3D152 Volume 1 UREs
3D152 Volume 1 UREs
- 1.What is an example of analog-to-digital and digital-to-analog techniques?
- A.
Amplitude modulation (AM) and frequency modulation (FM).
- B.
Pulse code modulation (PCM) and frequency shift keying (FSK).
- C.
Phase modulation (PM) and quadrature phase shift keying (QPSK).
- D.
Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation.
- 2.What converts analog signal information into an analog carrier signal?
- A.
Delta modulation (DM).
- B.
Digital modulation.
- C.
Analog modulation.
- D.
Adaptive modulation.
- 3.What converts analog signal information into a digital carrier signal?
- A.
Delta modulation (DM).
- B.
Analog modulation.
- C.
Digital 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 frequencies.
- 5.Amplitude modulation (AM) requires a bandwidth 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 carrier 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) modulation over conventional amplitude modulation (AM) as
- A.
2 decibels (dB) of improvement.
- B.
4 dB of improvement.
- C.
6 dB of improvement.
- D.
8 dB 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 frequency is a description of
- A.
A phase modulation (PM).
- B.
A pulse modulation.
- C.
A frequency modulation (FM).
- D.
An amplitude modulation (AM).
- 10.The amount of deviation in a frequency modulation (FM) signal is directly proportional to the modulating signal’s
- A.
Phase.
- B.
Amplitude.
- C.
Frequency.
- D.
Amplitude and frequency.
- 11.If 100 percent modulation is exceeded and there is distortion in the modulating signal, additional sidebands are generated. We identify these sidebands as what?
- A.
Transmitted intelligence.
- B.
Intensity of speech.
- C.
Composite waves.
- D.
Splatter.
- 12.What is the main advantage of differential phase shift keying (DPSK)?
- A.
Carrier presence is required to detect changes.
- 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 needs to detect changes in absolute phase values.
- 13.Which of the following is not considered an analog modulation techniques?
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Pulse-position modulation (PPM).
- D.
Pulse-code modulation (PCM).
- 14.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.
- 15.What form of modulation is insensitive to signal variations?
- A.
Delta.
- B.
Frequency shift keying (FSK).
- C.
Pulse-amplitude modulation (PAM).
- D.
Binary-phase shift keying or bi-phase shift keying (BPSK).
- 16.In quadrature-phase shift keying (QPSK) the radio frequency (RF) bandwidth for a quadriphase signal is what of that required by a bi-phase signal, given the same data rate.
- A.
Four times.
- B.
Double.
- C.
Half.
- D.
The same.
- 17.The form of pulse modulation in which the pulse is varied within a set range of positions is known as
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Pulse-position modulation (PPM).
- D.
Pulse-code modulation (PCM).
- 18.Quantized analog modulation 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 a 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 the virtual channels for multiplexing them together for transmission by using different
- A.
Wavelengths or lambdas.
- 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.
One wavelength.
- B.
Two wavelengths.
- C.
Three wavelengths.
- D.
Four wavelengths.
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