Test questions (red are incorrect answers)
1. What is transmission in telecommunication? CHOICE
a. act of transmitting electrical messages
b. act of transmitting digital waves
c. act of transmitting voice waves
2. What is Message in telecommunication? ORDER
a. Messages can be a series of data units, such as binary digits, or groups
of those, variously called frames, blocks.
3. How can we split Transmission into two parts? GAP MATCH
a. The dispatching by a sender, of a signal, message, or any form of
information for receptient.
b. The propagation of a signal via any medium.
4. List signal means CHOICE MULTIPLE
a. telegraph,
b. telephone,
c. radio,
d. television,
e. telefacsimile
f. voice
g. digital
h. microwave
5. List medium types CHOICE MULTIPLE
a. wire,
b. coaxial cable,
c. microwave,
d. optical fiber,
e. radio frequency
f. air
g. copper
h. analog
6. How can be Transmisson divided depending of the nature of sended
message format. TEXT ENTRY
a. analog
b. digital
7. What is Analog signal? GAP MATCH
a. An analog signal (or waveform) is continuously varying signal
characterized by amplitude and frequency.
8. How big is the maximum data rate over an analog facility when there are
analog loops at either end? CHOICE
a. 33.6 Kbps.
b. 56.6 Kbps
c. 64 Kbps
d. 48 Kbps
9. What is Digital signal?. GAP MATCH
a. Signal with continuously variable waveform, a sequence of discrete
pulses, representing bits with values one and zero
10. What is Baseband? INLINE CHOICE
a. Baseband is an adjective that describes signals and systems whose
range of frequencies is measured from 0 to a maximum bandwidth or
highest signal frequency; it is sometimes used as a noun for a band of
frequencies starting at 0.
11. What is line coding? GAP MATCH
a. line coding or Baseband modulation aims at transferring a digital bit
stream over an analog baseband channel.
12. Why is necessary to convert between two signal types? HOTTEXT
a. Today we don't have pure digital or pure analog networks; we have a
mix of them, Collection of them Therefore, at various points in a
network, is necessary to convert, to reduce to transfer between these
two signal types.
13. Name conversion devices HOTTEXT
a. The devices that can handle conversions are called codecs,
multiplexers, transformers and modems, transformers, stations.
14. Why we need codec in cellular networks? INLINE CHOICE
a. In cellular networks, because of the constraints and available spectrum,
a codec needs to compress, modulate, amplify the voice further to get
the most efficient use of the spectrum, channel, bandwith
transmission
15. What is the basis of term codec? CHOICE
a. contraction of coder-decoder
b. Core digital encryption
c. Cooperative decryption
16. What is the basis of term modem? CHOICE
a. contraction of modulate-demodulate
b. modern modulation
c. mode of demodulation
d. more decrypted modulation
17. Why we need modems? INLINE CHOICE
a. Modems used to infuse digital data, encrypted data ,electrical data
,more data onto transmission facilities, process, bandwith and vice
versa
18. Name digital modems CHOICE MULTIPLE
a. ISDN,
b. ADSL
c. Smart modem
d. Legacy modem
e. V32bis
f. V.everything
19. How we can transmit digital signals over analog network? INLINE
CHOICE
a. We need modem, repeater, coder, quantizer between digital source and
analog multiplexer, repeater, coder, quantizer
20. What is sampling? INLINE CHOICE
a. sampling is the reduction of a continuous, coded, encrypted, discrete
signal to a discrete, coded, encrypted, discrete, continuous signal
21. What is source coder? INLINE CHOICE
a. source coder is a device that maps an analog, coded, encrypted,
discrete input into a digital, coded, encryped, continuous output.
22. Name the basic constituents of pulse code modulator (PCM) ORDER
a. sampler, quantizer, symbol-to-bit mapper
23. What is the aim of digital modulation? INLINE CHOICE
a. The aim of digital modulation is to transfer a digital bit stream, coded
signal, encrypted signal over an analog bandpass, copper wire, optical
fiber, digital baseband channel
24. What is the aim of analog modulation? INLINE CHOICE
a. The aim of analog modulation is to transfer an analog lowpass, coded,
encrypted, discrete signal over an analog bandpass, copper wire,
optical fiber, digital baseband channel
25. What is the aim of pulse modulation methods? INLINE CHOICE
a. The aim of pulse modulation methods is to transfer a narrowband
analog, coded, baseband, digital signal over a wideband lowpass,
encrypted, narrowbaband, discrete channel or, in some of the schemes,
as a bit stream, character stream, bait stream over another digital,
widebaband, analog, point-to-point transmission system.
26. Common analog modulation techniques groups are: CHOICE MULTIPLE
a. Angular
b. Amplitude
modulations
c. Quadrature-phase
d. Phase-separated
e. Frequency-devided
27. Most fundamental digital modulation techniques are (choose 4): CHOICE
MULTIPLE
a. Phase-shift modulation,
b. frequency-shift modulation,
c. amplitude-shift keying
d. quadrature amplitude modulation
e. basefrequency modulation
f. orthogonalangular modulation
g. singular modulation
28. What is communications channel? INLINE CHOICE
a. Channel, in communications (sometimes called communications
channel), refers to the medium, state, object used to convey
information, voice, microwave, frames from a sender (transmitter) to a
receiver.
29. What is quantization? INLINE CHOICE
a. quantization is the process of approximating, rotating, conveying,
transferring a continuous range of values, bits, baits, signals (or a very
large set of possible discrete values, continuous values, functions, data)
by a relatively-small set of discrete symbols, functions, bits or integer,
current, single, floating-point values
30. Name the Types of Network Connections CHOICE MULTIPLE
a. Switched,
b. Leased-line
c. Dedicated
d. Separated
e. Parallel
f. domain
31. What is multiplexing? INLINE CHOICE
a. multiplexing (short muxing) is a process where multiple, two,
hundred, one analog message signals or digital data streams,
information, code are combined into one, tremendous, baseband,
lowpass signal.
32. What is the aim of multiplexing? INLINE CHOICE
a. The aim is to share an expensive resource, experience, computer,
signal.
33. Name the Transmission Modes CHOICE MULTIPLE
a. Asynchronous
b. Synchronous
c. Splitted
d. Amplified
e. Modulated
34. Describe Single-sideband modulation INLINE CHOICE
a. Single-sideband modulation (SSB) is a refinement of amplitude
modulation, frequency modulation, analog modulation, angle
modulation that more efficiently uses electrical power, computers
power, resources, bandwith and bandwidth, modem, router.
35. What is main feature of Frequency-division multiplexing (FDM) INLINE
CHOICE
a. With FDM, the entire frequency band, electromagnetic spectrum, radio
frequency band available on the communications link is divided into
smaller individual bands, data rates, time slots, wavelenghts or
channels, bands, bitstreams
36. What is main feature of Time-division multiplexing (TDM) INLINE
CHOICE
a. Each device in a predetermined, random, ordered, separated sequence
is allotted a time slot, channel, bandwidth, wavelength during which it
can transmit
37. What is main feature of Statistical time division multiplexing (STDM)
INLINE CHOICE
a. Statistical time division multiplexers dynamically, statistically,
randomly, indenpendently allocate the time slots, channel, bandwidth,
wavelength among the active terminals, which means you can actually
have more terminals than you have time slots, channel, bandwidth,
wavelength
38. What is main feature of Wavelength-division multiplexing (WDM) INLINE
CHOICE
a. Wavelength-division multiplexing (WDM, DWDM, CWDM) is
based on the concept of using multiple wavelengths, channels, time
slots, physical layers of light, sound, microwave, infrared on a single
fibre, wire, channel, band