3d1x2 5 Level CDC Vol. 1
- 1.What is an example of analog-to-digital and digital-to-analog techniques?
- A.
Amplitude modulation(AM) and freqeuncy modulation (FM)
- B.
Pulse code modulation (PCM) and frequency shift keying (FSK)
- C.
Phase modualtion (PM) and quadrature phase shift keying (QPSK)
- D.
Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation
- 2.What converts analog signal informaton into an analog carrier signal?
- A.
Delta modulation (DM)
- B.
Digital modulation
- C.
Analog modulation
- D.
Adaptive modulation
- 3.What converts analog signal informaton into a digital carrier signal?
- A.
Delta Modulation (DM)
- B.
Digital modulation
- C.
Analog modulation
- D.
Adaptive modulation
- 4.The information-carrying components that occur on either side of a carrier are called
- A.
Sidebands.
- B.
Sine waves.
- C.
Frequency translators.
- D.
Modulating fequencies.
- 5.Amplitude modulation (AM) requires a bandwith that is
- A.
Twice that of the modulating signal.
- B.
Half that of the modulating signal.
- C.
Twice that of the carrier signal.
- D.
Half that of the carrire signal.
- 6.The upper sideband in a single-sideband suppressed carrier (SSBSC) modulation is eliminated by
- A.
Filtering.
- B.
Detection.
- C.
Compression.
- D.
Companding.
- 7.We can express the 6-to-1 improvement of the single-sideband suppressed carrier (SSBSC) mopdulation over conventional amplitude modulation (AM) as
- A.
2 decibels (dB) of improvement
- B.
4 decibels of improvement
- C.
6 decibels of improvement
- D.
8 decibels of improvement
- 8.The only basic waveform in nature is a
- A.
Carrier wave.
- B.
Pure sine wave.
- C.
Resultant wave.
- D.
Composite wave.
- 9.A modulated waveform that contains a carrier plus two sidebands for each modulation frrequency is a description of
- A.
A phase modulation (PM).
- B.
Pulse modulation.
- C.
A frequency modulation.
- D.
An amplitude modulation (AM).
- 10.If 100 percent modulation is exceeded and there is distortion in the modulating signal, addititonal sidebands are generated. We indentify these sidebands as what?
- A.
Transmitted intelligence
- B.
Intensity of speech
- C.
Composite waves
- D.
Splatter
- 11.The amount of deviation in a frquency modulation (FM) signal is directly proportinal to the modulating signal's
- A.
Phase.
- B.
Amplitude.
- C.
Frequency.
- D.
Apmlitude and frequency.
- 12.The amount of phase shift in a phase modulation (PM) signal is directly proportional to the
- A.
Modulation index.
- B.
Rate of phase shift.
- C.
Frequency of the modulating signal.
- D.
Amplitude of the modulating signal.
- 13.What form of modulation is insensitive to signal variations?
- A.
Delta
- B.
Frequency shift keying (FSK)
- C.
Pulse-amplitude modulation (PAM)
- D.
Binary-phaseshift keying or bi-phase shift keying (BPSK)
- 14.In quadrature-phase shift keying (QPSK) the radio frequency (RF) bandwith for a quadriphase signal is what of that required by a bi-pahse signal, given the same data rate?
- A.
Four times
- B.
Double
- C.
Half
- D.
The same
- 15.What is the main advantage of differential phase shift keying (DPSK)?
- A.
Carrier presence is required to detect change
- B.
It requires a less complex receiver than a basic phase shift keying (PSK) signal
- C.
It requires a more complex receiver than a basic PSK signal
- D.
The demodulator needds to detect changes in the absolute phase values
- 16.Which of the following is not considered an analog modulation technique?
- A.
Pulse-amplitude modulation (PAM)
- B.
Pulse-duration modulation (PDM)
- C.
Pulse-positon modulation (PPM)
- D.
Pulse-code modulation (PCM)
- 17.The form of pulse modulation in which the pulse is varied within a set range of positoins is known as
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Pulse-positon modulation (PPM).
- D.
Pulse-code modulation (PCM).
- 18.Quanitized analog modulation (QAM) is actually
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Less tolerant of noise than frequency modulation (FM).
- D.
Analog-to-digital conversion
- 19.How many bits per character of a 16-step pulse-code modulation (PCM) system are used to describe the quantized analog sample?
- A.
3
- B.
4
- C.
5
- D.
8
- 20.The process of coding pulse code modulation (PCM) quantized pulses to make them a constant duration and amplitude is
- A.
Encoding.
- B.
Companding.
- C.
Uniform quantizing.
- D.
Nonuniform quantizing.
- 21.In Time Division Multiplexing (TDM), the transmitting multiplexer will put a bit or byte from each of the incoming lines into a specifically allocated what?
- A.
Channel
- B.
Trunk
- C.
Time slot
- D.
Port
- 22.The two major types of frame structures are
- A.
Low speed and high speed
- B.
High speed and EBCDIC
- C.
CCITT and low speed
- D.
EBCDIC and CCITT
- 23.The method of multiplexing the T1 multiplexer uses is
- A.
Frequency division.
- B.
Binary division.
- C.
Pulse division.
- D.
Time division.
- 24.Wave-division multiplexing (WDM) creates teh virtual channels for multiplexing them together for transmission by using different
- A.
Wavelengths or lambas.
- B.
Wavelengths or gammas.
- C.
Frequencies or lambdas.
- D.
Frequencies or gammas.
- 25.The most common wave-division multiplexing (WDM) system uses how many wavelengths?
- A.
1
- B.
2
- C.
3
- D.
4
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