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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
7/31/2019 EST Terms and Definitions
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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