Vol1 Ure1 CDC 3D153

37 Questions | Attempts: 79
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  • 1/37 Questions

    (002) If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator, the output signal include

    • 1.01 MHz, 1 MHz, and 0.99 MHz.
    • 1.1 MHz, 1 MHz, and 0.9 MHz.
    • 1.11 MHz, 1 MHz, 0.99 MHz.
    • 1.111 MHz, 1 MHz, 0.999 MHz
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About This Quiz

This is a quiz for URE1 Volume 1 for AFSC 3D153 CDC's. This is to be used as a study aid.

CDC Quizzes & Trivia

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  • 2. 

    (001) What reason for modulation involves modulating low frequency signals for transmission over long distances?

    • Spectrum conservation

    • Channel Allocation

    • Ease of Radiation

    • Companding

    Correct Answer
    A. Ease of Radiation
  • 3. 

    (002) The amount of effect or change that the intelligence has on the carrier in an amplitude modulated signal is expressed as the?

    • Percent of modulation

    • Modulation index.

    • Bandwidth

    • Deviation

    Correct Answer
    A. Percent of modulation
  • 4. 

    (001) What are the three general categories used to produce modulation in radio frequency (RF) transmission today?

    • Binary amplitude shift keying, frequency shift keying, and phase shift keying.

    • Pulse amplitude, pulse width, and pulse position.

    • Amplitude, frequency, and phase.

    • Analog, digital and shift keying.

    Correct Answer
    A. Amplitude, frequency, and phase.
  • 5. 

    (008) What type of light is emitted from a laser?

    • Incoherent

    • Coherent

    • Ordinary

    • Invisible

    Correct Answer
    A. Coherent
  • 6. 

    (002) The bandwidth of an amplitude modulated signal is?

    • Two times the modulating signal

    • The same as the modulating signal

    • Determined by the modulation index.

    • Defined in terms of maximum amount of modulation

    Correct Answer
    A. Two times the modulating signal
  • 7. 

    (002) If the modulating audio signal is 10 kHz wide, what is the bandwidth of the transmitted amplitude modulated signal?

    • 5kHz

    • 10kHz

    • 15kHz

    • 20kHz

    Correct Answer
    A. 20kHz
  • 8. 

    (003) What is the formula to find the modulating index?

    • Deviation divided by frequency of modulation

    • Deviation times frequency of modulation

    • Sideband divide by carrier frequency

    • Sideband times carrier frequency

    Correct Answer
    A. Deviation divided by frequency of modulation
  • 9. 

    (005) What part of the pulse code modulation (PCM) process converts a continuous time signal into a discrete time signal?

    • Sampling

    • Rectifying

    • Oscillating

    • Band limiting

    Correct Answer
    A. Sampling
  • 10. 

    (005) A type of pulse modulation (PM) that changes the amplitude of the pulse train to vary according to the amplitude of the input signal is called?

    • Pulse width modulation (PWM).

    • Pulse position modulation

    • Pulse duration modulation

    • Pulse amplitude modulation

    Correct Answer
    A. Pulse amplitude modulation
  • 11. 

    (010) What is used to extend the distance of a fiber optic communication systems link?

    • Receiver

    • Transmitter

    • Repeater

    • Patch cords

    Correct Answer
    A. Repeater
  • 12. 

    (002) When the modulating signal and carrier signal are combined within a modulator, the output signal contains a/an

    • Modulating signal, upper sideband, lower sideband

    • Carrier, upper sideband, and lower sideband

    • Upper sideband and modulating signal

    • Carrier and modulating signal.

    Correct Answer
    A. Carrier, upper sideband, and lower sideband
  • 13. 

    (002) Which statement concerning bandwidth is true?

    • Overmodulating increases bandwidth due to the production of harmonics

    • Undermodulating increases bandwidth due to the production of harmonics

    • Overmodulating increases bandwidth due to the output’s increased amplitude

    • Undermodulating increases bandwidth due to the output’s decreased amplitude

    Correct Answer
    A. Overmodulating increases bandwidth due to the production of harmonics
  • 14. 

    (008) Laser diode power coupling is measured in which range?

    • Megawatt

    • Microwatt

    • Milliwatt

    • Kilowatt

    Correct Answer
    A. Milliwatt
  • 15. 

    (003) In frequency modulation (FM), what is considered a significant sideband?

    • Sidebands containing at least 1 percent of the total transmitted power

    • Sidebands containing at least 3 percent of the total transmitted power

    • Sidebands containing at least 10 percent of the total transmitted power

    • Sidebands containing at least 0.1 percent of the total transmitted power

    Correct Answer
    A. Sidebands containing at least 1 percent of the total transmitted power
  • 16. 

    (007) When using forward error control as a method of error correction, where does error correction take place?

    • Receiving end.

    • In the oscillator

    • Transmitting end.

    • In the primary buffers

    Correct Answer
    A. Receiving end.
  • 17. 

    (009) What photo detector converts one photon to one electron?

    • Light emitting diode (LED)

    • Avalanche photodiode

    • Positive intrinsic negative (PIN) diode

    • Integrated phtodiode/preamplifier (IDP)

    Correct Answer
    A. Positive intrinsic negative (PIN) diode
  • 18. 

    (007) When using vertical redundancy check (VRC), what significance does the amount of ones have in a data bit pattern?

    • Determines parity

    • Determines transmission rate

    • Determines whether transmission is in American Standard code for Information Interchange (ASCII) format

    • Determines whether transmission is synchronous or asynchronous

    Correct Answer
    A. Determines parity
  • 19. 

    (007) What error detection method adds stacked characters, divides it by 255, and disregards the answer except for the remainder?

    • Checksum

    • Block check character

    • Redundant data transfer

    • Automatic retransmit on request

    Correct Answer
    A. Checksum
  • 20. 

    (008) What does an optical source do?

    • Terminates fiber optics cable

    • Converts electrical energy into optical energy

    • Extend the distance and to preserve signal integrity

    • Accepts optical signals and converts them into electrical signals

    Correct Answer
    A. Converts electrical energy into optical energy
  • 21. 

    (008) Light sources that are applicable to fiber optic waveguide are light-emitting diodes (LED) and?

    • Photo transistors.

    • Hybrid photodiodes

    • Semiconductor laser diodes

    • Integrated photodiode/preamplifiers

    Correct Answer
    A. Semiconductor laser diodes
  • 22. 

    (009) Small current that flows from a photodiode even with no light is called?

    • Dark current

    • Dispersion

    • Distortion

    • Ionization

    Correct Answer
    A. Dark current
  • 23. 

    (010) Which repeater amplifies optical signal without converting to and from the electrical domain?

    • Repeaters

    • Regenerators

    • Optical Amplifiers

    • Receiver

    Correct Answer
    A. Optical Amplifiers
  • 24. 

    (011) Which fiber-optic connector uses quick-release, keyed bayonet couplings that are preferred in situations where severe vibrations are not expected?

    • Biconic

    • Field connector (FC)

    • Straight tip (ST)

    • Sub-miniature, type A (SMA)

    Correct Answer
    A. Straight tip (ST)
  • 25. 

    (004) In phase modulation (PM), the carrier’s?

    • Phase is shifted at the rate of the modulating signal

    • Phase shifted with the phase of the modulating signal

    • Amplitude is shifted at the rate of the modulating signal

    • Amplitude is shifted with the phase of the modulating signal

    Correct Answer
    A. Phase is shifted at the rate of the modulating signal
  • 26. 

    (002) Reducing modulation to less than 100 percent gives?

    • More total power

    • A reduction in carrier power

    • No reduction in carrier power

    • A reduction in carrier and sideband power

    Correct Answer
    A. No reduction in carrier power
  • 27. 

    (003) In frequency modulation (FM), the amount of oscillator frequency change is?

    • Inversely proportional to the amplitude of the modulating signal.

    • Directly proportional to the amplitude of the modulating signal

    • Inversely proportional to the phase of the modulating signal

    • Directly proportional to the phase of the modulating signal

    Correct Answer
    A. Directly proportional to the amplitude of the modulating signal
  • 28. 

    (005) What is the first step in the pulse code modulation (PCM) process?

    • Discrete amplitudes are assigned to the sampling pulses

    • A binary code number is assigned to the sample

    • The quantizer limits the amplitude of the pulses

    • The analog signal is band-limited

    Correct Answer
    A. The analog signal is band-limited
  • 29. 

    (011) Short sections of single fiber cables that has a connector at each end is called a?

    • Pigtail

    • Patch cord

    • Jumper

    • Breakout cables

    Correct Answer
    A. Patch cord
  • 30. 

    (006) If an error should occur, what data transmission is lost in a synchronous transmission?

    • One Character

    • Block of data

    • A parity bit

    • Synchronization (SYNC) bit

    Correct Answer
    A. Block of data
  • 31. 

    (007) What two error detection methods, when used together, are 98 percent effective in detecting errors?

    • Checksum and cyclic redundancy check

    • Longitudinal redundancy check and checksum

    • Cyclic redundancy check and vertical redundancy check

    • Vertical redundancy check and longitudinal redundancy check

    Correct Answer
    A. Vertical redundancy check and longitudinal redundancy check
  • 32. 

    (004) What is the advantage of adding more phase shifts?

    • Easier detection

    • Smaller bit error rate

    • Better signal-to-noise ratio

    • Higher data rates within a given bandwidth

    Correct Answer
    A. Higher data rates within a given bandwidth
  • 33. 

    (009) The responsivity of a photo detector is dependent on the?

    • Emitter rise time

    • Wavelength of light

    • Signal-to-noise ratio (SNR)

    • Emitter modulation speed

    Correct Answer
    A. Wavelength of light
  • 34. 

    (009) A device that accepts optical signals from an optical fiber and coverts them into electrical signals is called an optical?

    • Regenerator

    • Transmitter

    • Amplifier

    • Receiver

    Correct Answer
    A. Receiver
  • 35. 

    (009) What are the two main types of photodetectors?

    • Positive intrinsic negative and avalanche photodiode

    • Light-emitting diode (LED) and avalanche photodiode

    • LED and semiconductor laser

    • Tunnel and zener diodes

    Correct Answer
    A. Positive intrinsic negative and avalanche photodiode
  • 36. 

    (007) What error-correction technique sends a retransmittal request by the receiver to the sender if it finds an error in a received frame?

    • Error-correcting code

    • Forward error control

    • Redundant data transfer

    • Automatic retransmit on request

    Correct Answer
    A. Automatic retransmit on request
  • 37. 

    (011) Which fiber optic connector uses a push-pull engagement for mating?

    • Biconic

    • Field Connector (FC)

    • Subscriber (SC)

    • Sub-mini, Type A (SMA0

    Correct Answer
    A. Subscriber (SC)

Quiz Review Timeline (Updated): Mar 15, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 15, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 25, 2012
    Quiz Created by
    Jayhuiz23
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