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EST Terms and Definitions

Apr 05, 2018

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    EST Terms and Definitions Part1

    SYNCHRONOUS DATA TRANSMISSION

    Uses the principle of handshaking

    BIT RATE OF V.22

    1200 kbps

    BIT RATE OF V.90

    56 kbps

    BIT RATE OF V.34

    33.6 kbps

    BIT RATE OF V.32

    9.6 kbps

    BIT RATE OF GPRS

    172.22 kbps

    IS-95 CDMA

    - bit rate of 1.23 Mbps

    BLUETOOTH

    - has data rate of 72 kbps

    - has ISM freq range of 2.402 2.480 Ghz

    802.11b

    IEEE standard for Wi Fi

    525 HORIZONTAL SCANNING LINES

    number of scanning lines in the raster of the picture

    tube for NTSC

    It takes 1.56 microseconds to scan 12.5 pixels

    It takes 0.125 microseconds to scan 1 pixel

    The interfering beat freq 920 Khz is b/w the 3.58

    Mhz chroma subcarrier and 4.5 Mhz sound carrier

    1. Extended superframe 576 channels

    2. Delta Modulation slope overload is common

    problem

    3. T1 most common carrier line for telephones

    4. 100 dB - RF and IF gain in receiver

    5. 0.9 velocity factor for open wire

    6. 0.8 velocity factor for twin lead

    7. Critical frequency of F2 8 MHz

    8. Ephemeris location of a celestial body in space

    9. troposcatter 350 MHz to 10 GHz

    10. End impedance of HW dipole 2500

    11. single hop night time range of F2 4130 km

    12. 3300 m/s speed of sound in wood

    13. GSM/TDMA cannot execute soft handoff because

    cellsites use different sets of frequencies to

    communicate with each other

    14. 20 phons typical loudness level of ticking watch

    15. M88 88 mH coil; every 9000 feet

    16. Hybrid Transformer 2 wire to 4 wire converter

    17. click square wave; rounding off something

    18. SDMA Spatial Div. Multi Access; use same

    frequency in multiple focused beams aim at different

    areas

    19. IS 95 became CDMA 2000

    20. International pitch A 435 Hz

    21. Hash 128 bits sequence in digital signature

    22. Envelope Delay Distortion caused by freq.

    dependent attenuation chars of transmission lines

    23. POP3 Post Office Protocol version 3

    24. Why use geosynchronous satellites? To simplify

    tracking requirements

    25. BISYNC not a bit oriented protocol

    26. flag filed for SDLC/HDC 7Eh

    27. Bit stuffing to prevent accidental flag fields?

    28. Blank and Burst interrupt voice feed to send

    control signals (cellular telephony)29. fiber optics are preferred to satellites for long

    distance telephone transmission because of less

    delay

    30. real time of info found in circuit switching

    31. mechanical splicing

    32. fusion splicing the ends are melted together

    33. 2 mV TV video signal level

    34. for CATV : (noise free picture)

    a. 1 mV for 75

    b. 2 mV for 300

    35. Synchronous demodulation process of getting the

    info from the chroma signal

    36. CW Doppler Radar used by police

    37. CTCS Continuous Tone Control Squelch; low

    frequency tones only

    38. EO 196 control of PHILCOM SAT to NTC

    39. P 5000 fine for no permit (MPDP)

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    40. P 5000 per unit fine of unauthorized cellphone

    service

    41. P 100 K paid up capital

    42. P 1200 permit for MPD

    43. P 300- license for CATV head end

    44. Differential Peak Detector has a peak detector

    45. Sun Detector orientation of sunlight

    46. Blooming trapped gas pockets in fiber cables

    47. Service numbers 3 digit number with specialized

    service

    48. smart card card with embedded IC

    49. armature part of dc radio gen which is grounded to

    reduce radio noise

    50. MPEG4 - current video compression standard

    51. 6 to 10 dB noticeable change in loudness level

    52. noise figure: (with equalizer)

    a. 330 MHz 9.5 dB

    b. 54 MHz 7.5 dB

    53. 12 dB visual signal level for channels that have

    other than 6MHz nominal separation

    54. 3 dB visual signal level for channels that have

    6MHz nominal separation

    55. 13 to 17 dB sound carrier lower than visual carrier

    56. Cross Luminance diagonal patterns

    57. S unit 6 dB

    58. MPDP apply at NTC regional office of area toservice

    59. 24.3 kBaud/sec modulation rate for D-AMPS

    60. 150 V receiver preampt input (CATV)

    61. SSB 200 Hz shift results in material degradation

    62. +- 25V max voltage to apply (data)

    63. GMDSS Global Maritime Distress and Safety

    System

    64. AMPS 10 kbps

    65. Positive Carrier Shift insufficient grid mod at grid

    modulation ckt

    66. Negative Carrier Shift insufficient grid mod at high

    power modulation

    67. 100 milliroentgents/week exposure

    68. 0.5 milliroentgents per hour from 5 cm

    69. camera pickup tube yellow green is most sensitive

    70. wan topologies:

    a. leased line

    b. circuit switching

    c. packet switching

    71.

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    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 communications are sent to the radio

    channels that changes frequencies in a pre-

    determined order? Frequency hopping

    What is the IMT-2000 maximum data rate for mobile

    user in a high speed vehicle? 144 kbps

    A licensed and registered ECE can apply for

    professional Electronics Engineer 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 to indicate theat the called

    telephone is ringing? Ringback tone

    What is the advantage of optical fiber made up of

    plastic? Inexpensive and more flexible

    ICT means Information and Communication

    Technology

    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 sight propagation and may require repeater

    approximately every ______40 km

    A type of card with embedded integrated circuit with

    functions that can be used 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 1986

    What is another name for pink noise? Flicker noise

    What is the frequency separation between the

    forward channel and the reverse channel in a cellular

    communication system? 45 MHz

    What is the tone produced by a sound source other

    than the fundamental tone?

    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 and floor? 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 of the trunk circuit exceeds about

    2.5 dB? Echo suppressors

    The orbits of the GPS satellites are nearly circular

    with inclination angles of ____ 55 degrees degrees

    relative to the equator

    GPS satellite separation 60 degrees

    Why is geostationary satellite not stationary for

    region near poles of the earth? The angle of

    inclination is too low for these 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 3G wireless 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 to flatten the response? Equalizer

    A network using microwaves for two-way

    transmission of telephony, television, and high-

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    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 the two signals and ignoring

    the weaker one? Capture effect

    What is the primary advantage of microwave? Wide

    bandwidth availability

    What class of mobile phone whose maximum power

    output level is specified 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 which depends on their refractive

    index and the angle in which light strikes the

    interface Frenzel reflection

    What type of message in radio control channel in

    cellular systems tells a particular 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 central office or PBX

    switching capacity was full at the time the call was

    attempted? Blocked calls

    What layer in the OSI is responsible for transmitting

    bits in the communications channel? Physical layer

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

    speed of light in another medium?

    Index of refraction

    The memory storage in cellular phones for the

    telephone number to be used are stored in what is

    known as MPEG 1 (Motion Pictures Experts Group)

    What types of microphone produce low 2 outputs?

    Dynamic, ribbon, carbon

    What is the speech coding rate of GSM for cellular

    system? 13 kbps

    What is the bandwidth of GSM? 200 kHz

    What formula is used in determining the overall

    noise performance of a receiver of multiple stages of

    RF amplification? Friis formula

    What is the lowest layer in the OSI model that deals

    with matters such as voltage 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 signals and 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 to ensure that enough

    transitions between zeros and ones can take easily

    clocking 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 by the 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 the grant of mobile phone dealers

    permit? (MPDP) Office Order 87-08-2004

    What NTC memorandum circular provides additional

    rules and regulations on the purchase, sales,

    lease/rentals of mobile phones? MC 08-08-2004

    The electronic technician, as defined by MPSCT,

    implementation guidelines must be a graduate of an

    electronic technician course and should have

    completed formal training in repairing, servicing, and

    maintenance 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 ofFaraday effect

    What is the main disadvantage of fiber optic cable

    made of glass Brittleness

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    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 is found 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 decipher it?

    Private key

    What do you call a card that comes with an

    800/888 number that the card owner dials to reach

    a network that allows him to dial anywhere he likes

    Pre-paid phone card

    Registered electronics engineer who is not a

    member of an accredited professional organization

    must register within ____ years after the effectivity

    of RA 9292? 3

    What is IMT 2000 maximum data rate for pedestrian

    mobile users and for slow moving vehicles? 384 kbps

    What is the basic component of a satellite?

    Transponder

    Refers to many major wireless manufacturer that

    have combined to create de 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 of electronics engineering in how

    many years before promotion? 10 years

    What layer of the OSI model handles the

    transmission of bites over a communications

    channel? Physical layer

    What is the next to higher level of the multi-level

    activities of communications which defines how the

    initial data is sent and transformed into the symbols

    that represent it before being actually transmitted

    with this specific 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 as temperature and battery voltage

    and transmits this data back to a ground station for

    analysis? TTC

    What expresses the steepness of the skirts of the

    skirts selectivity of a radio receiver? Shape factor

    In SSB, the transmitter output is expressed in terms

    of _________? power

    Which of the ff. is the policy guidelines to govern the

    operation of cable TV in thePhilippines? PO 436

    What is the standard signal format of a numeric

    paging receiver? NEC B3 standard

    What is the critical capacitance variation of most

    varactors used in frequency 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 immediately satisfied at the first attempt

    are held in the system until satisfied? Erlang C

    What does ICT mean? Information and

    Communication Technology

    What is the typical noise figure of metals,

    semiconductors, FET or MOSFET used at microwave

    frequency? 2 dB or less

    What is the 3rd

    layer of the OSI protocol model which

    sets up the path to transmit data between terminals

    and modulation is used? Baseband

    What system specification for 3G wireless system

    uses as a wide rf channel efficient coding and

    multiple channels to provide for both low speed

    circuit and high speed packet services? WCDMA

    If the antenna current increases 3.3 times how much

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    is the field strength increase? 3.3 times

    What is the term used to describe a computer

    operating system allows multiple 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 rates and over longer distances

    with the use of range and resist abrasion?

    Polyethylene

    If the satellite is lunched at the speed exceeding

    25000mph, the satellite will not go in orbit and will

    break away from the gravitational pull of the earth

    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 delta modulation signals?

    Companding

    In a system, if the system to have a net gain there

    would be a possibility of oscillation 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 the scattering of an

    electromagnetic wave by particles with the size

    about equal or greater than the wavelength? MIE

    scattering

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

    of light in another medium? 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 modulated stage? Positive

    Why are printed circuit board such as stripline and

    microstrip implemented on transmission lines? To

    create resonance circuits and filters

    In satellite communication system, _______ is the

    satellite component that senses the time or the

    incidence angle of solar radiation and provides

    electrical signal that may be used to compute the

    satellite orientation? Sun sensor

    A few centimeters long solid insulated hook-up wire

    that provides small capacitance 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 safety system

    What is the main disadvantage of fiber optic cable

    made of glass? Brittleness

    ANSWERS:

    Peak envelop

    What refers to a series of tones that sounds good

    when used in combination

    Musical scale

    An MPD shop properly identifies its business and

    location by posting conspicuously at the entrance of

    its premises a sign board, what are the dimensions

    of the sign board? 50cm x 100cm

    Electronic technician as defined by the MPSCP

    implementing guidelines should be a graduate of an

    electronic technician course and should have

    completed a formal training course in the repairs,

    servicing and maintenance of mobile phones

    conducted by mobile phone manufacturers and ortraining 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

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    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 by the 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 to travel in both directions

    simultaneously in a single twisted pair loop Hybrid

    coil

    Cable TV companies collect signals and programs

    from many sources in a facility called _ Head end

    Refers to the transmission of multiple TV signals

    which are freq multiplexed on a single cable to be

    used in lieu of over the air signal trans Cable TV

    What is the other name of super refraction

    Ducting

    What is the reason why tropospheric ducting not

    used very much in practical 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 to the calling telephone. What is

    that signal called? Ringback signal

    What unit refers to radiation other than x-rays which

    will have an absorption 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 is located _____ lower in

    frequency that the sound carrier4.5MHz

    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 data for instance the string of

    zeroes can be replaced with a code that tells the

    receivers 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 approx less 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 Manchestercode

    What is the carrier frequency of supergroup 10?

    3100kHz

    What frequency is used to signal handoffs to another

    cell and the termination of the cell in cellular

    communications10kHz

    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 tractor trailer used for emergency

    purposes COW

    In cellular system what defines the geographic

    distance that is required between cells used in

    identical frequencies in order to avoid interference

    between 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

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    instance of government regulation of radio

    technology? Radio act of 1910

    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 bearing on that station from an

    aircraft is known as ___Omni-directional range

    station

    What is the frequency tolerance for aircraft station

    employing SSB transmission? 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, it occurs whenever

    there is diagonal detail on that picture and gets

    worse with motion

    Cross luminance

    How many horizontal lines are blanked out in the

    frame of TV receivers by V blanking 42

    What would be the bandwidth of an AF filter for CW

    500 to 1000 Hz

    A superjumbo group has how many voice band

    channel 10800

    A characteristic of the modulating signal that is

    proportional with the amount 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 that made 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 and poked up in the resistance

    floor structured to office or the room above Poke

    probe

    3G wireless system was introduced in what year

    2001

    In telephone system, what traffic model is based on

    the assumption that calls are not immediately

    satisfied that the first attempt are held in the system

    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 the time interval between

    an interrogatory pulse and the reply from the radar

    from a radar beacon DME (Distance Measuring

    Equipment)

    What is the accuracy of LORAN C long range

    hyberbolic radio navigation system

    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 beam antennas to prevent

    interference between stations of the same freq.

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    Spatial isolation

    What is used to produce low power microwave

    oscillators Tunnel diode

    What is the variation of the discriminator which

    greatly reduces sensitivity to amplitude variations

    and causes a 50% reduction in output voltage Radio

    detector

    Under the revised regulation governing cable TV

    systems in the Philippines regular duplicated by the

    network programming by one or more station in a

    week during the hours of 6 to 11 PM local time to a

    total of how many 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 operating without valid NTC permit Php5000

    What is the term for the ratio for the luminous

    power to the radiant power in the 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 hard tubing rather that wire with

    an insulating cover that can be used on the lower

    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 a better job in maintaining the

    electrical char of the cable through interconnection

    n-type connector

    What is the dielectric constant of polyethylene

    insulator 2.27

    What do you call the random data send continuously

    by the NIC that disrupts 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 angle below the horizontal?

    Down tilt

    What allows one antenna to be used for reception

    and transmission without 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 central office 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 max luminance

    In color CRT, what refers to adjustment of the three

    electron beam so that each lens can phosper dots on

    the appropriate color? Purity

    In a satellite system, what do you call the focus

    beam of energy that covers a relatively small area on

    the earth produced by high gain antenna on the

    satellite? Spot beam

    What radio system was developed to provide high

    speed packet data access 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 used by 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

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    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 lower impedance line? Because

    higher impedance line has lower current for a given

    power level

    What is considered as the simplest transmitter

    keyed on and off to produce CW Morse code? The

    oscillator

    Occasionally rockets will contain more than one

    satellite, what do you call the 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 in GPS operational

    constellation? 6

    What is the popular fiber optics cable with the glass

    core and plastic cladding called? PCS (plastic clad

    silica)

    What is a FM receiver that causes a stronger signal

    to dominate the weaker signal in the same

    frequency? Capture effect

    What is the advantage of using SSB suppressed

    carrier AM as the modulation scheme for FDM

    telephony? It has the least bandwidth

    What may cause ionic disturbance characterized by

    rapid cluttering sound hence voice communication is

    poor? Aurora borealis

    What is used to convert the scene or object nearest

    to view the electrical signal 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 was established by the US, Great

    Britain and other maritime nation as the direct 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 below the assigned frequency?

    2000Hz

    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 times

    What 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 the second 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 the terminals Its easy to move

    computers

    A broadcast station is transmitting but not modulating,

    what is heard in a receiver tuned to its frequency

    Nothing

    A network using microwave for two way transmission

    of telephony and in high speed data

    Local MultipointDistribution System (LMDS)

    In TV system, if the 3.58MHz C amp in the receiver

    does not operate, the result will be __________? No

    color

    What refers to the emphasizing low level signals and

    compressing high level signals Companding

    A system that allows user to access documents from

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    widely separated sources 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 3mw in single mode fiber and takes

    the form of a light shifter slightly in freq from the

    original light wave Bruilloin scattering

    In wide area networks what routing technique requires

    each node to take the incoming packet and retransmit

    it onto every outgoing line? Flooding

    For analog dram scanners what type of modulation is

    used after the receive 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 and

    interwinding shorts

    Why is a matched line indistinguishable from an

    infinitely long line as seen from the source? Since no

    energy is reflected from the match load, so for the

    source it appears as if energy is put into the line

    continuous to move down the line forever

    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 by converting them into a series of pulses

    whose amplitude is approximately the shape of the

    analog signal PAM

    In Ethernet LAN, what situation arises when two or

    more terminals try to transmit 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 waves becomes 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 ERP of -2dBW or 600mW Class III

    (mobile phone)

    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 emitted from 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 external

    surface of the receiver? 0.5

    Why are larger antennas receive stronger signals

    than smaller antenna? Because they have greater

    effective area or greater proportion of radiated

    energy intercepted

    What is the advantage of Dougherty linear? High

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    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 hold circuit such that the sample will

    have the same amplitude for its whole duration Flat

    top sampling

    Which of the ff. identifies the maximum transmitted

    power level of a mobile phone? 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, the freq. 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 spare parts and accessories sufficient

    enough to cover the warranty of mobile phone 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 and regulations 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