3D156 CDC Vol. 2

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  • 1/124 Questions

    (201) The localizer equipment shelter is generally painted what colors?

    • International orange and white.
    • Olive drab and black.
    • Brown and tan.
    • Red and White.
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About This Quiz

This quiz titled '3D156 CDC Vol. 2' assesses knowledge on localizer equipment used in aviation, focusing on operational design, control methods, structural resilience, and technical specifications. It is crucial for professionals in aviation technology and navigation system maintenance.

3D156 CDC Vol. 2 - Quiz

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  • 2. 

    (201) How many assemblies support each localizer antenna?

    • 1.

    • 2.

    • 3.

    • 4.

    Correct Answer
    A. 2.
    Explanation
    The correct answer is 2 because each localizer antenna is supported by two assemblies.

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  • 3. 

    (202) The localizer station is designed for what type of operation?

    • Local control.

    • Remote control.

    • Continuous unmanned.

    • Intermittent unmanned.

    Correct Answer
    A. Continuous unmanned.
    Explanation
    The localizer station is designed for continuous unmanned operation. This means that it can function without the need for constant human presence or control. The station is likely equipped with automated systems and technologies that allow it to operate continuously without interruption. This type of design is particularly useful in scenarios where continuous monitoring or control is required, such as in industrial processes or remote surveillance.

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  • 4. 

    (202) How can the localizer station be controlled?

    • Locally only.

    • Remote only.

    • Locally from the site or remotely from control tower or RAPCON.

    • Remotely from the site or locally from the control tower or RAPCON.

    Correct Answer
    A. Locally from the site or remotely from control tower or RAPCON.
    Explanation
    The localizer station can be controlled either locally from the site or remotely from the control tower or RAPCON. This means that the station can be operated and managed by personnel who are physically present at the site, or it can be controlled from a remote location such as a control tower or radar approach control (RAPCON) facility. This flexibility allows for efficient and effective management of the localizer station, ensuring accurate and reliable navigation guidance for aircraft.

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  • 5. 

    (202) What is the maximum miles per hour (mph) wind speed the localizer equipment station is designed to withstand?

    • 50.

    • 70.

    • 90.

    • 110.

    Correct Answer
    A. 70.
    Explanation
    The localizer equipment station is designed to withstand a maximum wind speed of 70 miles per hour (mph).

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  • 6. 

    (202) How many channels do the radios in the localizer equipment station have?

    • One.

    • Two.

    • Three.

    • Four.

    Correct Answer
    A. One.
    Explanation
    The radios in the localizer equipment station have only one channel.

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  • 7. 

    (202) In megahertz (MHz), the frequency range of the transmitters in the localizer equipment station is

    • 108 to 112.

    • 324 to 336.

    • 962 to 1,213.

    • 2,250 to 2,259.

    Correct Answer
    A. 108 to 112.
    Explanation
    The correct answer is 108 to 112 MHz. This frequency range is the range of the transmitters in the localizer equipment station. The localizer equipment station is used in aviation for instrument landing systems (ILS) to provide horizontal guidance to pilots during approach and landing. The frequency range of 108 to 112 MHz is specifically allocated for the localizer equipment station and is used to transmit signals that help pilots align their aircraft with the runway centerline.

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  • 8. 

    (202) How many RF outputs are connected to the localizer antenna system for the course transmitter?

    • 1.

    • 2.

    • 3.

    • 4.

    Correct Answer
    A. 2.
    Explanation
    The localizer antenna system for the course transmitter is connected to two RF outputs.

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  • 9. 

    (202) What are the modulation frequencies in the localizer course transmitter?

    • 90,150, and 2250 Hz.

    • 150 and 2259 Hz.

    • 90, and 2259 Hz.

    • 90, 150, and 1020 Hz.

    Correct Answer
    A. 90, 150, and 1020 Hz.
    Explanation
    The modulation frequencies in the localizer course transmitter are 90, 150, and 1020 Hz.

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  • 10. 

    (202) What is the nominal carrier plus sideband (CSB) watt (W) output power of the course transmitter in the localizer?

    • 10.

    • 15.

    • 20.

    • 25.

    Correct Answer
    A. 15.
    Explanation
    The nominal carrier plus sideband (CSB) watt output power of the course transmitter in the localizer is 15.

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  • 11. 

    (202) What is the nominal carrier plus sideband (CSB) watt (W) output power of the clearance transmitter in the localizer?

    • 10.

    • 15.

    • 20.

    • 25.

    Correct Answer
    A. 10.
    Explanation
    The nominal carrier plus sideband (CSB) watt output power of the clearance transmitter in the localizer is 10.

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  • 12. 

    (203) What is the first basic operation of the localizer station?

    • Monitor the radiated pattern.

    • Radiating the pattern.

    • Control transmitter.

    • Update status.

    Correct Answer
    A. Radiating the pattern.
    Explanation
    The first basic operation of the localizer station is radiating the pattern. This means that the localizer station is responsible for transmitting the radio signals that form the pattern used by aircraft to determine their position relative to the runway centerline during approach and landing. By radiating the pattern, the localizer station ensures that the necessary signals are available for aircraft to accurately navigate and align themselves with the runway.

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  • 13. 

    (203) In the localizer, what frequency, in kilohertz (kHz), is the course (CRS) carrier transmitter?

    • Station assigned frequency (SAF) + 4.00.

    • SAF +4.75.

    • SAF -4.75.

    • SAF -4.00.

    Correct Answer
    A. SAF +4.75.
    Explanation
    The correct answer is SAF +4.75. This means that the frequency of the course (CRS) carrier transmitter is the station assigned frequency (SAF) plus 4.75 kHz.

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  • 14. 

    (203) What is the capture effect principle in reference to the localizer?

    • Stronger radiated signal controls the aircraft receiver.

    • Weaker radiated signal controls the aircraft receiver.

    • Aircraft transmitter controls the localizer.

    • Aircraft receiver controls the localizer.

    Correct Answer
    A. Stronger radiated signal controls the aircraft receiver.
    Explanation
    The capture effect principle in reference to the localizer is when the stronger radiated signal controls the aircraft receiver. This means that if there are multiple signals being received by the aircraft, the receiver will lock onto the stronger signal and follow its guidance. This is important for maintaining accurate navigation and ensuring that the aircraft stays on the correct course.

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  • 15. 

    (203) In the localizer, what frequency, in kilohertz (kHz), is the clearance (CLR) carrier transmitter?

    • Station assigned frequency (SAF) + 4.75.

    • SAF +4.00.

    • SAF -4.75.

    • SAF -4.00.

    Correct Answer
    A. SAF -4.75.
    Explanation
    The correct answer is SAF -4.75. This is because the clearance (CLR) carrier transmitter frequency in the localizer is obtained by subtracting 4.75 kilohertz (kHz) from the station assigned frequency (SAF).

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  • 16. 

    (203) The hertz (Hz) frequency of the coded tone to provide the station identification (ID) is

    • 770.

    • 1,020.

    • 1,410.

    • 2,250.

    Correct Answer
    A. 1,020.
    Explanation
    The correct answer is 1,020. The question is asking for the hertz (Hz) frequency of the coded tone used for station identification (ID). Out of the given options, 1,020 is the only frequency that matches the criteria.

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  • 17. 

    (203) How many log-periodic dipole antennas (LPD) are there in the localizer antenna array?

    • 7.

    • 10.

    • 14.

    • 16.

    Correct Answer
    A. 14.
    Explanation
    There are 14 log-periodic dipole antennas (LPD) in the localizer antenna array.

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  • 18. 

    (203) How many monitors must detect a fault to cause an equipment transfer in the localizer?

    • One.

    • Two.

    • Three.

    • Four.

    Correct Answer
    A. Two.
    Explanation
    Two monitors must detect a fault to cause an equipment transfer in the localizer. This means that there are multiple monitors in place to ensure the accuracy and reliability of the equipment. If only one monitor detects a fault, it may be considered as a false alarm or a temporary issue. However, if two monitors detect a fault simultaneously, it is more likely to be a genuine problem, and an equipment transfer is initiated to maintain the functionality and safety of the localizer.

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  • 19. 

    (203) Which parameter is not checked by the localizer course monitors?

    • Course.

    • Frequency difference.

    • Radio frequency (RF) level.

    • Identification (ID) precent modification.

    Correct Answer
    A. Frequency difference.
    Explanation
    The localizer course monitors are responsible for checking various parameters to ensure the accuracy and integrity of the localizer signal. These parameters include the course, radio frequency (RF) level, and identification (ID) percent modification. However, the parameter that is not checked by the localizer course monitors is the frequency difference. The frequency difference refers to the variance between the localizer frequency and the assigned frequency, and it is not within the scope of the localizer course monitors' responsibilities.

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  • 20. 

    (203) Which unit is not tied into the control unit in the localizer?

    • Distribution unit.

    • Changeover unit.

    • Power supply unit.

    • Battery backup unit.

    Correct Answer
    A. Distribution unit.
    Explanation
    The distribution unit is not tied into the control unit in the localizer. The control unit is responsible for managing and controlling the localizer system, while the distribution unit is responsible for distributing power and signals to various components of the system. Therefore, the distribution unit is not directly connected to the control unit.

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  • 21. 

    (203) What is a function of the dual power supply in the localizer?

    • Regulate line frequency.

    • Display various voltages.

    • Keep backup batteries charged.

    • Regulate alternating current (AC) power.

    Correct Answer
    A. Keep backup batteries charged.
    Explanation
    The dual power supply in the localizer is responsible for keeping the backup batteries charged. This ensures that there is a reliable power source in case of a power outage or failure. By keeping the backup batteries charged, the dual power supply ensures continuous operation of the localizer system even when the main power source is not available.

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  • 22. 

    (203) In watts (W) and milliwatts (mW) respectively, what is the nominal localizer course transmitter carrier-plus sideband (CSB) and sideband only (SBO) power?

    • 15, 360.

    • 10, 300.

    • 5, 190.

    • 3, 190.

    Correct Answer
    A. 15, 360.
    Explanation
    The nominal localizer course transmitter carrier-plus sideband (CSB) power is 15 watts (W) and the sideband only (SBO) power is 360 milliwatts (mW).

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  • 23. 

    (203) What is the output frequency of the synthesized frequency source (SFS) in the localizer course transmitter?

    • Station assigned frequency (SAF).

    • 55 kilohertz (kHz).

    • SAF +4.75 kHz.

    • SAF -4.75 kHz.

    Correct Answer
    A. SAF +4.75 kHz.
    Explanation
    The output frequency of the synthesized frequency source (SFS) in the localizer course transmitter is the station assigned frequency (SAF) plus 4.75 kHz.

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  • 24. 

    (203) Which unit of the localizer course transmitter provides a means of suppressing the carrier in the sideband only (SBO)?

    • Exciter.

    • Modulator assembly.

    • Identification keyer.

    • Diode-switching network.

    Correct Answer
    A. Diode-switching network.
    Explanation
    The diode-switching network is the unit of the localizer course transmitter that provides a means of suppressing the carrier in the sideband only (SBO). This network uses diodes to switch the carrier on and off, allowing only the sideband signal to be transmitted. This helps to improve the accuracy and clarity of the localizer course signal by eliminating unwanted carrier signals. The exciter generates the carrier signal, the modulator assembly modulates the carrier with the navigation information, and the identification keyer adds identification signals to the transmission.

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  • 25. 

    (203) What is the nominal clearance sideband only (SBO) milliwatt (mW) power in the localizer?

    • 180.

    • 300.

    • 360.

    • 450.

    Correct Answer
    A. 300.
    Explanation
    The nominal clearance sideband only (SBO) milliwatt (mW) power in the localizer is 300.

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  • 26. 

    (203) How does the kilohertz (kHz) output frequency of the localizer clearance transmitter compare to the assigned localizer station frequency?

    • 4.0 above.

    • 4.0 below.

    • 4.75 above.

    • 4.75 below.

    Correct Answer
    A. 4.75 below.
    Explanation
    The kilohertz (kHz) output frequency of the localizer clearance transmitter is 4.75 below the assigned localizer station frequency.

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  • 27. 

    (203) From where does the 90/150 hertz (Hz) control assembly in the clearance transmitter receiver its 90- and 150-Hz signals?

    • Changeover unit.

    • Local control unit.

    • Course transmitter.

    • Clearance monitor.

    Correct Answer
    A. Course transmitter.
    Explanation
    The 90/150 Hz control assembly in the clearance transmitter receiver its 90- and 150-Hz signals from the course transmitter.

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  • 28. 

    (203) A basic function of the localizer radio frequency (RF) changeover unit is

    • Identifation (ID) generation.

    • RF generation.

    • IF measurement.

    • RF measurement.

    Correct Answer
    A. RF measurement.
    Explanation
    The localizer radio frequency (RF) changeover unit is responsible for measuring the RF signal. This means that it is used to determine the characteristics and properties of the RF signal, such as its frequency, power, or modulation. It is not involved in identification (ID) generation, RF generation, or IF measurement.

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  • 29. 

    (203) In the localizer, when one carrier signal is routed to the antenna, the other carrier signal is routed to the 

    • Control unit.

    • Dummy loads.

    • Changerover unit.

    • Distribution unit.

    Correct Answer
    A. Dummy loads.
    Explanation
    In the localizer, when one carrier signal is routed to the antenna, the other carrier signal is routed to the dummy loads. Dummy loads are used to absorb the excess power from the signal that is not being transmitted, preventing it from interfering with the transmitted signal. This helps to maintain signal integrity and minimize any interference or distortion.

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  • 30. 

    (203) The left antennas at the localizer are fed a sideband only (SBO) signal that is at what degrees out of phase compared to the SBO signal fed to the right antennas?

    • 0.

    • 90.

    • 180.

    • 270.

    Correct Answer
    A. 180.
    Explanation
    The left antennas at the localizer are fed a sideband only (SBO) signal that is 180 degrees out of phase compared to the SBO signal fed to the right antennas.

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  • 31. 

    (203) Localizer clearance carrier-plus sideband (CSB) and sideband only (SBO) signals are fed to which antennas?

    • Pairs 1-5.

    • Pairs 3-6.

    • Inner four pairs.

    • All antennas.

    Correct Answer
    A. Pairs 1-5.
    Explanation
    The localizer clearance carrier-plus sideband (CSB) and sideband only (SBO) signals are fed to pairs 1-5 antennas.

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  • 32. 

    (203) The localizer clearance (CLR) signals are applied simultaneously to which antennas?

    • Entire array.

    • Middle.

    • Outer.

    • Inner.

    Correct Answer
    A. Inner.
    Explanation
    The localizer clearance (CLR) signals are applied simultaneously to the inner antennas.

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  • 33. 

    (203) What provides samples of the localizer radiated signals to the radio frequency (RF) combining network?

    • Sampling loops in each log periodic dipole (LPD).

    • Clearance frequency distribution unit.

    • Course frequency distribution unit.

    • Integral detectors.

    Correct Answer
    A. Sampling loops in each log periodic dipole (LPD).
    Explanation
    Sampling loops in each log periodic dipole (LPD) provide samples of the localizer radiated signals to the radio frequency (RF) combining network. These sampling loops are a crucial component of the system as they capture and measure the signals emitted by the localizer. By sampling the signals, the system can accurately determine the direction and position of an aircraft in relation to the localizer. The samples collected by the sampling loops are then fed into the RF combining network, where they are combined and processed to provide the necessary information for navigation and guidance.

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  • 34. 

    (203) In a single-frequency localizer using 8 antennas, what is the sideband only (SBO) and carrier-plus sideband (CSB) phase relationship between the two antennas of each pair?

    • SBO in phase; CSB in phase.

    • SBO in phase; CSB 180° out of phase.

    • SBO 180° out of phase; CSB in phase.

    • SBO 180° out of phase; CSB 180° out of phase.

    Correct Answer
    A. SBO 180° out of phase; CSB in phase.
    Explanation
    In a single-frequency localizer using 8 antennas, the sideband only (SBO) phase relationship between the two antennas of each pair is 180° out of phase, while the carrier-plus sideband (CSB) phase relationship is in phase. This means that the sidebands of each pair of antennas are 180° out of phase, while the carrier and sidebands are in phase.

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  • 35. 

    (203) In a single-frequency localizer, using 8 or 14 antennas, the course width is maintained at 5.0° by

    • Increasing the transmitter sideband only (SBO) power output to the antennas.

    • Increasing the transmitter carrier-plus sideband (CSB) power output to the antennas.

    • De-phasing the SBO and increasing the CSB modulation percentage.

    • Tailoring the antenna power levels, a-spacing, and pair-to-pair phasing.

    Correct Answer
    A. Tailoring the antenna power levels, a-spacing, and pair-to-pair phasing.
    Explanation
    In a single-frequency localizer, the course width is maintained at 5.0° by tailoring the antenna power levels, a-spacing, and pair-to-pair phasing. This means that the power levels of the antennas are adjusted, the distance between the antennas (a-spacing) is optimized, and the phasing between pairs of antennas is adjusted. These adjustments ensure that the signals from the antennas combine in a way that creates a narrow course width of 5.0°, allowing for precise navigation along the desired course.

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  • 36. 

    (203) What is the minimum difference in depth of modulation (DDM) value that will be indicated outside the course width points in a single-frequency localizer using 14 antennas?

    • 0.155.

    • 0.175.

    • 0.200.

    • 0.240.

    Correct Answer
    A. 0.200.
    Explanation
    In a single-frequency localizer using 14 antennas, the minimum difference in depth of modulation (DDM) value that will be indicated outside the course width points is 0.200. This means that any DDM value below 0.200 will not be indicated outside the course width points.

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  • 37. 

    (203) If an antenna cable is broken or shorted, it will cause

    • An abnormal indication.

    • A transmitter changeover.

    • A cable fault alarm.

    • A station shutdown.

    Correct Answer
    A. A station shutdown.
    Explanation
    If an antenna cable is broken or shorted, it will cause a station shutdown. This is because the antenna cable is responsible for transmitting and receiving signals between the antenna and the station equipment. If the cable is broken or shorted, it will disrupt the communication and prevent the station from functioning properly, leading to a shutdown.

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  • 38. 

    (203) Which parameter is not checked by the localizer course monitors?

    • Frequency separation.

    • Radio frequency (RF) level.

    • Identification (ID) percent modulation.

    • Width difference in depth of modulation (DDM).

    Correct Answer
    A. Frequency separation.
    Explanation
    The localizer course monitors are responsible for checking various parameters to ensure the accuracy and integrity of the localizer signal. These parameters include radio frequency (RF) level, identification (ID) percent modulation, and width difference in depth of modulation (DDM). However, frequency separation is not one of the parameters that the localizer course monitors check.

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  • 39. 

    (203) What is the kilohertz (kHz) frequency of the clock pulse generated by the timing assembly in a localizer course monitor?

    • 460.8.

    • 500.8.

    • 512.4.

    • 602.5.

    Correct Answer
    A. 460.8.
    Explanation
    The correct answer is 460.8. The question asks for the kilohertz (kHz) frequency of the clock pulse generated by the timing assembly in a localizer course monitor. Out of the given options, 460.8 is the only one that represents a kilohertz frequency. Therefore, it is the correct answer.

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  • 40. 

    (203) Which monitor assembly displays the measured parameters?

    • Signal processor.

    • Digital readout.

    • Measurement.

    • Timing.

    Correct Answer
    A. Digital readout.
    Explanation
    The digital readout is the monitor assembly that displays the measured parameters. This means that it is responsible for showing the values of the parameters being measured. The other options, signal processor, measurement, and timing, do not specifically refer to the display of the measured parameters.

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  • 41. 

    (203) Which circuit card assembly in the localizer course (CRS) monitors process the voltage level that results from the predominant frequency difference in depth modulation (DDM) measurement?

    • Alarm.

    • Timing.

    • Measurement.

    • Digital readout.

    Correct Answer
    A. Alarm.
    Explanation
    The circuit card assembly in the localizer course (CRS) that monitors and processes the voltage level resulting from the predominant frequency difference in depth modulation (DDM) measurement is the Alarm circuit card assembly. This card assembly is responsible for detecting any anomalies or deviations in the voltage level and triggering an alarm if necessary. It plays a crucial role in ensuring the accuracy and reliability of the DDM measurement process.

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  • 42. 

    (203) What is the major difference in the localizer clearance (CLR) monitor and cource (CRS) monitor?

    • Measurement of the clearance (CLR) frequency.

    • Frequency of the radio frequency (RF) signals.

    • Digital readout assembly.

    • Timing pulse generated.

    Correct Answer
    A. Measurement of the clearance (CLR) frequency.
    Explanation
    The major difference between the localizer clearance (CLR) monitor and course (CRS) monitor is the measurement they provide. The CLR monitor measures the frequency of the clearance (CLR) signal, while the CRS monitor measures the frequency of the course (CRS) signal.

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  • 43. 

    (203) An 18.5 percent modulation difference converted to difference in depth of modulation (DDM) is

    • .018.

    • .185.

    • 1.85.

    • 185.

    Correct Answer
    A. .185.
    Explanation
    The question asks for the difference in depth of modulation (DDM) when the modulation difference is 18.5 percent. To convert the modulation difference to DDM, we divide the percentage by 100. Therefore, 18.5 percent is equal to 0.185.

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  • 44. 

    (203) Which localizer signal characteristic does not affect the difference in depth of modulation (DDM)?

    • Modulation.

    • Sideband and carrier phasing.

    • Station assigned frequency (SAF).

    • Amplitude of the sidebands and carrier.

    Correct Answer
    A. Station assigned frequency (SAF).
    Explanation
    The station assigned frequency (SAF) does not affect the difference in depth of modulation (DDM) for a localizer signal. DDM is determined by the amplitude of the sidebands and carrier, as well as the modulation and sideband and carrier phasing. SAF refers to the frequency assigned to the localizer station and is not directly related to the modulation characteristics of the signal. Therefore, it does not impact the DDM.

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  • 45. 

    (203) If during a ground check you are taking a measurement from the 35° survey checkpoint, where on the airfield are you located?

    • Runway centerline.

    • Runway threshold.

    • Near field arc.

    • Far field arc.

    Correct Answer
    A. Near field arc.
    Explanation
    If you are taking a measurement from the 35° survey checkpoint during a ground check, you are located on the near field arc of the airfield. The near field arc is a specific location on the airfield that is used as a reference point for measurements and surveys. It is typically located near the runway centerline and is used to ensure accurate positioning and alignment of various elements on the airfield.

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  • 46. 

    (203) Why are the localizer course and clearance transmitter's output frequencies separated by 9.5 kilohertz (kHz)?

    • Accomodate the bandwidth of the combined signals.

    • Prevent incidental signal jamming.

    • Match aircraft receiver design.

    • Prevent signal combining.

    Correct Answer
    A. Prevent signal combining.
    Explanation
    The localizer course and clearance transmitter's output frequencies are separated by 9.5 kilohertz (kHz) to prevent signal combining. If the frequencies were not separated, they could interfere with each other and cause signal jamming or distortion. By keeping the frequencies separate, the signals can be transmitted and received without interference, ensuring clear communication and navigation for aircraft.

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  • 47. 

    (203) What role do the localizer's sideband only (SBO) signals play in capturing the aircraft receiver?

    • They combine with the carrier plus sideband (CSB) and the stronger composite signal captures the receiver.

    • Secondary capture when within 1000 feet of touchdown.

    • The stronger of the captures the receiver.

    • Very little.

    Correct Answer
    A. Very little.
    Explanation
    The localizer's sideband only (SBO) signals play a very minimal role in capturing the aircraft receiver. The stronger composite signal, which consists of the carrier plus sideband (CSB) signals, is primarily responsible for capturing the receiver. The SBO signals do not have a significant impact on this process.

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  • 48. 

    (204) What is the primary function of the control unit in the glide slope station?

    • Generates radio frequency (RF) signals.

    • Provides operating voltages.

    • Automatic control.

    • Monitoring.

    Correct Answer
    A. Automatic control.
    Explanation
    The control unit in the glide slope station is responsible for automatic control. This means that it is in charge of regulating and adjusting the glide slope signals to ensure that the aircraft maintains the correct descent path during approach and landing. It automatically adjusts the glide slope signals based on the aircraft's position and altitude, allowing for a safe and accurate landing.

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  • 49. 

    (203) Which localizer output would result in a change in the capture points from facility reference?

    • 12 watt (W) Course (CRS) Carrier plus sideband (CSB).

    • 200 milliwatt (mW) CRS sideband only (SBO).

    • 10 W clearance (CLR) CSB.

    • 15 W CRS CSB.

    Correct Answer
    A. 12 watt (W) Course (CRS) Carrier plus sideband (CSB).
    Explanation
    The localizer output that would result in a change in the capture points from facility reference is the 12 watt (W) Course (CRS) Carrier plus sideband (CSB). This output provides a stronger signal with both the carrier and sideband, which would allow for a more accurate capture of the localizer signal. The other options either have a lower power output or do not include both the carrier and sideband, which would not provide the same level of accuracy for capturing the localizer signal.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 16, 2014
    Quiz Created by
    Rale123

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