3D1X3 CDC Volume 1 URE
100 Questions I 1059 Attempts I Created By ihatecdc 673 days ago
read the damn title also jones.
Question Excerpt From 3D1X3 CDC Volume 1 URE
| Q.1) |
(001) What reason for modulation involves modulating low frequency signals for transmission over long distances?
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| Q.2) |
(001) What are the three general categories used to produce modulation in radio frequency (RF) transmission today?
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| Q.3) |
(002) When the modulating signal and carrier signal are combined within a modulator, the output signal contains a/an
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| Q.4) |
(002) If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator, the output signal includes
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| Q.5) |
(002) If the modulating audio signal is 10kHz wide, what is the bandwidth of the transmitted amplitude modulated signal?
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| Q.6) |
(002) The bandwidth of an amplitude modulated signal is
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| Q.7) |
(002) The amount of effect or change that the intelligence has on the carrier in an amplitude modulated signal is expressed as the
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| Q.8) |
(002) Which statement concerning bandwidth is true?
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| Q.9) |
(002) Reducing modulation to less than 100 percent gives
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| Q.10) |
(003) In frequency modulation (FM), the amount of oscillator frequency change is
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| Q.11) |
(003) In frequency modulation (FM), what is considered a significant sideband?
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| Q.12) |
(003) What is the formula to find the modulating index?
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| Q.13) |
(004) In phase modulation (PM), the carrier's
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| Q.14) |
(004) What is the advantage of adding more phase shifts?
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| Q.15) |
(005) What is the first step in the pulse code modulation (PCM) process?
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| Q.16) |
(005) What part of the pulse code modulation (PCM) process converts a continuous time signal into a discrete time signal?
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| Q.17) |
(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
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| Q.18) |
(006) If an error should occur, what data transmission is lost in a synchronous transmission?
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| Q.19) |
(007) When using vertical redundancy check (VRC), what significance does the amount of ones have in a data bit pattern?
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| Q.20) |
(007) What two error detection methods, when used together, are 98 perfent effective in detecting errors?
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| Q.21) |
(007) What error detection method adds stacked characters, divides it by 255, and disregards the answer except for the remainder?
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| Q.22) |
(007) What error-correction technique sends a retransmittal request by the receiver to the sender if it finds an error in a received frame?
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| Q.23) |
(007) When using forward error control as a method of error correction, where does error correction take place?
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| Q.24) |
(008) What does an optical source do?
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| Q.25) |
(008) Light sources that are applicable to fiber optic waveguide are light-emitting diodes (LED) and
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| Q.26) |
(008) What type of light is emitted from a laser?
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| Q.27) |
(008) Laser diode power coupling is measured in which range
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| Q.28) |
(009) A device that accepts optical signals from an optical fiber and converts them into electrical signals is called an optical
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| Q.29) |
(009) Small current that flows from a photodiode even with no light is called
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| Q.30) |
(009) The responsivity of a photo detector is dependent on the
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| Q.31) |
(009) What are the two main types of photodetectors?
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| Q.32) |
(009) What photo detector converts one photon to one electron?
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| Q.33) |
(010) What is used to extend the distance of a fiber optic communication systems link?
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| Q.34) |
(010) Which repeater amplifies optical signal without converting to and from the electrical domain?
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| Q.35) |
(011) Short sections of single fiber cables that has a connector at each end is called a
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| Q.36) |
(011) Which fiber-optic connector uses a quick-release, keyed bayonet couplings that are preferred in situations where severe vibrations are not expected?
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| Q.37) |
(011) Which fiber optic connector uses a push-pull engagement for mating? |
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| Q.38) |
(012) What initial nuclear radiation elements generate electromagnetic pulses?
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| Q.39) |
(012) High-altitude electromagnetic pulse is what type of frequency phenomenon, and involces which frequency range?
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| Q.40) |
(012) A system-generated electromagnetic pulse is a problem for satellites and reentry vehicles that are
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| Q.41) |
(012) Which distinct region of the source region electromagnetic pulse is produced by the interactions between the weapon products and the earth's atmosphere? |
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| Q.42) |
(012) What electromagnetic pulse region is the principal threat to electronic systems by cable?
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| Q.43) |
(012) How does scintillation effect communications?
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| Q.44) |
(012) Atmospheric disturbances from initial nuclear radiation on higher frequencies affect comunications by which types of effects?
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| Q.45) |
(013) Which one of the following statements are true converning shielding?
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| Q.46) |
(013) What is the purpose of bonding?
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| Q.47) |
(013) Which types of filters are always used in combination with surge arresters?
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| Q.48) |
(014) If the interference can be eliminated by disconnecting the receiving antenna, the source of the disturbance is most likely
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| Q.49) |
(014) What is an example of intentionally induced electromagnetic interference (EMI)?
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| Q.50) |
(014) What type of electromagnetic interference (EMI) occurs when a receiver responds to off-frequency signals?
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| Q.51) |
(014) What type of equipment often generates many spurious emissions?
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| Q.52) |
(014) What man-made noise results from voltage surges, arcing, or corona discharges?
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| Q.53) |
(014) How can you normally eliminate electromagnetic interference (EMI) noise bursts caused by sodium and mercurt vapor lights that have stopped working while the power is still applied?
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| Q.54) |
(015) What Air Force program is used to resolve an electromagnetic interference (EMI) incident?
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| Q.55) |
(015) At what level does the Air Force want electromagnetic interference (EMI) problems resolved?
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| Q.56) |
(015) What is the first step in the Air Force spectrum interference resolution (SIR) program?
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| Q.57) |
(015) What do you do when you are reasonably sure electromagnetic interference (EMI) exists?
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| Q.58) |
(015) Who is initially responsible for reporting an electromagnetic interference (EMI)? |
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| Q.59) |
(015) Which Air Force service provides on-site direction finding and interference problem analysis?
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| Q.60) |
(015) What program addresses persistent and recurring interferences problems in joint operations?
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| Q.61) |
(015) Who is tasked to provide interference resolution support to the unified commanders?
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| Q.62) |
(016) Which feature of the Fluke 8025A locks the measurement into the display for viewing and automatically updates the display when you take a new measurement?
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| Q.63) |
(017) Which current range on the Fluke 8025A do you select to measure 250 milliamps alternating current (AC)?
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| Q.64) |
(017) When testing a diode with the 8025A, the leads across a "good" diode produces an "OL" (open) on the display in one direction while reversing the leads produces
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| Q.65) |
(018) How are voltage, time, and depth represented on the oscilloscope display?
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| Q.66) |
(018) Which mode of triggering an oscilloscope causes a trace to be drawn on the screen at all times, whether there is an input signal or not?
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| Q.67) |
(019) Which probe does not need to actually make contact with the circuit under test?
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| Q.68) |
(020) What digital storage oscilloscope circuit compensates for high sampling rates of high frequency signals?
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| Q.69) |
(020) Sampled data points are stored in the memory of a digital storage oscilloscope as
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| Q.70) |
(020) What area of a digital storage oscilloscope takes digitized samples and performs numberous manipulations on the data including measuring rise and fall times, periods, time intervals, and math computations?
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| Q.71) |
(020) What type of sampling does a digital storage oscilloscope normally use on single-shot or seldom-occurring signals?
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| Q.72) |
(020) In real-time sampling, what type of interpolation is used when measuring pulse waves?
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| Q.73) |
(020) Which are the three types of digital storage oscilloscope acquisition modes, and which is the standard operating mode?
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| Q.74) |
(020) In acquiring a 4K record length on a digital storage oscilloscope, how many samples can you view at one time?
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| Q.75) |
(021) What test equipment provides a bit error detection system that can determine the received data quality after traveling over a communications link?
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| Q.76) |
(021) What pattern simulator section of the bit error rate test set accepts a 480bit parallel word and generates a serial pattern?
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| Q.77) |
(021) What pattern simulator section of the bit error rate test set converts the non-return zero-level (NRZ-L) data into the desired coding, such as non-return zero-mark (NRZ-M)?
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| Q.78) |
(021) What pattern synchronizer and error counter section of the bit error rate test set internally generates its own pattern to compare with the received data from the data/clock receivers?
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| Q.79) |
(022) Which of these bit rates do you use for a bit error rate test on a 64 Kbps data circuit?
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| Q.80) |
(022) On the bit error rate test (BER) set, the 25-pin connector are designed to operate with data modems to
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| Q.81) |
(023) System grounds must continually be tested
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| Q.82) |
(024) A known current is generated by the earth ground tester between the earth ground electrode and the
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| Q.83) |
(024) Where is voltage potential measured in the fall of potential ground testing method?
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| Q.84) |
(024) The Institute of Electrical and Electronics Engineers (IEEE) have recommended a ground resistance value of
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| Q.85) |
(025) What component on a protocol analyzer process the frames based on the selected test and user configuration inputs?
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| Q.86) |
(025) What protocol analyzer test window provides information concerning the network utilization and frame error that are related to a specific protocol?
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| Q.87) |
(025) What protocol analyzer test window reports errors that occur at the physical layer such as bad frame check sequence (FCS), short frames, and jabbers?
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| Q.88) |
(025) What active test is selected to see the path that the packets are traveling and the time it takes the packets to compete the trip?
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| Q.89) |
(026) Which one of these is not an application of a radio frequency (RF) generator?
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| Q.90) |
(027) A power reading that uses the abbreviation dBm indicates the
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| Q.91) |
(028) During what operation is the radio frequency blanking output used on the HP 436A power meter?
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| Q.92) |
(029) Plug-in elements of the wattmeter are selected based on the
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| Q.93) |
(029) The two switches on the front panel of the wattmeter is to correstpond to the
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| Q.94) |
(029) When reading forward power on a wattmeter, what does two right facing arrow head mean?
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| Q.95) |
(029) What feature is useful for making adjustments to optimize any of the parameters which the wattmeter measures?
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| Q.96) |
(030) Which measurements are not made with a spectrum analyzer?
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| Q.97) |
(031) Which are the correct four classes of electronic counters?
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| Q.98) |
(032) What test equipment combines the operations of many test instruments in a single compact unit?
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| Q.99) |
(032) What function is not part of the communication service monitor?
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| Q.100) |
(033) What operational capability of the communication service monitor produces sine, square, and triangle waveforms?
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