an electromagnetic signal produced primarily by heat covers what range?0.7 to 100 micrometers

QUESTIONIn cellular communications, what do you call the interrupting the voice channel to send control information?Blank and burst signaling

QUESTIONWhat is reduced by rounding off square-wave emissions?Clicks

QUESTIONWhat is the typical center frequency spacing between adjacent channels (transponders) in satellites?40 MHz

QUESTION10 Base 5 Ethernet system is also known as ______.The older Thick Ethernet system

QUESTIONWhat is the frequency equivalent of the international pitch A?435 Hz

QUESTIONIn what scale in which all intervals would be exactly consonant?Diatonic scale

QUESTIONWhat is the approximate critical frequency of F2 layer? 8 MHz

QUESTIONThin Ethernet is colloquially known as ________.Cheapernet

QUESTIONIn multiple-channel digital communications, how many channels make up an extended superframe?576

QUESTIONWhich fiber can amplify signals at 1.53 to 1.63 um and with the addition of resonator mirrors will become a laser that generates their own signals?Erbium-doped fiber

QUESTIONThe capacity of the third generation (3G) digital cellular system is ______ compared to second generation (2G) digital cellular system.2 to 4 times greater

QUESTIONWhat is the predictable horizontal position accuracy of the precise-position service (PPS) of GPS?22 m

QUESTIONWhat is the band of frequencies allocated to Cable Television Relay Service?From 12.17 to 13.20 GHz

QUESTIONWhat is the only way to achieve a wider aspect ratio is to use fewer active scan lines?Letterboxing

QUESTIONWhat is the peak wavelength of sunlight?500 nm

QUESTIONWhat cable is mostly used by 10 Mbps and 100 Mbps Ethernet installations?Unshielded Twisted Pair (UTP) cable

QUESTIONWhat refers to the time from when you go off-hook and when you receive a dial tone from the host switch?Dial-Tone delay

QUESTIONThick coaxial cable is the medium used by what type of Ethernet system?Standard classical

QUESTIONIf twisted-pair wiring is used for gigabit Ethernet, how many pairs of category 5 cable are needed?Four pairs

QUESTIONWhat connector is popular in attaching test instruments like oscilloscopes, frequency counters, spectrum analyzers, etc?BNC

QUESTIONWhat layer in the ionosphere has an approximate single-hop nighttime range of 4130 km?F2 layer

QUESTIONIn acoustics, what do you call the unpleasant combinations of intervals?Discordant interval

QUESTIONWhat is the bandwidth of NBVM (Narrowband Voice Modulation) SSB System?1300 Hz

QUESTIONWhat is the typical power of a cell site transmitter?10 to 50 W

QUESTIONWhat is the international urgency signal for radiotelegraphy?PAN

QUESTIONIf the forward channel radio in cellular system is 875 MHz, what is the reverse channel radio frequency?830 MHz

QUESTIONIn IBM token-ring network, when a special data-grade shielded twisted-pair wiring is used, how many nodes can be supported?260 nodes

QUESTIONIn general, an analog cell site has how many installed radio channels?50

QUESTIONIn a cellular phone, a memory location where telephone numbers to be used in the system are stored is known as _______.Number Assignment Module (NAM)

QUESTIONWhat is the range of distance of the MEO satellites orbiting the earth?8000 km to 20,000 km

QUESTIONCategory 5 UTP cable works with _____ Mbps?100

QUESTIONWhat gas is used by most common jet thrusters?Hydrazine

QUESTIONWhich Ethernet system is limited to 500 meters?Thick Ethernet

QUESTIONWhat do you call the largest time interval in the GSM system frame structure?Hyperframe

QUESTIONHow many time slots per channel is TDMA which is the multiple access method used in GSM?8

QUESTIONIn the TDMA frame of D-AMPS, there are how many bits per frame?1944 bits

QUESTIONWhich of the following is known as the symmetric key cryptography?Private key

QUESTIONWhat unit refers to the amount of radiation actually absorbed?rad (radiation absorbed dose)

QUESTIONWhat is the typical beamwidth range of a horn antenna?10 to 60 degrees

QUESTIONWhat is the listening period of Ethernet LAN CSMA/CD protocol?9.6 microseconds

QUESTIONWho invented the superheterodyne receiver in 1918?Edwin H. Armstrong

QUESTIONWhat standard is used in high speed wireless Ethernet access known as Wi-FiTM?IEEE 802.11b

QUESTIONGeneral Packet Radio Service (GPRS) has an uplink (sending) rate of ______ kbps.14

QUESTIONIn analog cellular system, the interfering signal strength remains approximately less than _____ of desired signal strength to assure negligible interference.2 %

QUESTIONWhat is the unique address of a pager which is sent every time it is paged?Capcode

QUESTIONWhat do you call the random data that is sent continuously by a network interface card (NIC)?Jabber

QUESTIONWhat term used in asynchronous transfer mode (ATM) system to describe a byte?Octet

QUESTIONWhat is the IEEE standard of WiMax?IEEE 802.16

QUESTIONWho introduced the idea of using satellites as relay stations for an international microwave radiotelephone system in 1945?Arthur Clarke

QUESTIONIn microwave communications, what concept may be used to analyze interference by obstacles near the path of a radio beam?Fresnel zone concept

QUESTIONWho coined the word cyberspace in 1984?William Gibson

QUESTIONWireless Internet Service Providers (WISPs) use Wi-Fi technology to provide internet access at airports, hotels, convention centers, coffee shops, and other public places. WISPs offer access to the internet at speeds up to _____ Mbps when users are in range of an antenna.11

QUESTIONLocal Multipoint Distribution Service (LMDS) is a two-way broadband service that allows communications providers to offer a variety of high-bandwidth services to home and businesses, including broadband internet access. LMDS operates at what frequency range.27 to 31 GHz

QUESTIONWhat is a unique form of voice encoding that relies on the values of individual bits to predict the behavior of the incoming signal?Continuously Variable Slope Delta

QUESTIONIn asynchronous transfer mode (ATM) cell format, what indicates the node source and packet destination?Virtual channel identifier

QUESTIONIn which of the following areas is it most difficult to accurately evaluate the effects of RF radiation exposure?In the near field

QUESTIONWhat refers to the Information transmitted to the mobile phone, either subscribed or unsolicited messages, without a user request and are initiated by the server of the content provider?Push Messages

QUESTIONIn acoustics, what is a method of adjusting reverberation within a studio or concert hall by means of loudspeaker feedback system?Ambiophony

QUESTIONWhat refers to the provision of voice communication using Internet Protocol (IP) technology, instead of traditional circuit switched technology?Voice Over Internet Protocol (VoIP)

QUESTIONWhat frequency weighting curves were modeled on the ears response to low and high levels of sound respectively?A and B

QUESTIONWhat is the usual transmission power of most Bluetooth products?1 mW

QUESTIONWhich microphone will be damaged if exposed to high temperature above 52C?Crystal microphone

QUESTIONWhat is the typical bandwidth of the single-mode step index fiber?50 to 100 GHz/km

QUESTIONWhat helps protect data in transit over the wireless link between client device and the AP, via 64-, 128- or 256-bit encryption?Wired Equivalent Privacy

QUESTIONIn broadband ISDN (BISDN), what is the channel rate of H21?32.768 Mbps

QUESTIONWhat refers to the cost-effective, standards-based wireless solution that specifically supports low data rates, low power consumption, security and reliability and is also known as IEEE 802.15.4?ZigBee

QUESTIONIn microwave communications, what is the maximum allowable obstruction as a rule of thumb? 40 %

QUESTIONWhat is an electronic method of reducing or removing unwanted sound by the production of a pressure wave of equal amplitude but opposite sign to the unwanted sound? Active Noise Control

QUESTIONIn microwave communications, what Fresnel zone must be kept largely free from obstructions to avoid interfering with the radio reception? The first zone

QUESTIONEthernet is a baseband system that uses a bus topology designed for use in a local area network. In its packet format, what is used for bit synchronization?Preamble

QUESTIONWhat refers to a relatively new category of wireless communication which uses laser operating in the near-infrared region of the light spectrum?Free-space optics

QUESTIONUltra Wideband is designed for short-range radio that will be used to transmit data between devices over distances as much as ____ feet.20

QUESTIONIn speech transmission for entertainment purposes, which frequency is required in order to capture the naturalness of the speakers voice?80 to 8000 Hz

QUESTIONMP3 is a format for compressing music which delivers almost CD-quality sound. In MP3, a three-minute song can be stored in about ______.3 Megabytes

QUESTIONWhat radio blackout condition is described as weak or minor degradation of HF radio communication on the sunlit side and occasional loss of radio contact?R1

QUESTIONWhat radio blackout condition is described as limited blackout of HF radio communication on the sunlit side and loss of radio contact for tens of minutes?R2

QUESTIONWhat radio blackout condition is described as wide area blackout of HF radio communication and loss of radio contact for about an hour on the sunlit side of earth?R3

QUESTIONWhat radio blackout condition is described as HF radio communication blackout on most sunlit side of earth for one to two hours?R4

QUESTIONWhat radio blackout condition is described as HF radio blackout on the entire sunlit side of the earth lasting for a number of hours?R5

QUESTIONWhich of the following predicts that rf energy decays exponentially when it encounters a conductive medium?Maxwells equation

QUESTIONWhat is the code name for the next version of Bluetooth?Lisbon

QUESTIONWhat is code name for the version of Bluetooth after Lisbon?Seattle

QUESTIONWhat articulation efficiency corresponds to 100% intelligibility for normal speech in practice?80 %

QUESTIONWhat is the Enhanced Data Rate (EDR) of Bluetooth 2.0?2.1 Mbps

QUESTIONWhat is the standard positioning service (SPS) predictable vertical accuracy of GPS?156 meters

QUESTIONWhat is the standard positioning service (SPS) predictable horizontal accuracy of GPS?100 meters

QUESTIONWhat is the precise positioning service (PPS) predictable horizontal accuracy of GPS?22 meters

QUESTIONWhat is the precise positioning service (PPS) predictable vertical accuracy of GPS?27.7 meters

QUESTIONWhat is the precise positioning service (PPS) predictable time accuracy of GPS?200 ns

QUESTIONWhat is the standard positioning service (SPS) predictable time accuracy of GPS?340 ns

QUESTIONWhat is a recent weighting which is used for measuring audible sound in the presence of ultrasound?U-weighting

QUESTIONWhat is the current version of IP addressing used in the internet?IPv4

QUESTIONFor two different sounds, the combined level cannot be more than ____ dB above the higher of the two sound levels. 3

QUESTIONWhat is the envelop delay distortion (EDD) limit of a basic telephone channel between 800 Hz and 2600 Hz?1750 microseconds

QUESTIONWhat do you call the third configuration of satellite transponder that performs the basic amplification and frequency translation functions and also actually demodulates the received signal so that remodulation is necessary to create the downlink signal?Regenerative repeater

QUESTIONWhat ITU-T modem recommendation provides specifications for 9600-bps data transmission rate with true full-duplex operation over four-wire leased private lines or two-wire switched telephone lines?V.32

QUESTIONIn OSI model, BISYNC protocol is under what layer?Data link

QUESTIONA transponder that demodulates the baseband signals and then remodulates a carrier is known as a(n) ________ transponder.regenerative

QUESTIONIn telephony, what circuit disables line amplifiers in trunk circuits to defeat echoes?Echo suppressor

QUESTIONWhat occurs when the voltage level of two successive 1s is the same when using alternate mark inversion data format?Bipolar violation (BPV)

QUESTIONOptical fibers for telecommunications are typically about ____ mils thick and consist of a glass core, a glass cladding of lower index of refraction, and a protective coating.5

QUESTIONCitizen Band (CB) Radio Service is a two-way voice communication service for use in personal and business activities. This service uses how many channels in the assigned frequency range of 26.965 to 27.405 MHz?40

QUESTIONCitizen Band (CB) Radio Service is a two-way voice communication service for use in personal and business activities. This service has an effective communication distance of how many kilometers?8

QUESTIONInfrared technology is used to implement wireless LANs as well as the wireless interface to connect laptops and other portable machines to desktop computer equipped with an infrared transceiver. What is wavelength band used by the typical infrared LANs?780 and 950 nm

QUESTIONWhat do you call a person who works in the field of acoustics?Acoustician

QUESTIONWhat refers to an unwanted audio oscillation which is caused by unwanted feedback and this can be in audio-amplifier states, in rf stages or as result of acoustic feedback?Howl

QUESTIONWhat is the bit-error-rate for a typical satellite channel?1 error in 1 billion bits transmitted

QUESTIONMultichannel Multipoint Distribution System (MMDS) is a technology that enables large amounts of data to be carried over the air from the operators antenna towers to small receiving dishes installed at each customer location. What is the approximate useful signal range of MMDS?30 miles

QUESTIONWhat antenna is used by submarines when submerged and designed to pick up transmission in the low frequency (LF) or very low frequency (VLF) ranges?Trailing wire antenna

QUESTIONWhat are often used to replace local oscillators (los) for channel selection in earth station transmitters and receivers?Frequency synthesizers

QUESTIONWhat is the minimum spectral operating frequency of Ultra Wideband (UWB)?500 MHz

QUESTIONWhich radar frequency bands are used for very long range (e.g. ballistic missile early warning) and ground and foliage penetration?UHF

QUESTIONWhat microwave tube operates like the TWT principles of electron-beam-RF field interaction using a helix slow-wave structure?Backward-Wave Oscillator (BWO)

QUESTIONIn fiber optic cable system, most of the disruptions in the long distance network are a result of physical interruption of a fiber run. These disruptions are commonly called as ______.Backhoe fade

QUESTIONWhat IP addressing uses 128-bit address code resulting to virtually limitless addresses?IPv6

QUESTIONWhat format for compressing music that offers near CD-quality sound stores a three-minute song in about thirty megabytes of size?WAV format

QUESTIONWhat SS method where the signal modulates a carrier that is linearly swept over the band being used? This is used primarily in radar system and in distance-ranging equipment.Chirp

QUESTIONWhat refers to a signal generator usually implemented with a PLL that produces LO and transmitter carrier signals in a transceiver?Frequency synthesizer

QUESTIONMost microwave amplifiers are designed to have input and output impedances of ____ohms.50

QUESTIONWhat is the maximum radiated power of cordless telephone sets?5 mW

QUESTIONWhat is the typical velocity factor of twin-lead line? 0.8

QUESTIONWhat is the typical velocity factor of open-wire line?0.9

QUESTIONWhat semiconductor material is usually used as a rectifier material for photovoltaic cells and for xerographic printing?Selenium

QUESTIONWhat is another way of describing a fade (or reduction in input signal level) where all frequencies in the channel of interest are equally affected?Flat fading

QUESTIONWhat refers to an antenna arrangement technique for reducing the effects of multipath fading in microwave networks?Antireflection

QUESTIONTelecommunications equipment (eg. Cellular base stations) receive their timing signals from the worldwide GPS, an array of satellites that beam timing signals accurate to within _____ to receiving stations located around the globe.300 nsec

QUESTIONWhat refers to the portion of the wireless network that carries the wireless calls from cell site radios back to the mobile switching center (MSC) and then on to the appropriate service termination points such as the public switched telephone network (PSTN) and the Internet?Backhaul

QUESTIONPersonal Communication Services (PCS) is a set of wireless communication services personalized to the individual. PCS is either a narrowband type or broadband type. The narrowband type is assigned to which frequency range?900 MHz

QUESTIONWhat refers to the interchanging of the frequency allocations of carrier channels to prevent singing, reduce cross talk and correct for line slope?Frequency frogging

QUESTIONEarly technology limited the operation of microwave systems to radio spectrum in the 1-GHz range. Because of improvements in solid-state technology, commercial systems are transmitting in what region of the radio spectrum?40 GHz

QUESTIONSynchronous Optical Network (SONET) is an industry standard for high-speed TDM transmission over optical fiber. What is the base signal rate of SONET on both the electrical and optic side?51.84 Mbps

QUESTIONIn broadcast industry, short-haul microwave is often referred to as wireless cable, which comes in the form of Local Multipoint Distribution Service (LMDS) and Multichannel Multipoint Distribution Service (MMDS). What are the two key advantages of wireless cable technology?Availability and affordability

QUESTIONMobile satellite communications are used by the airline, maritime and shipping industry. Which mobile satellite communications service provider has the widest distribution network and operates with a global fleet of 21 satellites?Intelsat

QUESTIONFor educational purposes, who is credited as the first inventor of the telephone?Antonio Meucci

QUESTIONWhat refers to the spurious pattern or other distortion in a facsimile record and was caused by unwanted modulation produced by transmission of a carrier signal?Kendall effect

QUESTIONFiber channel is a high-performance interconnect standard designed for bidirectional point-to-point serial data channels between desktop workstations, mass storage subsystems, peripherals and host systems. What is the key advantage of a fiber channel? Speed

QUESTIONWireless Communications Services (WCS) is a category of service that operates in what frequency band of the electromagnetic spectrum from 2305 to 2320 MHz and 2345 to 2360 MHz?2.3 GHz

QUESTIONPersonal Handyphone System (PHS) is a wireless technology that offers high-quality, low cost mobile telephone services using a fully digital system operating in what frequency range?1.9 GHz

QUESTIONAll cell phones have special codes associated with them. What is this special cell phone code with a unique 32-bit number programmed into the phone when it is manufactured?Electronic Serial Number (ESN)

QUESTIONWhat is the frame rate or refresh rate of a typical PAL format television?50 Hz

QUESTIONWhat is a 3G technology that delivers broadband-like data speeds to mobile devices?EDGE

QUESTIONWhat term is normally associated with specifying the location of a celestial body in space?Ephemeris

QUESTIONWith Baudot Code, an error that is interpreted as a FIGS character can cause all the following information to be interpreted as numerical until the next LTRS character occurs. To reduce this problem, most modern system used what technique?Unshift-on-space (USOS)

QUESTIONIridium satellite system is constellation of 66 low-earth orbit satellites that exists at what particular height above the surface of earth?780 km

QUESTIONWhat is the standard cladding diameter for a single-mode step-index fiber which is considered the most widely used in todays wide-band communication arena?125 micrometer

QUESTIONIn fiber cables, the typical light scattering loss is 2.5 dB at ______ nm of light wavelength?820

QUESTIONWhat is the optimum reverberation time at 500 to 1000 Hz of an auditorium?1.6 to 1.8 s

QUESTIONThe average voltage value of the 3.58 MHz modulated chrominance signal in TV receiver is __________.the brightness of the color

QUESTIONIn cellular system, typically how many cells are in the frequency-reuse plan format?7

QUESTIONA scattering that occurs when light waves interact with vibrations of atoms in a crystalline lattice?Raman scattering

QUESTIONA switching network that does not use a hierarchical structure but instead relies on a computer to find the most direct route between two points.Flat network

QUESTIONA 100 Mbps LAN signaling standard intended for use with fiber optics but also used with coaxial cable.Fiber Distribution Data Interface (FDDI)

QUESTIONWhat is the shape of a trapezoidal pattern at 100 % modulation?Triangular

QUESTIONWhat is an instrument that measures the cumulative exposure to high energy radiation such as x-ray and gamma radiation?Dosimeter

QUESTIONWhat is the minimum ratio of visual signal level to system noise, and of visual level to any undesired co-channel TV signal operating on proper offset performance?36 dB

QUESTIONHow long does a repeater transmit after a mobile signal drops out?1 to 5 s

QUESTIONWhat refers to a series of tones that sound good when used in combination?Musical scale

QUESTIONSolid-state neodymium laser can generate high power at _____ but require external modulation to transmit a signal?1.3 microsec

QUESTIONThe electronic serial number (ESN) assigned to the mobile phone at the factory consists of 32 bits

QUESTIONWhat unit refers to the radiation other than x-rays which will cause an absorption equal to 1 roentgen?rep (roentgen equivalent physical)

QUESTIONWhat is the bit rate in Mbps for terrestrial broadcasting in a 6-MHz channel?19.39

QUESTIONWhat refers to the non-linear effect that occurs at low powers as low as few milliwatts in single-mode fibers and takes the form of a light shifted slightly in frequency from the original light wave?Brillouin scattering

QUESTIONWhich of the following identifies the maximum transmitter power level of a mobile phone?Station Class Mark (SCM)

QUESTIONThe mandatory 24-h ship-to-shore communications from 1910 to 1912 were established by the United States, Great Britain and other maritime nations as a direct result of the sinking of the two famous ships. Which of the following are the two ships?Republic and Titanic

QUESTIONWhat increase in sound level is commonly perceived by most people?6 to 10 dB

QUESTIONWhat is low-level signal in a telephone receiver deriving from the transmitter in the same instrument?Sidetone

QUESTIONHow is encryption of data for purpose of privacy commonly achieved? By using public-key encryption

QUESTIONWhat is the equivalent frequency of the American concert pitch A?440 Hz

QUESTIONAt what wavelengths does oxygen molecule absorption peaks to electromagnetic wave?5 mm and 2.5 mm

QUESTIONWhat is typical capacitance variation of most varactors used in frequency modulators?12 to 1

QUESTIONWhich of the following is considered the two most popular IF of TV receivers?36 and 46 MHz

QUESTIONWhat is the maximum power of a class III analog cellular phone?3 W

QUESTIONWhat expresses the steepness of the skirts or the skirt selectivity of a radio receiver?Shape factor

QUESTIONThe ratio of calls that are irregularly terminated to the total number of calls made during the measurement period is called ______.drop call rate

QUESTIONRefers to the reflection at the interface between two optical materials that is dependent on the difference of their refractive indexes and the angle at which light strikes the interface.Fresnel reflection

QUESTIONRadiation exposure rates produced by a TV receiver shall not exceed ______ milliroentgens per hour at a distance of 5 cm from any point on the external surface of the receiver.0.5

QUESTIONWhat refers to a communications system in which a common time interval is not established between transmitting stations and receiving stations?Anisochronous system

QUESTIONWhat is a plug-in circuit board for a computer that contains the necessary hardware and firmware to connect the computer to a local area network?Network interface card

QUESTIONWhat frequency-sharing technique uses highly directional spot-beam antennas to prevent interference between stations on the same frequency?Spatial isolation

QUESTIONWhat is essentially a cell site (shelter) that is mounted on a flatbed tractor-trailer used for emergency purposes?COW

QUESTIONWhich of the following principal musical intervals is considered dissonant?7:8

QUESTIONWhat are being used to sign important documents sent electronically?Digital signatures

QUESTIONIn a propagation medium, such as in the glass of an optical fiber, _______ is the scattering of an electromagnetic wave by particles with a size about equal to or greater than the wavelength.Mie scattering

QUESTIONWhich of the following are antennas made with microstrip on PCBs?Patch antennas

QUESTIONIn cellular system, what defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells?Distance-to-reuse ratio (D/R)

QUESTIONIn wide area networks, what routing technique requires each node to take the incoming packet and retransmit it onto every outgoing link?Flooding

QUESTIONWhat do you call the camera signal output without sync?Noncomposite video

QUESTIONWhat is referred to as the formation of trapped gas pockets in an optical fiber?Blooming

QUESTIONHow will you consider a network that assumes each cable in a LAN to carry only data signal at a given time and no modulation is used?Baseband

QUESTIONWhat are used to allow fiber optics to operate with much higher data rates and over longer distances without repeaters than any other system now in use?Soliton and heterodyne reception

QUESTIONIn color CRT, what refers to the adjustment of the three electron beams so that each lands on phosphor dots of the appropriate color?Purity

QUESTIONIn SSB transmitters, the average power is typically between _______ of the peak envelope power (PEP) with typical human speech. one-fourth to one-third

QUESTIONIn addition to maintaining the position of the satellite in orbit, what do you call the means that must be provided to position the satellite for optimum performance?Attitude control

QUESTIONThe light generating process in both LEDs and laser diodes results from the recombination of electrons and holes inside a p-n junction, called ________.electroluminescence

QUESTIONWhat describes the various patterns of electric and magnetic fields of a waveguide?Modes of the waveguide

QUESTIONIn a rotating communications satellite, an antenna with a mean beam that is continuously adjusted in direction with respect to the satellite so that the antenna illuminates a given area on the surface of the earth is called _______.despun antenna

QUESTIONHow many bits in block can be corrected by using a Hamming Code?1

QUESTIONIn TV receivers, what type of convergence is provided by adjusting the permanent magnets?Static convergence

QUESTIONWhat is the maximum data rate of fiber optic cables?10 Gbps

QUESTIONWhat is the approximate critical frequency of the E layer?4 MHz

QUESTIONThe number that identifies a mobile phone (the mobile telephone number) in a cellular system is called a _______.Mobile Identification Number (MIN)

QUESTIONPolytetrafluoroethylene (PTFE) is also widely used insulator and is known asteflon

QUESTIONWhat type of filter uses acoustic waves on the surface of a substrate to achieve the desired response?Surface Acoustic Wave (SAW)

QUESTIONWhat refers to the self oscillation in an RF amplifier that does not occur at the tuned frequency of the amplifier?Parasitic Oscillation

QUESTIONWhat C-type line conditioning is for access lines and trunk circuits associated with private switched network?C3

QUESTIONIn communications system, the total system noise in the absence of information transmission is called _________.background noise

QUESTIONWhat is the reason why the Smith chart is circular in form?Because it is the convenient way to represent the fact that impedances on a transmission line repeat every one-half wavelength.

QUESTIONAn error-correcting system in which errors are corrected at the receiver using redundancy transmitted data without using retransmission request.Forward Error Correction (FEC)

QUESTIONIn klystron, what is the cavity that velocity-modulates the electron beam?Buncher

QUESTIONHow many horizontal lines are blanked out in the frame of TV receivers by V blanking?42

QUESTIONIn a single-tube class C amplifier, why is the radiated modulated envelope not made up of varying amplitude dc pulses?Because of flywheel of LC tank

QUESTIONWhat LED is the usual signal source for plastic fibers?Red LED

QUESTIONWhat type of messages in the radio control channel of cellular system tells a particular mobile telephone that a call is to be received?Pages

QUESTIONSystem noise of a cable TV system is specified in terms of RMS voltage or its mean power level as measured in the 4 MHz bandwidth between ____ MHz above the lower channel boundary of a cable TV channel.1.25 to 5.25 MHz

QUESTIONWhat is the primary cause of echo and singing?Mismatch between the balancing network and its two-wire connection

QUESTIONWhat class of mobile phone has a maximum power level specified as effective radiated power (ERP) of - 2 dBW (600 mW)? Class III (portable phone)

QUESTIONIn IMT 2000, what does 2000 refer?Both implementing date which is year 2000 and operating frequency of about 2000 MHz

QUESTIONA system that allows users to access documents from widely separated sources on the internet using a common interface.World Wide Web

QUESTIONWhat principle is employed in cellular telephony to allow simultaneous transmission and reception without the need to push to talk?Frequency duplex

QUESTIONWhy might it be difficult to produce music transmissions with phase-type SSB?Because it is difficult to produce 90 degree AF phase network to 5 or 10 kHz

QUESTIONTo what frequency must the gated-beam quadrature circuit be tuned in an FM BC (broadcast) receiver?10.7 MHz

QUESTIONWhile the called telephone is ringing, the central office switch sends a pulsed ac voltage to the calling telephone. What is that signal called?Ringback signal

QUESTIONWhat is the reason why tropospheric ducting not used very much for practical communications system?Because it is not reliable

QUESTIONCable TV companies collect signals and programs from many sources in a facility called _______.head end

QUESTIONWhat oscillator whose frequency is controlled by a binary number written to an internal register?Numerically-controlled Oscillator

QUESTIONWhat sweep frequencies could be used on a scope to stop an envelope pattern of 600 Hz modulation?Any submultiple of 600, 300, 150 etc.

QUESTIONHow close to a mobile microphone should the lips be?2 inches

QUESTIONA wide area mobile radio telephone system with its own switch base stations and transmission by utilizing radio frequencies.Mobile Telephone System

QUESTIONWhat helps protect fibers against degradation caused by moisture?Cabling

QUESTIONFor an angle of incidence equal to the critical angle, the light will be refracted ________.along the normal

QUESTIONIf a rocket contains more than one satellites, the smaller satellite that will be launched after the main satellite is called ________.secondary payload

QUESTIONHow much more feed-point Z does a folded dipole have than a normal dipole?4 times

QUESTIONA device that converts audio frequency-modulated lightwaves into a sound tone by causing a crystal to vibrate at the audio modulation frequency of the lightwave is called ______.optoacoustic transducer

QUESTIONIn Ethernet LAN, what situation arises when two or more terminals try to transmit on the network at the same time?Contention

QUESTIONWhat is considered as a non-continuous noise?Impulse noise

QUESTIONWhat is the bandwidth allocation to each voice channel in analog telephone signals?4 kHz

QUESTIONThe antenna effective height is _____ to _____ of the actual height to 2/3

QUESTIONDamage to cells of the reproductive tissues due to exposure to intense rf radiation is called what?Genetic

QUESTIONWhat is the frequency separation between the forward channel and the reverse channel of cellular radio?45 MHz

QUESTIONWhy are geostationary satellites unsatisfactory for communications from regions near the poles of the earth?The angle of elevation of the satellite is too low in these regions

QUESTIONHow many TV fields are recorded on one slant tract of tape?1

QUESTIONWhat do you call the first note of a musical scale?Root note

QUESTIONWhat devices are to be inserted in a telephone channel if the total via net loss (VNL) of a given trunk circuit exceeds about 2.5 dB?Echo suppressors

QUESTIONIn general, what frequency range does troposcatter wave propagation found to be effective?350 MHz to 10 GHz

QUESTIONWhat is the typical loudness level of a watch ticking? 20 Phons

QUESTIONA lens has an 8-cm focal length and 4-cm diameter. What is its f rating?2

QUESTIONHow many time slots are there in the basic GSM frame structure?8

QUESTIONWhat is the maximum power output of a CB A3E emission?4 W

QUESTIONWhat modulation method is used by enhanced data for global evolution (EDGE)?8 PSK

QUESTIONWhat is referred to as the change in the direction of polarization of signals passing through the ionosphere?Faraday rotation

QUESTIONWhat are the reasons why a cavity resonator is preferred than conventional circuits at microwave frequencies?The Q of a cavity resonator is very high and conventional circuits have impractically small dimensions at microwave frequencies

QUESTIONWhat is the maximum height above average terrain for a class B FM station?500 feet

QUESTIONA television receiver design that uses mixing between the picture and sound carriers to generate the sound intermediate frequency. What do you call this sound?Intercarrier sound

QUESTIONWhat are pulses that retain their shapes as they pass through optical fibers?Solitons

QUESTIONWhat microphones are predominantly used in Aviation services? Dynamic microphone

QUESTIONWhich of the following is considered the major obstacle of the video-on-demand service of cable TV system?Bandwidth

QUESTIONWhy downtilt used in cellular base stations?Because it can be used to reduce the range of a base station to reduce interference.

QUESTIONWhat refers to the ways that the voice signal used in communications is dealt with prior to being applied to the modulator?Speech processing

QUESTIONGPS satellite takes how many hours to complete one orbit?12 hours

QUESTIONWhat might be a reliable range mobile-to-mobile?1 to 10 miles

QUESTIONWhat type of license allows a software package to be installed on any and all workstations and servers at a given site?Site license

QUESTIONRefers to the transmission of brief text messages, such as pages or e-mail, by cellular radio or PCS.Short Messaging Service (SMS)

QUESTIONWhat is a signal on a frequency separated from the desired signal frequency by 2 times the IF value that interferes with reception?Image

QUESTIONThe portion of the horizontal blanking pulse before the sync pulse is known as ________.front porch

QUESTIONIn cellular system, what is data signaling channel that handles the administrative overhead of the cellular system?Paging channel or control channel

QUESTIONAt what frequency does magnetron in a microwave oven operate?2.45 GHz

QUESTIONIn a client-server network, what LAN software makes sure that data on the server that is being changed by one station is not simultaneously read by another? Record locking

QUESTIONWhat splicing is performed by butting the tips of two fibers together and heating them so they melt together?Fusion splicing

QUESTIONDamage to cells other than the reproductive tissues due to exposure to intense rf radiation is what?Somatic

QUESTIONWhat is another term for pink noise?Flicker noise

QUESTIONWhat refers to a telephone that rings another phone without dialing?Hot line

QUESTIONWhat do you call the range over which the reference frequency can be varied and still achieve phase lock?Capture range

QUESTIONWhat is the typical efficiency of a parabolic antenna?55%

QUESTIONIn television, special effects and production switching are done by the _____.SEG

QUESTIONWhat is the maximum deviation of cellular radios that use FM?12 kHz

QUESTIONWhat is the noise-reduction effect that occurs with strong FM signals?Threshold effect

QUESTIONIn what order would a three-stage transmitter be tuned?Oscillator, driver and PA

QUESTIONA system for the broadcast and automatic reception of maritime safety information such as but not limited to navigational/meteorological warnings, search and rescue information, urgent information by means of narrow band direct printing telegraphy.NAVTEX

QUESTIONIn the GSM system, _______ is the telephone number that is unique to a given user worldwide.International Mobile Subscriber Identification (IMSI)

QUESTIONWhat is the variation of the discriminator which greatly reduces sensitivity to amplitude variations, at the cost of 50% reduction in output voltage?Ratio detector

QUESTIONWhat is the dielectric constant of polyethylene (PE) insulator?2.27

QUESTIONWhat are commonly used to replace conventional LC tuned circuits at UHF and microwave frequencies where one-half wavelength is less than 1 foot?Transmission lines

QUESTIONThe colors in the color test signal are arranged in the order whose luminance levels form a signal whose amplitude decreases from left to right. What do you call this signal?Staircase signal

QUESTIONSound provides all sorts of information. What information is related to mental processes of knowledge, reasoning, memory, judgment and perception?Cognitive

QUESTIONWhat factor is the cut-off frequency of waveguide dependent upon?Physical factor

QUESTIONWhich physical characteristic of vacuum tube devices is used to generate power at microwave frequencies?Electron Bunching

QUESTIONWhat is the first type of modulation, using a SB microphone called?Absorption or loop

QUESTIONIn PM, a frequency shift occurs while what characteristic of the modulating signal is changing?Amplitude

QUESTIONThere are how many orbital planes which are equally spaced around the equator in the GPS operational constellation?6

QUESTIONWhat may cause ionic disturbance characterized by rapid fluttering sound, hence voice communications are poor?Aurora borealis

QUESTIONThe maximum radiation form electronic equipment must not exceed _____ mr per week.100

QUESTIONWhat refers to any sonic, infrasonic or ultrasonic wave which is emitted from an electronic product as a result of the operation of an electronic circuit in such product?Radiation

QUESTIONWhat is the most ambitious of the proposed LEO systems?Teledesic system

QUESTIONHow is the assigned frequency related to the suppressed carrier frequency with J3E emissions?1.4 kHz higher

QUESTIONWhat is the disadvantage of low IFs?Can cause image interference problems

QUESTIONWhy does a higher-impedance line have lower copper loss than a lower-impedance line?Because higher-impedance line has lower current for a given power level.

QUESTIONWhat is the minimum ratio of visual signal level to the RMS amplitude of any coherent disturbances such as intermodulation products or discrete-frequency interfering signals not operating on proper offset assignments?46 dB

QUESTIONWhat is a system that uses electromagnetic frequencies in the optical spectrum for detection and ranging determination of objects in a manner similar to radar?Light detection and ranging

QUESTIONWhat code is used in the100 Base Tx Ethernet standard?Three-level Manchester code

QUESTIONIn video compression, _______ is the current digital video specification.MPEG-4

QUESTIONWhat were the three methods of generating carriers before VTs were used?Spark, Arc and Alternator

QUESTIONThe peak-to-peak variation visual signal level caused by undesired low frequency disturbances (hum or repetitive transients) generated within the system, or by inadequate low frequency response, shall not exceed _____ of the visual signal level.5 %

QUESTIONWhat IC FM demodulator that uses a differential amplifier and capacitive storage peak detectors plus tuned circuits to translate frequency variations into voltage variations?Differential Peak Detector

QUESTIONA signaling path provided by a cable TV system to relay to subscriber terminal TV broadcast programs that are received off-the-air or are obtained by microwave or by direct connection to a TV broadcast station.Class I cable TV channel

QUESTIONWhat results from the luminance component interfering with the color signal? It occurs whenever there is diagonal detail in the picture and gets worst with motion.Cross luminance

QUESTIONWhy are printed circuit boards, such as stripline and microstrip implemented on transmission lines?To create resonant circuits and filters

QUESTIONWhy do fading J3E signals distort less than fading A3E signals?SB not beating against fading carrier

QUESTIONWhat is the maximum VF tone that may be fed to a voice signal?+6 VU

QUESTIONIn klystron, what do you call a cavity that removes some of the energy from the electron beam and transfers it in the form of microwave energy to the output?Catcher

QUESTIONWhat is the shifting of antenna pattern so that the major lobe is at an angle below the horizontal?Downtilt

QUESTIONWhat is the standard signal format of a numeric paging receiver?NEC D3 Standard

QUESTIONIn SSB, the transmitter output is expressed in terms of __________.peak envelope power (PEP)

QUESTIONIn SSB, the transmitter output is expressed in terms of __________.peak envelope power (PEP)

QUESTIONWhat type of noise occurs only in devices where a single current separates into two or more paths such as bipolar junction transistor?Partition noise

QUESTIONWhy does a high-Q circuit discriminate against harmonics?Because of purer sine wave ac

QUESTIONThe satellite location is specified by a point on the surface of the earth directly below the satellite. What do you call this point?Subsatellite Point (SSP)

QUESTIONWhat refers to a circuit for digitizing voice at a low data rate by using knowledge of the way in which voice sound is produced?Vocoder

QUESTIONWhat is defined as a fixed or mobile station used for the transmission of television and related audio signals, signals of standards and FM broadcast stations, signals of instructional television fixed stations, and cablecasting from the point of reception to a terminal point from which the signals are derived are distributed to the public?Cable Television Relay Service (CARS) station

QUESTIONWhat do you call the line that is terminated by its own impedance?Nonresonant or resistive or flat line

QUESTIONWhat usually is the antenna used for radars?Horn with a parabolic reflector that rotates over a 360 degree angle.

QUESTIONIn TV system, if the color oscillator does not operate, the trouble is _________.no color

QUESTIONWhat refers to the sampling of an analog signal using a sample-and-hold circuit, such that the sample has the same amplitude for its whole duration?Flat-topped sampling

QUESTIONWhat do you call the technique of cooling artificially the amplifiers used with very low level signals to reduce noise?Cryogenics

QUESTIONWhat terminal of a dc charging generator should be grounded to reduce radio noise?Armature

QUESTIONWhat is usually the final amplifier stage in the several stages of amplification of a typical AM transmitter?Power amplifier

QUESTIONThe orbits of GPS satellites are nearly circular with inclination angles of _____ degrees relative to the equator?55

QUESTIONWhat is the term used to describe an ordinary voice telephony?Plain Old Telephone Service (POTS)

QUESTIONWhat is the main disadvantage of a single-tube transmitter?Frequency instability

QUESTIONWhat is the velocity of a geostationary satellite in orbit?6879 statute miles per hour

QUESTIONWhat is the specified cell site transmit power of CDMA cellular system? 1.25 W

QUESTIONWhat is the data transmission rate of the North America AMPS?10 kbps

QUESTIONF3 emission means carrier is frequency modulated by _______.voice

QUESTIONTwisted pair is used by IBM token ring network that operates at either ______ Mbps?4 or 16

QUESTIONWhat amplifier is made to appear inductive or capacitive by phase shift and is used to produce wide-deviation direct FM?Reactance modulator

QUESTIONIn North America, what digital audio compression system substitutes the MP3 audio?Dolby AC-3

QUESTIONSelectivity of the TV signal is provided by what particular filter?Surface Acoustic Wave (SAW)

QUESTIONWhat is the achievable data rate of the third generation (3G) cellular system?More than 2 Mbps

QUESTIONIf an audio line loses high frequencies, what can be added to it to flatten the response?Equalizer

QUESTIONWhat is considered as the simplest transmitter that is keyed on and off to produce CW Morse code?Oscillator

QUESTIONWhen real time communication is required, the only way to address the second problem is to uses a ________ containing more than one satellite.constellation

QUESTIONAlpha particles and fast neutrons have an rbe of ____.10

QUESTIONWhat is the typical noise figure of metal semiconductor FETs or MESFETs used at microwave frequencies?2 dB or less

QUESTIONIn a cellular or PCS system, what refers to the connection of a mobile to two or more base stations simultaneously?Soft handoff

QUESTIONWhere does most of the gain and selectivity in a superhet found?In the IF amplifier

QUESTIONAcoustic shock refers to the physical pain, dizziness and sometimes nausea caused by hearing a sudden very loud sound. The threshold of pain is about _____.120 dB

QUESTIONWhich waveguide accessory is sometimes referred to as the magic T?Hybrid T

QUESTIONWhat is the frequency of subcarrier modulated by the different signals in an FM stereo multiplex transmission?38 kHz

QUESTIONWhat is another term for parity check?Vertical redundancy check (VRC)

QUESTIONWhat circuit permits selective signaling by allowing only low-frequency tones to trigger the squelch?Continuous Tone Control Squelch (CTCS)

QUESTIONWhat do you call the distortion created by using too low a sampling rate when coding an analog signal for digital transmission?Aliasing

QUESTIONWhat is the typical value of line turn around?1.5 ms

QUESTIONWhat is the voltage of the local-loop on-hook? -48 Vdc

QUESTIONWhich pulse in V blanking corresponds to 3H lines wide?V sync

QUESTIONWhat is the data rate (in bits per voice channel) of digital telephone signals?64

QUESTIONWhat is the speech coding rate in GSM cellular system?13 kbps

QUESTIONWhat is the typical value of vidicon dark current?0.2 microA

QUESTIONIf a public key is used to encrypt the message then what is required to decipher it?Private key

QUESTIONWhat antenna has its beamwidth determined by the dimensions of its horn lens or reflector?Aperture antenna

QUESTIONWhat is the main disadvantage of the two-way paging system over the one-way paging system?The two-way paging system is more expensive

QUESTIONWhat algorithm is used in MPEG-2 compression?Discrete Cosine Transform (DCT)

QUESTIONIn TV receiver, what convergence is provided by varying currents through the convergence coils?Dynamic convergence

QUESTIONWhat is used to fire a geosynchronous satellite to attain its final circular geostationary satellite?Apogee kick motor

QUESTIONWhich camera tube uses lead oxide (PbO) for the photoconductive target plates?Plumbicon

QUESTIONWhat is the main accelerating element in a CRT?Ultor

QUESTIONWhat do you call the formula used to calculate the overall noise performance of a receiver or of multiple stages of RF amplification?Friis formula

QUESTIONWhat is the least expensive LAN topology but is disabled if one station fails?Ring

QUESTIONWhat is the fastest physical configuration of LAN?Bus

QUESTIONWhat is used in SSB and CW receivers to produce a carrier that will mix with the input signal in the demodulator to generate the audio output?Beat Frequency Oscillator (BFO)

QUESTIONWhat is the science of measuring light visible to human eye?Photometry

QUESTIONWhat is the minimum loss of a head end processor as RF input/output terminal match?16 dB

QUESTIONWhat is a method of providing high-speed data transmission or twisted-pair telephone loops by using high-frequency carriers?Asymmetrical Digital Subscriber Line (ADSL)

QUESTIONA signaling path provided by a cable TV system to deliver terminal signals that are intended for reception by equipment other than a TV broadcast receiver only when used with auxiliary equipment.Class III cable TV channel

QUESTIONWhat is the typical range of the cellular CDMA system?13 miles

QUESTIONWhat do you call the ratio that expresses the percentage of incident voltage reflected on a transmission line?Reflection coefficient

QUESTIONWhat is the metal object threaded into a waveguide to add capacitance or inductance?Tuning screw

QUESTIONWhat is another term for carrier frequency?Rest frequency

QUESTIONWhat effect is electro-optic modulation dependent upon?Electro-optic effect

QUESTIONWhat refers to a measure of the relative variances in propagation delay of signals on the telephone lines?Envelope Delay Distortion

QUESTIONHow does a mobile transmitter signal its control channel in trunked system?Digital words

QUESTIONWhat is used by the TV color receiver to retrieve the color signal?Synchronous demodulation

QUESTIONWhat splicing is performed by joining two fiber ends either by clamping them within a structure or by gluing them together?Mechanical splicing

QUESTIONWhat is the tonal ratio of an octave?2 to 1

QUESTIONWhat refers to one bit time for the pseudorandom code?Chip

QUESTIONAt what loudness level do pitch (in mels) and frequency (in Hz) are numerically equal?40 dB

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