communication and electronics 1

7/29/2019 Communication and Electronics 1

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produces a carrier for SSB and CW that is mixed in the demodulator toproduce the audio signal

beat frequency oscillator (BFO)

class of amplifier that produces the least harmonic Class A

number of customer/ subscriber in 2G per cell 3000-20000

circuit that convert two-wire line to four wire line hybrid transformer

dot in body-end-dot multiplier

relation of gain and collector current directly proportional

also known as flicker noise pink noise

110% increase in normal voltage for a short period of time surge

rbe stands for roentgen biological equipment

what is a graphical transmission line calculator smith chart

a tube that emits electron when the cathode is illuminated phototube

combination of parabolic reflector and feed horn antenna hog horn

resistor with typical flicker voltage of 0.01-0.2 microvolt wire-wound

filter that use acoustic wave at the surface of the substrate to producedesired signal

surface acoustic wave (SAW)

what is the difference between wireless bridge and a wireless hub the wireless bridge has more poweroutput

in battery/cell, the type of cell which has the largest diameter D

types of cell that has the same electrolytesilver cadmium, silver zinc, nickelcadmium

have 3 op-amps, 7 resistors including a gain setting resistor basic instrumentation amplifier

ideal output voltage of an op-amp when 0 voltage is applied to its input 0 volts

equivalent of the cathode in a cell zinc container

brain of the computer CPU

common IC packages TO, flat pack, dual in-line

standard diameter of WORM (write only read many) disk 12 cmmaximum modulating frequency for FM 16kHz

minimum modulating frequency for FM 20 Hz

a video amplifier can amplify a frequency of ___ 10Hz-6MHz

temperature coeffecient of resistance of silver 0.0038

to avoid accidental flag bit stuffing

frequency of magnetron that is used in a microwave oven 2.45 GHz

welding process in a vacuum electron beam welding

coaxial cable used in older ethernet RG 58/u

maximum length of RS232C 50ft.

series of logic and arithmetic program leap frog

type of microphone used in telephone button microphone

deadlock series thrashing

another term for super refraction ducting

why tropospheric ducting is not frequently used it is not reliable

the physical height of an antenna is __ of its effective height 1/2 to 2/3

effeciency of parabolic antenna 55%

UCT universal coordinate time

a filter that can be connected between CB and antenna low pass filter

input impedance of common collector is __ high

which cannot be measured by only one instrument impedance


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applying 2 to 5 kV between the anode and cathode cathode spluttering

dirt in generator may causeflashovers and unstable voltageregulation

the color carrier is found __ lower than the audio carrier 4.5

because in line with this. Elastic of proton by compton effect

what is used to measure the specific gravity of battery electrode hydrometer

the science of combination of electrical, mechanical, and magnetic electrodynamics

an instrument used to measure the potential difference, electron charge electrometer

loudness of clock ticking 20 phons

what is the value of the load factor for a transformer to have negativevoltage regulation

zero

what materials are commonly used as substrate glass and ceramic

which is not a system requirement for 3G cellular IMT-2000

frequency used to signal handoff between cell in cellular 10kHz

known as the Ecommerce act of the Philippines RA8792

feedback element of an integrating op-amp load capacitor

infinite input impedance, zero output impedance is a characterisitc ofwhich amplifier

op-amp

principal musical interval considered as dissonant 7:8

an amplifier where the output signal voltage is larger than the inpust signalvoltage

voltage amplifier

why is there a need for a no-load test for transformerto determine magnetizing current andloss

to determine the relative frequency of the windings of the transformer by phasing out

instrument used to measure the degree of misalignment for a shaft dial indicator

what is the function of the summing amplifierit multiplies the input signal voltage tothe gain of the circuit

type of op-amp that is industry standard LM 341C

percentage modulation needed in neutralizing an operating transmitter 100% or more

what is the hydrometer reading of a fully charged lead acid battery slightly less than 1.3

what is the effect on the resonant frequency of a monopole antenna if aninductor is connected at the base

resonant frequency decreases

what is a small card that has embedded IC in itthat can storeinformation

smart card

what is a volatile memory RAM

for navigation, as well as marine and aeronautical communication andradar, what band is used

L

what is the primary frequency range of long distance skywave propagation 3 to 30MHZ

how long does transmit after for mobile drop outs 1 to 5 sec

what is the peak wavelength of sunlight 500nm

digital microwave system uses what modulation PSK or QAM

analog microwave system uses what type of modulation FM or SSB

what band of frequency is allocated for cable tv relay service 12.17 to 13.20 MHz

what do you call the wave of frequency directly above 300GHz millimeter wave

what system widely uses accelerometer navigation system

subatomic particle that has electrons, mu particle, and neutrino leptons

what is a filter that uses acoustic waves on the surface of a substrate toachieve the desired response

surface acoustic wave (SAW) filter

what is an amplifier w/ 2 inputs and 2 outputs where output is dependenton the difference of two inputs

differential amplifier

what type of coupling is used to produce low interference to frequency direct coupling


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response

a class A amplifier has a conduction angle of __ 360 degrees

a class C amplifier has a conduction angle of less than__ 180 degrees

if line impedance is equal to the load impedance there is no standing wave

symbols produced by 16 QAM 16

number of channel produced by baseband bus topology LAN 1

what is used for television to produce special effects and productionswitching

SEG

what is the promary use of fiber optics long distance telephone system

disadvantage of plastic fiber optics high attenuation

what is the frequency of the middle C 262Hz

what is the frequency of the first octave of the middle C 524Hz

advantage of plastic fiber optic inexpensive and flexible

in satellite communication, what determines the EIRPsattelite antenna, height and receiversensitivity

what is an amplifier that directly couple optical signal without converting itinto electrical form optical amplifier

what protocol is packet switching X.25

what is introduced to eliminate "singing" via net loss (VNL)

what is the other name for eddy current Foucault current

what type of circuit is this XR-2280 operational multiplier

bandwidth of op-amp with negative feedback wider

bandwidth of op-amp without negative feedback narrower because of high gain

a robot hand is called end effector

a robot arm is called end manipulator

an op-amp that is ultra precession CP-77A

what is the disadvantage of using double receivers instead of twoindividual receivers

when one receiver goes bad, the entirereceiver will also be bad

why is the differential amplifier better than regular amplifierbecause differential gives moreaccurate output than the regularamplifier

what is the nominal open circuit voltage of lead acid battery 2.1V

what is the reading in lead acid voltage when fully charged 2.2V

the lowest level of the OSI protocol, dealing with matters such as voltagesand current levels

physical layer

the third layer of the OSI protocol network layer

what is a plug-in circuit board for a computer that contains the necessaryhardware and firmware to connect the computer to a local area network

network interface card (NIC)

method in manufacturing IC in which the elements do not penetrate thesubstrate

epitaxial method

thin ethernet is also known as cheapernet

in SDLC and HDLC, what is the bit sequence that consist the flag 1111110

the public key is used to encrypt the message. A __ is required to decipherit

private key

the 10BaseT ethernet is restricted to a length of__ 100m

what protocol is common for bus networks CSMA/CD protocol

what is a typical velocity factor for coaxial cable 0.66

what is a typical velocity factor for twin lead 0.8


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what is a typical velocity factor for open wire line 0.9

the velocity factor of transmission lines varies from___ 0.5 to 0.9

used to indicate the capability of computer to handle data informatics

two freedom of axis gimbal

what is the nominal flasher rate of a flasher lead three times a second

ways to prevent polarization in a batteryvent a cell, add a material rich inoxygen, add a material that will absorbhydrogen

what do you call the movement of free electron in a semiconductormaterial

control current

what are the advantages of tape catridge over open reel and cassettebroadcasting

easily plugged, checked and stored

refers to the use of radi frequency field to produce deep heating in bodytissue

diathermy

a complete master oscillator or power amplifier system contained by asingle evacuated envelope

monofler

the practical application of current drawn from bodies of animals including

human to power electronic devices and appliancesbioelectrogenesis

ratio of width to height of a television picture aspect ratio

the portion of the horizontal blanking pulse before the sync pulse front porch

the portion of the horizontal blanking pulse after the sync pulse back porch

what would be the reliable range for mobile-mobile 1 to 10 miles

telephone channel is designed to carry voice signal with __ bandwidth 4000kHz

what effect for satellite system to rotate keeps their beam in onedirection

gyroscopic or flywheel effect

silicon solar cell photovoltaic cell

why are geostationary satellites not ideal for long distance telephony because of time delays involved

what is meant by CPE customer premises equipment

what is the loudness level of 80 phons compared to 60 phons 4 times louder

a weld bead of wineglass design is produced in ___ welding plasma-arc

what is the percentage of stray losses in DC machines 1%

why is that n-channel FET is superior to p-channel FETbecause mobility of electron is greaterthan hole

what is the coupling of the primary and secondary winding in transformer tight magnetic coupling

what is the typical resistence of voice coils for speaker used 4 to 100 ohms

what crystalline structure has packing factor of 0.52 simple cubic

what crystalline has a coordination facotr of 8 body-centered cubic

what is the transfer speed of firewire 400Mbps

what percentage of current in NPN transistor configuration reaches thecollector

98%

what percentage of current in transistor passes through the collector 95%

the FCC released an order of phasing out of analog broadcasting in ___ 2006

what is the IEEE standard for ZIGBEE IEEE 802.15.4

what is the IEEE standard for WiMax IEEE 802.16

what is the standard used for high speed ethernet system known as Wi-Fi IEEE 802.11b

what is the standard used for bluetooth IEEE 802.15

what is the bandwidth of bluetooth 720kbps

what is the bandwidth of wi-fi 11 to 54 kbps

what material has the highest absorption coefficient celotex

what material is suitable for sound insulation heavy materials

what is the typical turns ratio of a step-up transformer less than unity


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what is the typical turns ratio of a step-down transformer greater than unity

what is the maximum data rate in 3G for mobile users in high speedvehicles

144kbps

what is the maximum data rate in 3G for pedestrian for slow movingvehicles

384kbps

in 3G, what would be the maximum data rate for stationary mobile users 2Mbps

a scheme where several channels are interleaved and transmitted is called__

time division multiplexing

what is the typical gain for a rhombic antenna between 15-60 dB

the creation of the information technology council EO 469

what does EDGE mean enhanced data for global evolution

what is the typical value of input resistance of an op-amp 50 ohms

what is the unit of magnetic flux webber

considered as the hallmark of the TTL immunity to noise pulse

what term in Asynchronous Transfer Mode system is used to describe abyte

Octet

what magnet is commonly used in motor electromagnet

what is the rotating part of the motor rotor

what is the commonly used insulation for flexible cable polyvinyl chloridea ground base navigation system that has 88 to 98% global coverage omega

what is the speed of a geosynchronous satellite orbiting the earth innautical miles per hour

6879

what is the other term for mechanical amplifier low frequency power amplifier

the time required for the voltage level at the beginning of a pulse toincrease from 10% to 90% of tis maximum value

rise time

also known as the "lie detector test" polygraph

single circuit breaker device that combines the action of both thermal andmagnetic trip element

thermal magnetic trip element

high versatile and very common device for measuring AC voltage, positiveand negative voltage and DC resistance

digital multimeter

standard message that is used to test teletypewriter devices for the factthat it has all the alphanumeric fox message

what term is used to describe the speed of particles in a semiconductor..? mobility

the rate of NMOS is ___ compared to PMOS 4 times slower

which has the highest speed NMOS (choose PMOS if available)

wireless manufacturers set de facto standard for wireless communications wireless application protocol

what characteristic of solitons makes them interesting for long distancefiber optic transmission

can propogate very long distancewithout dispersion

the time required for the voltage level at the beginning of a pulse toincrease from 90% to 10% of tis maximum value

fall time

in GSM what telephone number that is unique to a given user worldwideinternational mobile subscriberidentification

a polygraph is used to measure the activity of the human body except the

___eye

what is the annual spectrum user fee (SUF) of paired 3G mobile phonetechnology for the first 5 MHZ

5 million per MHz

what is the annual spectrum user fee (SUF) of paired 3G mobile phonetechnology in excess of 5 not exceeding 10 MHZ bandwith

8 million per MHz

what is the annual spectrum user fee (SUF) of paired 3G mobile phonetechnology in excess of 10 not exceeding 15 MHZ bandwith

10 million per MHz

what is the annual spectrum user fee (SUF) of paired 3G mobile phonetechnology in excess of 15 MHZ bandwith

15 million per MHz

what is the annual spectrum user fee (SUF) of unpaired 3G mobilephone technology for the first 5 MHZ

3 million per MHz

what is the annual spectrum user fee (SUF) of unpaired 3G mobile 6 million per MHz


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phone technology in excess of 5 not exceeding 10 MHZ bandwith

what is the annual spectrum user fee (SUF) of unpaired 3G mobilephone technology in excess of 10 not exceeding 15 MHZ bandwith

8 million per MHz

what is the annual spectrum user fee (SUF) of unpaired 3G mobilephone technology in excess of 15 MHZ bandwith

12 million per MHz

what is the frequency deviation of cellular radio using FM +/- 12 kHz

what is the typical density of lithium type battery 90 A-hwhat is the typical density of LeClanche's dry type battery 30 A-h

effectivity of RA 9292 27-May-04

maximum location of light bulb down to the tip of the antenna tower 20 cm

bandwidth of firewire is __ times of USB 30

has no memory effect lithium

discrete code barcode 39 or code 3 of 9

name of honda robot asimo

name of hybrid car fuel cell car

inventor of magnetron randall and boot

world wide web is born 1991

coined the word "cyberspace" william gibson

what digital circuit is used as bit splitter shift register

a type of ac defect that occurs greater than one cycle blackout

a type of ac defect that occurs lesser than one cycle brownout

...like brown out but less in magnitude sag or dip

20000 volts transients

why do most long distance fiber communication system use wavelengthson the order of 1550nm

because the loss in glass fiber is lowestat a wavelength of approximately1550nm

what would be the most important advantage of converting the entiretelephone system, including the local loop to fiber optics

almost unlimited bandwidth

what cause light loss in fiber optics attenuation, scattering, dispersion

extra bits used to spread the signal in a direct sequence spread spectrum

system chipscircuit for digitizing voice at low data rate by using knowledge of the wayvoice sounds are produced

vocoder

what is the function of buffer amplifier amplification and isolation

a signal path provided by a cable TV system to relay subscriber terminalTV programs that are received off-the-air or are obtained by microwave ordirect connection to a tv broadcast station

class I cable tv channel

a signal path provided by a cable TV system to deliver to subscriberterminal signals that are intended for reception by equipment other than TVbroadcast receiver receiver only when not used with auxilliary equipment

class II cable tv channel

a signal path provided by a cable TV system to deliver to subscriberterminal signals that are intended for reception by equipment other than TVbroadcast receiver receiver only when used with auxilliary equipment

class III cable tv channel

a signal path provided by cable tv system to transmit signal of any type class IV cable tv channel

by pass capacitor is also known as __ decoupling capacitor

the fastest known supercomputer as of Nov 2005 IBM's Blue Gene/L

what is the speed of the fastest supercomputer 208.6TFLOPS

how many microprocessors in a chip does a supercomputer have 32786 microprocessor

who has been regarded as the father of supercomputer Seymour Roger Cray

given the award for the patent for the integrated circuit robert noyce

founder of INTEL robert noyce and gordon moore

who are the two unhappy engineers of fairchild who are nicknamed as"fairchildren"

robert noyce and gordon moore

what is the first microprocessor offered commercially INTEL 4004


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what is the codename for the next version of bluetooth lisbon

what is the codename for the next version of bluetooth after lisbon sheattle

what is the NTC memorandum circular # 07-08-2005rules and regulations for allocation of3G frequency band in the philippines

what is the NTC memorandum circular # 03-03-2005rules on the operation of broadcastmessaging service

what is the MC # 05-08-2005 voice over internet protocolwhat did the MC # 05-08-2005 definition regarding voip value added services

name of the humanoid robot made by honda asimo

what humanoid robot is designed by the korean institute of science andtechnology

hubo

what is the humanoid robot made for entertainment purposes Sony Qrio

what bridge is used to measure a circuit with medium Q Maxwell bridge

what bridge is used to measure a circuit with high Q hay bridge

which among the logic family has the fastest speed TTL (ECL if it is part of the choices)

what is the minimum distance between components in an advance chip 1 micrometer

applicants for the 3G operator must submit a ___ performance bond toNTC

300 million

capitalized fund for 3G applicant 100 millionwho coined the term "hypertext" ted nelson

who design the "mosaic" marc andersen

who designed the hypertext transfer protocol, HTTP tim berners lee

father of Arpanet larry roberts

who invented the mouse douglas englebart

designed the TCP- transmission control protocol vinton cerf and bob khan

who invented the ethernet metcalfe

what is the korean version of WiMax WiBro

founder of macintosh jeff raskin

invented nanotechnology norio tanaguchi

also known as the "Big Blue" IBM

father of IBM thomas watson Sr.

what frequency is reallocated to CMTS that is part of NRFAT 870-890MHz

who is the father of WiFI vic hayes

who first develops the graphical user interface xerox corporation

what is the first computer to use GUI lisa

what is the voltage of ULTOR for 35" color tv 30kV

the NTC defines the not to exceed___ 250mW

what is the latest technology in IC fabrication 65nm technology

what is the latest processor of INTEL 16Mb L3 cache 65nm Tulsa Processor

founder of apple steven waltznia and steve jobs

Given a 63.5s vertical retrace line, how many complete horizontal lines

are scanned in a vertical flyback?

10

When a ferrite is subjected to a magnetic field from a permanent magnet,the electrons spins experience what phenomenon?

Precession

What are the two types of network software? Peer to peer, client server

What do you find at the center of a star topology? A hub or a switch

What is used to fire a geosynchronous satellite to attain its final circulargeostationary orbit?

Apogee kick motor

What is the flicker nose voltage of a wirewound resistor? 0.01 V to 0.2V

What is the flicker noise voltage of a carbon composition? 0.1V to 2V

What camera tube uses lead oxide for the photoconductive? Plumbicon

What is the most common filter used in SSB? Mechanical filter

What radio transmission process where the message or video Frequency hopping


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communications are sent to the radio channels that changes frequencies ina pre-determined order?

What is the IMT-2000 maximum data rate for mobile user in a high speedvehicle?

144 kbps

A licensed and registered ECE can apply for professional ElectronicsEngineer if he registered how may years after the effectivity of RA 9292?

7 years

What is the signal sent y the network to the calling telephone in order toindicate theat the called telephone is ringing? Ringback tone

What is the advantage of optical fiber made up of plastic? Inexpensive and more flexible

ICT meansInformation and CommunicationTechnology

The maximum radiation from any electronic equipment should not exceed_______ mr per week?

100 mr

Depending on the terrain a microwave system uses line of sightpropagation and may require repeater approximately every ______

40 km

A type of card with embedded integrated circuit with functions that can beused in storing subscriber information in a PCS system

Smart card

What is the technique employed in networks to avoid accidental flags(adding bits)?

Bit stuffing

What law created the MTRCB P.D 1986What is another name for pink noise? Flicker noise

What is the frequency separation between the forward channel and thereverse channel in a cellular communication system?

45 MHz

What is the tone produced by a sound source other than the fundamentaltone?

Sidetone

What is the digital audio compression that substitutes MP3 audio? Dolby AC-3

In the operation and maintenance of cable TV system, you need a Duly registered ECE

What is the amount of sound attenuation offered by the wall, ceiling andfloor?

Transmission loss

What is the typical range of velocity factor in a coaxial cable? 0.6 to 0.8

What devices are inserted into a telephone channel if the total net loss ofthe trunk circuit exceeds about 2.5 dB?

Echo suppressors

The orbits of the GPS satellites are nearly circular with inclination angles of____ degrees relative to the equator

55 degrees

GPS satellite separation 60 degrees

Why is geostationary satellite not stationary for region near poles of theearth?

The angle of inclination is too low forthese regions

What is the maximum bit rate for fiber optic cable? 10 Gig per sec

Which modulation is the most noise resistant? PCM (pulse code modulation)

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

What is the center impedance of a half wave antenna? 73 ohms

What is the increase in the network capacity that can be achieved by 3Gwireless system?

70%

What is the major benefit of DSB and SSB? Higher power in the sidebands

How much is the fine of unauthorized servicing of mobile phones? 5000 Pesos per unit

Binary pattern of ones and zeros arranged in random? Pseudorandom code

If an audio signal is lost on a high frequency, what can be added to it toflatten the response?

Equalizer

A network using microwaves for two-way transmission of telephony,television, and high-speed data

Local Multipoint Distribution System(LMDS)

What is the speed of the geostationary satellite? 6879 statute miles per hour

What is the technique used in MPEG 2 compression? Discrete Cosine Transform

What refers to the ability of the FM receiver to receive the stronger of thetwo signals and ignoring the weaker one?

Capture effect

What is the primary advantage of microwave? Wide bandwidth availability


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What class of mobile phone whose maximum power output level isspecified as the ERP of 2dB watts? (1.6 Watts)

Class 2 or transportable phone

How many different symbols are possible outputs of a 16QAM modulator? 16

What refers to the reflection at the interface of two optical materials whichdepends on their refractive index and the angle in which light strikes theinterface

Frenzel reflection

What type of message in radio control channel in cellular systems tells aparticular mobile telephone that a call is to be received?

Pages

What is the modulation method used in European cordless telephone? GFSK

What do you call the calls which cannot be completed because the centraloffice or PBX switching capacity was full at the time the call wasattempted?

Blocked calls

What layer in the OSI is responsible for transmitting bits in thecommunications channel?

Physical layer

What is the ratio of the speed of light in air to the speed of light in anothermedium?

Index of refraction

The memory storage in cellular phones for the telephone number to beused are stored in what is known as

MPEG 1 (Motion Pictures ExpertsGroup)

What types of microphone produce low 2 outputs? Dynamic, ribbon, carbon

What is the speech coding rate of GSM for cellular system? 13 kbpsWhat is the bandwidth of GSM? 200 kHz

What formula is used in determining the overall noise performance of areceiver of multiple stages of RF amplification?

Friis formula

What is the lowest layer in the OSI model that deals with matters such asvoltage and current levels?

Physical layer

Brightness variations in color information are in what signal? Y (luminance)

What is the modulation and multiplexing technique that distribute signalsand its sidebands over a very wide bandwidth

Spread spectrum

What is the operating frequency of telephone quality analog voice signals? 300 Hz- 3 kHz

What scrambling method is used in compact disc digital audio system toensure that enough transitions between zeros and ones can take easilyclocking information?

8 to 14 modulation

What is the achievable data rate of 3G cellular system? More than 2 mbps

What is the maximum number of years of a certificate authority issued bythe NTC to the cable TV operator?

15 years

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

What order of the NTC which provides implementing guidelines on thegrant of mobile phone dealers permit? (MPDP)

Office Order 87-08-2004

What NTC memorandum circular provides additional rules and regulationson the purchase, sales, lease/rentals of mobile phones?

MC 08-08-2004

The electronic technician, as defined by MPSCT, implementationguidelines must be a graduate of an electronic technician course andshould have completed formal training in repairing, servicing, andmaintenance conducted by mobile phone manufacturer and/or training

center that are truly accredited ____

TESDA

Helical antenna is often used as a typical satellite tracking because of Faraday effect

What is the main disadvantage of fiber optic cable made of glass Brittleness

A comb filter is used to ________ To cancel chroma crosstalk

In tv, which controls the phase angle of demodulated color video signal Tint

In general typical range of frequency that troposcatter wave propagation isfound to be effective

350 MHz to 10 GHz

What modulation is used in Enhance Data rate for GSM Evolution (EDGE) 8PSK

Where should MBSCP or MDPD file their application? NTC regional office

If public key is used to encrypt the message, what is required to decipherit?

Private key

What do you call a card that comes with an 800/888 number that the card Pre-paid phone card


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owner dials to reach a network that allows him to dial anywhere he likes

Registered electronics engineer who is not a member of an accreditedprofessional organization must register within ____ years after theeffectivity of RA 9292?

3

What is IMT 2000 maximum data rate for pedestrian mobile users and forslow moving vehicles?

384 kbps

What is the basic component of a satellite? TransponderRefers to many major wireless manufacturer that have combined to createde facto standards in creating this content

Wireless application protocol

What is the frequency of the middle C 242 Hz

What is the frequency of 1 octave above middle C 542 Hz

Which of the following is not a porous absorber Membrane absorber

The time that a synthesizer remains at a frequency called Dwell time

To be a member of the board, an applicant should be in active practice ofelectronics engineering in how many years before promotion?

10 years

What is the maximum VF tone that may be fed to a voice signal +6dB

What is the maximum power of the Class 1 analog mobile phone 600mW

The average voltage value of the 3.58MHz modulated chrominance signal

in TV receivers is___________

The brightness of the color

How many lines does a standard NTSC has? 525

F3 emission means carrier frequency is modulated by _______ Voice

The aeronautical radio navigation land station that provides direct bearingon that station from an aircraft is known as _____________

Omni-directional range station

What is the frequency tolerance for aircraft station employing SSBtransmission?

20 ppm

The range of the human hearing can form how many octaves 10

What results in the luminance components interfering in the color signal, itoccurs whenever there is diagonal detail on that picture and gets worsewith motion

Cross luminance

How many horizontal lines are blanked out in the frame of TV receivers byV blanking

42

What would be the bandwidth of an AF filter for CW 500 to 1000 HzA superjumbo group has how many voice band channel 10800

A characteristic of the modulating signal that is proportional with theamount of frequency deviation from the carrier center frequency in FM

Amplitude

? requires that the amplitude of each sample be converted into ______ Binary number

In the single tube class C amplifier why is the ? modulated envelop thatmade up of varying amplitude dc pulses

Because of flywheel

What is the data transmission rate of the North American AMPS 10 kbps

The split pair is used by IBM token ring network that operates at either 4 or 16 Mbps

In acoustics, what do you call the present combination of interval Consonant interval

What is a system where cables and wires are placed within the ceiling andpoked up in the resistance floor structured to office or the room above

Poke probe

3G wireless system was introduced in what year 2001In telephone system, what traffic model is based on the assumption thatcalls are not immediately satisfied that the first attempt are held in thesystem until it is satisfied

Poisson

What is the maximum VF tone that may be fed in the telephone line 0 VU

What type of modulation is produced by sampling an analog signal PAM

What is the number of lines scan per frame in the raster on the picture tube 525

What is the velocity of the geostationary satellite in orbit 6879 statute mph

Which navigation does not have global range MLS

What refers to the system where an aircrafts navigation aid measures thetime interval between an interrogatory pulse and the reply from the radarfrom a radar beacon

DME (Distance Measuring Equipment)


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What is the accuracy of LORAN C long range hyberbolic radio navigationsystem

of a mile absolute & >100ft

What is the main advantage of GPRS It doesnt require a connection

How many TV fields are recorded on one slant track of tape 1

What frequency sharing technique uses highly directional spot beamantennas to prevent interference between stations of the same freq.

Spatial isolation

What is used to produce low power microwave oscillators Tunnel diodeWhat is the variation of the discriminator which greatly reduces sensitivityto amplitude variations and causes a 50% reduction in output voltage

Radio detector

Under the revised regulation governing cable TV systems in thePhilippines regular duplicated by the network programming by one or morestation in a week during the hours of 6 to 11 PM local time to a total of howmany hours or more?

14 hours

What is the minimum rejection of a CATV system 60 dB

In CATV system what is sound section isolation 40 dB

In CATV system what is the RF output terminal match 16 dB

In the NTSC regulation, how much is the fine for the MPSC operatingwithout valid NTC permit

Php5000

What is the term for the ratio for the luminous power to the radiant power inthe sample of light and expressed in lumens per watt of gradient energy

Luminosity

What do you call a special microwave coaxial cable which is made of hardtubing rather that wire with an insulating cover that can be used on thelower microwave band

Hard line

Which of the following are antennas made with micro strip on PCBs Patch antenna

Which coaxial connector is of more complex and expensive that do abetter job in maintaining the electrical char of the cable throughinterconnection

n-type connector

What is the dielectric constant of polyethylene insulator 2.27

How is tapped single button microphone cleared? Jarred

What helps protect fiber against degradation cause by moisture Cabling

For an angle of incidence = to the critical angle the light will be refracted Along the normal

How much more feed point Z does a folded dipole have than normal dipole 4 timesWhat filter may be connected between a CB transmitter and its antenna Low pass filter

When real time communication is required the only way to address thesecond fragment is to use a ____ containing more that 1 satellite

Constellation

What is the common usage of single button microphones In telephones

What is the advantage of using hub over direct interconnection to all theterminals

Its easy to move computers

A broadcast station is transmitting but not modulating, what is heard in areceiver tuned to its frequency

Nothing

A network using microwave for two way transmission of telephony and inhigh speed data

Local Multipoint Distribution System(LMDS)

In TV system, if the 3.58MHz C amp in the receiver does not operate, theresult will be __________?

No color

What refers to the emphasizing low level signals and compressing highlevel signals

Companding

A system that allows user to access documents from widely separatedsources of the internet using a common interface

WWW

What is the max efficiency of class C amp? 100%

What is the max recommended cable length of RS232C cable? 50 feet

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

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

What refers to the nonlinear effect that occurs at low power as low as 3mwin single mode fiber and takes the form of a light shifter slightly in freq fromthe original light wave

Bruilloin scattering


12/16

In wide area networks what routing technique requires each node to takethe incoming packet and retransmit it onto every outgoing line?

Flooding

For analog dram scanners what type of modulation is used after thereceive light has been converted into electrical energy?

FM

What is the most commonly used transmission line? Coax cable or line

In what 2 systems in the voice transmitter can speech processing be

used?

AF and RF

What can be determined about a transformer by an ohmmeter? Winding continuity, shorts to case andinterwinding shorts

Why is a matched line indistinguishable from an infinitely long line as seenfrom the source?

Since no energy is reflected from thematch load, so for the source it appearsas if energy is put into the linecontinuous to move down the lineforever

What type of circuit produces even order harmonics? Push-pull

What is the designation of SSB with full carrier? H3E

What is the achievable data rate of the 3G cellular system? More than 2Mbps

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

What packets switch data technique is used with the GSM systems? GPRS

What do you call the process by analog signal are transmitted byconverting them into a series of pulses whose amplitude is approximatelythe shape of the analog signal

PAM

In Ethernet LAN, what situation arises when two or more terminals try totransmit in the network at the same time?

Contention

What do you call the interval which its an integer or whole fraction ratio Octave interval

What is defined as the ratio of freq of two pure tones? Interval

What do you call the first note of the musical scale? Root note

In what year will the FCC face the analog broadcasting? 2006

Which of the following is or are parts of the network interface card? Both BNC and RJ49 connectors

Which of the ff wavelengths where absorption of electromagnetic wavesbecomes peak due to vibrational resonance in the water vapor molecule

1.35cm and 1.7mm

What class of mobile phone has a maximum power level specified as ERPof -2dBW or 600mW

Class III (mobile phone)

What refers to a series of tones that sounds good when used incombination

Musical scale

An MPD shop properly identifies its business and location by postingconspicuously at the entrance of its premises a sign board, what are thedimensions of the sign board?

50cm x 100cm

Electronic technician as defined by the MPSCP implementing guidelinesshould be a graduate of an electronic technician course and should havecompleted a formal training course in the repairs, servicing andmaintenance of mobile phones conducted by mobile phone manufacturersand or training service center duly accredited by _________

TESDA

Under RA 9292, one qualification to be a member of the board is being a

citizen and resident in the Philippines for at least how many years?

5 years

What technique is employed by the transmitter to avoid accidental flags Bit stuffing

If two signal are in quadrature, what tie the phase relation 90 degrees

What do you call a type of communications by propagation is primarily bythe direct or space wave which travels in straight line at freq above 30Mhz

LOS communication

What feature of SONET allows data spin with different paths to be sync Payload pointer

What is a specialized transformer that allows telephone voice signals totravel in both directions simultaneously in a single twisted pair loop

Hybrid coil

Cable TV companies collect signals and programs from many sources in afacility called ____________

Head end

Refers to the transmission of multiple TV signals which are freqmultiplexed on a single cable to be used in lieu of over the air signal trans

Cable TV


13/16

What is the other name of super refraction Ducting

What is the reason why tropospheric ducting not used very much inpractical communication systems?

Because it is not reliable

What is the function of a hybrid in the telephone handset Decrease mic signal in phones

When the called telephone is ringing, the CO sends a pulse AC voltage tothe calling telephone. What is that signal called?

Ringback signal

What unit refers to radiation other than x-rays which will have anabsorption equal to 1 roentgens

Rep - roentgen equivalent physical

Different sources of radiation have different effect which are related to x-rays by a number which is referred to as the ______

Rbe roentgen biological effectiveness

In TV, the picture information is transmitted on a separate carrier that islocated _____ lower in frequency that the sound carrier

4.5MHz

Which of the standards given below is a terrestrial digital TV transmission 8-VSB

What is the main accelerating element in the CRT ultor

What is the combined mixer and LO that uses 1 transistor of tube or both Antodyne converter

Lossless compression scheme generally look for redundancies in the datafor instance the string of zeroes can be replaced with a code that tells thereceivers the length of the string. What do you call this technique?

Run length encoding

Which ground based navigation system has a center freq of 108-118MHz VOR or DME

All colors on the color test signal are modulated at 75% except what color? Gray

In analog cellular system, the interfering signal strength remains approxless than ____ of desired signal strength to assure negligible interference

2%

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

The 10 base T Ethernet system is restricted only to ______ 100m

What code is used in 100 days Tx Ethernet standard? 3 level Manchester code

What is the carrier frequency of supergroup 10? 3100kHz

What frequency is used to signal handoffs to another cell and thetermination of the cell in cellular communications

10kHz

Which of the following principle musical intervals is considered desonant? 7:8

What is essentially a cell site shelter that is mounted on flat bed tractortrailer used for emergency purposes

COW

In cellular system what defines the geographic distance that is requiredbetween cells used in identical frequencies in order to avoid interferencebetween the radio transmissions of this cells?

Distance-to-reuse ratio (D/R)

RA 9292 was approved by Pres. Gloria Macapagal Arroyo on what date? April 17, 2004

Which of the following is considered the first instance of governmentregulation of radio technology?

Radio act of 1910

What do you call the random data send continuously by the NIC thatdisrupts the whole area network?

Jabber

What law regulates the operation of cable antenna system in the Phil? EO 205

Which of the following is the nearest star to the solar system? Proxima Centauri

What is the shifting of antenna pattern so that the major lobe is at an anglebelow the horizontal?

Down tilt

What allows one antenna to be used for reception and transmissionwithout mutual interference?

Duplexer

What is the term used to describe an ordinary voice telephony? POTS

What do you call the call that cannot be completed because of the centraloffice or PBX switching capacity is full at the time the call attempted?

Block call

Why does an FM antenna ammeter not change with modulation? No power added with modulation

What is meant by peak white? The video signal represents maxluminance

In color CRT, what refers to adjustment of the three electron beam so thateach lens can phosper dots on the appropriate color?

Purity

In a satellite system, what do you call the focus beam of energy thatcovers a relatively small area on the earth produced by high gain antennaon the satellite?

Spot beam


14/16

What radio system was developed to provide high speed packet dataaccess for the GSM network?

GPRS

How wide are the GSM channels? 200kHz

What type of radar is used for speed measurements such as the one usedby the police or the police radar?

CW Doppler radar

With what type of emission does this tuning by 200Hz materially degrade

the received signal?

J3E

Why does a high Q circuit discriminate against harmonics? Because of purer sine wave AC

What will you change in order that gain of transistor amplifier can vary? The collector current

What are 2 function of a buffer amplifier? Amplify and isolate

How much of the emission must be within the bandwidth of the transmitter 99%

What type of 2nd detector is used for SSB and CW Heterodyne

In FM broadcasting, what is the lowest used modulating frequency? 26Hz

What is the emission designation for VHF FM? F3E

Why does a higher impedance line have lower copper loss than a lowerimpedance line?

Because higher impedance line haslower current for a given power level

What is considered as the simplest transmitter keyed on and off to produceCW Morse code?

The oscillator

Occasionally rockets will contain more than one satellite, what do you callthe main satellite to be launched? Initial payload

What are the 2 basic types of radar? Pulse and CW

How many orbital plans which are equally spaced around the equator inGPS operational constellation?

6

What is the popular fiber optics cable with the glass core and plasticcladding called?

PCS (plastic clad silica)

What is a FM receiver that causes a stronger signal to dominate theweaker signal in the same frequency?

Capture effect

What is the advantage of using SSB suppressed carrier AM as themodulation scheme for FDM telephony?

It has the least bandwidth

What may cause ionic disturbance characterized by rapid cluttering soundhence voice communication is poor?

Aurora borealis

What is used to convert the scene or object nearest to view the electricalsignal which can be used to modulate the carrier?

Television camera

What is the advantage of toroid inductors over air core inductors? High permeability of the core

The mandatory 24 ship-to-shore communications from 1910-1912 wasestablished by the US, Great Britain and other maritime nation as thedirect result of the sinking of the 2 famous ships, which are?

The Republic and The Titanic

How much is the filling fee for application of MDSCP or MPDP Php180

The frequency tolerance of FM broadcast stations is _____ above or belowthe assigned frequency?

2000Hz

What layer of the OSI model handles the transmission of bites over acommunications channel?

Physical layer

What is the next to higher level of the multi-level activities ofcommunications which defines how the initial data is sent and transformed

into the symbols that represent it before being actually transmitted with thisspecific signal value?

Coding

Which of the ff. coaxial cable connectors is called the UHF connector? PL 259

What satellite subsystem monitors on board conditions such astemperature and battery voltage and transmits this data back to a groundstation for analysis?

TTC

What expresses the steepness of the skirts of the skirts selectivity of aradio receiver?

Shape factor

In SSB, the transmitter output is expressed in terms of _________? Peak envelop power

Which of the ff. is the policy guidelines to govern the operation of cable TVin the Philippines?

PO 436

What is the standard signal format of a numeric paging receiver? NEC B3 standard


15/16

What is the critical capacitance variation of most varactors used infrequency modulators?

12 to 1

Helical antennas are often used for satellite tracking VHF because of? Faradays effect

What traffic model is based on the assumption that calls not immediatelysatisfied at the first attempt are held in the system until satisfied?

Erlang C

What does ICT mean? Information and Communication

TechnologyWhat is the typical noise figure of metals, semiconductors, FET orMOSFET used at microwave frequency?

2 dB or less

What is the 3rd layer of the OSI protocol model which sets up the path totransmit data between terminals and modulation is used?

Baseband

What system specification for 3G wireless system uses as a wide rfchannel efficient coding and multiple channels to provide for both lowspeed circuit and high speed packet services?

WCDMA

If the antenna current increases 3.3 times how much is the field strengthincrease?

3.3 times

What is the term used to describe a computer operating system allowsmultiple program to run simultaneously without interfering with each other

Multi-tasking

What is the 1st type of modulation using an SB microphone called? Absorption or loop

What are used to allow fiber optics to operate at much higher data ratesand over longer distances with the use of range and resist abrasion?

Polyethylene

If the satellite is lunched at the speed exceeding 25000mph, the satellitewill not go in orbit and will break away from the gravitational pull of theearth and go out in deep space what do you call this satellite?

Space probe

What is used to improve the signal to noise ratio for either PCM or deltamodulation signals?

Companding

In a system, if the system to have a net gain there would be a possibility ofoscillation due to feedback from this reflection, what is this called?

Singing

What is the voltage of the local loop on hook? 48Vdc

In a propagation medium such in the glass of an optical fiber ____ is thescattering of an electromagnetic wave by particles with the size aboutequal or greater than the wavelength?

MIE scattering

What is the ratio of speed of light in air to the speed of light in anothermedium?

Index of refraction

What LED is usual signal source for plastic fiber? Red LED

Why is pulse code modulation preferred over PAM? Because of its superior noise immunity

What carrier shift results with insufficient grid excitation to a grid modulatedstage?

Positive

Why are printed circuit board such as stripline and microstrip implementedon transmission lines?

To create resonance circuits and filters

In satellite communication system, _______ is the satellite component thatsenses the time or the incidence angle of solar radiation and provideselectrical signal that may be used to compute the satellite orientation?

Sun sensor

A few centimeters long solid insulated hook-up wire that provides smallcapacitance to the ground that is adjusted during circuit alignment by

bending slightly in one direction or another, what do you call this wire?

Gimmick

What is the acronym GMDSS stand for? Global maritime distress and safetysystem

What is the main disadvantage of fiber optic cable made of glass? Brittleness

In TV system, the color level control is in the ______? BPA

The max. radiation for electronic equipment must not exceed ___ mr/week 100

What refers to any sonic, infrasonic, or ultrasonic wave which is emittedfrom electronic product as a result of the operation of its electronic circuit

Radiation

What is the formula for REM? Rbe x rad

Radiation exposure rates produced by a TV receiver shall not exceed ____milli roentgens per hour at the distance of 5cm from any point on externalsurface of the receiver?

0.5


16/16

Why are larger antennas receive stronger signals than smaller antenna? Because they have greater effectivearea or greater proportion of radiatedenergy intercepted

What is the advantage of Dougherty linear? High efficiency

What vacuum tube is used for microwave amplification and oscillation? Klystron

What is the advantage of using variable and balance T-type attenuator

pass as gain control?

Maintain small constant z

What refers to the sampling of analog signal used in a sample and holdcircuit such that the sample will have the same amplitude for its wholeduration

Flat top sampling

Which of the ff. identifies the maximum transmitted power level of a mobilephone?

Station class mark

Which of the ff. is not a supervisory tone? 4000Hz

If the distance between the sound source and the listener is changing, thefreq. heard will defer from the freq. emitted, this phenomenon is called?

Doppler effect

One document required for application of MPDP is a list of stock of spareparts and accessories sufficient enough to cover the warranty of mobilephone units for at least how many months?

6 months

How much is the inspection fee for application of MPDP or MPCP? Php720/year

Which NTC memorandum circular provides for the additional rules andregulations on the purchase, sale, lease and retail of mobile phones?

MC 08-08-2004

What protocol is used in the check sum method of error detection? X modem

In cellular system, typically how many cells in the freq. reuse plan format? 7

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