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