2A652 Aerospace Ground Equipment CDC's (Vol 2)

Resistance is used to control current flow in a circuit. It is a property of a material that opposes the flow of electric current. When resistance is increased, the current flow decreases, and when resistance is decreased, the current flow increases. Therefore, by adjusting the resistance in a circuit, the amount of current flowing through it can be controlled.

A magnet creates a magnetic field around itself, which is the region where its influence can be felt. This field is responsible for the attraction or repulsion of other magnets or magnetic materials. The saturation principle refers to the maximum magnetic field strength that a material can achieve. Magnetic theory is a broad term that encompasses various principles and concepts related to magnets. The law of attraction and repulsion is a general principle that describes how magnets interact with each other. Therefore, the correct answer is magnetic field.

Residual magnetism refers to the magnetism that remains in a material even after the magnetizing force has been removed. This phenomenon occurs due to the alignment of magnetic domains within the material, which causes it to retain a magnetic field. Residual magnetism is commonly observed in permanent magnets and is important in various applications such as in the storage of data on hard drives and in the functioning of electric motors and generators.

A relay is an electrically operated switch. It is a device that allows a small electrical current to control a larger electrical current. When the small current is applied to the relay, it activates an electromagnet, which then switches the larger current on or off. This makes a relay a useful component in various electrical systems, as it allows for the control of high-power circuits with low-power signals. Therefore, the correct answer is switch.

The magnetic field of an electromagnet can be varied by changing the type of core, the number of turns in the coil, and the amount of current through the coil. The type of core affects the permeability of the material, which determines how easily the magnetic field can pass through it. Increasing the number of turns in the coil increases the strength of the magnetic field. Finally, increasing the amount of current flowing through the coil increases the strength of the magnetic field according to Ampere's law. Therefore, all of these factors can be used to vary the magnetic field of an electromagnet.

An atom with eight electrons in its outermost shell is said to be stable. This is because the outermost shell, also known as the valence shell, is considered to be complete when it contains eight electrons. This configuration is known as the octet rule and is commonly observed in noble gases, which are known for their stability. Having a complete outer shell allows the atom to have a lower energy state and be less likely to react with other atoms to gain or lose electrons.

Voltage is the correct answer because it refers to the potential difference between two points in a circuit that exerts a force on free electrons. It is the measure of electric potential energy per unit charge and is responsible for the flow of electric current in a circuit. Conductivity is a property that determines how well a material can conduct electricity, current is the flow of electric charge, and valence refers to the combining capacity of an element.

The systematic method is the best method of troubleshooting because it involves a logical and organized approach to problem-solving. It helps to identify the root cause of the issue by breaking it down into smaller steps and systematically testing each component or variable. This method ensures that all possible causes are considered and eliminates the need for guesswork or random attempts to fix the problem. It saves time and resources by providing a structured framework for problem-solving, leading to more efficient and effective troubleshooting.

Current is the correct answer because it refers to the flow or drift of electrons through a conductor in the same direction at the same time. Conductivity is the measure of a material's ability to conduct electric current, voltage is the potential difference between two points in a circuit, and valence refers to the combining capacity of an atom.

In a series circuit, the current is the same throughout the circuit. To calculate the current, we can use Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R). In this case, the voltage is 24 volts and the resistance is 18 ohms. Therefore, the current through the resistor would be 24 volts divided by 18 ohms, which equals 1.33 amps.

The term "dielectric" is used to refer to insulators. Insulators are materials that do not conduct electricity easily and have high resistance to the flow of electric current. Dielectrics are commonly used in capacitors and other electronic devices to store and control electrical energy. Unlike conductors, which allow the flow of electric charges, insulators prevent or greatly reduce the flow of charges. Therefore, the correct answer for this question is insulators.

In order to generate a voltage through electromechanical means, a conductor is necessary. A conductor is a material that allows the flow of electric current. When there is relative motion between a magnetic field and a conductor, it induces a voltage in the conductor due to electromagnetic induction. This voltage can be generated only if there is a complete circuit, which allows the flow of current. Therefore, a conductor is an essential component for electromechanical voltage generation.

The winding of a transformer that is connected to a power source is known as the primary winding. This is because the primary winding receives the electrical energy from the power source and transfers it to the secondary winding through electromagnetic induction. The primary winding typically has a higher number of turns compared to the secondary winding to step up or step down the voltage as required.

A good conductor requires only 3 valence electrons. Valence electrons are the outermost electrons in an atom's electron cloud, and they are responsible for the atom's ability to bond with other atoms. In the case of conductors, atoms with fewer valence electrons are more likely to easily lose or share electrons, allowing the flow of electric current. Therefore, atoms with 3 valence electrons are more likely to be good conductors.

When a soldering iron tip becomes pitted or worn, it can affect the quality of solder joints. To redress the tip, it should be tinned. Tinning refers to the process of applying a thin layer of solder to the tip, which helps to improve heat transfer and prevent oxidation. By tinning the tip, it restores its functionality and ensures proper soldering. Therefore, the correct answer is tinned.

Electromagnetic induction is the principle behind all electromechanical generation. It refers to the production of an electromotive force (emf) in a conductor when it is exposed to a changing magnetic field. This process involves the movement of the conductor through the magnetic field or the variation of the magnetic field around the conductor. By utilizing electromagnetic induction, generators can convert mechanical energy into electrical energy, which is the basis for electromechanical generation.

A reference designation index is a troubleshooting aid that is designed to aid you if you see an unfamiliar symbol. It provides a list or index of reference designations used in a schematic or wiring diagram, allowing you to quickly identify and understand the meaning of unfamiliar symbols. This index helps in locating the relevant information or component in the diagram, making troubleshooting easier and more efficient.

The best method of repairing a lifted circuit track on a printed circuit board (PCB) is to replace it with insulated wire. This is because insulated wire provides better protection against short circuits and ensures that the repaired track does not come into contact with other conductive elements on the PCB. Bonding or gluing the lifted track may not provide sufficient electrical insulation, while replacing it with bare wire may lead to potential short circuits. Therefore, replacing it with insulated wire is the most effective solution for repairing a lifted circuit track on a PCB.

Zones are a troubleshooting aid that is designed to aid you in finding components on a diagram. Zones divide a diagram into different sections, making it easier to locate specific components or areas of interest. By using zones, you can quickly identify the location of components and troubleshoot any issues more efficiently.

A relay that, once energized, requires a second coil to be energized before the contacts will return to their original positions is called a latching relay. This type of relay is designed to "latch" or hold its position even after the initial energizing signal is removed. It requires a separate signal to be sent to the second coil in order to reset the contacts to their original positions. Latching relays are commonly used in applications where it is important to maintain a specific state or position until intentionally changed.

In a capacitor, the dielectric is the insulator. The dielectric is a non-conductive material that is placed between the two conductive plates of the capacitor. It helps to increase the capacitance of the capacitor by reducing the electric field between the plates. The dielectric material acts as an insulator, preventing the flow of electric current between the plates while allowing the storage of electrical energy in the form of an electric field.

Mutual induction is the process by which a current change in one coil induces a voltage in another coil. This occurs when the changing magnetic field produced by the current in the first coil passes through the second coil, creating an electromotive force (EMF) and inducing a current in the second coil. This phenomenon is widely used in the operation of transformers and is essential for the transmission of electrical energy over long distances.

When a diode is placed in reverse bias, it allows only a small leakage current to flow through it. This makes it effective in protecting the circuit from voltage spikes or surges. When a spike or surge occurs, the diode quickly conducts and redirects the excess voltage away from the circuit, preventing damage to the components. Therefore, a diode in reverse bias acts as a spike protector.

Electrostatic sensitive devices need to be handled with caution to prevent damage from electrostatic discharge. One way to identify such devices is by looking for the MIL-STD-129 symbol or a caution marking on the package. This marking indicates that the device is sensitive to electrostatic discharge and requires special handling procedures. By recognizing this marking, individuals can take appropriate precautions to prevent damage to the device and ensure its safe handling and use.

A transformer is a device that is used to transfer electrical energy from one circuit to another through electromagnetic induction. It consists of two coils, known as the primary and secondary coils, which are wound around a common iron core. The primary coil is connected to a power source, and the secondary coil is connected to the load. The transformer operates based on the principle of mutual induction, where a changing current in the primary coil induces a voltage in the secondary coil. Therefore, a transformer can change the voltage and current levels between the primary and secondary circuits. However, it does not change the power, as power is the product of voltage and current.

A capacitor stores energy in the form of an electrostatic field. When a voltage is applied across the capacitor, it creates an electric field between its plates. This electric field stores energy in the form of separated charges on the plates. The energy is stored in the electric field until it is discharged. This property of capacitors makes them useful in various electronic circuits for storing and releasing energy as needed.

Biasing refers to the process of applying a steady voltage or current to a device, such as a diode, in order to establish the desired operating conditions. In the case of a diode, biasing involves applying a voltage across the diode to either forward bias or reverse bias it, which in turn expands or contracts the depletion region within the diode. Therefore, the correct answer is biasing.

A schematic is a visual representation of a system, showing the relationships between its components and how they are connected. It provides a simplified and organized view of the system, making it easier to understand and troubleshoot. By looking at a schematic, one can quickly identify the different parts of the system and their functions, helping to promote a better understanding of how the system works and how to diagnose and fix any issues that may arise.

When performing a continuity check on a wire using the diode test mode, a good wire will register a beep. This is because a continuity check is used to determine if there is a continuous path for the electric current to flow through the wire. If there is a complete circuit, the multimeter will emit a beep to indicate that the wire is not broken or damaged and can conduct electricity properly.

When soldering flat perforated terminals, a 180 degree wrap is used to connect the conductor to the terminal. This means that the conductor is wrapped around the terminal in a half-circle shape, creating a secure and reliable connection. This wrap provides a larger surface area for the solder to adhere to, ensuring a strong bond between the conductor and the terminal. It also helps to prevent the conductor from coming loose or disconnecting over time.

In a series-parallel circuit, the total current flowing through the parallel portion of the circuit remains the same. This is because the current has multiple paths it can take in the parallel portion, but the total current entering the parallel portion must be equal to the total current leaving it. On the other hand, in the series portion of the circuit, the current divides according to the component resistance. This is because the current has only one path to flow through in the series portion, and the components in that portion offer different levels of resistance, causing the current to divide accordingly.

A zener diode is designed to operate in reverse bias. It conducts a small current until the avalanche point is reached, which is the point where the diode starts to break down and conduct a larger current. Once the avalanche point is reached, the zener diode will continue to conduct in reverse bias and maintain a constant voltage across its terminals, even if the current increases. Therefore, the statement "once the avalanche point has been reached" correctly explains when a zener diode will conduct in reverse bias.

When a light emitting diode (LED) is forward biased, it means that the positive terminal of the power supply is connected to the anode of the LED and the negative terminal is connected to the cathode. In this configuration, current flows freely through the LED, allowing it to emit light. The forward biasing causes the electrons and holes to recombine at the junction of the LED, releasing energy in the form of photons, which results in the production of light.

An LED typically operates at an approximate voltage of 1.6 volts. This voltage is necessary to overcome the forward voltage drop across the diode junction and allow current to flow through the LED, causing it to emit light. The specific voltage may vary depending on the type and color of the LED, but 1.6 volts is a commonly accepted value for many LEDs.

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The correct answer is "wire touches the bottom". This means that the wire is inserted into the solder cup until it reaches the bottom of the cup. This is an important step in the soldering process as it ensures a secure and reliable connection between the wire and the cup. By touching the bottom, the wire is properly positioned and ready for soldering to take place.

In a parallel circuit, the source current will be divided among the different branches based on their resistances. Each branch offers a different amount of resistance to the flow of current. The branch with lower resistance will allow more current to pass through it, while the branch with higher resistance will allow less current to pass through it. This division of current is determined by the relative resistance values of each branch in the circuit. Therefore, the correct answer is resistances.

In a parallel circuit, the total resistance is calculated using the formula 1/Rt = 1/R1 + 1/R2 + 1/R3 + ... In this case, there are two branches with different voltages and currents. To find the resistance of each branch, we can use Ohm's law: R1 = V1/I1 and R2 = V2/I2. Plugging in the values, we get R1 = 440V/4A = 110 ohms and R2 = 440V/16A = 27.5 ohms. Adding the reciprocals of these resistances gives us 1/Rt = 1/110 + 1/27.5 = 0.009 + 0.036 = 0.045. Taking the reciprocal of this sum, we get Rt = 1/0.045 = 22 ohms.

The silicon controlled rectifier (SCR) has three PN junctions. The SCR is a four-layer, three-terminal semiconductor device that acts as a switch. It consists of three PN junctions: the anode-cathode junction, the anode-gate junction, and the cathode-gate junction. The anode-cathode junction is the main junction through which current flows when the SCR is forward-biased. The anode-gate and cathode-gate junctions are used to control the SCR's conduction by applying a small current to the gate terminal. Therefore, the correct answer is three.

A heat sink is a device used in soldering to prevent heat from damaging other components in the circuit. When soldering, excessive heat can be generated, which can potentially damage nearby components. By using a heat sink, the excess heat is absorbed and dissipated, preventing it from reaching and damaging other components. This helps to ensure the integrity and functionality of the circuit during the soldering process.

Increasing the amount of motion would be the most difficult method to increase the output in a simple generator. This is because increasing the motion requires more mechanical energy, which can be challenging to achieve. On the other hand, increasing the area of the conductor, the strength of the magnetic field, or the relative resistance can be relatively easier to accomplish and can result in higher output.

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of semiconductor device that has a gate that is not electrically connected to the rest of the device. The gate of a MOSFET is insulated from the channel by a thin layer of oxide, allowing for control of the flow of current through the device. This isolation of the gate from the rest of the device allows for high input impedance and low power consumption, making MOSFETs suitable for a wide range of applications in electronics.

The emitter-base junction of a transistor is forward biased during normal operation. This means that the emitter terminal is at a higher potential than the base terminal. Forward biasing allows current to flow from the emitter to the base, which is necessary for the transistor to function properly. This biasing arrangement ensures that the transistor is in its active region, where it can amplify and control the current flowing through it.

In a series circuit, the current flowing through all the components is the same. Therefore, the total current in a series circuit is equal to the current through one component.

A good solder cup connection shows the contour of the wire. This means that the solder is evenly distributed around the wire, forming a smooth and uniform shape. This is important for ensuring a strong and reliable connection, as it indicates that the solder has properly adhered to the wire and filled any gaps or spaces. It also helps to prevent any potential issues such as cold solder joints or weak connections.

In a series-parallel circuit, the total current is equal to the sum of the currents in each branch. In this case, the series current is given as 6 amps (a) and one branch current is given as 2a. To find the total current, we need to add these two currents together, resulting in 6a. Therefore, the correct answer is 6a.

The amount of resistance in a circuit is one of the factors that determine the time required to charge a capacitor. Resistance limits the flow of current in the circuit, so a higher resistance will result in a slower charging time for the capacitor. This is because the resistance restricts the flow of electrons, reducing the rate at which the capacitor can accumulate charge. Therefore, a larger amount of resistance in the circuit will increase the time it takes to charge the capacitor.

Capacitive reactance is the opposition of a capacitor to alternating current (AC). When an AC voltage is applied to a capacitor, it charges and discharges, causing the flow of current to be out of phase with the voltage. This opposition to the flow of current is called capacitive reactance. It is measured in ohms and depends on the frequency of the AC signal and the capacitance of the capacitor. Capacitive reactance decreases with increasing frequency and increasing capacitance.

The bar graph of the 8025A multimeter provides an analog reading, which means it displays the measurement on a continuous scale rather than in discrete numerical values. This allows the user to quickly interpret the measurement by observing the position of the bar on the graph. The analog reading is a visual representation that complements the digital display, operating mode, and range indication provided by the multimeter, enhancing the user's understanding of the measurement.

A Field-Effect Transistor (FET) is a component that uses voltage to control the size of the current flow channel. When a voltage is applied to the gate terminal of a FET, it creates an electric field that controls the conductivity of the channel between the source and drain terminals. By varying the voltage applied to the gate, the size of the current flow channel can be adjusted, allowing for precise control of the current flowing through the FET. This makes FETs widely used in applications such as amplifiers, switches, and voltage regulators.