2A251 Volume 5 UREs

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| By Catherine Halcomb

Catherine Halcomb

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What are the two processes in which Joint Tactical Information Distribution System (JTIDS) fine sychronization are accomplished?
- Passive and active
- Active and dynamic
- Passive and radio silent
- Radio silent and reflexive

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2.

Which radar application is used to produce a pictorial map of the terrain?
- Ground mapping
- Terrain following
- Terrain avoidance
- Synthetic aperture radar
Correct Answer

A. Ground mapping

Explanation

Ground mapping is the radar application used to produce a pictorial map of the terrain. This technique involves the use of radar signals to create a detailed image of the Earth's surface, including features such as mountains, valleys, and bodies of water. By transmitting radar pulses and measuring the time it takes for the signals to bounce back, ground mapping radar can accurately determine the topography of the terrain and generate a visual representation of it. This information is useful in various applications, such as cartography, navigation, and military operations.

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3.

Which radar application sends data to compute time-to-go parameters?
- Search radar
- Weather radar
- Bombing radar
- Synthetic aperture radar
Correct Answer

A. Bombing radar

Explanation

Bombing radar is used in military aircraft to accurately determine the time-to-go parameters for releasing bombs. This radar system sends data to the aircraft's computer, which calculates the remaining time and distance required for the bomb to reach its target. This information is crucial for ensuring accurate targeting and successful bombing missions.

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4.

The elapsed time indicator of the receiver/transmitter (R/T) indicates time power has been
- Applied to the R/T
- Removed from the R/T
- Applied to digital data processor
- Removed from digital data processor
Correct Answer

A. Applied to the R/T

Explanation

The elapsed time indicator of the receiver/transmitter (R/T) indicates the amount of time that power has been applied to the R/T. This means that the indicator shows how long the R/T has been powered on and operating.

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5.

What is the primary unit of any computer information system?
- Storage
- Memory
- Arithmetic logic unit
- Central processing unit
Correct Answer

A. Central processing unit

Explanation

The primary unit of any computer information system is the central processing unit (CPU). The CPU is responsible for executing instructions and performing calculations in a computer. It controls and coordinates the activities of all the other hardware components, such as memory, storage, and input/output devices. Without a CPU, a computer would not be able to process data and perform tasks. Therefore, the CPU is considered the primary unit of a computer information system.

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6.

Before power is connected to the radio frequency transmission line test set (RFTLTS) you must ensure the ON/POWER/OFF switch is in the OFF position and a suitable grounding strap is connected between the grounding lug on the right side of RFTLTS unit 1 and the
- Aircraft
- Power unit
- Parking ramp
- Time domain reflectometer
Correct Answer

A. Aircraft

Explanation

Before connecting power to the radio frequency transmission line test set (RFTLTS), it is important to ensure that the ON/POWER/OFF switch is in the OFF position. Additionally, a suitable grounding strap should be connected between the grounding lug on the right side of the RFTLTS unit 1 and the aircraft. This grounding strap helps to prevent any potential electrical hazards and ensures that the RFTLTS is properly grounded to the aircraft.

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7.

Before using a dropped torque wrench, you must
- Have it recalibrated
- Update the certification label
- Cycle through the breakaway torque
- Set the wrench to its maximum setting
Correct Answer

A. Have it recalibrated

Explanation

To ensure the accuracy and reliability of a dropped torque wrench, it is necessary to have it recalibrated. Dropping the wrench can cause internal components to shift or become misaligned, affecting its torque measurement. By recalibrating the wrench, it can be adjusted and calibrated back to its original specifications, ensuring accurate torque readings. This is crucial for maintaining the integrity of torque-sensitive applications and preventing potential errors or failures.

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8.

Sealants keep out water, fumes and the atmosphere to protect the airframe against
- Wear and tear
- Corrosion
- Chaffing
- Leakage
Correct Answer

A. Corrosion

Explanation

Sealants are used to create a barrier that prevents water, fumes, and the atmosphere from reaching the airframe. This is important because corrosion can occur when these elements come into contact with the airframe. Corrosion is the gradual deterioration of metal due to a chemical reaction with its environment, and it can weaken the structure of the airframe over time. By keeping out these harmful elements, sealants help to protect the airframe from corrosion and extend its lifespan.

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9.

To prevent interference and possible terminal shutdowns, what systems does the Tactical Information Gateway (TIG) system monitor?
- IFF, ETCAS, and TACAN
- ETCAS and radar altimeter
- IFF, color weather radar, and MLS
- TACAN, VOR/ILS, and radar altimeter
Correct Answer

A. IFF, ETCAS, and TACAN

Explanation

The Tactical Information Gateway (TIG) system monitors the IFF (Identification Friend or Foe) system, ETCAS (Enhanced Traffic Collision Avoidance System), and TACAN (Tactical Air Navigation) system. These systems are monitored to prevent interference and possible shutdowns of the terminal.

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10.

In a frequency-shift radar system, the Doppler principle makes it possible to instantaneously sense and measure
- Altitude and ground track
- Target elevation and speed
- Groundspeed and drift angle
- Magnetic heading and altitude
Correct Answer

A. Groundspeed and drift angle

Explanation

The Doppler principle in a frequency-shift radar system allows for the instantaneous sensing and measurement of groundspeed and drift angle. This means that the radar system can accurately determine the speed at which a target is moving relative to the ground, as well as the angle at which it is drifting. This information is crucial for various applications such as aviation, maritime navigation, and meteorology.

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11.

The resolution of a computer monitor is expressed in the number of pixels that make up the image. The sharper the image, the
- Lower the dot color
- Higher the dot pitch
- Higher the resolution
- Higher the refresh rate
Correct Answer

A. Higher the resolution

Explanation

The resolution of a computer monitor refers to the number of pixels that are used to create the image. A higher resolution means that there are more pixels, resulting in a sharper and more detailed image. Therefore, the statement "higher the resolution" is the correct answer as it accurately explains the relationship between resolution and image sharpness.

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12.

What power meter control compensates for a slight sensitivity associated with a particular type of power sensor
- CAL ADJ
- CAL FACTOR %
- SENSOR ZERO
- RANGE HOLD
Correct Answer

A. CAL ADJ

Explanation

CAL ADJ stands for Calibration Adjustment, which is a power meter control that compensates for a slight sensitivity associated with a particular type of power sensor. This control allows the user to make adjustments to the calibration settings of the power meter to account for any inaccuracies or deviations in the sensor's sensitivity. By using CAL ADJ, the user can ensure accurate power measurements by fine-tuning the calibration of the power meter to match the specific characteristics of the sensor being used.

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13.

Which radar system is based on the Doppler principle?
- Beacon
- Frequency-shift
- Pulse-modulation
- Frequency-modulation
Correct Answer

A. Frequency-shift

Explanation

The radar system based on the Doppler principle is the Frequency-shift radar. The Doppler principle states that there is a change in frequency when there is relative motion between the source of the wave and the observer. In the case of Frequency-shift radar, it measures the change in frequency of the transmitted signal that occurs when it reflects off a moving target. By analyzing this frequency shift, the radar system can determine the velocity of the target.

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14.

Which component in a pulse-modulation radar set supplies the voltages that operate the other radar components?
- Antenna
- Indicator
- Transmitter
- Power Supply
Correct Answer

A. Power Supply

Explanation

The power supply in a pulse-modulation radar set supplies the voltages that operate the other radar components. It provides the necessary electrical power to the antenna, indicator, and transmitter, allowing them to function properly. Without a power supply, the radar set would not be able to generate and transmit pulses, receive and process signals, or display the radar information. Therefore, the power supply plays a crucial role in supplying the required voltages for the operation of the other radar components.

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15.

In a frequency-shift radar system, what is the relationship between a transmitter/receiver(T/R) and an aircraft when the received frequency is lower that the transmitted frequency?
- They are a constant distance away from each other
- The aircraft is not reflecting any of the radar pulses
- The aircraft is flying toward the T/R
- The aircraft is flying away from the T/R
Correct Answer

A. The aircraft is flying away from the T/R

Explanation

When the received frequency is lower than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is moving away from the transmitter/receiver (T/R). This is because the frequency shift is caused by the Doppler effect, which occurs when there is relative motion between the T/R and the aircraft. As the aircraft moves away, the frequency of the radar signals received by the T/R decreases, resulting in a lower received frequency compared to the transmitted frequency.

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16.

What is/are the function(s) of the SET knob located on the combined altitude radar altimeter indicator?
- Used as an on/off control
- Used as an on/off control and to set the VALI indicator
- Used as an on/off control and as a test button to check the system
- Used as an on/off control, to set the VALI indicator, and as a test button to check the system
Correct Answer

A. Used as an on/off control, to set the VALI indicator, and as a test button to check the system

Explanation

The SET knob on the combined altitude radar altimeter indicator serves multiple functions. Firstly, it is used as an on/off control, allowing the user to turn the system on or off. Additionally, the SET knob is used to set the VALI (Vertical Altitude Line Indicator) indicator, which helps the pilot maintain a specific altitude. Lastly, the SET knob can also act as a test button, allowing the user to check the system's functionality.

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17.

Which radar application is used to fly along a preselected altitude above the ground?
- Search radar
- Ground mapping
- Terrain following
- Terrain avoidance
Correct Answer

A. Terrain following

Explanation

Terrain following is the radar application used to fly along a preselected altitude above the ground. This application utilizes radar technology to detect and track the terrain below the aircraft, allowing it to maintain a consistent altitude above the ground even in varying terrain conditions. By continuously monitoring the ground below, terrain following radar helps the aircraft avoid obstacles and maintain a safe and controlled flight path.

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18.

How many hops per second does a Tactical Digital Information Link (TADIL) J perform to preclude jamming by a narrow band jammer?
- 51,000 per second
- 77,000 per second
- 51,000 per minute
- 77,000 per minute
Correct Answer

A. 77,000 per second

Explanation

The correct answer is 77,000 per second. This high number of hops per second is necessary to prevent jamming by a narrow band jammer. By rapidly changing frequencies, the TADIL J system can avoid being targeted and disrupted by the jamming signals. This frequency hopping technique makes it difficult for the jammer to track and interfere with the communication link, ensuring the integrity and security of the information being transmitted.

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19.

Which component of the Tactical Information Gateway (TIG) system enables beyond line-of-sight (BLOS) coverage
- L-Band Antennas
- Multipurpose interface panel
- Low noise amplifier/diplexer assembly
- Satellite communication/global positioning system antenna
Correct Answer

A. Satellite communication/global positioning system antenna

Explanation

The satellite communication/global positioning system antenna enables beyond line-of-sight (BLOS) coverage in the Tactical Information Gateway (TIG) system. This antenna is responsible for receiving and transmitting signals to and from satellites, allowing communication and positioning information to be transmitted over long distances, even when there are obstacles in the line of sight. By using satellite communication, the TIG system can achieve BLOS coverage, ensuring reliable and continuous communication capabilities in various operational scenarios.

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20.

The primary computer memory that usually cannot be erased is called
- Random access memory (RAM)
- Read only memory (ROM)
- Secondary
- Auxiliary
Correct Answer

A. Read only memory (ROM)

Explanation

ROM stands for Read Only Memory and it is a type of primary computer memory that cannot be erased. Unlike RAM, which is volatile and loses its data when power is turned off, ROM retains its data even when the computer is powered off. ROM is used to store permanent data and instructions that are essential for the computer's operation, such as the BIOS (Basic Input/Output System). It is called "read only" because the data stored in ROM can only be read and not modified or erased by normal computer operations.

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21.

In a pulse-modulation radar system, the transmitter does not interfere with the receiver. This is possible because the transmitter
- Is turned off after each pulse.
- Shifts the frequency of the pulse
- Transmits on a different frequency
- Uses a different antenna than the receiver
Correct Answer

A. Is turned off after each pulse.

Explanation

In a pulse-modulation radar system, the transmitter being turned off after each pulse ensures that it does not interfere with the receiver. By turning off the transmitter, it allows the receiver to detect the returning echoes without any interference from the transmitted signal. This ensures that the radar system can accurately measure the time delay between the transmitted pulse and the received echo, allowing for accurate distance calculations.

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22.

When transmitting in the high power mode, what is the power output of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS)
- 1050 watts
- 520 watts
- 260 watts
- 130 watts
Correct Answer

A. 1050 watts

Explanation

The power output of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS) when transmitting in the high power mode is 1050 watts.

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23.

What is the range of signals that the low pass filters pass?
- 240-304 megahertz (MHz)
- 480-608 MHz
- 960-1215 MHz
- 1920-2430 MHz
Correct Answer

A. 960-1215 MHz

Explanation

The range of signals that the low pass filters pass is 960-1215 MHz. This means that any signal with a frequency within this range will be allowed to pass through the low pass filters, while signals with frequencies outside of this range will be attenuated or blocked.

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24.

What is the operating band used by Joint Tactical Information Distribution System (JTIDS)?
- L-Band
- S-Band
- X-Band
- Ku-Band
Correct Answer

A. L-Band

Explanation

The operating band used by Joint Tactical Information Distribution System (JTIDS) is L-Band.

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25.

Which component in a pulse-modulation radar system controls the operation of the entire radar set?
- Antenna
- Indicator
- Transmitter
- Synchronizer
Correct Answer

A. Synchronizer

Explanation

The synchronizer is the component in a pulse-modulation radar system that controls the operation of the entire radar set. It ensures that the transmitter, antenna, and indicator are all synchronized and working together properly. Without the synchronizer, the radar system would not be able to accurately transmit and receive pulses, resulting in unreliable radar readings.

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26.

Which radar application is used primarily as an aid to navigation
- Search radar
- Ground mapping
- Terrain following
- Terrain avoidance
Correct Answer

A. Search radar

Explanation

Search radar is used primarily as an aid to navigation. It is designed to detect and track objects in the surrounding area, including ships, aircraft, and other navigational landmarks. By providing information about the location and movement of these objects, search radar helps navigators in determining their own position and avoiding potential collisions. It is commonly used in maritime and aviation industries for navigation purposes. Ground mapping, terrain following, and terrain avoidance radars serve different purposes such as mapping the terrain, maintaining a safe altitude above the ground, and avoiding obstacles respectively, but they are not primarily used for navigation.

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27.

When a Link-16 operator initiates the system using net number 127, then it indicates the use of a
- Subnet
- Stacked net
- Primary net
- Alternate net
Correct Answer

A. Stacked net

Explanation

When a Link-16 operator initiates the system using net number 127, it indicates the use of a stacked net. A stacked net is a configuration in which multiple nets are combined or stacked together to increase the capacity and efficiency of the network. This allows for better communication and coordination among multiple participants in the Link-16 network. By using a stacked net, the operator can access a larger pool of resources and improve the overall performance of the system.

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28.

In the Military-Standard (MIL-STD) 1553 data bus system, if the bus controller (BC) does not require the data for processing, then what type of command is being used?
- RT to BC
- BC to RT
- RT to RT
- BC to BC
Correct Answer

A. RT to RT

Explanation

If the bus controller (BC) does not require the data for processing in the MIL-STD 1553 data bus system, then the type of command being used is RT to RT. This means that the command is being sent from one remote terminal (RT) to another remote terminal (RT) without involving the bus controller.

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29.

Chips with circuits that can do the work of all the different parts of a computer are called
- Valves
- Microchips
- Circuit boards
- Microprocessors
Correct Answer

A. Microprocessors

Explanation

Microprocessors are chips with circuits that can perform the functions of all the different parts of a computer. They are the central processing units (CPUs) of computers, responsible for executing instructions and performing calculations. Microprocessors are essential components that enable computers to process data and perform tasks efficiently. They contain arithmetic logic units (ALUs), control units, and memory units, among other components, all integrated into a single chip. Therefore, microprocessors are the correct answer as they encompass the capabilities required to handle various computer tasks in a compact and efficient manner.

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30.

The main function of the switches within a network is to
- Build protocols to send across the network
- Forward frames of information over a network
- Generates a radio signal to extend range of a network
- Enable several users to send information over a network
Correct Answer

A. Enable several users to send information over a network

Explanation

Switches within a network enable several users to send information over a network. Switches are networking devices that connect multiple devices in a local area network (LAN) and allow them to communicate with each other. They receive data packets from one device and forward them to the intended destination device based on the destination MAC address. This enables multiple users to send and receive information simultaneously over the network, improving network efficiency and performance.

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31.

If 2 pounds of force is applied to the handle end of a 5-inch wrench, how much torque has been developed at the bolt end of the wrench?
- 2½-inch-pounds
- 5-inch-pounds
- 10-inch-pounds
- 20-inch-pounds
Correct Answer

A. 10-inch-pounds

Explanation

Torque is the measure of the force applied to rotate an object around an axis. It is calculated by multiplying the force applied by the distance from the axis of rotation. In this question, a 2-pound force is applied to the handle end of a 5-inch wrench. The torque developed at the bolt end of the wrench can be calculated by multiplying the force (2 pounds) by the distance from the handle end to the bolt end (5 inches). Therefore, the torque developed is 10-inch-pounds.

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32.

The operating modes of the TS-1843A Transponder test set are
- TEST and RF
- TEST and MONITOR
- CONFIDENCE and RF
- MONITOR and CONFIDENCE
Correct Answer

A. TEST and MONITOR

Explanation

The operating modes of the TS-1843A Transponder test set are TEST and MONITOR. This means that the test set can be used to perform tests on the transponder and also monitor its performance. The TEST mode allows for conducting various tests and measurements on the transponder, while the MONITOR mode enables continuous monitoring of the transponder's signals and performance. These operating modes provide flexibility and comprehensive functionality for testing and monitoring transponders.

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33.

Which key of a radio frequency tranmission line test set (RFTLTS) would you use to access the alpha portion of the alphanumeric key?
- DELETE
- SELECT
- ENTER
- TEST
Correct Answer

A. SELECT

Explanation

In a radio frequency transmission line test set (RFTLTS), the SELECT key is used to access different options or functions. The alpha portion of the alphanumeric key refers to the letters of the alphabet. Therefore, to access the alpha portion of the key, you would use the SELECT key.

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34.

In a pulse-modulation radar system, a high pulse repetition frequency radar limits range by
- Using less power
- Using more power
- Shortening listening time
- Lengthening listening time
Correct Answer

A. Shortening listening time

Explanation

In a pulse-modulation radar system, a high pulse repetition frequency (PRF) means that the radar is transmitting pulses at a faster rate. This results in shorter listening times between pulses. When the listening time is shortened, the radar has less time to receive and process the returning echoes from targets. As a result, the radar's range is limited because it is unable to detect targets that are located further away. Therefore, shortening the listening time is the correct answer for how a high PRF radar limits range.

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35.

Which of the following fields does the Link-16 friendly status reports contain?
- Activity
- Nationality
- Specific Type
- Equipment status
Correct Answer

A. Equipment status

Explanation

Link-16 friendly status reports contain information about the equipment status. These reports provide updates on the operational status and condition of the equipment being used in the Link-16 network. This information is crucial for maintaining situational awareness and ensuring effective communication and coordination among the participating units. By including equipment status in the reports, the Link-16 network can quickly identify any potential issues or malfunctions that may affect the overall operational effectiveness.

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36.

The basic element in a computer microchip is
- Silver
- Silicon
- Copper
- Aluminum
Correct Answer

A. Silicon

Explanation

Silicon is the correct answer because it is the main component used in computer microchips. Microchips are made from a material called a semiconductor, and silicon is the most commonly used semiconductor material due to its ability to conduct electricity under certain conditions. Silicon's unique properties make it ideal for use in microchips as it can be easily manipulated to create transistors, which are the building blocks of computer processors. Additionally, silicon has a high melting point and is resistant to heat, making it suitable for the high temperatures generated by microchips during operation.

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37.

Random access memory (RAM) is used to
- Provide secondary memory access
- Provide auxiliary storage capabilities
- Store computer operating information
- Store information being calculated by the computer
Correct Answer

A. Store information being calculated by the computer

Explanation

RAM, or Random Access Memory, is a type of computer memory that is used to store information being calculated by the computer. It is a volatile memory, meaning that its contents are lost when the computer is powered off. RAM allows the computer to quickly access and manipulate data that is currently being processed, providing temporary storage for the computer's calculations and operations. This allows for faster and more efficient computing, as the computer can access and update the necessary information in real-time.

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38.

If a radar echo returnes after 310 microseconds, how far away is the target?
- 10 miles
- 25 miles
- 50 miles
- 75 miles
Correct Answer

A. 25 miles

Explanation

The time it takes for a radar echo to return is directly proportional to the distance of the target. In this case, if the radar echo returns after 310 microseconds, it means that the target is located at a distance of 25 miles.

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39.

The function of a dummy load in search and weather radar is to
- Simulate a capacitive load
- Simulate a resistive load
- Prevent standing waves
- Simulate targets
Correct Answer

A. Simulate a resistive load

Explanation

A dummy load in search and weather radar is used to simulate a resistive load. This means that it mimics the electrical characteristics of a resistive load, which is a purely resistive element with no reactive components. By simulating a resistive load, the dummy load helps in testing and calibrating the radar system to ensure accurate readings and performance. It allows the radar system to operate as if it is detecting a real resistive target, providing a reliable reference for measurement and troubleshooting purposes.

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40.

When power is applied to the combined altitude radar altimeter, what is shown on the digital display?
- All eights
- All dashes
- The word INIT
- The word TEST
Correct Answer

A. All dashes

Explanation

When power is applied to the combined altitude radar altimeter, all dashes are shown on the digital display. This indicates that the altimeter is initializing and has not yet received any altitude data. Once the altimeter receives altitude information, the dashes will be replaced with the actual altitude reading.

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41.

What is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display?
- 5,000 feet
- 10,000 feet
- 25,000 feet
- 50,000 feet
Correct Answer

A. 5,000 feet

Explanation

The maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display is 5,000 feet.

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42.

What power source is used to provide emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data?
- Lithium batteries
- Sulphur dioxide batteries
- Nicked-cadmium batteries
- Nickel-metal hydride batteries
Correct Answer

A. Nicked-cadmium batteries

Explanation

Nickel-cadmium batteries are used to provide emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data. These batteries are known for their high energy density and long life span, making them suitable for backup power applications. They have the ability to provide a stable power supply during emergencies, ensuring that the JTIDS terminal can continue to function and maintain critical data without interruption.

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43.

Where does the radar transmitter in a pulse-modulation radar system send a small amount of energy for use as a time reference?
- Antenna
- Receiver
- Indicator
- Power Supply
Correct Answer

A. Receiver

Explanation

In a pulse-modulation radar system, the radar transmitter sends a small amount of energy to the receiver for use as a time reference. This is because the receiver needs to accurately measure the time it takes for the radar pulse to travel to the target and back. By using a small amount of energy from the transmitter as a time reference, the receiver can precisely calculate the distance to the target based on the time delay of the reflected pulse.

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44.

The maximum range of a pulse-modulation radar system primarily depends on
- Pulse shape
- Power output
- Pulse recurrence time
- Pulse repitition frequency
Correct Answer

A. Power output

Explanation

The maximum range of a pulse-modulation radar system primarily depends on the power output. A higher power output allows the radar system to generate stronger and more intense pulses, which can travel longer distances before they weaken and become indistinguishable from background noise. Therefore, a radar system with a higher power output will have a greater maximum range compared to a system with a lower power output.

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45.

What is the maximum number of Joint Tactical Distribution System (JTIDS) units (JU) that can participate in a Link-16 net?
- 7,777 JUs
- 4,092 JUs
- 32,766 JUs
- 524,284 JUs
Correct Answer

A. 32,766 JUs

Explanation

The maximum number of Joint Tactical Distribution System (JTIDS) units that can participate in a Link-16 net is 32,766 JUs.

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46.

What does the relative navigation (RELNAV) function of the Link-16 system determine?
- Time
- Distance
- Synchronization
- Geodetic position
Correct Answer

A. Distance

Explanation

The relative navigation (RELNAV) function of the Link-16 system determines the distance between two entities. It provides information on the spatial separation between the participating units, allowing them to accurately assess the distance between each other. This is crucial for effective coordination and communication in military operations, as it enables units to maintain proper spacing and avoid collisions or other spatial conflicts.

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47.

If the computer is receiving a binary code digit of 1, then that represents
- Pulse
- No-pulse
- On or off
- Pulse or no-pulse
Correct Answer

A. Pulse

Explanation

When the computer receives a binary code digit of 1, it represents a pulse. In binary code, 1 typically represents an "on" or "high" state, while 0 represents an "off" or "low" state. Therefore, the presence of a binary digit 1 indicates a pulse, meaning that the signal is active or switched on.

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48.

Horizontal deflection on the cathode-ray tube (CRT) on the time domain refloctometer (TDR) equates to
- Current
- Voltage
- Distance
- Reflected amplitude
Correct Answer

A. Distance

Explanation

The horizontal deflection on the cathode-ray tube (CRT) in a time domain reflectometer (TDR) corresponds to the distance. In TDR, the horizontal deflection represents the time it takes for a signal to travel from the source to a point of reflection and back. By measuring the horizontal deflection, the TDR can determine the distance to the point of reflection. Therefore, distance is the correct answer in this context.

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49.

The radio frequency tranmission line test set (RFTLTS) is used to diagnose cable faults through voltage standing wave ratio (VSWR)/ return loss measurements and
- Voltage tests
- Continuity tests
- Disturbance measurements
- Distance-to-fault measurements
Correct Answer

A. Distance-to-fault measurements

Explanation

The radio frequency transmission line test set (RFTLTS) is used to measure distance-to-fault in cable systems. This means that it can determine the location of any faults or disruptions in the cable. It does this by sending a signal down the cable and analyzing the reflections that occur when the signal encounters a fault. By measuring the time it takes for the reflection to return, the RFTLTS can calculate the distance to the fault. This information is crucial for troubleshooting and repairing cable systems.

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Current Version
Jul 02, 2024

Quiz Edited by
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Mar 22, 2016

Quiz Created by
Catherine Halcomb

2A251 Volume 5 UREs

What are the two processes in which Joint Tactical Information Distribution System (JTIDS) fine sychronization are accomplished?

Quiz Preview

Which radar application is used to produce a pictorial map of the terrain?

Which radar application sends data to compute time-to-go parameters?

The elapsed time indicator of the receiver/transmitter (R/T) indicates time power has been

What is the primary unit of any computer information system?

Before power is connected to the radio frequency transmission line test set (RFTLTS) you must ensure the ON/POWER/OFF switch is in the OFF position and a suitable grounding strap is connected between the grounding lug on the right side of RFTLTS unit 1 and the

Before using a dropped torque wrench, you must

Sealants keep out water, fumes and the atmosphere to protect the airframe against

To prevent interference and possible terminal shutdowns, what systems does the Tactical Information Gateway (TIG) system monitor?

In a frequency-shift radar system, the Doppler principle makes it possible to instantaneously sense and measure

The resolution of a computer monitor is expressed in the number of pixels that make up the image. The sharper the image, the

What power meter control compensates for a slight sensitivity associated with a particular type of power sensor

Which radar system is based on the Doppler principle?

Which component in a pulse-modulation radar set supplies the voltages that operate the other radar components?

In a frequency-shift radar system, what is the relationship between a transmitter/receiver(T/R) and an aircraft when the received frequency is lower that the transmitted frequency?

What is/are the function(s) of the SET knob located on the combined altitude radar altimeter indicator?

Which radar application is used to fly along a preselected altitude above the ground?

How many hops per second does a Tactical Digital Information Link (TADIL) J perform to preclude jamming by a narrow band jammer?

Which component of the Tactical Information Gateway (TIG) system enables beyond line-of-sight (BLOS) coverage

The primary computer memory that usually cannot be erased is called

In a pulse-modulation radar system, the transmitter does not interfere with the receiver. This is possible because the transmitter

When transmitting in the high power mode, what is the power output of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS)

What is the range of signals that the low pass filters pass?

What is the operating band used by Joint Tactical Information Distribution System (JTIDS)?

Which component in a pulse-modulation radar system controls the operation of the entire radar set?

Which radar application is used primarily as an aid to navigation

When a Link-16 operator initiates the system using net number 127, then it indicates the use of a

In the Military-Standard (MIL-STD) 1553 data bus system, if the bus controller (BC) does not require the data for processing, then what type of command is being used?

Chips with circuits that can do the work of all the different parts of a computer are called

The main function of the switches within a network is to

If 2 pounds of force is applied to the handle end of a 5-inch wrench, how much torque has been developed at the bolt end of the wrench?

The operating modes of the TS-1843A Transponder test set are

Which key of a radio frequency tranmission line test set (RFTLTS) would you use to access the alpha portion of the alphanumeric key?

In a pulse-modulation radar system, a high pulse repetition frequency radar limits range by

Which of the following fields does the Link-16 friendly status reports contain?

The basic element in a computer microchip is

Random access memory (RAM) is used to

If a radar echo returnes after 310 microseconds, how far away is the target?

The function of a dummy load in search and weather radar is to

When power is applied to the combined altitude radar altimeter, what is shown on the digital display?

What is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display?

What power source is used to provide emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data?

Where does the radar transmitter in a pulse-modulation radar system send a small amount of energy for use as a time reference?

The maximum range of a pulse-modulation radar system primarily depends on

What is the maximum number of Joint Tactical Distribution System (JTIDS) units (JU) that can participate in a Link-16 net?

What does the relative navigation (RELNAV) function of the Link-16 system determine?

If the computer is receiving a binary code digit of 1, then that represents

Horizontal deflection on the cathode-ray tube (CRT) on the time domain refloctometer (TDR) equates to

The radio frequency tranmission line test set (RFTLTS) is used to diagnose cable faults through voltage standing wave ratio (VSWR)/ return loss measurements and