3D152 Volume 1
- 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
Correct Answer
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
Correct Answer
C. Analog 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
Correct Answer
C. Digital Modulatiion -
- 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
Correct Answer
A. Sidebands -
- 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
Correct Answer
A. Twice that of the modulation signal -
- 6.
The upper sideband in a single-sideband suppressed carrier (SSBSC) modulqation is eliminated by
- A.
Filtering
- B.
Detection
- C.
Comperssion
- D.
Companding
Correct Answer
A. Filtering -
- 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
Correct Answer
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
Correct Answer
B. Pure sine 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)
Correct Answer
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
Correct Answer
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
Correct Answer
B. Amplitude -
- 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
Correct Answer
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)
Correct Answer
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
Correct Answer
C. Half -
- 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
Correct Answer
B. It requires a less complex reciever than a basic phase shift keying (PSK) signal -
- 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)
Correct Answer
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)
Correct Answer
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
Correct Answer
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
Correct Answer
B. 4 -
- 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
Correct Answer
A. Encoding -
- 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
Correct Answer
C. Time Slot -
- 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
Correct Answer
C. CCITT and low speed -
- 23.
The method of multiplexing the T1 multiplexer uses is
- A.
Frequncy division
- B.
Binary division
- C.
Pulse division
- D.
Time division
Correct Answer
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
Correct Answer
A. Wavelenghts or lambdas -
- 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
Correct Answer
B. Two wavelength -
- 26.
Individual pulses within a digital signal are
- A.
Bits
- B.
Bytes
- C.
Codes
- D.
Blocks
Correct Answer
A. Bits -
- 27.
What unit is most commonly used in data systems to express signaling speed?
- A.
Baud
- B.
Baudot
- C.
Sense Interface
- D.
Bits per second
Correct Answer
D. Bits per second -
- 28.
Bit count integrity problems are primarily cause by
- A.
Impedance mismatch
- B.
System timing faults
- C.
Improper equipment settings
- D.
Changes in atmospheric conditions
Correct Answer
B. System timing faults -
- 29.
Three categorties of synchronization used in digital data circuits are
- A.
Synchronous, asynchronous and isochronous
- B.
Isochronous, asynchronous, and bisynchronous
- C.
Nonsynchronous, bisynchronous, and synchronous
- D.
Asynchronous, bisynchonous, and nonsynchronous
Correct Answer
A. Synchronous, asynchronous and isochronous -
- 30.
Which option is a characteristic of synchronizing bits within the signal stream describes
- A.
Time pulses are transmitted within the signal stream
- B.
Start and stop pulses control data transmission
- C.
System timing is not of critical importance
- D.
All data bits are the same length in time
Correct Answer
D. All data bits are the same length in time -
- 31.
A digital signal that contains synchronizing bits within the signal stream describes
- A.
Synchronous operation
- B.
Asynchronous operation
- C.
Synchronous and/or isochronous operation
- D.
Asynchronous and/or synchronous operation
Correct Answer
B. Asynchronous operation -
- 32.
In what type of signal is the information contained in the transition and there is a transition from one state to the other only mark bit is sent?
- A.
Non-return-to-zero (NRZ) level
- B.
Non-return-to-zero mark
- C.
Non-return-to-zero space
- D.
Return-to-zero level
Correct Answer
B. Non-return-to-zero mark -
- 33.
In what type of signal does the signal level move to one of the discrete levels, but returns to zero level after a predetermined time?
- A.
Non-return-to-zero (NRZ) level
- B.
Non-return-to-zero mark
- C.
Non-return-to-zero space
- D.
Return-to-zero
Correct Answer
D. Return-to-zero -
- 34.
Which statement best describes an alternate mark inversion (AMI) signal?
- A.
The information is transmitted in three different voltage levels
- B.
A logic one is transmitted as positive voltage if the previous logic one was negative
- C.
The level always returns to zero for 50 percent of the bit cycle after every transition
- D.
Bipolar violations are intentionally inserted into a data signal to break up long strings of zeros
Correct Answer
B. A logic one is transmitted as positive voltage if the previous logic one was negative -
- 35.
Digital coding techniques such as a binary with eight-zero substitution (B8ZS) are becoming more popular because they are designed to
- A.
provide error-free signaling
- B.
Operate at higher data rates
- C.
Eliminate bipolar violations
- D.
Maintain ones density standards
Correct Answer
D. Maintain ones density standards -
- 36.
Which statement best describes a binary with eight-zero substitution (B8ZS) signal
- A.
The information is transmitted in three different voltage levels.
- B.
A logic one is transmitted as positive voltage logic one was negative
- C.
The level always returns to zero for 50 percent of the bit cycle after every transition
- D.
Bipolar violations are intentionslly inserted into a data signal to break up long strings of zeros
Correct Answer
D. Bipolar violations are intentionslly inserted into a data signal to break up long strings of zeros -
- 37.
The major difference between conditioned di-phase (CDI) and other schemes is the
- A.
Lack of mid-bit transitions
- B.
Use of mid-bit transitions for timing
- C.
Data being encoded in the mid-bit transitions
- D.
Voltage levels used for signaling the mid-bit transitions
Correct Answer
B. Use of mid-bit transitions for timing -
- 38.
How many bits are in the D4 framing sequence?
- A.
8
- B.
12
- C.
24
- D.
48
Correct Answer
B. 12 -
- 39.
How many bits are in the extended superframe format (ESF) framing sequence?
- A.
8
- B.
12
- C.
24
- D.
48
Correct Answer
C. 24 -
- 40.
What communications control signal uses two-frequency dialing combination?
- A.
Pulse dialing
- B.
Tone dialing
- C.
Digit dialing
- D.
Address dialing
Correct Answer
B. Tone dialing -
- 41.
What communication information signal uses a continuous 350- and 440-Hz frequency pair?
- A.
Dial tone
- B.
Ringback signal
- C.
Off-hook alert
- D.
Call waiting
Correct Answer
A. Dial tone -
- 42.
What communications information signal uses a signal cycled on and off for 0.5 second and contains the generation of a 480- and 620- Hz frequency pair?
- A.
Dial tone
- B.
Busy signal
- C.
Off-hook alert
- D.
Call waiting
Correct Answer
B. Busy signal -
- 43.
What communications supervisory signal uses a continuous application of direct current voltage for signaling?
- A.
Record warning
- B.
Fast busy signal
- C.
Loop start
- D.
E and M
Correct Answer
C. Loop start -
- 44.
When is the voltage applied in loop-start signaling?
- A.
When dial tone is present
- B.
On- hook condition
- C.
Off- hook condition
- D.
During the ringback signal
Correct Answer
C. Off- hook condition -
- 45.
In common associated signaling (CAS), what is the seventh bit in frames 6 and 12 used to convey signaling information known as?
- A.
Bit robbing
- B.
Bit stuffing
- C.
Frame correction
- D.
Frame enhancement
Correct Answer
A. Bit robbing -
- 46.
In that commen channel signaling (CCS) mode are the messages relating to signaling between two points conveyed directly interconnecting these signaling points?
- A.
Associated mode
- B.
Nonassociated mode
- C.
Quasi-associated mode
- D.
Multi-associated mode
Correct Answer
A. Associated mode -
- 47.
What are the two principles weighting characteristics in use with telecommunication circuit noise?
- A.
Institute of Electronic and Electrical Engineers and CCITT psophometric
- B.
Noise analysis and CCITT psophometric
- C.
CCITT psophometric and C-message
- D.
C-message and noise anaysis
Correct Answer
C. CCITT psophometric and C-message -
- 48.
While timing makes sure the equipment is sending and receiving bits at the same time intervals, syncronization makes sure that the
- A.
Recieve equipment timing is set properly
- B.
Transmit equipment timing is set properly
- C.
Receive equipment can find its place in the bit stream
- D.
Transmit equipment can find its place in the bit stream
Correct Answer
C. Receive equipment can find its place in the bit stream -
- 49.
What term is associated with the delay or lag introduced in the application of voltage from one selection to the next?
- A.
Latency
- B.
Phase delay
- C.
Propagation constant
- D.
Phase delay distortion
Correct Answer
A. Latency -
- 50.
Attenuation distortion is cause by
- A.
A line loss for the various frequency components comprising a voice transmission
- B.
The line loss, the distance of transmission lines, and faults in the transmission cables
- C.
Faults in the transmission cables and the number of splices in the line varying with the frequency
- D.
Differing attenuation rates for the various frequency components comprising a voice frequency transmission
Correct Answer
D. Differing attenuation rates for the various frequency components comprising a voice frequency transmission -
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