DLSC EST coaching 1 - Oct 2012
Answer Question2728 khz L600 mastergroup baseband has a bandwidth of
525 No. Of lines scanned per frame in the raster on a picture tubeAcquisition The time when the FET is “on”
Equal In data comms employing baud rate is ___ bit rate.Solar cycle High freq waves are affected by
800 lux Minimum recommended illumination when readingDubbing Combining of two sound signals into a composite recording
Bandwidth of the tuned circuit What determines the selectivity of a receiver16:9 Aspect ratio of HDTV
300 kHz to 3 MHz Ground wave is most effective in what frequencyNut Total cost of a radio or TV program, production, or sponsorship
15 dBrnCO Noise when measured across tip and ring terminals of a network shall be
Munsell color scale Set of charts used in color TV to verify hue, brilliance and chroma
96 How many voice channels are there in a DS-2 digital signal hierarchy for TDM?
Antennas At very high freq, transmission line acts asLost calls of 5% If the grade of service of a telephone system indicated P of 0.05,
what does it mean?RF signals A mobile receiver experiences “dead” areas of reception as a
result of shading of the _______ by hills and treesUnicode A text code that makes use of 16-bit long code wordsD layer Layer present only at daytime
Poor freq stability Major problem with VHF oscillatorF-7 type What is the least expensive connector that is widely used for
CATV, VCRs and TV sets?Dipole Antenna whose technical equivalent is ʎ/4 line is open circuited
Noise immunity An advantage of digital over analog transmission.ʎ/4 vertical antenna Antenna used for radiating AM broadcast band
Attracts electrons toward the face of the tube
In a TV picture tube, what is the purpose of large picture tube voltage?
1 mV typical output voltage of a magnetic microphoneGlass fiber core Optical fiber with the smallest beamwidth
Carrier oscillator BFO in SSB receiver called15 Noise when measured across tip and ring terminals of a network
shall be _______ dBrnCO.Radiant flux Another term for optical density.
Conical Horn Antenna Microwave antenna formed from a circular waveguide.Walls of the guide What causes the attenuation present in a waveguide?
Dream Team
ANSWER KEYWORD/S
Chorine What halogen is greenish yellow gas
CycleIn thermodynamics, Any process or series in which the system return to its original condition or state
Sublimation Changing solid to vapor state or vice versa
PD 1986 What law created MTRCB
Isobaric Process which a system remains under constant presure
Ductile Substance which can be easily drawn into wire is called
Wider Bandwidth Advantage of FM over AM
Aspect ratio of TV 4:1
Reflectometer Device use to measure SWR
1/Y Pink noise
AWG # 19 Commonly use telephone wire
Early reflection of sound Echo
Hartley theoremSets the limit on max. capacity of a channel in a given noise level Shannon
Bipolar coding DS….1 coding
Phase distortion Problem in high speed
Shannon – Hartley theorem Information capacity using signal to noise
Pure tone Sine wave
Electromagnatic Most commonly use in conventional telephone handset
Convergence White dot and cross hatch generator are chiefly used in
Bit rate In FSK, rate of change of frequency at the input to the modulator
Absorption coefficientNo. from 0 to 1 indicating ability of a material to absorb saoud energy
Acoustic velocityA complex number equals to the ratio of complex pressure amplitude to the complex amplitude of the volume density
Frequency translation Up or down conversion of 1 frequency to another
Session layer OSI layer responsible for dialog control and synchronization
Equalizing pulses Sent during vertical
Tandem Blanking connect central office to other main lines
Mesh Topology that is immune to bottleneck
Synchronous Multiplexer system in public network
Attenuation Fiber optics specs in db/km
Intrinsic material Fiber optic light electron pin diode is doped
Dynamo effect Tube
Intelsat in America Domsat system
Multiplexing Best modulation
VLF Submarine use
Early bird First commercial satellite
Less time TDMA multiple access used for control
Tandem Telephone system used in central office
Multiplexing Transferring more data in one medium
Coding of Audio Visual Object Another name of MPEG 4 ( Motion Picture Expert Group)
Thick ithernet Using RG-11
Panning In Video, Slow moving of camera lens to other scene
14 kbps Data rate of GPRS
72.2 kbps Bit rate of GPRS
X.25 ITU standard for WAN
60 Channel of super group
25 Number of pins in RS232C
MSEUF
F2 What layer in ionosphere is the most dense ?Octet In ATM, what describe a byte?Quantizing Distortion To protect small signal in PCM from __________Yellow What color is the most luminance?Semiconductor laser What type of laser is used in optic fiber communication?VHF Suitable LOS propagationHorizontal gain Measure the length of the sweep….CRT…Bay Section, which would be a complete antenna by itselfBalance Detector What FM circuit not use in mobileLocal Oscillator Sending signal…free running…approximately equal speedAssynchronous Most suitable in LOS propagationVertical, Horizontal When an oscilloscope is used as a vectrograph . . . . . __________
amplifierIncrease What happens to the velocity of air when it passes through
vacuum?Physical LayerEarly Bird What is the first commercial satellite?Broadcasted the first voice message from space
The satellite “SCORE”
FEC The forward Error checking in data in the receiver?FSK Modulation used in telegraphy?Pink noise What is the other term for “1/f” noiseRest Unmodulated carrier of fm is _____ frequencySemiconductor laser Laser used in fiber optic communicationVHF For los propagationPeak envelop power SSB powerPanning Slow moving of camera from 1 scene to anotherGray Weak red, weak blue, weak green
PUPM
ANSWERS QUESTIONS
384 kbps 3G rate for slow moving pedestriansNull Very low or no signal in antenna
Probability of error Theoretical or Mathematical expectation of error in a given system
X.38 X series recommendation for G3 facsimileTDMA Technique used in IS-961978 GPS was first used
1khz-299Mhz Low frequency band for optical amplifiermel Unit of pitch
4.5Mhz Inter-carrier frequency in NTSC standardGG CATV Hyperband channel
Marconi Antenna of vertical and ground portiondrift Long term frequency deviation in FM broadcasting
Modulated Amplifier Modulates the carrier100-1000THz Optical fiber1Hz-150Mhz CATV LowpassKeyed AGC AGC in TV receiver
capspan Rotates motorE Lowest layer in ionosphere HF
384 kbps Slow moving pedestrianProbability Error Error rate
Anti-tinkle Pulse dialling5 Local central office
varistor CompensatingInduction coil Interlacing
Crosstalk The microphone pre-amplifier’s balanced differential input reduces the likelihood of __ from the receiver circuit.
Chroma 3.58MhzMu Law The parameter describing the degree of signal compression by
the companders in the US network isMore harmonicsNotch Antenna Open slot antenna
360-366Mhz Kk Hyperband of CATVSLIC Subscriber’s Line Interface Card
Kelvin Temperature used in determining the audio frequencyWCDMA New system, 3G mobileClass A Can raise power in amplifier in AM
Bodies of Water Duct can be made fromGreen Straight line in color CRTDiode 2nd detector in AM1897 Strowger step by step
30 GHz Highest frequency that can be generated by IMPATThigher The speed of light in the air compared to speed of light in glass
is______Electromagnetic What type of receiver is most commonly used in a conventional
telephone setHalf duplex Speaker phones operate in________mode
Ambiophony Reduced reverberation55% Efficiency of parabolic antenna
64 bit interval 7 bit outputVaristor Compensate the loop length
Induction Coil Interface of the handsetTrunkline Connect central offices
ELECTROMAGNETIC What type of receiver is most commonly used in a conventional telephone handset?
LINEAR The simplest form of coding is ___.10 Pulse dialing occurs at a rate of ___ pulses per second
ZENER DIODES Transient protection for integrated telephone circuits is typically provided by ___
F CONNECTOR The most popular plug for RG59U coaxial cable is the56000 An added performance feature of modern modems is the
provision of data rates of up to ___ bps
EITHER-WAY Ground start is ___ signaling that is instantaneous
SMU
ANSWER KEYWORD/S
556 Horizontal TV
612.75 Up and down TV
ATTENUATION Can happen to TEM
AGC Adjust the …. TV
ISE (INDEPENDENT SIDEBAND EMISSION)
B8E
8 TDMA
CFAA microwave tube amplifier uses an axial magnetic field and a radial electric field. This is the ____.
30The number of frames per second that uses two ground planes
POIN, VARLEY LOOP
BANDPASS FDM
FET TWT
BACKWARD WAVE OSCILLATOR
An oscillator that unlike pulse device
MOBILENegative resistance in Gunn diode is achieved by moving electrons from less ___ energy level.
G/T A figure of merit for Tyro to achieve signal from satellite
PULSE WIDTH A DMT technique can be attained by dividing the ____.
4.5 MHZIn satellite television: The difference between picture and sound carrier is ____.
QUARTZ ____ Crystal
LOG PERIODICA type of antenna that is useful as a multiband HF receiving antenna
COAXIAL WAVE OSCILLATOR
STRIPLINE It is a transmission system that uses two ground planes
FREQUENCY STABILITY
AND GATEIn order to separate channels in a TDM receiver, it is necessary to use what gate?
EXPOSURE Measures light flux incident or refracted by the scene.
COUPLING MISMATCH Modal dispersion has nothing to do with ___
RESONANT FREQUENCY Cavity …. Resonant
STEP RECOVERY If high order frequency multiplication is required from a diode,
____ diode must be used.
NOISE Shannon – Hartley law refers to
LASER X band
NOISE
63.5 µS Total time in horizontal trace
DIFFERENT DIELECTRIC CONSTANT
Refraction occurs when medium has ____
HIGHEST MODULATING FREQUENCY
This signal determines the bandwidth of the transmitted signal
SATURATION Strong vivid
PHASE DISCRIMINATOR Cannot modulate SSB
2827 KHZ L600 bandwidth
PHYSICAL LAYER OSI layer for transmission of bits
RHOMBIC ANTENNA A nonresonant antenna
QFor a given average power, the peak output power of a ruby laser may be increased by using ____ spoiling.
FILTER SAW devices may be used as ____
PEAK, VALLEY POINTThe negative resistance in a tunnel diode is available between the ____ and the ____
H3E Number and letter designation of carrier and one sideband
1.6 GBPS Firewire data rate
FREQUENCYAbsorption in radio waves in the atmosphere is dependent in ____
RGB Primary colors in chrominance in color TV
B8E
1.5 µS 20 pixel
63.5 µS Horizontal scanning time
SPLATTER Excess sideband
16:9 HSTV aspect ratio
AM SSB classified as
14 KBPS GPRS uplink rate
SQUELCH CIRCUIT Cannot function without ____ carrier
DIFFERENT REFRACTIVE INDEX
SATURATION Vivid and strong color
525 Raster scanning line
MARCONI ANTENNA Grounded
D LAYER Present at Daytime
DIODE Second am detector
YELLOW Most luminance
VHF Line of sight
HORN An antenna that is best excited from a waveguide
PEAK AND VALLEY POINTS negative resistance in a tunnel diode is available between
BANDPASS FILTER Use in separating channels in FDM
G/T Quality of space link is measured in terms of ____ ratio
63.5 µSAccording to NTSC, what is the time required to scan one horizontal line in TV?
PHASE DISCRIMINATOR A circuit that could not demodulate SSB
TUNERIn a TV receiver set, both audio and video signal are weak and distorted, the problem is mostly in the ____
CHROMA DETECTORA vectogram is useful because at a glance you can detect wether the ____ is normal
800A light wave is 800 angstrom long. What is the wavelength in nanometer?
ACQUISITION The time when FET is “on”, it is called ____
GG Superband on catv
UHF Tropospheric scatter
FILTERS SAW devices
56KBPS v.90
75Ω Coax cable
INTERNATIONAL VIDEO CONFERENCING
H.26L
RESONANCE Klystron and magnetron operating frequency is determined by
EFFICIENCY Difference between TRAPATT and IMPATT
15735 Horizontal sync / blanking pulse rate
FSK Modulation use in telegraphy
DIVX Radio format that uses mpeg4 video compression
RHOMBIC Consist of non-resonant antenna
CFA (CRITICAL FREQUENCY AMPLIFIER)
Amplifier wherein, axial: electric field and domain: magnetic field
STRIPLINESFlat strip of metal which is sandwhiched between two parallel ground planes
FREQUENCY STABILITYTunnel diode are connected loosely to its cavity to increase ____
AND GATE Necessary in TDMA receivers
FANTASY 94kHz scrambler plus video signal
EYE AND SKIN Parts of the body most sensitive
QPSK (DSSS) Mod used for IS-95
KOCHThe resistance of a photocell when light is incident on the active surface of the tube
LOG PERIODIC Very useful as multiband HF receiving antenna
AWG #19 What is the commonly used telephone wire?
648X480 PIXELS 480
1
ANTENNA ARRAY
ROOM TEMPERATURE
CHROMA AMPLIFIERIf TV has weak color signal, the most likely problem is the ____
FLICKERING Caused by difference in frame per second
PREVENT MODE JUMPING The cavity magnetron uses strapping to ___
HALF DUPLEX Speaker phones operates in ___ mode
AT BOTH SIDES Asynchronous data transmission requires a clock
CAPTURE EFFECT Ability of a tuner to restrict a weaker signal
Tip – M
a communications protocol that transmits one byte of information at a time at irregular time intervals ASYNCHRONOUS PROTOCOLRF radiation damage to cells of reproductive tissues GENETICSa method of comparing digital video and analog video resolution KELL FACTORV.90 data rate 56Kbpsbluetooth data rate 72KbpsAM detector rectification and ______ FILTERINGlamda/2, in 150MHz is in use in whatLength? 1mIn TV, blurring of the verticals in a reproductive image. SMEARINGMost widely used light generator in fiber optic system. INJECTION LASER DIODE(ILD)What is commonly used telephone wire? AWG #19What room where boundaries absorb effectively all incident sounds? ANECHOIC ROOMWhich of the following is the most reliable measurement for comparing amplifier noise characteristics? NOISE FACTORBIT RATE OF GPRS 172.22 kbpsVoice Over IP (VOIP)where the two-way transmission of audio is done over a packet-switched IP network (TCP/IP network) uses User Datagram ProtocolVoIP reseller P1 MillionVoIP service provider P5 Million
Two way transmission such as voip Conversational
MP3 means
Motion Pictures Experts Group Audio Layer 3, [ MPEG Audio Layer 3 (3-minute song, 3 MB)]
What is the advantage of low level modulation
An advantage of low level modulation is that less modulating signal power is required to achieve a high percentage of modulation.
480 pixel format 640 x 480 pixel progressiveA very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors DichroicEffect is described (usually as an undesired phenomena) in audio engineering when speech is time compressed, rate controlled, or accelerated. Donald Duck speechLaser used for Playback VLPWhat Does T means in 10 Base-T Type of medium usedTypical Wire Guage used in Telephone AWG#19Mode used for IS-95 CDMA QPSK (DSSS)Infrared does not fall in ____ range VisibleHalf wavelength operated at 150 Mhz is 1 Meter802.15 Bluetooth , 72 KbpsIS-95 CDMA 1.23Mbps10 Base-T Twisted Pairbandwidth of cellular CDMA system 1.23MHztype of receiver that is most commonly used in a conventional telephone set electromagneticKlystron resonant frequencywhat is the component in the telephone set that has the primary function of compensating for the local loop length varistorsingle frequency light is called monochromaticmost fiber optic light sources emit light in which spectrum visibleterm used for radiation damage cell GENETICdiffraction may occur at edge of sharp obstacles
the brightness of light source is called luminous intensity, what is its unit? candelawhat exchange is used to connect between central offices when direct trunk is not available tandemhow many unique tones are used for the 12-key dual tonbe multifrequency keypad
7
EST coaching September 10, 2012 TIP-QC 50-92
ANSWERS Questions:Absorption coefficient The ratio between the energy absorbed by a surface to the total
energy received by the surface
Huffman code A source code whose average word length approaches the fundamental limit set by the entropy of a discrete memory less source.
UHF what frequency band is the channel 14?QPSK frequently used type of modulation in satellite communication?
Intrinsic A silicon crystal is an _______ of semiconductor if every atom in the crystal is a silicon atom
COMPRESSIBILITY The velocity of propagation of longitudinal wave dependent on the _______ of the medium.
REFLECTOMETER The device used to measure the standing wave ratio (SWR) of transmission line.
HIERARCHICAL NETWORK The typical network used by SNA topology.E-LAYER The layer used in high frequency daytime propagation.
BROADBAND NETWORK The network that has multi channel capacity. (keyword: multi...)Secondary In CRT, focusing beam can be achieved by varying ____ voltagegrid bias Intensity of the electron beam can be change by varying _____
voltagetrigger-sweep oscilloscope only a portion of the signal can be seen using ____ oscilloscope
Lissajous pattern pattern to determine frequency and phase of signalvertical amplifier term wide-band refers to the bandwidth of _____.
Midday Time where the E layer is most ionizedHall Effect The speed of the audio tape head is not affected
Rf Amplifier not common on a Super heterodyne Receiver
Pin diode High Frequency amSinging Out of control
2.2 Gamma of picture tube of tvRhythm Sound characteristic related to sonic time pattern3.58Mhz Chroma signal63.6 µs Time required for the horizontal scanning line
Diode detector Simplest detectorPink noise 1/f noise
Descriptive interface Mpeg7 multimedia content
Mpeg3 Motion pictures experts group 1, audio layer 3Dichroic Reflects one color and reject other25 pins Rs232c has how many pins
1897 Strowger switch640x480 480 pixel progressive formatOrange Longest wave length on the following, orange, green, violet, blueMpeg4 Video specification used for video compression
6.3v Heating voltage of tv picture tubeMidday E layer most ionized during
Hue Phase angle in tvContrast Hall amplitude of the signal
Brightness Average illuminationY, I & Q Output signal of the matrix in color TV
Negative transmission Carrier amplitude decrease for whitePin Diode components to produce AM in high frequencyFlyback Horizontal retrace on tv receiverYellow Color most luminance
Foster-seely, quadrature & pll Three most common type of demodulatorCapstan Tape speed control by
Gg Super band on CARV60-108mhzl Frequency of gg
Imaging Optical signal to electrical signalElectroluminescence Electrical signal to optical signal
Peak to peak ac voltage Oscillator is used to measureVaristor In telephone, it is used to compensate local loop length
QPSK(DSSS) Modulation for IS-95F2 Most dense in all ionized layer
Physical layer OSI layer used for transmission of bits
TUP-T
ANSWER KEYWORD
Residual FM Short-term frequency deviation
Fading Fluctuation of signal at the receiver
Edge of sharp obstruction Diffraction may occur at ___
0.4 – 0.8 Wavelength range of visible light in microns
Bipolar Coding … three layers
Elementary doublet antenna that has a length of 1/10 of the wavelength
Antennas transmission lines at very high frequencies tend to act like
___
SIDs Mogul-Dellinger
Dipole quarter wavelength antenna
Bay in itself a complete antenna
Session OSI layer for sending and reception
Quarter wavelength minimum antenna length
below 2MHz Marconi antenna operates at a frequency ___
Near field area covered by an antenna
Intensity level (dB) measure of intensity against a reference intensity
-85 dBm reference level for dBa
F7What is the least expensive connector that is widely used fo CATV, VCRs and TV sets
Lowest beamwidth glass fiber optics
Bezel video picture that has different proportion from TV screen
Halo dark or bright spot at the fluorescent screen of a TV/CRT
Munsella set of charts used in color TV to verify hue, brilliance and chroma
Character bit oriented; byte orieted; ___ oriented
TDMA space satellites
8 kbps bit rate of TDMA
93Ωload used for interfacing with an RG.62 for impedance matching
XMODEM checksum method of error detection
DivX video compression used by MPEG4
Radiant flux another term for optical density
CDMI another term for MPEG4
Motion Picture Experts Group 1, Audio Layer 3
Motion Picture Experts Group 1, Audio Layer 3
Lost calls of 5% in communications, a P of 0.05
Square wave odd harmonics
Nut cost of radio or TV
Fishbowl area for VIP and sponsors
Supertrunk carries several video channels between TV facilities
Koch resistance of photocell
Panning movement of camera from one part of a scene o another
AWG#19 commonly used telephone wire
Donald Duck effect due to speeding without modifying the audio pitch
1200 bps bit rate for V.22
9.6 kbps bit rate for V.32
33.6 kbps bit rate for V.34
56 kbps bit rate for V.90
V.27 4.8 kbps bit rate
H3E carrier and one sideband
75 kbps bluetooth
Log periodic used as receiver
WiMaxlaunched in Aprl 2002… Broadband Wireless Access (BWA)
Conical horn antenna most efficient? antenna when connected to a waveguide
Noise immunity advantage of digital signals over analog
7 feetIt is a rule of thumb that a person watching a 31 inch TV should sit at a distance ___ feet from the screen
63.556 us horizontal line trace
10.2 us horizontal line retrace
10 pulses/second pulse dialing rate
15,734 Hz frequency for horizontal line trace
Star PBX config
800 THz frequency for optical fiber optics
10 - 30 kms maximum distance of fiber optics without repeaters
TwiceA mobile station sends a report to the BSC, ___ every minute.
Physical layer layer for transmission of bits
8-VSB for digital
Transverseelectromagnetic polarization is due to the ____ nature of the waves
ConverterWhat divides data characters to share facilities usually at slower data rates?
F-connector most popular plug for RG.59u coaxial cable
Matrix What do you call the combining circuit used in TV?
Heterodyning What is the process required for product detection?
50,000 MHzHigh frequency range of optical signal amplifier is 300 - _____ MHz.
Beamwidthseparation between the half-power radiation points of an antenna
Kell factora figure used when deriving the horizontal resolution for a television picture
University of the Philippines - Diliman
greater bandwidth Traveling wave parametric amplifiers are used to provide a ____.
transverse magneticWhen a particular mode is excited in a waveguide, there appears an extra electric component, in the direction of propagation. The resulting mode is _____.
envelope delayA type of distortion that takes place during transmission when a phase shift fails to maintain its constancy over the frequency range.
1394Firewire, originally developed by Apple Computers, is designated as IEEE _____.
H.324A videoconferencing standard using the Public Telephone Switching Network.
Threshold
The point at which the input signal power is just strong enough to enable the receiver demodulator circuitry successfully to detect and recover a good quality television picture from the incoming video carrier is the FM ____.
Illuminant C
Acoustic feedbacka special kind of positive feedback which occurs when a sound loop exists between an audio input ( microphone) and an audio output (speaker).
Narrow Tunnel diode has a ____ junctionelectroluminescence Conversion of electrical energy to light energy
F connector Used when connecting coaxial cable to equipmentflickering effect Caused by difference in frame rate
FootlambertUnit of luminance; Used in the industry for measuring the luminance of images on a projection screen
H CATV midband channelJ CATV superband channel
Acoustic HolographyUsing a single-frequency sound wave to produce a 3D image of an object. It is usually viewed on a CRT display
Slow-scan TVdeveloped by radio amateurs in order to transfer still pictures within a narrow bandwidth. It requires very slow scanning of the still pictures.
"rainbow"A signal generator generates a signal switch, which when fed into a color TV set, produces the entire color spectrum on the screen, with the colors merging together called
high audio Pre-emphasis amplifier boosts _____Amplitude variations
A-BTo compare audio or picture quality of two different sources, one is played first and then the other. This is called ____test
Sweep voltage
anti-tinkle_____circuit prevents dial pulsing from ringing the bell.
Transmission line Mismatch in refractive index is analogous to impedance mismatch
in ________
Induction coil______ is a component in the telephone set that has the primary function of interfacing the handset to the local loop
Chroma subcarrierWhat type of subcarrier signal for colored tv that has a frequency of 3.58 MHz?
Writing Speed6MHz The Bandwidth for US TVDTV ATSC and DVB-T are different standards for:
Varistor Used to suppress line voltage surgesPicture subcarrier 1.25 MHz.
1 local exchange carriers belongs to class ____.Crosstalk undesired effect in another channel?
USLT
An idle channel in the IMTS system is one unused channel that:
ALL MOBILE UNITS MONITOR FOR THEIR ADDRESS
DTMF dialing takes ___ … LESS
The anti-tinkle circuit prevents dial pulsing from ___.RINGING THE BELL
A type of spherical aberration in which light rays from a single point of an object do not converge at the corresponding point in the image.
ASTIGMATISM
A type of feedback determined by the balancing network and permits the talker to hear his/her own voice.
SIDETONE
The equipment used by the telephone network changes slowly to balance new technology against ___.
COSTWhich office class is the local central office? 5
What component in the telephone set has the primary functions of compensating for the local loop length?
VARISTORWhat type of receiver is most commonly used in a conventional telephone handset?
ELECTROMAGNETIC
Which component in the telephone set has the primary function of interfacing the handset to the local loop?
INDUCTION COIL
The function of diode rectifier bridge in the line circuit is to protect the set against ___ on the line.
POLARITY REVERSALS
__ is 3.58 MHz subcarrier signal for color in televisionCHROMA SIGNAL
A 35-mm frame of film that measures 36 x 24 mm has an aspect ration of ___ 3:02
Protocols may be ___ oriented.
BIT ORIENTED, BYTE ORIENTED AND CHARACTER ORIENTED
Semiconductor crosspoint switching arrays use __ devices that will remain latched in the conducting state. PNPN
What does a microprocessor require in order to work with a telephone circuit?ROM AND RAM
What is an advantage of electronic ringers? SMALLER SIZE
A device in a TV camera tube to reduce or eliminate streaks, called comets.ANTI-COMET TAIL GUN
How many different tones may be produced by a four-column DTMF keypad? 16
The MC34114 is primarily designed to work with a __ microphone.HIGH-IMPEDANCE ELECTRET
In negative transmission, what is the relative amplitude of the modulated picture carrier wave for the tip of sync?
100%
The maximum deviation of the FM sound signal, in kilohertz, is25
The difference between the sound carrier and the color subcarrier frequencies is.92 MHz
What is needed because of transients from lightning, induction or short circuits?OVERLOAD PROTECTION
A booth in a TV studio for observers, such as sponsors and VIPs.Fish bowl
What determines the minimum operating current in the local loop?carbon transmitter
An erroneous lower frequency obtained when a periodic signal is sampled at a rate equal or less than twice the signal’s frequency.
ALIASING
What type of transmitter has been replaced by the use of microphones in many modern telephones?
CARBONThe nominal value of the dial pulse break interval in milliseconds in the United States is 60msTime division multiplexing is ___ transmission DIGITAL
A switch invented by Strowger, that generates much noise and cannot operate directly from DTMF tones
STEP-BY-STEP
The voice frequency channel passband is ___ Hz0 - 4000
The parameter that most affects transmission of high speed modem data is ____PHASE DISTORTION
Electronic crosspoint arrays require a ___ to stay latched
MINIMUM HOLDING CURRENT
Ground start is ___ signaling that is instantaneousEITHER-WAY
Asynchronous transmission has low-speed transmission of less than ___ kbps2.4
The most popular plug for RG59U coaxial cable is theF CONNECTOR
coaxial cable for distribution systems has an impedance 75 OHMS
The most common US standard for interfacing between digital terminal equipment and modems is ____
EIA RS-232CData sent by D1 channel bank are at __ Mbps 1.544
One section in a D1 channel band handles ___ voice channels24
SLIC stands forSUBSCRIBER LINE INERFACE CARD
The average level of the luminance within an active picture. Usually expressed as a percentage of reference white level
AVERAGE PICTURE LEVEL (APL)
High speed transmission systems for carrying data over twisted copper pairs are known as ___ systems
DIGITAL SUBSCRIBER LINE (DSL)
Asynchronous multiplexed systems are used mostly for ___DATA TRANSMISSION
The parameter describing the degree of signal compression by the companders in the US network is
µThe portion of the geosynchronous orbit that provides optimum coverage of country
ARC OF GOOD LOCATION
he area of the analog video waveform between the end of horizontal sync and the start of active video in NTSC and PAL video signals, this part is largely occupied by the color burst BACK PORCH
The equation fs=2BW is called the ___NYQUIST CRITERION
Pulse dialing occurs at a rate of ___ pulses per second10
Speakerphones operates in ___ mode HALF-DUPLEX
What bad electrical effect happens when the switch hook is opened?A HIGH VOLTAGE TRANSIENT IS GENERATED
ADU
Answer KeywordFSK modulation scheme use in radio telegraphy1000 Hz tone phon is a unit of (test tone)No sideband produce if no signal/power transmittedElectroluminescent direct convert electrical to light
Long duty cycle TWT is same as magnetron because TWT has
TDM interlace pulse of transmitting different
VHF frequency range in LOS propagationBuffer in radio Tx, it isolates the oscillator from load
Diatonic an acoustical scale that has equal constant interval
0.02-0.2 micro volt metal film resistor, has typical flicker voltage ofBandwidth number repeats in a cable system depends on the _____ of the systemCDMA in satellite communications, frequency hopping is based on ______
Step recovery diode high frequency multiplies, uses mixer diodes
Better image rejection what is the benefit of high IF
First 3 digit determines the central office that the number is coming fromProximity effect distance… distance.. etc…
Induction coil – component ng telephone na ang primary function is interface the handset to local loop
FDMA access method used with standard analog mobile technology AMPSFDMA – used by most 1G systemsGSM 2G
QPSK digital amps- mobile technologyVoice – PSTN transport ______E-1 standard Europe
R Interfacing specifications covering pre-ISDN standards for basic rate access in an ISDN environment is the ____ interface
wider BW amplification Main adavantage of TWT over klystron
Line of sight frequency range high frequency (HF)Perceptible repition of sound echoAudio hologram used to estimate the sound field near a sourceelectromagnetic receiver used in conventional telephone handset300- 50000 Mhz. CATV amplifier high frequency