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The other name of Class 2 office in the North American Switching Plan.
a. Primary center
b. Section
c. Regional center
d. Toll points
ans: b
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A cell in the cellular telephone system means
a. a power source
b. small area
c. large area
d. service area
ans: b
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What is the linking point between cell phone and regular telephone?
a. Base station
b. Control office
c. C.O.
d. MTSO
ans: d
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What is the typical power output of a cellular phone?
a. 5 W
b. 10 W
c. 1 W
d. 3 W
ans: d
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When a single cell is subdivided into smaller cells the process is called
a. cell splitting
b. cell division
c. reuse
d. cell sharing
ans: a
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The first cell shape is a
a. square
b. circle
c. rectangle
d. triangle
ans: b
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In order to provide 100% coverage without overlap, cellular telephone system can
use
a. hexagon cell shape
b. triangle
c. rectangular
d. all of the above
ans: d
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What is the beamwidth of the reflector of the receiving antenna in the base
station?
a. 20 degrees
b. 30 degrees
c. 50 degrees
d. 60 degrees
ans: d
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 A cellular phone operates on
a. half duplex
b. full duplex
c. echoplex
d. lincomplex
ans: b
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Cellular phones transmit in the band from
a. 825 to 845 MHz
b. 835 to 855 MHz
c. 825 to 855 MHz
d. 825 to 865 MHz
ans: a
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Cell phone receives in the band from
a. 860 to 880 MHz
b. 870 to 890 MHz
c. 870 to 880 MHz
d. 860 to 890 MHz
ans: b
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What is the frequency separation between the transmit and the receive channels?
a. 30 MHz
b. 45 MHz
c. 55 MHz
d. 40 MHz
ans: b
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For channel 1, transmit/receive frequency is
a. 825.030/870.030 MHz
b. 835.03/880.03 MHz
c. 825.015/870.015 MHz
d. 825.15/870.15 MHz
ans: c
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The number of transmit/receive channels in the cellular system is
a. 625
b. 645
c. 655
d. 666
ans: d
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The transmission range of cellular telephony is generally about
a. 80 km
b. 65 km
c. 160 km
d. 16 km
ans: a
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When the message is transferred from one cell site transmitter to another
cellsite transmitter as the caller crosses a boundary _________ process takes
place.
a. shifting
b. hand off
c. give off
d. turn over
ans: b
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What is the sensitivity of a cellular receiver?
 a. 20 dB
b. 40 dB
c. 50 dB
d. 60 dB
ans: c
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What is the frequency deviation of the cellular telephone system?
a. � 15 kHz
b. � 30 kHz
c. � 12 kHz
d. � 75 kHz
ans: c
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Hailing channel is otherwise known as
a. conversation channel
b. calling channel
c. signaling channel
d. remote channel
ans: b
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What is an Erlang?
a. It is a unit of magnetic field intensity measured around a conductor
b. It is the number of erroneous bits received per unit of time
c. It is a unit of electrical energy radiated in space
d. It is equal to the number of simultaneous calls originated during a specific
hourly period
ans: d
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All of the cell base stations are linked together by ______ which serves as the
central office and management node for the group.
a. MTS
b. IMTS
c. MSTO
d. MTSO
ans: d
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Provides interface between the mobile telephone switching office and the mobile
units.
a. Database
b. Cell site
c. Terrestrial link
d. Radio transmitter
ans: b
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A phone call over the cellular network requires
a. simplex channels
b. half duplex channels
c. full duplex channels
d. full/full duplex
ans: c
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A method of expressing the amplitudes of complex non-periodic signals such as
speech.
a. Volume
b. Pitch
c. Frequency
d. Wavelength
ans: a
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 _________ is a signal returned to the talker after making one or more round trips
between the talker and the listener.
a. Singing
b. Echo
c. Jitter
d. Crosstalk
ans: b
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_________ is a voice operated device that insert a high loss in the opposite
direction of transmission of the talking party.
a. Hybrid
b. 2-wire circuit
c. Echo suppressor
d. VNL
ans: c
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_________ is picking up of the same station at two nearby points on the receiver
dial.
a. Double spotting
b. Hot shot
c. Image frequency
d. Bail shot
ans: a
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When one channel picks up the signal carried by another channel.
a. Echo
b. Crosstalk
c. Party line
d. Crosslink
ans: b
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What type of connector arrangement wherein a customer may move to another
location and still retain the same telephone number.
a. TPL
b. Bridge
c. TPS
d. Party line
ans: c
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It is an advantage of sidetone.
a. Transmission efficiency is increased
b. Speaker increase his voice resulting in a strengthened signal
c. No dissipation of energy in the balancing network
d. Assures the customer that the telephone is working
ans: d
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Radio communications between points using a single share frequency.
a. Simplex
b. Full duplex
c. Half-duplex
d. Full/full duplex
ans: c
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The transmission of information from multiple sources occurring on the same
facility but not at the same time.
a. FDM
b. TDM
c. WDM
d. CDM
 ans: b
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When human voice and music are transmitted, the type of communication employed is
known as
a. radiotelegraphy
b. audio frequency
c. wired radio
d. radiotelephony
ans: d
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Printed documents to be transmitted by fax are converted into a baseband electric
signal by the process of
a. copying
b. scanning
c. modulation
d. light variation
ans: b
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What is the most commonly used light sensor in a modem fax machine?
a. Phototube
b. Phototransistor
c. Liquid-crystal display
d. Charge couple device
ans: d
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In FM fax, the frequencies for black and white are ____________ respectively.
a. 1500 and 2300 Hz
b. 2300 and 1500 Hz
c. 1300 and 2400 Hz
d. 1070 and 1270 Hz
ans: a
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Which resolution produces the best quality fax?
a. 96 lines per inch
b. 150 lines per inch
c. 200 lines per inch
d. 400 lines per inch
ans: d
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Group 2 fax uses which modulation?
a. SSB
b. FSK
c. Vestigial sideband AM
d. PSK
ans: c
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The most widely used fax standard is
a. Group 1
b. Group 2
c. Group 3
d. Group 4
ans: c
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Group 3 fax uses which modulation?
a. QAM
b. FSK
c. Vestigial sideband AM
d. FM
ans: a
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Most fax printers are of which type?
a. Impact
b. Thermal
c. Electrosensitive
d. Laser xerographic
ans: b
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Facsimile standards are set by the
a. FCC
b. DOD
c. CCITT
d. IEEE
ans: c
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What type of graphics are commonly transmitted by radio fax?
a. Newspaper text
b. Architectural drawings
c. Cable movies
d. Satellite weather photos
ans: d
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What is the transmission speed of group 4 fax?
a. 4800 baud
b. 9600 baud
c. 56 kbits/s
d. 192 kbits/s
ans: c
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What is the cause of insertion loss?
a. Thermal noise that intermodulate with signal traveling on the same medium.
b. A momentary disruption of signal due to power interruption
c. A low level high frequency signal inserted into the original signal caused by
thermal noise
d. none of these
ans: d
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__________ is the master control center for cellular telephone system.
a. Cell site
b. Mobile telephone switching office
c. Central office
d. Branch office
ans: b
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Each cell site contains a
a. repeater
b. control computer
c. direct link to a branch exchange
d. touch-tone processor
ans: a
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What is a trunk?
a. The base of a communications tower.
b. A telephone line connecting two central offices.
c. A line connecting one telephone set to a PABX.
d. Refers to the body of a tree.
ans: b
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Cellular telephones use which type of operation?
 a. Simplex
b. Half-duplex
c. Full-duplex
d. Triplex
ans: c
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What is the maximum frequency deviation of an FM cellular transmitter?
a. 6 kHz
b. 12 kHz
c. 30 kHz
d. 45 kHz
ans: b
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Receive channel 22 is 870.66 MHz. Receive channel 23 is
a. 870.36 MHz
b. 870.63 MHz
c. 870.96 MHz
d. 870.69 MHz
ans: d
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A transmit channel has a frequency of 837.6 MHz. The received channel frequency
is
a. 729.6 MHz
b. 837.6 MHz
c. 867.6 MHz
d. 882.6 MHz
ans: d
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A receive channel frequency is 872.4 MHz. To develop an 82.2 MHz IF, the
frequency synthesizer must supply an LO signal of
a. 790.2 MHz
b. 827.4 MHz
c. 954.6 MHz
d. 967.44 MHz
ans: c
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The output power of a cellular radio is controlled by the
a. user or caller
b. cell site
c. called party
d. MTSO
ans: d
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When the signal from a mobile cellular unit drops below a certain level, what
action occurs?
a. The unit is "handed off" to a closer cell
b. The call is terminated
c. The MTSO increases power level
d. The cell site switches antenna
ans: a
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In a cellular radio, the duplexer is a
a. ferrite isolator
b. waveguide assembly
c. part of TR/ATR tubes
d. pair of sharp bandpass filters
ans: d
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On a telephone system, the loop is open during
 a. on-hook condition
b. off-hook condition
c. both A and B
d. none of these
ans: a
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For every button pressed on a touch-tone telephone, how many signals are
transmitted to the C.O.?
a. Two VHF signals
b. One VHF signal and one audio-frequency tone
c. Two audio-frequency tones
d. Three audible tones
ans: c
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What is the traffic model about blocked calls clear condition specified blocking
probability?
a. Erlang B
b. Erlang C
c. Erlang D
d. Poisson
ans: a
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A touch-tone telephone generates how many different tones.
a. 10 audio-frequency tones
b. 8 audible tone frequencies
c. 4 VHF signals
d. 16 audio-frequency tones
ans: b
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The base-to-mobile frequency assignment of a GSM system.
a. 890 - 915 MHz
b. 825 - 845 MHz
c. 870 - 890 MHz
d. 935 - 960 MHz
ans: d
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A voice-grade channel is suitable for transmission of
a. VHF signals
b. UHF signals
c. VHF and UHF signals
d. signals with a frequency ranging from 300 to 3400 Hz
ans: d
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What is the bandwidth of cellular CDMA system?
a. 1.23 MHz
b. 1.23 GHz
c. 1.23 kHz
d. 1.23 THz
ans: a
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What is a communication link?
a. It is a piece of wire that is connected to ground terminals of all
communications equipment in one establishment.
b. It is a channel or circuit intended to connect other channels or circuits.
c. It is a cable connecting a transmitter to the antenna
d. It refers to a radio link.
ans: b
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Block calls held condition specified the held probability at a time period equal
to an average holding time.
a. Erlang B
b. Erlang C
c. Erlang D
d. Poisson
ans: d
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What is an echo?
a. A signal of the same amplitude but 180 degrees out of phase from the original
signal and mixed with the original signal at the transmitter to produce a more
intelligible output signal.
b. A wave which has been reflected or otherwise returned with sufficient
magnitude and delay for it to be perceptible in some manner as a wave distinct from
that directly transmitted.
c. The signal having a higher frequency than the original and transmitted back to
earth by a passive satellite.
d. A reflected signal.
ans: b
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What is the system used by Personal Communication Network (PCN)
a. TACS
b. Modified GSM
c. AMPS
d. CDMA
ans: b
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Termination refers to
a. cutting both ends of a conductor
b. disconnecting a line from a transmitter
c. looking back impedance of a line with no load
d. load connected to the output end of a transmission line
ans: d
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The multiple access used by Digital European Cordless Telephone (DECT).
a. CDMA
b. FDMA
c. TDMA
d. CDMA/FDMA
ans: c
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Blocked calls delay condition specified delay probability.
a. Erlang B
b. Erlang C
c. Erlang D
d. Poisson
ans: b
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Status information provided by telephone signaling.
a. Busy tone, dial tone and ringing
b. Congestion and call charge data
c. All of the above
d. none of the above
ans: c
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The modulation technique used by DECT.
a. GFSK
b. ASK
c. QAM
d. PSK
 ans: a
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What is a four-wire circuit?
a. is used between serving central offices for long-distance connections, with
one pair being used for each direction of transmission.
b. Is a circuit with three output terminals and one input terminal
c. Is an oscillator that produces four different frequencies simultaneously
d. A circuit consisting of four transmission lines.
ans: a
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Cellular CDMA system uses what modulation method?
a. GFSK
b. ASK
c. QAM
d. BPSK
ans: d
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PABX means
a. Private All-purpose Broadcasting Exchange
b. Private Automatic Branch Exchange
c. Public Access Bi-directional Exchange
d. Public Automatic Branch Exchange
ans: b
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What is the voted cellular digital standard at TIA?
a. Digital AMPS
b. GSM
c. CDMA
d. TACS
ans: a
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What is the number of channels for Band A and for Band B in Digital AMPS?
a. 832
b. 416
c. 666
d. 888
ans: b
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The mobile-to-base frequency assignment for GSM system is
a. 890 - 915 MHz
b. 935 - 960 MHz
c. 870 - 890 MHz
d. 825 - 845 MHz
ans: a
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The range (in miles) of a cellular CDMA system.
a. 13
b. 30
c. 45
d. 20
ans: a
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In a cellular system, ____________ is used to measure the spectrum efficiency.
a. radio efficiency
b. diversity
c. frequency reuse
d. radio capacity
ans: d
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 Which of the following echo is completely out of control?
a. Worst echo
b. Reverberation
c. Singing
d. Feedback
ans: c
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Which of the following devices increase the battery voltage on a loop and extends
its signaling range?
a. Loop extender
b. VF repeater
c. VF amplifier
d. All of these
ans: a
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Under ordinary circumstances, the CCITT recommends that the number of circuits in
tandem must not exceed
a. 9
b. 10
c. 11
d. 12
ans: d
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What is the system capacity of AMPS?
a. 30,000
b. 60,000
c. 100,000
d. 120,000
ans: c
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NAM means
a. Non Alternable Memory
b. Number Allocation Module
c. Numeric Assignment Module
d. Numeric Access Module
ans: c