2a553a CDC Volume 4
Volume 4 of the Comm/Nav CDCs
Questions and Answers
- 1.
What is the purpose of VOR?
- A.
Determine bearing to a stations
- B.
Indicate distances along the approach
- C.
Determine left/right guidance
- D.
Determine up/down guidance
Correct Answer
A. Determine bearing to a stationsExplanation
The purpose of VOR (VHF Omnidirectional Range) is to determine the bearing or direction to a station. VOR uses radio signals to provide pilots with accurate and reliable navigation information. By using VOR, pilots can determine their position in relation to the VOR station and navigate along a specific radial or course. This helps in planning and executing flights, especially during instrument approaches, where pilots need to accurately track and maintain a specific course to reach their destination.Rate this question:
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- 2.
The basic operating principle of VOR is phase comparing the
- A.
90 and 150 Hz modulated signals
- B.
30 Hz reference and 9,960 Hz FM signals
- C.
30 Hz variable and 9,960 Hz FM signals
- D.
30 Hz reference and 30 Hz variable signals
Correct Answer
D. 30 Hz reference and 30 Hz variable signalsExplanation
The VOR (VHF Omnidirectional Range) operates by phase comparing the 30 Hz reference and 30 Hz variable signals. These signals are used to determine the aircraft's bearing in relation to the VOR station. By comparing the phase difference between the two signals, the VOR system can accurately determine the direction of the aircraft from the station. This information is then displayed to the pilot on the instrument panel, allowing for navigation and course corrections.Rate this question:
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- 3.
If the magnetic bearing to a VOR station is 225 degrees, the phase difference between the 30 Hz reference and 30 Hz variable signal is
- A.
225 degrees
- B.
135 degrees
- C.
15 degrees
- D.
45 degrees
Correct Answer
D. 45 degreesExplanation
The phase difference between the 30 Hz reference and 30 Hz variable signal is determined by the magnetic bearing to the VOR station, which is 225 degrees. The phase difference is equal to the magnetic bearing, so the correct answer is 225 degrees.Rate this question:
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- 4.
VOR identification (audible) signals are transmitted
- A.
At 20 second intervals
- B.
At specified time intervals
- C.
At 30 second intervals
- D.
Continuously
Correct Answer
D. ContinuouslyExplanation
VOR identification signals are transmitted continuously. This means that the signals are constantly being broadcasted without any interruptions or breaks. The continuous transmission allows pilots and aircraft navigation systems to receive and interpret the signals accurately and in real-time. It ensures a reliable and constant source of navigation information for pilots to determine their position and navigate effectively.Rate this question:
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- 5.
The ILS localizer course width at a distance of 10 miles from the transmitter is normally
- A.
0.7 degrees
- B.
2.5 degrees
- C.
0.5 degrees
- D.
5 degrees
Correct Answer
D. 5 degrees -
- 6.
What frequency is used to transmit ILS glide slope information?
- A.
HF
- B.
VHF
- C.
LF
- D.
UHF
Correct Answer
D. UHFExplanation
UHF (Ultra High Frequency) is the correct answer for this question. ILS (Instrument Landing System) is a radio navigation system used by aircraft to guide them during the approach and landing phases of a flight. The glide slope is a component of the ILS that provides vertical guidance to the aircraft, ensuring a safe descent path. UHF frequency range, typically between 300 MHz and 3 GHz, is commonly used for ILS glide slope transmissions.Rate this question:
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- 7.
The ILS marker beacon carrier frequency is
- A.
68.1 MHz
- B.
75 kHz
- C.
75 MHz
- D.
68.1 kHz
Correct Answer
C. 75 MHzExplanation
The correct answer is 75 MHz. The Instrument Landing System (ILS) marker beacon carrier frequency is 75 MHz. Marker beacons are used to provide pilots with additional guidance during an approach and landing. They transmit specific signals that indicate the aircraft's position relative to the runway. The carrier frequency of 75 MHz is standardized for marker beacons in aviation.Rate this question:
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- 8.
What MLS outputs are provided to the pilot's and copilot's HSIs for approach and takeoff?
- A.
Ground station indications
- B.
Azimuth signals
- C.
Steering indications
- D.
Elevation signals
Correct Answer
C. Steering indicationsExplanation
The correct answer is steering indications. The MLS (Microwave Landing System) provides steering indications to both the pilot and copilot's Horizontal Situation Indicators (HSIs) during approach and takeoff. These indications help the pilots maintain the correct path and alignment with the runway. Steering indications are essential for ensuring safe and accurate navigation during critical phases of flight.Rate this question:
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- 9.
What is not an MLS output?
- A.
Azimuth deviation
- B.
Azimuth warning flag
- C.
Glide slope correction flag
- D.
Glide slope deviation
Correct Answer
C. Glide slope correction flagExplanation
The question asks for something that is not an MLS output. The options provided are azimuth deviation, azimuth warning flag, glide slope correction flag, and glide slope deviation. Azimuth deviation, azimuth warning flag, and glide slope deviation are all outputs of an MLS system, as they provide information about the deviation from the desired azimuth or glide slope. However, the glide slope correction flag is not an output of an MLS system. Therefore, it is the correct answer to the question.Rate this question:
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- 10.
On how many channels are the MLS receivers capable of operating?
- A.
559
- B.
500
- C.
669
- D.
200
Correct Answer
D. 200Explanation
The MLS receivers are capable of operating on 200 channels.Rate this question:
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- 11.
What is the frequency range of the MLS receivers?
- A.
5031-5091 MHz
- B.
200-500 MHz
- C.
500-669 MHz
- D.
669-5031 MHz
Correct Answer
A. 5031-5091 MHzExplanation
The frequency range of the MLS receivers is 5031-5091 MHz. This means that the receivers are designed to operate within this specific range of frequencies.Rate this question:
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- 12.
Which antennas are shared by MLS numbers 1 and 2?
- A.
3 and 4
- B.
3 and 2
- C.
1 and 3
- D.
1 and 2
Correct Answer
A. 3 and 4Explanation
The antennas that are shared by MLS numbers 1 and 2 are 3 and 4.Rate this question:
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- 13.
Which MLS landing system component allows for selection of system status?
- A.
Receiver power on relay
- B.
Integrated display computer unit
- C.
Flight director mode selector
- D.
Data bus coupler
Correct Answer
B. Integrated display computer unitExplanation
The integrated display computer unit is the component of the MLS landing system that allows for the selection of system status. It is responsible for displaying information and data related to the MLS system, and it provides the user with the ability to choose different system statuses based on their requirements or preferences.Rate this question:
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- 14.
When an ILS frequency is selected, the ARN-127 VOR receiver parks the HSI bearing pointer at the
- A.
10 o'clock position
- B.
6 o'clock position
- C.
3 o'clock position
- D.
4 o'clock position
Correct Answer
D. 4 o'clock positionExplanation
When an ILS frequency is selected, the ARN-127 VOR receiver parks the HSI bearing pointer at the 4 o'clock position. This positioning helps the pilot to easily distinguish between the VOR and ILS indications on the HSI. By placing the bearing pointer at the 4 o'clock position, it allows for a clear separation between the VOR radial and the localizer course, which is typically displayed at the 12 o'clock position. This positioning aids in the pilot's situational awareness and helps in accurately navigating the aircraft during ILS approaches.Rate this question:
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- 15.
Which radial will the aircraft be positioned on if the aircraft is located north of the VOR station?
- A.
090 degrees
- B.
270 degrees
- C.
000 degrees
- D.
180 degrees
Correct Answer
C. 000 degreesExplanation
If the aircraft is located north of the VOR station, it will be positioned on the 000 degrees radial. The radial is a line extending outward from the VOR station, and the 000 degrees radial is the one that points directly north. Therefore, if the aircraft is north of the VOR station, it will be positioned on the 000 degrees radial.Rate this question:
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- 16.
To get a FROM flag in view on the HSI when the magnetic bearing to the VOR station is 75 degrees, the selected course should be manually set to
- A.
75 degrees
- B.
360 degrees
- C.
150 degrees
- D.
210 degrees
Correct Answer
D. 210 degreesExplanation
To get a FROM flag in view on the HSI when the magnetic bearing to the VOR station is 75 degrees, the selected course should be manually set to 210 degrees. This is because the HSI displays the reciprocal of the magnetic bearing, which is 180 degrees opposite. By setting the selected course to 210 degrees, the HSI will display the reciprocal as 30 degrees, indicating a FROM flag.Rate this question:
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- 17.
During ILS operation, a full-scale deflection of the HSI vertical needle indicates the aircraft is off course from the runway centerline by
- A.
2.5 degrees
- B.
200 feet
- C.
400 feet
- D.
0.6 degrees
Correct Answer
A. 2.5 degreesExplanation
A full-scale deflection of the HSI vertical needle during ILS operation indicates that the aircraft is off course from the runway centerline by 2.5 degrees. This means that the aircraft is deviating significantly from the desired path and needs to make corrections to get back on track. The degree of deflection is a crucial indicator for pilots to maintain proper alignment with the runway centerline during instrument landing system operations.Rate this question:
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- 18.
In ILS operation, a deflection of two dots on the attitude director indicator glide slope deviation scale indicates the aircraft is
- A.
2.5 degrees off glide path
- B.
6.0 degrees off glide path
- C.
0.6 degrees off glide path
- D.
0.25 degrees off glide path
Correct Answer
C. 0.6 degrees off glide pathExplanation
A deflection of two dots on the attitude director indicator glide slope deviation scale indicates that the aircraft is 0.6 degrees off the glide path.Rate this question:
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- 19.
When the ILS marker beacon amber (orange) lamp illuminates, the pilot hears a
- A.
3,000 Hz tone
- B.
1,000 Hz tone
- C.
1,300 Hz tone
- D.
400 Hz tone
Correct Answer
C. 1,300 Hz toneExplanation
When the ILS marker beacon amber lamp illuminates, the pilot hears a 1,300 Hz tone. This is because the 1,300 Hz tone is associated with the middle marker beacon on the Instrument Landing System (ILS). The ILS uses marker beacons to provide guidance to pilots during instrument approaches. Each beacon is associated with a specific frequency tone, and the 1,300 Hz tone indicates the presence of the middle marker. This helps the pilot to confirm their position during the approach and make necessary adjustments.Rate this question:
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- 20.
The total number of VOR/ILS channels that can be selected by the AN/ARN-147 control box is
- A.
240
- B.
200
- C.
40
- D.
160
Correct Answer
B. 200Explanation
The AN/ARN-147 control box is capable of selecting a total of 200 VOR/ILS channels.Rate this question:
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- 21.
If the VOR station signal is lost or the receiver malfunctions, the ARN-147 system parks the bearing pointer at the
- A.
12 o'clock position
- B.
3 o'clock position
- C.
9 o'clock position
- D.
6 o'clock position
Correct Answer
B. 3 o'clock positionExplanation
The ARN-147 system is designed to provide navigation guidance using the VOR station signal. In the event of signal loss or receiver malfunction, the system parks the bearing pointer at the 3 o'clock position. This indicates that the pilot should continue on the last known course until the signal is regained or the receiver is fixed. The 3 o'clock position is chosen as it is a distinct and easily recognizable reference point on the instrument panel.Rate this question:
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- 22.
In VOR mode, what information is sent to the HSI by the ARN-147 VOR/localizer receiver?
- A.
TO/FROM, heading, and relative bearing
- B.
Left/right deviation, flag alarm, and TO/FROM
- C.
Relative bearing, flag alarm, and heading
- D.
Flag alarm, distance, and left/right deviation
Correct Answer
B. Left/right deviation, flag alarm, and TO/FROMExplanation
The ARN-147 VOR/localizer receiver sends left/right deviation, flag alarm, and TO/FROM information to the HSI in VOR mode. This means that the receiver provides the pilot with the deviation from the desired course, alerts the pilot if there is any issue or flag alarm, and indicates whether the aircraft is flying towards or away from the VOR station. This information is crucial for the pilot to navigate accurately and maintain the desired course.Rate this question:
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- 23.
What glide slope information is provided to the attitude director indicator when the AN/ARN-127 is oeprating in the ILS mode?
- A.
Navigation signals
- B.
Audio signals
- C.
Left/right deviations
- D.
Up/down deviations
Correct Answer
D. Up/down deviationsExplanation
When the AN/ARN-127 is operating in the ILS mode, it provides up/down deviations information to the attitude director indicator. This means that the AN/ARN-127 is responsible for indicating whether the aircraft is above or below the desired glide slope. It does not provide left/right deviations or audio signals, but rather focuses on vertical guidance.Rate this question:
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- 24.
The main reference burst is transmitted when the main lobe of the TACAN surface beacon radiation pattern is due
- A.
South
- B.
North
- C.
West
- D.
East
Correct Answer
D. EastExplanation
The main reference burst is transmitted when the main lobe of the TACAN surface beacon radiation pattern is due East.Rate this question:
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- 25.
A TACAN beacon provides a station identification code every
- A.
7.5 seconds
- B.
20 seconds
- C.
40 seconds
- D.
30 seconds
Correct Answer
D. 30 secondsExplanation
A TACAN beacon provides a station identification code every 30 seconds. This means that every 30 seconds, the TACAN beacon transmits a unique code that identifies the station. This code is used by aircraft or other receivers to determine their distance and bearing from the station. By transmitting the code every 30 seconds, the TACAN beacon ensures that aircraft and receivers have updated and accurate information for navigation purposes.Rate this question:
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- 26.
During TACAN operation, the two signals phased compared to produce the fine bearing (+- 1 degree) are the
- A.
1135 Hz variable and MRB
- B.
15 Hz reference and MRB
- C.
15 Hz reference and ARB
- D.
35 Hz variable and ARB
Correct Answer
D. 35 Hz variable and ARBExplanation
During TACAN operation, the fine bearing (+- 1 degree) is produced by comparing the phase of the 35 Hz variable signal and the ARB (Azimuth Reference Bit) signal. The 35 Hz variable signal represents the angular displacement between the aircraft and the ground station, while the ARB signal provides the reference for the bearing calculation. By comparing the phase of these two signals, the TACAN system can accurately determine the fine bearing of the aircraft.Rate this question:
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- 27.
When the TACAN main reference burst occurs at the minimum amplitude of the 15 Hz variable signal, the azimuth to the station is
- A.
270 degrees
- B.
180 degrees
- C.
90 degrees
- D.
0 degrees
Correct Answer
C. 90 degreesExplanation
When the TACAN main reference burst occurs at the minimum amplitude of the 15 Hz variable signal, it indicates that the station is directly to the east or west of the observer. In this case, the azimuth to the station would be 90 degrees, as it is perpendicular to the observer's line of sight.Rate this question:
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- 28.
If the HSI indicator displays a magnetic heading of 45 degrees and magnetic bearing of 5 degrees to the tactical air navigation station, the the relative bearing is
- A.
45 degrees
- B.
225 degrees
- C.
320 degrees
- D.
40 degrees
Correct Answer
C. 320 degreesExplanation
The relative bearing is the angle between the aircraft's heading and the position of the object being observed. In this case, the HSI indicator displays a magnetic heading of 45 degrees and a magnetic bearing of 5 degrees to the tactical air navigation station. To determine the relative bearing, we subtract the magnetic bearing from the magnetic heading. Therefore, 45 degrees - 5 degrees = 40 degrees. However, since the relative bearing is always measured clockwise from the aircraft's nose, we add 360 degrees to the result. Hence, the correct answer is 320 degrees.Rate this question:
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- 29.
In the tactical air navigation mode, each dot on the HSI represents an error from the selected course of
- A.
10.0 degrees
- B.
1.25 degrees
- C.
2.50 degrees
- D.
5.0 degrees
Correct Answer
D. 5.0 degreesExplanation
In tactical air navigation mode, each dot on the HSI represents an error from the selected course of 5.0 degrees. This means that if the aircraft is deviating from the selected course, the HSI will display the extent of the deviation by showing the number of dots away from the desired course. For example, if the aircraft is one dot to the right of the course, it means that it is off by 5.0 degrees to the right. This information helps pilots make necessary corrections to stay on track during their flight.Rate this question:
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- 30.
If the horizontal situation indicator bearing pointer indicates 50 degrees during tactical air navigation operation, waht selected couse should be selected to get the FROM arrow
- A.
330 degrees
- B.
0 degrees
- C.
120 degrees
- D.
270 degrees
Correct Answer
D. 270 degreesExplanation
In tactical air navigation, the horizontal situation indicator bearing pointer indicates the direction to a selected course. To get the FROM arrow, the selected course should be opposite to the bearing pointer. Since the bearing pointer indicates 50 degrees, the opposite direction would be 180 degrees away from it. Therefore, the selected course should be 180 degrees + 90 degrees (to get the FROM arrow) which equals 270 degrees.Rate this question:
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- 31.
The purpose of the TACAN system is to provide the pilot with accurate
- A.
Distance, bearing, and aural information
- B.
Aircraft heading, bearing, and distance information
- C.
Distance, aircraft heading, and aural information
- D.
Magnetic heading, aural, and distance information
Correct Answer
A. Distance, bearing, and aural informationExplanation
The TACAN system is designed to provide the pilot with accurate distance, bearing, and aural information. This means that it can determine the distance between the aircraft and a ground station, the direction or bearing to that station, and also provide aural cues or signals to assist the pilot in navigation. This information is crucial for pilots to accurately navigate and maintain situational awareness during flights.Rate this question:
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- 32.
The maximum number of tactical air navigation channels available for use by the AN/ARN-118 system is
- A.
200
- B.
390
- C.
252
- D.
126
Correct Answer
C. 252Explanation
The AN/ARN-118 system has a maximum of 252 tactical air navigation channels available for use.Rate this question:
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- 33.
The AN/ARN-118 is controlled by the area navigation system when the TACAN control box channel selector (X or Y) is set to
- A.
10
- B.
00
- C.
11
- D.
01
Correct Answer
B. 00Explanation
The correct answer is "00". The AN/ARN-118 is controlled by the area navigation system when the TACAN control box channel selector is set to "00". This indicates that the AN/ARN-118 is integrated with the area navigation system and will receive guidance and navigation information from it. The other options do not specify the correct setting for the TACAN control box channel selector, so they are not the correct answer.Rate this question:
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- 34.
What signals are produced when the AN/ARN-118 is in the transmit-receiver mode?
- A.
Only distance and BIT from a CA
- B.
Bearing, slant range distance, and BIT from a surface beacon
- C.
Only slant range distance and beacon identity tone from a surface beacon
- D.
Bearing and distance from a cooperating aircraft (CA)
Correct Answer
B. Bearing, slant range distance, and BIT from a surface beaconExplanation
When the AN/ARN-118 is in the transmit-receiver mode, it produces signals that include the bearing, slant range distance, and BIT (Built-In Test) from a surface beacon. This means that the device is able to provide information about the direction, distance, and status of a surface beacon. It does not provide signals related to a cooperating aircraft (CA) or only distance and BIT from a CA.Rate this question:
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- 35.
For two aircraft to communicate using the AN/ARN-118 in air-to-air mode when one aircraft is on channel 37Y, the other aircraft must be on channel
- A.
100Y
- B.
37X
- C.
37Y
- D.
100X
Correct Answer
A. 100YExplanation
In order for two aircraft to communicate using the AN/ARN-118 in air-to-air mode, they must be on the same channel. The first aircraft is on channel 37Y, therefore the other aircraft must also be on the same channel, which is 37Y. The answer 100Y is incorrect because it is a different channel. Similarly, 37X and 100X are also incorrect as they do not match the channel of the first aircraft.Rate this question:
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- 36.
What information is not sent to the tactical air navigation adapter from the receiver-transmitter?
- A.
Warning flag
- B.
TO/FROM
- C.
Bearing
- D.
Distance
Correct Answer
B. TO/FROMExplanation
The information that is not sent to the tactical air navigation adapter from the receiver-transmitter is the TO/FROM indication. This means that the adapter does not receive any indication of whether the aircraft is heading towards or away from the navigational beacon.Rate this question:
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- 37.
In the TACAN receiver-transmitter adapter, TO/FROM information is developed by combine magnetic bearing with
- A.
Magnetic heading
- B.
Relative bearing
- C.
Course deviation
- D.
Relative heading
Correct Answer
A. Magnetic headingExplanation
The TO/FROM information in the TACAN receiver-transmitter adapter is developed by combining the magnetic bearing with the magnetic heading. The magnetic bearing refers to the direction towards a specific point relative to magnetic north, while the magnetic heading refers to the direction in which the aircraft's nose is pointing relative to magnetic north. By combining these two pieces of information, the adapter can determine whether the aircraft is heading towards or away from the desired point.Rate this question:
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- 38.
TACAN channel data and selected mode information are routed to the receiver-transmitter as a
- A.
16-bit ternary word
- B.
32-bit ternary word
- C.
32-bit serial word
- D.
16-bit serial word
Correct Answer
A. 16-bit ternary wordExplanation
The TACAN channel data and selected mode information are routed to the receiver-transmitter as a 16-bit ternary word. This means that the information is transmitted using a 16-bit binary code, where each bit can have three possible values (0, 1, or 2). This allows for a higher level of data transmission and accuracy compared to a binary word. The use of a ternary word ensures that the receiver-transmitter can accurately interpret and process the channel data and mode information.Rate this question:
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- 39.
The purpose of the TACAN receiver-transmitter adapter is to convert
- A.
A 24-bit serial word into a 32-bit data output
- B.
Digital distance information into an analog output
- C.
Analog distance information into a digital output
- D.
A 32-bit ternary word into an analog output
Correct Answer
B. Digital distance information into an analog outputExplanation
The TACAN receiver-transmitter adapter is designed to convert digital distance information into an analog output. This means that it takes the digital distance information, which is typically represented as a series of bits, and converts it into an analog signal that can be used to provide distance information. This analog output can then be used by other systems or devices to determine the distance between the TACAN receiver and the target location.Rate this question:
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- 40.
Which acronym is used for the system that determines if an aircraft is a friend or foe?
- A.
TACAN
- B.
IFF
- C.
ADF
- D.
RADAR
Correct Answer
B. IFFExplanation
IFF stands for Identification Friend or Foe, which is a system used in military and civilian aircraft to determine whether an unknown aircraft is friendly or hostile. It allows aircraft to exchange identification codes and signals to prevent friendly fire incidents and enhance situational awareness. TACAN, ADF, and RADAR are all different systems used in aviation for navigation and surveillance purposes, but they do not specifically address the identification of friend or foe aircraft.Rate this question:
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- 41.
The ground radar and identification, friend or foe interrogator transmissions are synchronized so the radar returns can be
- A.
Used to display altitude information
- B.
Displayed on the PPI independent of the IFF reply
- C.
Displayed on the PPI with the IFF reply
- D.
Displayed on a separate plan position indicator
Correct Answer
C. Displayed on the PPI with the IFF replyExplanation
The ground radar and identification, friend or foe interrogator transmissions are synchronized so that the radar returns can be displayed on the PPI (Plan Position Indicator) together with the IFF (Identification Friend or Foe) reply. This means that the altitude information gathered from the radar returns can be displayed alongside the identification information obtained from the IFF reply, providing a comprehensive display of both altitude and identification on the same screen.Rate this question:
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- 42.
What acronym is used for the system developed to include identification, altitude, and cryptographic secure-coded reply from an aircraft?
- A.
IFF
- B.
AFSATCOM
- C.
ATCRBS
- D.
AIMS
Correct Answer
D. AIMSExplanation
AIMS stands for Aircraft Identification, Altitude, and Cryptographic Secure-Coded Reply System. This system is developed to include identification, altitude, and a secure-coded reply from an aircraft. It is used for communication and identification purposes in aviation.Rate this question:
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- 43.
The identification, friend or foe mode 4 interrogation consists of
- A.
Four 0.8-µ sec pulses, spaced 21 µ sec apart
- B.
Two 0.8 µ-sec pulses, spaced 21 µ sec apart
- C.
Four 0.5-µ sec pulses, spaced 2 µ sec apart
- D.
Two 0.5-µ sec pulses, spaced 2 µ sec apart
Correct Answer
C. Four 0.5-µ sec pulses, spaced 2 µ sec apartExplanation
The correct answer is four 0.5-µ sec pulses, spaced 2 µ sec apart. This is because the identification, friend or foe mode 4 interrogation consists of four pulses that are 0.5 microseconds in duration and spaced 2 microseconds apart. This specific pattern of pulses is used to distinguish between friendly and hostile aircraft.Rate this question:
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- 44.
For the IFF system to sense side lobe interrogations, the interrogating station transmits
- A.
A P1 pulse 6 µ sec before the first interrogation pulse
- B.
An interrogation pulse (P1) 2 µ sec after the first interrogation pulse
- C.
A P2 pulse 6 µ sec before the first interrogation pulse
- D.
A side lobe suppression pulse (P2) 2 µ sec after the first interrogation pulse
Correct Answer
D. A side lobe suppression pulse (P2) 2 µ sec after the first interrogation pulseExplanation
The correct answer is a side lobe suppression pulse (P2) 2 µ sec after the first interrogation pulse. In order for the IFF system to sense side lobe interrogations, a side lobe suppression pulse (P2) needs to be transmitted after the first interrogation pulse. This pulse helps to suppress any side lobe signals that may interfere with the accurate detection and identification of the target. By transmitting the P2 pulse after the first interrogation pulse, the system can effectively filter out any unwanted side lobe signals and improve the overall performance and reliability of the IFF system.Rate this question:
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- 45.
The IFF information pulses used for mode 1 replies are
- A.
A1, A22, A4, B1, and B2
- B.
A1, A2, A3, B1, and B4
- C.
A1, B1, B2, B4, and C1
- D.
A1, A4, B1, B4, and C1
Correct Answer
A. A1, A22, A4, B1, and B2Explanation
The correct answer is A1, A22, A4, B1, and B2. These are the IFF (Identification Friend or Foe) information pulses used for mode 1 replies. Mode 1 is a military-specific mode of operation for IFF systems. The specific pulses listed in the answer are the ones used to transmit information and identify friendly aircraft.Rate this question:
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- 46.
The maximum number of IFF reply codes that can be selected in mode 1 is
- A.
1064
- B.
73
- C.
77
- D.
32
Correct Answer
D. 32Explanation
In mode 1, there is a limit to the number of IFF reply codes that can be selected. The correct answer is 32, which means that in mode 1, only 32 different IFF reply codes can be chosen.Rate this question:
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- 47.
When the IDENT switch is activated, the IFF transponder automatically transmits an identification of position reply for
- A.
10 seconds
- B.
30 seconds
- C.
20 seconds
- D.
25 seconds
Correct Answer
C. 20 secondsExplanation
When the IDENT switch is activated, the IFF transponder automatically transmits an identification of position reply for 20 seconds. This means that for a duration of 20 seconds, the transponder will send out a signal that identifies the position of the aircraft. This can be useful in situations where the aircraft needs to be easily identified or located by air traffic control or other aircraft.Rate this question:
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- 48.
What happens when the IFF system fails to reply to a mode 4 interrogation?
- A.
The IFF CAUTION light on the pilot's instrument panel illuminates
- B.
The TEST light on the IFF control box illuminates
- C.
The TEST light on the IFF control box does not illuminate
- D.
The REPLY light on the IFF control box illuminates
Correct Answer
A. The IFF CAUTION light on the pilot's instrument panel illuminatesExplanation
When the IFF system fails to reply to a mode 4 interrogation, the IFF CAUTION light on the pilot's instrument panel illuminates.Rate this question:
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- 49.
When the IDENT-OUT-MIC switch is in the MIC position, identification, friend or foe system identification of position replies are triggered every time the
- A.
UHF radio is keyed
- B.
LHF radio is keyed
- C.
VHF radio is keyed
- D.
HF radio is keyed
Correct Answer
A. UHF radio is keyedExplanation
When the IDENT-OUT-MIC switch is in the MIC position, the identification, friend or foe system triggers position replies every time the UHF radio is keyed. This means that whenever the UHF radio is activated, the system will send out identification signals to determine the position of friendly or enemy forces.Rate this question:
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- 50.
Which position of the IFF mode 4 code selection switch is spring loaded?
- A.
EMER
- B.
ZERO
- C.
NORM
- D.
HOLD
Correct Answer
D. HOLDExplanation
The position of the IFF mode 4 code selection switch that is spring loaded is "HOLD". This means that when the switch is released, it will automatically return to the "HOLD" position. This feature ensures that the switch remains in a specific position unless intentionally moved by the operator, preventing accidental changes to the code selection.Rate this question:
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Current Version
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Mar 19, 2023Quiz Edited by
ProProfs Editorial Team -
Feb 05, 2010Quiz Created by
Egramza
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