3D152 Volume 1
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- 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 Contiuously Variable Slop Delta (CVSD) Modulation
- 2.What converts analog signal information into an analog carrier singal?
- A.
Delta Modulation
- 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 Modulatiion
- D.
Adaptive Modultaion
- 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 bandwidth that is
- A.
Twice that of the modulation 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) modulqation is eliminated by
- A.
Filtering
- B.
Detection
- C.
Comperssion
- 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 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.If 100 percent of modulation is exceed and there is distortion in the modulationg signal, additional sidebands are generated. We identify these sidebands as what?
- A.
Transmitted intelligence
- B.
Intensity of speech
- C.
Composite Waves
- D.
Splatter
- 11.The amount of deviation in a frequency modulation (FM) signal is directly proportioanl to
- A.
Phase
- B.
Amplitude
- C.
Frequency
- D.
Amplitude and frequency
- 12.The amount of 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 singal
- 13.What form is 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)
- 14.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
- 15.What is the main advantage of differentual phase shift keying (DPSK)?
- A.
Carrier presence is required to detect changes
- B.
It requires a less complex reciever than a basic phase shift keying (PSK) signal
- C.
It requires a more complex reciever than a basic PSK signal
- D.
The demodulator needs to detect changes in absolute phase values
- 16.What 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)
- 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 tlerant 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 anoalog 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.
Frequncy division
- B.
Binary division
- C.
Pulse division
- D.
Time division
- 24.Wave-divison multiplexing (WDM) creeates the virtual channels for multiplexing them together for transmission by using different
- A.
Wavelenghts 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 wavelength
- C.
Three wavelength
- D.
Four wavelength
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