3D153 CDC, Volume 1. General Subjects

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  • 1/100 Questions

    015 - Who is initially responsible for reporting an electromagnetic interference (EMI)?

    • The operator.
    • Major command (MAJCOM)
    • Federal communications commission (FCC)
    • The frequency manager (FM)
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About This Quiz


3D153-01-1009, Edit Code 01
This quiz is to help new Airmen study for their CDCs and for Senior Airmen to study for Staff. This quiz is made up by all the UREs from the first 3D153 CDC volume.
Edited and updated as of December 16, 2012
If you have find an error on a question you can email me at cfloyd8890@gmail. See moreCom
and I will fix it!

3D153 CDC, Volume 1. General Subjects - Quiz

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  • 2. 

    001 - What are the three genereal 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.
    Explanation
    The three general categories used to produce modulation in radio frequency (RF) transmission today are amplitude, frequency, and phase. Amplitude modulation (AM) involves varying the strength of the RF signal. Frequency modulation (FM) involves varying the frequency of the RF signal. Phase modulation (PM) involves varying the phase of the RF signal. These three categories are commonly used in RF transmission to encode and transmit information.

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  • 3. 

    014 - What is an example of intentionally induced electromagnetic interference (EMI)?

    • Spurious responses.

    • Jamming.

    • Power line noise.

    • Intermodulation.

    Correct Answer
    A. Jamming.
    Explanation
    Jamming is an example of intentionally induced electromagnetic interference (EMI). Jamming refers to the deliberate transmission of signals or noise on specific frequencies to disrupt or interfere with the normal functioning of electronic devices or communication systems. It is often used in military operations to disrupt enemy communications or radar systems.

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  • 4. 

    002 - If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator the output signal includes

    • 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, .0999 MHz

    Correct Answer
    A. 1.01 MHz, 1 MHz, and 0.99 MHz.
    Explanation
    When a carrier frequency of 1 MHz and a modulating tone of 10 kHz go to the modulator, the output signal includes the sum and difference frequencies of the carrier and modulating tone. The sum frequency is obtained by adding the carrier frequency and the modulating tone frequency, resulting in 1.01 MHz. The carrier frequency itself remains unchanged at 1 MHz. The difference frequency is obtained by subtracting the modulating tone frequency from the carrier frequency, resulting in 0.99 MHz. Therefore, the correct answer is 1.01 MHz, 1 MHz, and 0.99 MHz.

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  • 5. 

    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
    Explanation
    The correct answer is "two times the modulating signal." In amplitude modulation, the bandwidth refers to the range of frequencies required to transmit the modulated signal. Since the modulating signal is responsible for creating the variations in the carrier signal, the bandwidth needs to be wide enough to accommodate these variations. In amplitude modulation, the bandwidth is directly proportional to the frequency of the modulating signal. Therefore, the bandwidth is two times the modulating signal frequency.

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  • 6. 

    003 - In FM, what is considered a significant sideband?

    • Sibebands (SB) containing at least 1% of the total transmitted power

    • SB containing at least 3% of the total transmitted power

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

    • SB containing at least 0.1% of the total transmitted power

    Correct Answer
    A. Sibebands (SB) containing at least 1% of the total transmitted power
    Explanation
    A significant sideband in FM is considered to be one that contains at least 1% of the total transmitted power. This means that the sideband carries a substantial amount of the signal and is not negligible in terms of power.

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  • 7. 

    (017) Which current range on the Fluke 8025A do you select to measure 250 milliamps alternating current (AC)?

    • Milliamps/amp AC.

    • Microamps (DC).

    • Microamps AC.

    • Milliamps/amp DC.

    Correct Answer
    A. Milliamps/amp AC.
    Explanation
    To measure 250 milliamps alternating current (AC) on the Fluke 8025A, you would select the "Milliamps/amp AC" current range. This range is specifically designed for measuring alternating current in milliamps.

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  • 8. 

    014 - How can you normally eliminate electromagnetic interference (EMI) noise bursts caused by sodium and mercury vapor light that have stopped working while the power is still applied?

    • Install a noise reject filter on the receiver.

    • Change the bulb.

    • Ground out the light fixture.

    • Install a noise reject filter on the light.

    Correct Answer
    A. Change the bulb.
    Explanation
    When sodium and mercury vapor lights stop working, they can cause electromagnetic interference (EMI) noise bursts. These noise bursts can be eliminated by changing the bulb. By replacing the faulty bulb with a new one, the source of the EMI noise bursts is removed, and the interference is eliminated. Other options such as installing a noise reject filter on the receiver or the light, or grounding out the light fixture, may not effectively address the issue of EMI noise caused by the malfunctioning bulb.

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  • 9. 

    (023) System grounds MUST continually be tested

    • Randomly.

    • Periodically.

    • Every 10 years.

    • Just one time only.

    Correct Answer
    A. Periodically.
    Explanation
    System grounds must be continually tested periodically to ensure that they are functioning properly. Grounding systems can deteriorate over time due to various factors such as corrosion, moisture, and physical damage. Therefore, regular testing is necessary to identify any issues and make necessary repairs or replacements. Random testing or testing only once may not provide a comprehensive assessment of the grounding system's condition, while testing every 10 years may not be frequent enough to catch potential problems in a timely manner.

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  • 10. 

    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
    Explanation
    Modulating low frequency signals for transmission over long distances is done to ensure ease of radiation. This means that by modulating the signals, they can be efficiently transmitted and propagated through the air or any other medium. This modulation process allows for better reception and reduces the chances of signal loss or degradation during long-distance transmission.

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  • 11. 

    005 - A type of pulse modulation (PM) that causes 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 (PPM)

    • Pulse duration modulation (PDM)

    • Pulse amplitude modulation (PAM)

    Correct Answer
    A. Pulse amplitude modulation (PAM)
    Explanation
    Pulse amplitude modulation (PAM) is a type of pulse modulation where the amplitude of the pulse train varies according to the amplitude of the input signal. In PAM, the amplitude of the pulses represents the information being transmitted. This modulation technique is commonly used in analog communication systems to transmit analog signals over a digital medium. PAM is different from other types of pulse modulation such as pulse width modulation (PWM), pulse position modulation (PPM), and pulse duration modulation (PDM) which modulate the width, position, or duration of the pulses respectively.

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  • 12. 

    012 - What initial nuclear radiation elements generate electromagnetic pulses?

    • Gamma rays and neutrons.

    • Thermally generated x-rays.

    • Transient radiation effects on electronics.

    • Neutrons and thermally generated x-rays.

    Correct Answer
    A. Gamma rays and neutrons.
    Explanation
    Gamma rays and neutrons are the initial nuclear radiation elements that generate electromagnetic pulses. Gamma rays are high-energy photons that are emitted during nuclear reactions, while neutrons are subatomic particles that are also released in nuclear reactions. Both gamma rays and neutrons can cause ionization and excitation of atoms and molecules, leading to the generation of electromagnetic pulses. Thermally generated x-rays and transient radiation effects on electronics are not initial nuclear radiation elements, and they do not directly generate electromagnetic pulses.

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  • 13. 

    015 - At what level does the air force want electromagnetic interference (EMI) problems resolved?

    • Affected unit.

    • Spectrum interference resolution office.

    • Affected major command.

    • Electromagnetic environmental office.

    Correct Answer
    A. Affected unit.
    Explanation
    The correct answer is "Affected unit." The air force wants electromagnetic interference (EMI) problems resolved at the level of the affected unit. This means that the responsibility for resolving EMI problems lies with the specific unit that is experiencing the interference. The affected unit is expected to take the necessary steps to identify and address the EMI issues within their operations. This approach allows for a more efficient and targeted resolution of EMI problems, as it places the responsibility on the unit directly affected by the interference.

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  • 14. 

    (021) What test equipment provides a bit error detection system that can determine the received data quality after traveling over a communications link?

    • Megger.

    • Multimeter.

    • Oscilloscope.

    • Bit Error Rate Test Set (BER).

    Correct Answer
    A. Bit Error Rate Test Set (BER).
    Explanation
    A Bit Error Rate Test Set (BER) is a test equipment that provides a bit error detection system. It is specifically designed to determine the quality of received data after traveling over a communications link. The BER test set measures the number of bit errors that occur in a given amount of data transmitted over a communication link, allowing for the evaluation of the link's performance and the detection of any errors or issues.

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  • 15. 

    008 - What type of light is emitted from a laser?

    • Incoherent

    • Coherent

    • Ordinary

    • Invisible

    Correct Answer
    A. Coherent
    Explanation
    A laser emits coherent light. Coherent light is characterized by its single wavelength and phase, meaning that all the light waves are in sync with each other. This is achieved through a process called stimulated emission, where photons are emitted in the same direction and with the same frequency and phase. This coherence allows laser light to be focused into a tight beam and to maintain its intensity over long distances.

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  • 16. 

    013 - What is the purpose of bonding?

    • To ensure a mechanically strong, low impedance interconnection between metal objects.

    • To eliminate harmful differences of potential between the various telephone cables entering facility.

    • To reduce interference coupling around circuits and around interconnecting lines.

    • To isolate facility from any external electrical electromagnetic propagation.

    Correct Answer
    A. To ensure a mechanically strong, low impedance interconnection between metal objects.
    Explanation
    Bonding is the process of creating a connection between metal objects to ensure a mechanically strong, low impedance interconnection. This helps to prevent any potential differences between the objects and reduces interference coupling around circuits and interconnecting lines. Bonding also helps to isolate the facility from any external electrical electromagnetic propagation.

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  • 17. 

    015 - What air force program is used to resolve an electromagnetic interference (EMI) incident?

    • Mishap prevention.

    • Frequency management (FM).

    • Electro Static Discharge (ESD) control.

    • AF Spectrum Interference Resolution (AFSIR).

    Correct Answer
    A. AF Spectrum Interference Resolution (AFSIR).
    Explanation
    AF Spectrum Interference Resolution (AFSIR) is the correct answer because it specifically addresses resolving electromagnetic interference (EMI) incidents in the air force. Mishap prevention, frequency management (FM), and electro static discharge (ESD) control are not directly related to resolving EMI incidents.

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  • 18. 

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

    • Receiver.

    • Transmitter.

    • Repeater.

    • Patch cords.

    Correct Answer
    A. Repeater.
    Explanation
    A repeater is used to extend the distance of a fiber optic communication system's link. A repeater receives the signal from the transmitter, amplifies it, and then retransmits it, allowing the signal to travel further without degradation. This is necessary because fiber optic signals can weaken over long distances, and a repeater helps to maintain the signal strength and quality. Patch cords are used to connect devices, but they do not extend the distance of the communication link.

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  • 19. 

    011 - Which fiber-optic connector uses a 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).
    Explanation
    The Straight Tip (ST) fiber-optic connector uses quick-release, keyed bayonet couplings that are preferred in situations where severe vibrations are not expected. This connector provides a secure and reliable connection, while still allowing for easy installation and removal. The design of the ST connector ensures that it remains firmly connected even in environments with minimal vibrations, making it a suitable choice for applications where stability is important.

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  • 20. 

    (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

    • Three short beeps.

    • A continuous audible tone.

    • “SL” (short) on the display.

    • A wavering audible tone.

    Correct Answer
    A. A continuous audible tone.
    Explanation
    When testing a diode with the 8025A, if the leads across a "good" diode produce a continuous audible tone, it indicates that the diode is functioning properly. This is because a diode allows current to flow in only one direction, so when the leads are connected in the correct polarity, the diode conducts and the meter produces a continuous tone. Reversing the leads would result in no current flow and therefore no tone.

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  • 21. 

    (022) Which of these bit rates do you use for a BER test on a 64 Kbps data circuit?

    • 511 bps.

    • 9.600 bps.

    • 64 Kbps.

    • 1.544 Mbps.

    Correct Answer
    A. 64 Kbps.
    Explanation
    A BER (Bit Error Rate) test is used to measure the quality of a digital communication channel by determining the percentage of bits that are received incorrectly. In this question, the correct answer is 64 Kbps because it is the same bit rate as the data circuit being tested. The other options, 511 bps, 9.600 bps, and 1.544 Mbps, are not the correct bit rates for the specific test being performed on a 64 Kbps data circuit.

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  • 22. 

    003 - What is the formula to find the modulating index?

    • Deviation divided by frequency of modulation.

    • Deviation time frequency of modulation.

    • Sideband divided by carrier frequency.

    • Sideband times carrier frequency.

    Correct Answer
    A. Deviation divided by frequency of modulation.
    Explanation
    The modulating index is a measure of how much the carrier wave is modulated by the input signal. It is calculated by dividing the deviation (the maximum change in frequency or amplitude from the carrier wave) by the frequency of modulation (the frequency of the input signal). This formula allows us to determine the extent of modulation in a given system.

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  • 23. 

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

    • 5 kHz

    • 10 kHz

    • 15 kHz

    • 20 kHz

    Correct Answer
    A. 20 kHz
    Explanation
    The bandwidth of an amplitude modulated signal is determined by the sum of the highest frequency component of the modulating signal and the carrier frequency. In this case, the modulating audio signal is 10 kHz wide, so the highest frequency component is 10 kHz. If the carrier frequency is also 10 kHz, then the bandwidth would be 20 kHz.

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  • 24. 

    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
    Explanation
    The amount of ones in a data bit pattern when using vertical redundancy check (VRC) determines parity. Parity is a form of error checking where an extra bit is added to a data transmission to ensure that the number of ones in the transmission is always either even or odd. By checking the parity bit at the receiving end, errors in transmission can be detected. If the number of ones in the data bit pattern is not consistent with the expected parity, it indicates that an error has occurred during transmission.

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  • 25. 

    008 - What does an optical source do?

    • Terminates fiber optics cable

    • Converts electrical energy into optical energy

    • Extends 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
    Explanation
    An optical source is responsible for converting electrical energy into optical energy. This means that it takes electrical signals and transforms them into light signals that can be transmitted through fiber optic cables. This conversion is essential for the transmission of data over long distances, as optical signals can travel much farther without losing signal integrity compared to electrical signals. Therefore, an optical source plays a crucial role in enabling the efficient and reliable transmission of information through fiber optic networks.

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  • 26. 

    008 - Laser diode power coupling is measured in which range

    • Megawatt

    • Microwatt

    • Milliwatt

    • Kilowatt

    Correct Answer
    A. Milliwatt
    Explanation
    Laser diode power coupling is measured in the milliwatt range. This is because laser diodes are compact and efficient devices that typically operate at low power levels. Milliwatt power levels are sufficient for many applications such as telecommunications, barcode scanning, laser pointers, and optical data storage. Higher power levels, such as kilowatts or megawatts, are typically used in industrial applications like laser cutting or welding, where a greater amount of energy is required. Therefore, milliwatt is the appropriate range for measuring laser diode power coupling.

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  • 27. 

    012 - A system-generated pulse is a problem for satellites and reentry vehicles that are

    • Susceptible to the wideband frequency phenomenon.

    • Directly exposed to nuclear radiations from a high-altitude burst.

    • Affected by the azimuth magnetic fields and time-varying air conductivity.

    • Influenced by the signal fading or waveform distortion caused by the structured plasma field.

    Correct Answer
    A. Directly exposed to nuclear radiations from a high-altitude burst.
  • 28. 

    (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?

    • Touch-hold push button.

    • Rotary switch.

    • Range push button.

    • Power-up self-test.

    Correct Answer
    A. Touch-hold push button.
    Explanation
    The touch-hold push button feature of the Fluke 8025A locks the measurement into the display for viewing and automatically updates the display when a new measurement is taken. This allows the user to easily view and record the measurement without it changing or being lost when a new measurement is made.

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  • 29. 

    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.
    Explanation
    Overmodulating refers to the process of increasing the amplitude of a signal beyond its normal range. This causes the signal to become distorted and produce harmonics, which are additional frequencies that are multiples of the original signal frequency. These harmonics contribute to an increase in bandwidth because they occupy additional frequency space. Therefore, the statement that overmodulating increases bandwidth due to the production of harmonics is true.

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  • 30. 

    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.
    Explanation
    Sampling is the part of the pulse code modulation (PCM) process that converts a continuous time signal into a discrete time signal. In sampling, the continuous signal is measured at regular intervals, and these samples are used to represent the original signal. This allows for the conversion of the continuous signal into a series of discrete values that can be easily processed and transmitted. Sampling is a fundamental step in PCM and is essential for accurately representing analog signals in digital form.

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  • 31. 

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

    • Checksum

    • Block check character

    • Cyclic redundancy check

    • Vertical redundancy check

    Correct Answer
    A. Checksum
    Explanation
    Checksum is an error detection method that involves adding the ASCII values of each character in a message, dividing the sum by 255, and keeping only the remainder. This remainder is then appended to the message as a checksum. When the message is received, the same process is applied, and if the calculated checksum matches the received checksum, it is assumed that the message was transmitted without errors. This method is simple and efficient for detecting errors in transmitted data.

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  • 32. 

    009 - What are two main types of photo detectors?

    • Positive intrinsic negative (PIN) and avalanche photodiode (ADP).

    • Light-emitting diode (LED) and avalanche photodiode (ADP).

    • LED and semiconductor diodes.

    • Tunnel and zener diodes.

    Correct Answer
    A. Positive intrinsic negative (PIN) and avalanche photodiode (ADP).
    Explanation
    The correct answer is Positive intrinsic negative (PIN) and avalanche photodiode (ADP). PIN photodiodes are widely used in optical communication systems and have a high sensitivity to light. They have a large depletion region, which allows for efficient collection of photons. Avalanche photodiodes, on the other hand, are used in applications that require high gain and low noise. They operate in the avalanche breakdown region, where a single photon can generate a large number of electron-hole pairs.

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  • 33. 

    009 - What photo detector converts one photon to one electron?

    • Light emitting diode (LED).

    • Avalanche photodiode.

    • Positive intrinsic negative (PIN) diode.

    • Integrated photodiode/preamplifier (IDP).

    Correct Answer
    A. Positive intrinsic negative (PIN) diode.
    Explanation
    The correct answer is Positive intrinsic negative (PIN) diode. A PIN diode is a type of photo detector that converts one photon to one electron. It consists of three layers - P, I, and N, where the intrinsic (I) layer is lightly doped. When a photon is absorbed by the intrinsic layer, it creates an electron-hole pair, and due to the electric field between the P and N layers, the electron is swept towards the N layer, generating a current. Hence, the PIN diode is capable of converting one photon to one electron.

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  • 34. 

    013 - Which one of the following statements is true concerning shielding?

    • All power lines supplying the shielded areas does not require filters.

    • Cables should be of unshielded construction.

    • Only ventilation ports are shielded along the walls.

    • Sensitive equipment will be located within the shielded barrier.

    Correct Answer
    A. Sensitive equipment will be located within the shielded barrier.
    Explanation
    Sensitive equipment will be located within the shielded barrier because shielding is used to protect sensitive equipment from electromagnetic interference (EMI) and radio frequency interference (RFI). By locating the sensitive equipment within the shielded barrier, it is effectively protected from external sources of interference.

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  • 35. 

    (018) How are voltage, time, and depth represented on the oscilloscope display?

    • Voltage = vertical axis, time = horizontal axis, and depth = intensity.

    • Voltage = intensity, time = vertical axis, and depth = horizontal axis.

    • Voltage = intensity, time = horizontal axis, and depth = vertical axis.

    • Voltage = horizontal axis, time = vertical axis, and depth = intensity.

    Correct Answer
    A. Voltage = vertical axis, time = horizontal axis, and depth = intensity.
    Explanation
    Voltage is represented on the vertical axis, time is represented on the horizontal axis, and depth is represented by the intensity on the oscilloscope display.

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  • 36. 

    (020) What area of a digital storage oscilloscope takes digitized samples and performs numerous manipulations on the data including measuring rise and fall times, periods, time intervals, and math computations?  

    • Microprocessors.

    • Acquisition.

    • Memory.

    • Input.

    Correct Answer
    A. Microprocessors.
    Explanation
    The correct answer is "Microprocessors." In a digital storage oscilloscope, the microprocessors are responsible for taking digitized samples and performing various manipulations on the data. This includes measuring rise and fall times, periods, time intervals, and math computations. The microprocessors play a crucial role in processing and analyzing the captured data in a digital storage oscilloscope.

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  • 37. 

    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
    Explanation
    The correct answer is "percent of modulation." In amplitude modulation, the amount of effect or change that the intelligence has on the carrier signal is expressed as the percentage of modulation. This indicates the extent to which the carrier signal is varied by the intelligence signal. The higher the percentage of modulation, the greater the variation in the carrier signal, resulting in a stronger representation of the intelligence signal.

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  • 38. 

    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.
    Explanation
    When using forward error control as a method of error correction, error correction takes place at the receiving end. Forward error control involves adding redundant information to the transmitted data, which allows the receiver to detect and correct errors. This method is commonly used in communication systems to ensure that the received data is accurate and reliable. By performing error correction at the receiving end, any errors that occurred during transmission can be identified and corrected, ensuring the integrity of the data.

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  • 39. 

    014 - What type of equipment often generates many spurious emissions?

    • Slow tuning receiver

    • Slow tuning transmitter

    • Rapid tuning transmitter

    • Rapid tuning receiver

    Correct Answer
    A. Rapid tuning transmitter
    Explanation
    Rapid tuning transmitters often generate many spurious emissions. This is because rapid tuning transmitters have the ability to quickly change frequencies, which can result in unintended emissions outside of their intended frequency range. These spurious emissions can cause interference with other nearby electronic devices and can be a problem in radio frequency communication systems.

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  • 40. 

    015 - What is the first step in the Air Force spectrum interference resolution (SIR) program?

    • Reporting the interference.

    • Identify the source.

    • Verifying the source.

    • Resolving the interference.

    Correct Answer
    A. Identify the source.
    Explanation
    The first step in the Air Force spectrum interference resolution (SIR) program is to identify the source of the interference. This is crucial in order to understand the nature of the problem and develop an effective resolution strategy. Without knowing the source, it would be difficult to take appropriate actions to resolve the interference and prevent future occurrences. Reporting the interference, verifying the source, and resolving the interference are important steps in the SIR program, but they can only be carried out once the source has been identified.

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  • 41. 

    010 - Which repeater amplifies optical signals without converting to and from the electrical domain?

    • Repeaters.

    • Regenerators.

    • Optical amplifiers.

    • Receiver.

    Correct Answer
    A. Optical amplifiers.
    Explanation
    Optical amplifiers are devices that boost the strength of optical signals without the need for converting them to electrical signals. Unlike regenerators and repeaters, which convert the optical signals to electrical signals before amplifying them, optical amplifiers directly amplify the optical signals in their original form. Receivers, on the other hand, are responsible for converting the optical signals back into electrical signals for further processing. Therefore, optical amplifiers are the correct answer as they amplify optical signals without converting to and from the electrical domain.

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  • 42. 

    014 - If the interference can be eliminated by disconnecting the receiving antenna, the source of the disturbance is most likely

    • Line noise.

    • Internal to the radio.

    • Radio receiver trouble.

    • External to the radio.

    Correct Answer
    A. External to the radio.
    Explanation
    If disconnecting the receiving antenna eliminates the interference, it suggests that the disturbance is coming from an external source rather than being internal to the radio or caused by radio receiver trouble. This could be due to line noise, which refers to interference caused by electrical noise on the power lines or other nearby electronic devices. Therefore, the most likely source of the disturbance is external to the radio.

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  • 43. 

    009 - Small current that flows from a photodiode even with no light is called

    • Dark current

    • Dispersion

    • Distortion

    • Ionization

    Correct Answer
    A. Dark current
    Explanation
    Dark current refers to the small current that flows through a photodiode even when there is no light present. This current is caused by the random generation of electron-hole pairs within the photodiode due to thermal energy. As a result, the dark current can affect the accuracy and sensitivity of the photodiode in low-light conditions, and it needs to be minimized for optimal performance.

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  • 44. 

    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.
    Explanation
    The responsivity of a photo detector refers to its ability to convert light into an electrical signal. The wavelength of light plays a crucial role in determining the responsivity of a photo detector. Different materials and designs of detectors have different responsivity curves, which indicate the efficiency of converting light of different wavelengths into electrical signals. Therefore, the responsivity of a photo detector is dependent on the wavelength of light it is designed to detect.

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  • 45. 

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

    • Pigtail.

    • Patch cord.

    • Jumper.

    • Breakout cables.

    Correct Answer
    A. Patch cord.
    Explanation
    A short section of a single fiber cable that has a connector at each end is called a patch cord. Patch cords are used to connect devices or equipment within a network, providing a temporary or permanent connection. They are commonly used in data centers, telecommunications systems, and computer networks to establish reliable and efficient connections between devices.

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  • 46. 

    014 - What type of electromagnetic interference (EMI) occurs when a receiver responds to off-frequency signals?

    • Brute force.

    • Co-channel.

    • Spurious responses.

    • Rusty bolt.

    Correct Answer
    A. Spurious responses.
    Explanation
    When a receiver responds to off-frequency signals, it is experiencing spurious responses. Spurious responses refer to unwanted or unintended signals that interfere with the desired signal being received. These off-frequency signals can cause distortion, interference, or false readings in the receiver.

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  • 47. 

    015 -  What program addresses persistent and recurring interferences problems in joint operations?

    • The quick fix interference reduction capability (QFIRC)

    • Air force spectrum interference resolution (AFSIR)

    • Joint spectrum interference resolution (JSIR)

    • The reliability and maintainability

    Correct Answer
    A. Joint spectrum interference resolution (JSIR)
    Explanation
    The correct answer is Joint spectrum interference resolution (JSIR). JSIR is a program that specifically deals with persistent and recurring interference problems in joint operations. It focuses on resolving spectrum interference issues that may arise during joint military exercises or operations. This program aims to ensure smooth communication and coordination between different military branches by addressing any interference problems that may occur.

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  • 48. 

    When reading forward power on a wattmeter, what does two right facing arrow head mean?

    • Equipment malfunction.

    • Calculating forward power.

    • No power is applied for reading.

    • Power exceeds 120 percent of the range.

    Correct Answer
    A. Power exceeds 120 percent of the range.
    Explanation
    The two right facing arrow heads on a wattmeter indicate that the power being measured exceeds 120 percent of the range. This means that the power being measured is higher than what the wattmeter is designed to handle. It is important to be aware of this indication as it may indicate a potential overload or malfunction in the equipment being measured.

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  • 49. 

    (033) What operational capability of the communication service monitor produces sine, square, and triangle wavforms?

    • Scope.

    • Duplex.

    • Receiver.

    • Function generator.

    Correct Answer
    A. Function generator.
    Explanation
    The operational capability of a function generator allows it to produce sine, square, and triangle waveforms. A function generator is a versatile electronic device commonly used in communication service monitors to generate different types of waveforms for testing and troubleshooting purposes. It can generate signals of various frequencies and shapes, making it an essential tool in analyzing and evaluating the performance of communication systems.

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Quiz Review Timeline (Updated): Aug 20, 2024 +

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  • Current Version
  • Aug 20, 2024
    Quiz Edited by
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  • Jan 02, 2012
    Quiz Created by
    3D153

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