3c251 CDC Ure's Set 2

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  • 1/124 Questions

    If 100 percent modulation is exceeded and there is distortion in the modulating signal, additional sidebands are generated. We identify these sidebands as

    • Transmitted intelligence
    • Intensity of speech
    • Composite waves
    • Splatter
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About This Quiz

This quiz, titled '3C251 cdc URE'S Set 2', assesses knowledge in analog and digital modulation techniques, including PCM and AM. It explores the bandwidth requirements, improvements in modulation, and identifies issues like signal splatter, crucial for professionals in communications technology.

3c251 CDC Ures Set 2 - Quiz

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  • 2. 

    Having marker pulses at the beginning of each frame of time-division multiplexing (TDM) signal is one method of

    • Encryption

    • Synchronization

    • Sampling the signal

    • Decreasing bandwidth required

    Correct Answer
    A. Synchronization
    Explanation
    Marker pulses at the beginning of each frame of time-division multiplexing (TDM) signal are used for synchronization. These marker pulses help to align and synchronize the different channels within the TDM signal, ensuring that each channel starts and ends at the correct time. By using marker pulses, the receiver can accurately identify the boundaries of each channel and extract the correct data from the TDM signal. Therefore, synchronization is the correct answer in this case.

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  • 3. 

    which module is the communication link between the AN/FCC-100(V) 9 and the operator’s panel or an external control terminal

    • Processor module

    • Aggregate module

    • Port carrier module

    • Interface module

    Correct Answer
    A. Interface module
    Explanation
    The correct answer is the interface module. The interface module serves as the communication link between the AN/FCC-100(V) 9 and the operator's panel or an external control terminal. It allows for the exchange of information and commands between these components, facilitating the control and operation of the system.

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  • 4. 

    what length of shiner is required for a wire wrap terminal connection?

    • 1 inch

    • 1 ¼ to 1 ½ inch

    • 2 inches

    • 3 inches

    Correct Answer
    A. 1 ¼ to 1 ½ inch
    Explanation
    The correct answer is 1 ¼ to 1 ½ inch. This length of shiner is required for a wire wrap terminal connection.

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  • 5. 

    What is the main advantage of differential phase shift keying (DPSK)?

    • Carrier presence is required to detect changes

    • It requires a less complex receiver than a basic phase shift keying (PSK) signal

    • It requires a more complex receiver than a basic PSK signal

    • The demodulator needs to detect changes in absolute phase values.

    Correct Answer
    A. It requires a less complex receiver than a basic phase shift keying (PSK) signal
    Explanation
    Differential phase shift keying (DPSK) has the main advantage of requiring a less complex receiver than a basic phase shift keying (PSK) signal. This means that DPSK can be implemented with simpler and more cost-effective receiver circuits, making it a practical choice for communication systems. Unlike basic PSK, DPSK does not require the receiver to detect changes in absolute phase values, which reduces complexity and improves efficiency.

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  • 6. 

    Bits taken from an input channel data stream at a rate at least twice the highest frequency appearing in the intelligence signal we call

    • The sampling rate

    • Pulse-bit stuffing

    • Pulse-code modulation

    • Elastic storage implementation

    Correct Answer
    A. The sampling rate
    Explanation
    The correct answer is "the sampling rate". This refers to the rate at which bits are taken from an input channel data stream. It should be at least twice the highest frequency appearing in the intelligence signal to ensure accurate representation of the signal. This is necessary for various processes such as pulse-bit stuffing, pulse-code modulation, and elastic storage implementation.

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  • 7. 

    In a synchronous system, performance of all operations is controlled by a

    • Step pulse

    • Master clock

    • Start-stop pulse

    • Synchronization pulse

    Correct Answer
    A. Master clock
    Explanation
    In a synchronous system, the performance of all operations is controlled by a master clock. The master clock serves as the central timing reference for all components in the system, ensuring that they operate in sync and at the correct timing intervals. It provides a consistent and reliable timing signal that coordinates the execution of various tasks and operations within the system. This allows for precise coordination and synchronization of actions, ensuring smooth and efficient operation of the system as a whole.

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  • 8. 

    how many bits are in the extended superframe format (ESF) framing sequence

    • 8

    • 12

    • 24

    • 48

    Correct Answer
    A. 24
    Explanation
    The extended superframe format (ESF) framing sequence consists of 24 bits.

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  • 9. 

    what communications information signal could use a signal cycled on for 1.0 seconds and off for 1.0 seconds and contains the generation of a multifrequency howl

    • Dial tone

    • Fast busy signal

    • Off-hook alert

    • Call waiting

    Correct Answer
    A. Off-hook alert
    Explanation
    The off-hook alert is a communication information signal that can be cycled on for 1.0 second and off for 1.0 second. It is used to indicate that a phone line is in use or that a phone receiver is off the hook. This signal is often heard when making or receiving a phone call, alerting the user that the line is currently busy.

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  • 10. 

    within distribution frame, temporary wiring is connected to the

    • Right side of vertical terminal boards and the bottom horizontal terminal boards

    • Left side of vertical boards and the bottom of horizontal terminal boards

    • right side of vertical terminal boards and the top horizontal terminal boards

    • Left side of vertical terminal boards and the top horizontal terminal boards

    Correct Answer
    A. right side of vertical terminal boards and the top horizontal terminal boards
  • 11. 

    What is an example of analog to digital and digital to analog techniques

    • Amplitude modulation (AM) and frequency modulation (FM).

    • Pulse code modulation (PCM) and frequency shift key (FSK).

    • Phase modulation (PCM) and quadrature phase shift key (QPSK).

    • Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation.

    Correct Answer
    A. Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation.
    Explanation
    Pulse code modulation (PCM) is an example of analog to digital (A/D) technique, where an analog signal is converted into a digital signal by sampling and quantizing the amplitude of the signal at regular intervals. Continuously variable slope delta (CVSD) modulation, on the other hand, is an example of digital to analog (D/A) technique, where a digital signal is converted back into an analog signal by reconstructing the original waveform using a continuous variable slope technique. Therefore, PCM and CVSD modulation represent both A/D and D/A techniques.

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  • 12. 

    What modulation technique is a complete digitization process since it converts an analog signal into one that is discrete with respect to both time and amplitude (or polarity)?

    • Pulse-amplitude modulation (PAM).

    • Pulse-duration modulation (PMD).

    • Pulse-width modulation (PWM).

    • Pulse-code modulation (PCM).

    Correct Answer
    A. Pulse-code modulation (PCM).
    Explanation
    Pulse-code modulation (PCM) is a complete digitization process because it converts an analog signal into a discrete signal in both time and amplitude. PCM samples the analog signal at regular intervals and assigns a binary code to each sample, representing its amplitude. This binary representation allows for accurate reproduction of the original analog signal. In PCM, the time and amplitude of the signal are both quantized, resulting in a fully digitized signal.

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  • 13. 

    wave-division multiplexing (WDM) creates the virtual channels for multiplexing them together for transmission by using different

    • Wavelengths or lambdas

    • Wavelengths or gammas

    • Frequencies or lambdas

    • Frequencies or gammas

    Correct Answer
    A. Wavelengths or lambdas
    Explanation
    Wave-division multiplexing (WDM) is a technique used to combine multiple optical signals onto a single optical fiber by assigning each signal a different wavelength or lambda. This allows for the transmission of multiple virtual channels simultaneously. The correct answer states that WDM creates the virtual channels for multiplexing by using different wavelengths or lambdas. This is accurate as WDM utilizes different wavelengths or lambdas to separate and combine the signals, enabling efficient and high-capacity transmission over a single fiber.

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  • 14. 

    When using an ohmmeter to take resistance reading, what preliminary precaution should you take

    • Properly seat the test lead into the current imput jack

    • Disconnect the power from the circuit being tested

    • Place the meter in the frequency mode

    • Set the range for the maximum reading

    Correct Answer
    A. Disconnect the power from the circuit being tested
    Explanation
    When using an ohmmeter to take a resistance reading, it is important to disconnect the power from the circuit being tested as a preliminary precaution. This is necessary to ensure the safety of the person taking the reading and to prevent any potential damage to the ohmmeter or the circuit itself. By disconnecting the power, the risk of electric shock or short-circuiting is minimized, allowing for accurate and safe resistance measurements to be taken.

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  • 15. 

    All of these are considered analog modulation techniques except

    • Pulse-amplitude modulation (PAM)

    • Pulse-duration modulation (PDM)

    • Pulse-position modulation (PPM)

    • Pulse-code modulation (PCM)

    Correct Answer
    A. Pulse-code modulation (PCM)
    Explanation
    Pulse-code modulation (PCM) is a digital modulation technique that converts analog signals into a digital format. It samples the amplitude of the analog signal at regular intervals and quantizes each sample into a binary code. On the other hand, pulse-amplitude modulation (PAM), pulse-duration modulation (PDM), and pulse-position modulation (PPM) are all analog modulation techniques that modify the amplitude, duration, or position of pulses to carry information. Therefore, pulse-code modulation (PCM) is the only option that does not fall under the category of analog modulation techniques.

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  • 16. 

    Noise may be introduced into speech signals by thermal agitation and

    • Power variations

    • Amplitude variations

    • Black body radiation

    • Molecular breakdown of electronic components

    Correct Answer
    A. Black body radiation
    Explanation
    Black body radiation refers to the electromagnetic radiation emitted by an object due to its temperature. In the context of speech signals, black body radiation can introduce noise by causing random fluctuations in the signal. This noise can affect the amplitude and power of the speech signal, leading to variations and distortions. Therefore, black body radiation is a possible source of noise in speech signals.

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  • 17. 

    what property of fiber optic cable provides high security for communication networks?

    • Fiber optic cable emits a little less radiation than twisted pair wire cable

    • Fiber optic cable is virtually untappable without detection

    • Fiber optic cable has very low error rate

    • Fiber optic cable is immune to crosstalk

    Correct Answer
    A. Fiber optic cable is virtually untappable without detection
    Explanation
    The property of fiber optic cable that provides high security for communication networks is that it is virtually untappable without detection. Unlike other types of cables, fiber optic cables do not emit electromagnetic signals that can be easily intercepted or tapped into. This makes it extremely difficult for unauthorized individuals to access the information being transmitted through the cable without being detected.

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  • 18. 

    which type distribution frame is used to connect unclassified date circuits and local equipment

    • Combined

    • Black

    • Main

    • Red

    Correct Answer
    A. Black
    Explanation
    The black distribution frame is used to connect unclassified data circuits and local equipment.

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  • 19. 

    which color is considered an additional ring color in a typical 25 pair cable

    • Slate

    • Green

    • Brown

    • Orange

    Correct Answer
    A. Slate
    Explanation
    Slate is considered an additional ring color in a typical 25 pair cable.

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  • 20. 

    To prevent frequency modulation (FM) radio stations from interfering with each other, the Federal Communications Commission (FCC) has set limits that allow each station to cause its oscillator frequency to deviate no more than

    • 20 kHz

    • 50 kHz

    • 75 kHz

    • 88 kHz

    Correct Answer
    A. 75 kHz
    Explanation
    The Federal Communications Commission (FCC) has set limits on the amount of frequency deviation allowed for each FM radio station to prevent interference with other stations. In this case, the correct answer is 75 kHz, which means that each station is allowed to cause its oscillator frequency to deviate by a maximum of 75 kHz. This limit ensures that the stations can operate without causing significant interference to neighboring stations, allowing for clear and reliable radio broadcasts.

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  • 21. 

    Up to what percent of speech is redundant?

    • 35

    • 45

    • 65

    • 75

    Correct Answer
    A. 75
    Explanation
    Redundancy in speech refers to the repetition or inclusion of unnecessary information. The correct answer is 75 because it suggests that 75% of speech is redundant, meaning that a significant portion of spoken language contains unnecessary or repetitive elements. This emphasizes the importance of concise and efficient communication to avoid redundancy and ensure clear and effective speech.

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  • 22. 

    in communications, what is essential for continuous error-free performance?

    • Strong signal

    • Good timing

    • Standardized signal format

    • Error correction software

    Correct Answer
    A. Good timing
    Explanation
    Good timing is essential for continuous error-free performance in communications. Timing refers to the synchronization of signals and data transmission, ensuring that information is transmitted and received at the correct time. Without proper timing, signals may be received or transmitted incorrectly, leading to errors in communication. Therefore, having good timing is crucial for maintaining a reliable and error-free communication system.

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  • 23. 

    what has made very high data rate transmission possible on a fiber optics cable?

    • The use of light-emitting diodes

    • The broad bandwidth of the cable

    • The low signal to noise ratio of the cable

    • The mulitiplexing technique used in fiber optics

    Correct Answer
    A. The use of light-emitting diodes
    Explanation
    The correct answer is the use of light-emitting diodes. Light-emitting diodes (LEDs) are used in fiber optics cables to transmit data at very high rates. LEDs are capable of emitting light at high frequencies, which allows for faster transmission of data. The use of LEDs in fiber optics technology has greatly increased the data rate that can be achieved on these cables.

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  • 24. 

    combined distribution frames encompass the functions of a main distribution frame and

    • An intermediate distribution frame

    • A black distribution frame

    • A red distribution frame

    • A mid distribution frame

    Correct Answer
    A. An intermediate distribution frame
    Explanation
    An intermediate distribution frame combines the functions of a main distribution frame and other types of distribution frames such as black, red, and mid distribution frames. It serves as a central point for connecting various communication lines and distributing them to different areas or devices within a network. By combining multiple functions into one frame, it helps streamline the distribution process and improve the efficiency of the network.

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  • 25. 

    what wave-division multiplexing (WDM) technology sends a large number of optical signals closely together

    • WMD

    • coarse wave division multiplexing (CWDM)

    • Dense wave division multiplexing (DWDM)

    • Long wave division multiplexing (LDWDM)

    Correct Answer
    A. Dense wave division multiplexing (DWDM)
    Explanation
    DWDM technology sends a large number of optical signals closely together.

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  • 26. 

    which test equipment is best for checking equipment grounds

    • Time-domain reflectometer

    • Protocol analyzer

    • Cable scanner

    • Mulitmeter

    Correct Answer
    A. Mulitmeter
    Explanation
    A multimeter is the best test equipment for checking equipment grounds because it can measure voltage, current, and resistance. It can be used to check if the ground connection is properly established and if there are any faults or breaks in the ground circuit. A multimeter is versatile and commonly used for electrical testing and troubleshooting tasks, making it suitable for checking equipment grounds.

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  • 27. 

    in what type of signal level move to one of the discrete signal levels, but returns to the zero level after a predetermined time

    • Non-return-to-zero (NZR) level

    • Non-return-to-zero mark

    • Non-return-to-zero space

    • Return-to-zero space

    Correct Answer
    A. Return-to-zero space
    Explanation
    A return-to-zero space signal level refers to a type of signal that moves to one of the discrete signal levels but returns to the zero level after a predetermined time. In this case, the signal level returns to zero during the space between two consecutive pulses, indicating a binary zero. This is in contrast to non-return-to-zero (NRZ) levels where the signal level remains at a constant level until the next pulse.

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  • 28. 

    in common associated signaling (CAS) signaling, the seventh bit in frames 6 and 12 in are used to convey signaling information. This is known as

    • Bit robbing

    • Bit stuffing

    • Frame correction

    • Frame enhancement

    Correct Answer
    A. Bit robbing
    Explanation
    In Common Associated Signaling (CAS) signaling, the seventh bit in frames 6 and 12 is used to convey signaling information. This process is known as "bit robbing." Bit robbing involves taking one bit from each frame and using it for signaling purposes, which allows for the transmission of additional information without increasing the overall frame size.

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  • 29. 

    Which multiplex scheme periodically redefines the length of its frames?

    • Asynchronous time division multiplexing (TDM)

    • Frequency data multiplexing (FDM)

    • Synchronous TDM

    • Isochronous TDM

    Correct Answer
    A. Asynchronous time division multiplexing (TDM)
    Explanation
    Asynchronous time division multiplexing (TDM) is the multiplex scheme that periodically redefines the length of its frames. In this scheme, each input signal is divided into time slots of fixed length, but the length of the frames can vary. This allows for more efficient use of the available bandwidth as the length of the frames can be adjusted based on the amount of data being transmitted. This is different from synchronous TDM, where the length of the frames remains constant. FDM and isochronous TDM do not redefine the length of their frames.

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  • 30. 

    what causes absorption loss in a fiber optic cable

    • Impurities in the fiber

    • The angle at which a ray from a light source enters the fiber

    • Differences in the refractive indexes of the core and cladding

    • Imperfections in the region where the core interfaces the cladding

    Correct Answer
    A. Impurities in the fiber
    Explanation
    Impurities in the fiber can cause absorption loss in a fiber optic cable. These impurities can include contaminants or foreign particles that are present within the fiber material. When light passes through the fiber, these impurities can absorb some of the light energy, resulting in a loss of signal strength. This absorption loss can negatively impact the overall performance and efficiency of the fiber optic cable.

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  • 31. 

     for a wire-wrapped termination to be considered and efficient connection, you must wrap the wire lead at least

    • Once around the terminal connector

    • Three times around the terminal connector

    • Five times around the terminal connector

    • Seven times around the terminal connector

    Correct Answer
    A. Five times around the terminal connector
    Explanation
    To ensure an efficient connection in a wire-wrapped termination, it is necessary to wrap the wire lead at least five times around the terminal connector. This is because wrapping the wire multiple times creates a secure and reliable connection by increasing the contact area between the wire and the terminal. The more wraps there are, the stronger the connection becomes, reducing the risk of the wire coming loose or losing conductivity. Therefore, wrapping the wire five times around the terminal connector is the recommended practice for achieving an efficient connection.

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  • 32. 

    screw-con connectors are generally unreliable because they

    • Are hard to install properly

    • Can be pulled off with relative ease

    • Can create poor network connections

    • Can easily break the center conductor during the install

    Correct Answer
    A. Can be pulled off with relative ease
    Explanation
    Screw-on connectors can be pulled off with relative ease, making them generally unreliable. This means that they may not provide a secure and stable connection, which can lead to poor network connections. Additionally, the ease with which they can be pulled off increases the risk of breaking the center conductor during installation, further compromising their reliability.

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  • 33. 

    We can express the 6-to-1 improvement of the single-sideband suppressed carrier (SSBSC) modulation over conventional amplitude modulation (AM) as

    • 2 decibels (dB) of improvement

    • 4 dB of improvement

    • 6 dB of improvement

    • 8 dB of improvement

    Correct Answer
    A. 8 dB of improvement
    Explanation
    The 6-to-1 improvement of the single-sideband suppressed carrier (SSBSC) modulation over conventional amplitude modulation (AM) can be expressed as 8 dB of improvement.

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  • 34. 

    what unit is most commonly used in data systems to express signaling speed?

    • Baud

    • Baudot

    • Sense interface

    • Bits per second

    Correct Answer
    A. Bits per second
    Explanation
    The most commonly used unit in data systems to express signaling speed is bits per second. This unit measures the number of bits that can be transmitted or processed in one second. Baud is a unit that measures the number of signal changes per second, while Baudot is a character encoding scheme. Sense interface is not a unit of measurement for signaling speed.

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  • 35. 

    the purpose of a multimeter is to

    • Provide wiring maps at both ends of the cable

    • Monitor and provide access to multiple conductors

    • Measure electrical voltage, current, frequency, and resistance

    • Locate sheath faults, damage conductors, splices, bridge taps, and split pairs

    Correct Answer
    A. Measure electrical voltage, current, frequency, and resistance
    Explanation
    A multimeter is a versatile tool used to measure various electrical parameters such as voltage, current, frequency, and resistance. It provides accurate readings for these parameters, allowing users to troubleshoot electrical circuits, test components, and ensure proper functioning of electrical systems. By measuring these parameters, the multimeter helps in diagnosing electrical issues, determining the health of electrical components, and ensuring the safety and efficiency of electrical systems.

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  • 36. 

    Amplitude modulation (AM) requires a bandwidth that is

    • Twice that of the modulating signal.

    • Half that of the modulating signal

    • Twice that of the carrier signal

    • Half that of the carrier signal.

    Correct Answer
    A. Twice that of the modulating signal.
    Explanation
    Amplitude modulation (AM) requires a bandwidth that is twice that of the modulating signal because in AM, the amplitude of the carrier signal is varied in proportion to the modulating signal. This variation in amplitude results in sidebands being created around the carrier frequency, which contain the modulating signal information. The bandwidth required to transmit these sidebands is directly related to the frequency range of the modulating signal, hence it needs to be twice the frequency range of the modulating signal.

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  • 37. 

    A modulation waveform that contains a carrier plus two sidebands for each modulation frequency is a description of

    • A phase modulation (PM)

    • A pulse modulation

    • A frequency modulation (FM)

    • An amplitude modulation (AM)

    Correct Answer
    A. An amplitude modulation (AM)
    Explanation
    An amplitude modulation (AM) is a modulation waveform that contains a carrier plus two sidebands for each modulation frequency. In AM, the amplitude of the carrier signal is varied in proportion to the instantaneous amplitude of the modulating signal. This results in the carrier signal being modulated to produce two sidebands, one above and one below the carrier frequency. Therefore, an AM waveform contains a carrier plus two sidebands for each modulation frequency.

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  • 38. 

    Quantized analog modulation is actually

    • Pulse-amplitude modulation (PAM)

    • Pulse-duration modulation (PDM)

    • Less tolerant of noise than frequency modulation (FM)

    • Analog-to-digital conversion

    Correct Answer
    A. Analog-to-digital conversion
    Explanation
    Quantized analog modulation refers to the process of converting analog signals into digital signals. This involves dividing the continuous analog signal into discrete levels or steps, which are then represented by digital values. This conversion allows for more efficient transmission and storage of the signal, as digital signals are less susceptible to noise and interference compared to analog signals. Therefore, quantized analog modulation is essentially analog-to-digital conversion.

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  • 39. 

    noise in delta modulation (DM) can be reduced by varying the approximation signal step size in accordance with the input signal’s

    • Speed

    • Phase

    • Amplitude

    • Frequency

    Correct Answer
    A. Amplitude
    Explanation
    In delta modulation (DM), noise can be reduced by varying the approximation signal step size in accordance with the input signal's amplitude. By adjusting the step size based on the amplitude of the input signal, the delta modulation system can better track the changes in the signal and reduce the error or noise introduced during the approximation process. This allows for a more accurate representation of the original signal and improves the overall quality of the delta modulation system.

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  • 40. 

    The accepted standard for the voice frequency band is

    • 300 to 1,600 hertz (Hz)

    • 300 to 2,600 Hz

    • 300 to 3,400 Hz

    • 300 to 3,800 Hz

    Correct Answer
    A. 300 to 3,400 Hz
    Explanation
    The accepted standard for the voice frequency band is 300 to 3,400 Hz. This range encompasses the frequencies at which human voices typically produce sound. Frequencies below 300 Hz are generally considered to be in the lower range and may be associated with deeper voices or certain musical instruments. Frequencies above 3,400 Hz are in the higher range and may include higher pitched voices or certain sound effects. Therefore, the range of 300 to 3,400 Hz covers the majority of frequencies at which human voices are heard.

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  • 41. 

    the signaling equipment has three types of communications signals that act as functions to

    • Process switch addressing

    • Control digit translation

    • Control and process calls

    • Provide a clear signal

    Correct Answer
    A. Control and process calls
    Explanation
    The signaling equipment has three types of communication signals that are used to control and process calls. These signals are responsible for managing the addressing of switches, translating digits, and ensuring that calls are properly controlled and processed. Additionally, these signals are designed to provide a clear signal for effective communication.

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  • 42. 

    what common channel signaling (CCS) signaling mode transfers the messages relating to signaling between two points are conveyed directly interconnecting these signaling points

    • Associated mode

    • Nonassociated mode

    • Quasi-associated mode

    • Multi-associated mode

    Correct Answer
    A. Associated mode
    Explanation
    Associated mode of common channel signaling (CCS) transfers the messages relating to signaling between two points by directly interconnecting these signaling points. This means that the signaling messages are sent directly from one signaling point to another without any intermediate nodes or network elements. In associated mode, the signaling points have a direct link or connection, allowing for efficient and reliable transfer of signaling messages. This mode is often used in scenarios where there is a dedicated and stable connection between the signaling points, ensuring the timely and accurate delivery of signaling information.

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  • 43. 

    why are wire pairs twisted together with other pairs to form a twisted pair cable

    • To induce an equal amount of current flows in the outer conductor

    • To cancel out induced signals that can interfere with the communication signals

    • To prevent electrostatic fields from emitting outside its shield

    • Too add strength to the cable

    Correct Answer
    A. To cancel out induced signals that can interfere with the communication signals
    Explanation
    The wire pairs are twisted together with other pairs to form a twisted pair cable in order to cancel out induced signals that can interfere with the communication signals. By twisting the pairs, any external electromagnetic interference is evenly distributed across the wires, resulting in equal and opposite induced currents. This cancellation effect helps to minimize the impact of external signals and ensures clearer communication signals.

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  • 44. 

    what tool(s) are required to complete a punch-on terminal connection

    • 714B quick-connect tool only

    • Soldering iron and wire strippers

    • 714B quick-connect tool and wire strippers

    • 714B quick-connect tool and soldering iron

    Correct Answer
    A. 714B quick-connect tool only
    Explanation
    To complete a punch-on terminal connection, the only tool required is the 714B quick-connect tool. This tool is specifically designed for making quick and secure connections to punch-on terminals. It eliminates the need for soldering or wire strippers, making the process more efficient and convenient.

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  • 45. 

    what are the three sections of fiber optic cable called

    • Core, cladding, and shield

    • Core, cladding, and jacket

    • Core, conductor, and shield

    • Core, conductor, and jacket

    Correct Answer
    A. Core, cladding, and jacket
    Explanation
    The three sections of a fiber optic cable are called the core, cladding, and jacket. The core is the innermost part of the cable where the light signal travels. The cladding surrounds the core and helps to keep the light signal contained within the core by reflecting it back into the core when it tries to escape. The jacket is the outermost layer of the cable and provides protection and insulation for the core and cladding.

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  • 46. 

    Before checking for shorts on a base cable pair

    • Loop the other end of the cable pair

    • Remove all patch cords from the patch panel

    • Disconnect the other end from the communication device

    • Ensure that the protection modules are removed from the wire frame

    Correct Answer
    A. Disconnect the other end from the communication device
    Explanation
    To ensure accurate testing for shorts on a base cable pair, it is necessary to disconnect the other end of the cable from the communication device. This step is important because it eliminates any potential interference or signal disruption that could be caused by the connected device. By disconnecting the other end, the cable pair can be tested independently and any shorts or faults can be accurately identified without any external factors affecting the results.

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  • 47. 

    what communications control signal uses a two frequency dialing combination

    • Pulse dialing

    • Tone dialing

    • digit dialing

    • Address dialing

    Correct Answer
    A. Tone dialing
    Explanation
    Tone dialing is the correct answer because it uses a two-frequency dialing combination to send signals during phone calls. In tone dialing, each number on the telephone keypad is associated with a specific tone consisting of two distinct frequencies. When a number is dialed, the corresponding tones are transmitted over the phone line to indicate the desired number. This method is more reliable and faster than pulse dialing, which uses a series of electrical pulses to represent numbers. Digit dialing and address dialing are not specific communication control signals and do not involve a two-frequency combination.

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  • 48. 

    what is indicated by an interruption that results in an incomplete

    • Transient voltage

    • Foreign battery

    • Short

    • Open

    Correct Answer
    A. Open
    Explanation
    An interruption that results in an incomplete transient voltage is indicated by an open circuit. An open circuit occurs when there is a break or discontinuity in the electrical path, causing the flow of current to be interrupted. In this case, the interruption prevents the transient voltage from completing its intended path, resulting in an incomplete voltage.

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  • 49. 

    The amount of phase shift in a phase modulation (PM) signal is directly proportional to the

    • Modulation index

    • Rate of phase shift

    • Frequency of the modulating signal

    • Amplitude of the modulating signal

    Correct Answer
    A. Amplitude of the modulating signal
    Explanation
    The amount of phase shift in a phase modulation (PM) signal is directly proportional to the amplitude of the modulating signal. This means that as the amplitude of the modulating signal increases, the phase shift in the PM signal also increases. Phase modulation is a type of modulation where the phase of the carrier signal is varied in accordance with the modulating signal. The amplitude of the modulating signal determines the extent to which the phase of the carrier signal is shifted, resulting in a change in the phase of the PM signal.

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Quiz Review Timeline (Updated): Jul 9, 2024 +

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  • Current Version
  • Jul 09, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 15, 2010
    Quiz Created by
    Cat89
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