2A672 Edit Code 7 Quiz

When troubleshooting any electrical system, it is important to start by identifying the last known source of power. This is because if there is a problem with the power source, such as a power outage or a tripped circuit breaker, it can cause the entire system to malfunction. By checking the last known source of power, the technician can determine if there is a problem with the power supply before proceeding with further troubleshooting steps.

If there is a loss of residual magnetism in the exciter field poles, the generator needs to be field flashed. Field flashing involves connecting the TB4-11 terminal to a 14 volt direct current (VDC) power source. This will restore the residual magnetism in the field poles and allow the generator to produce electricity. Checking the field transformer and fault display are also important steps in diagnosing and resolving the issue, but the immediate action required is to field flash the generator.

Prior to using the EPU-6/E frequency converter, it is necessary to inspect the air inlets for any blockages. This is important because blockages can restrict the airflow and lead to overheating of the converter. By ensuring that the air inlets are clear, proper ventilation can be maintained, allowing the converter to operate efficiently and prevent any potential damage.

When the size of the plates of a capacitor is increased, the distance between the plates decreases, resulting in an increase in capacitance. This is because capacitance is directly proportional to the area of the plates and inversely proportional to the distance between them. Therefore, increasing the plate size effectively increases the area, leading to an increase in capacitance.

The deswirl ring on an A/M32A-95 gas turbine compressor is designed to smooth turbulent air flow. Turbulent air flow can cause inefficiencies and disruptions in the compressor's performance. The deswirl ring helps to reduce turbulence by guiding the air in a more controlled manner, resulting in a smoother flow. This improves the overall efficiency and effectiveness of the compressor.

Valence electrons are the electrons located in the outermost energy level of an atom. These electrons have the highest energy because they are furthest from the nucleus and are involved in chemical bonding. The other options, such as stationary electrons, orbiting electrons, and K shell electrons, do not necessarily have the highest energy. Stationary electrons refer to electrons in a fixed state, while orbiting electrons and K shell electrons are more general terms that do not specify the energy level. Therefore, valence electrons are the correct answer for the electron that contains the most energy in an atom.

When there are eight electrons in the outermost shell of an atom, it is considered stable. This is because the outermost shell, also known as the valence shell, is considered complete when it has eight electrons. This configuration is known as the octet rule and is observed in many elements. Having a complete valence shell allows the atom to have a stable electron configuration, making it less likely to form chemical bonds or undergo reactions.

The torsion shaft is specifically designed to break if the engine locks up. This component is responsible for transmitting torque from the engine to the compressor and turbine. In the event of an engine lock-up, the torsion shaft is designed to fail and break, preventing further damage to the engine. This safety feature helps to protect the engine and other components from excessive stress and potential catastrophic failure.

When the A/M24T-16 load bank set load time has been reached, the load is automatically removed and the cooling cycle begins. This indicates that the load bank has finished the load test and is now entering a cooling phase to dissipate any heat generated during the test. This process ensures that the load bank is ready for the next test and prevents any damage or overheating.

The correct answer states that no action needs to be taken because this is normal operation. It explains that the blower clutch will only engage at the governed speed, which implies that it is not supposed to engage at 1,250 RPM. Therefore, there is no need to replace any parts or check any switches.

The A/M24T-16 load bank is designed to test both alternating current (AC) and direct current (DC) loads. It is capable of simulating various load conditions and is commonly used in testing and maintenance of power systems that utilize both AC and DC power sources. Additionally, the load bank can also test generator exciters, which are devices used to provide the necessary field current for the generator to produce electricity.

Electromagnetic induction refers to the phenomenon where a voltage is induced in a conductor when it moves relative to a magnetic field. This occurs due to the interaction between the magnetic field and the electrons in the conductor. As the conductor cuts through the magnetic field lines, the electrons experience a force that causes them to move, thereby generating an electric current. This process is the basis for the functioning of devices like generators and transformers.

When the main tanks are ¾ full on the A/M32A-60A gas turbine engine, fuel transfer to the main tanks stops. This means that once the main tanks reach 75% capacity, the fuel transfer process is halted. This is likely a safety feature to prevent overfilling of the main tanks and potential fuel spillage or other issues that could arise from excessive fuel levels.

The speed of the self-generating nitrogen servicing cart's (SGNSC) nitrogen booster compressor is determined by the programmable logic controller (PLC) circuit. The PLC circuit controls the operation of the compressor and regulates its speed based on the requirements of the system. This allows for efficient and optimal performance of the nitrogen booster compressor.

The major difference between a NPN and PNP transistor is the direction of current flow. In an NPN transistor, the current flows from the collector to the emitter, while in a PNP transistor, the current flows from the emitter to the collector. This difference in current flow direction is what determines the specific applications of each type of transistor.

Frosting of a refrigeration system line or component indicates a blockage. When there is a blockage in the system, the flow of refrigerant is restricted, causing a decrease in pressure and temperature. As a result, moisture in the air condenses on the surface of the blocked line or component, forming frost. This indicates that there is an obstruction in the system, which can affect the overall performance and efficiency of the refrigeration system.

A diode is a two-terminal device that allows current to flow in one direction and blocks it in the opposite direction. This is known as its ability to conduct in one direction and not the other.

To test the load contactor relay K1 using test probes, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the automatic position allows the relay to function according to the predetermined voltage control settings, which is necessary for testing the relay's operation. Placing the switch in any other position may disrupt the normal functioning of the relay and affect the test results.

The correct answer is S5, run/idle toggle switch. This switch is closed to provide potential to the exciter field while operating the B809A generator.

The torus assembly is the correct answer because it is responsible for accelerating hot expanding gases and directing them into the nozzle ring. The other options, such as the combustor can, combustor cap, and plenum, do not perform this specific function.

The emitter in a unijunction transistor always points toward the base 1 lead because the base 1 lead is the control terminal of the transistor. The emitter is responsible for emitting the majority charge carriers, and it needs to be connected to the base 1 lead in order to control the flow of current through the transistor. By pointing the emitter towards the base 1 lead, the transistor is able to function properly and perform its intended operations.

When the B809A generator set alternating current (AC) card senses an AC supply fault, the AC contactor opens and the generator output stops. This means that the connection between the generator and the electrical load is interrupted, causing the generator to stop supplying power. The opening of the AC contactor is a safety measure to prevent any potential damage to the generator or the electrical system in the event of an AC supply fault.

The correct answer is "Verification and resistance check." This answer implies that both verification and resistance check are used for maintenance and troubleshooting on the A/M24T-16 load bank. It suggests that these two boards are necessary for ensuring the load bank's proper functioning and identifying any potential issues or faults.

The best point to check voltage going to the A/M32A-86D generator exciter field is at J8, terminal D-F.

The magnetic pick-up is the correct answer because it is a component of the B809A generator set speed control system that produces a frequency pulse train for engine speed reference. This means that it detects the speed of the engine and generates a pulse train that can be used to control the speed of the generator set. The other options, engine speed governor, speed trim potentiometer, and speed control potentiometer, do not perform this specific function in the speed control system.

If K25 is energized during the operation of an A/M32A-60A, it means that its contacts are closed. This does not cause any interruption or malfunction in the unit's operation. Therefore, the unit continues to operate normally.

The given correct answer "Turbine Start" is the switch on the A/M32A-95 gas turbine compressor that initiates the automatic starting cycle. This switch is responsible for starting the turbine and beginning the process of compressing air. It is an essential component in the operation of the gas turbine compressor and plays a crucial role in the overall functioning of the equipment.

Air separator membranes (ASM) are the correct answer because they are components of self-generating nitrogen servicing carts (SGNSC) that are responsible for separating nitrogen from oxygen. These membranes use a selective permeation process to separate the two gases, allowing only nitrogen to pass through while oxygen is removed. This ensures that the nitrogen generated by the nitrogen generator (NG) is of high purity and suitable for various applications such as aircraft maintenance, industrial processes, and medical equipment. The nitrogen/air separator filters (NASF) and nitrogen separator membranes (NSM) mentioned are not directly involved in the separation process, making them incorrect choices.

A bridge rectifier is a circuit that converts alternating current (AC) into direct current (DC) by using a configuration of diodes. It allows the current to flow in only one direction, effectively eliminating the negative half of the AC waveform. This results in fullwave rectification, where both the positive and negative halves of the AC waveform are converted into a pulsating DC waveform. Therefore, the correct answer is that a bridge rectifier is installed in an AC circuit to provide fullwave rectification.

To turn off a silicon-controlled rectifier (SCR), the current must drop below the holding current. The holding current is the minimum current required to keep the SCR in the conducting state after it has been triggered. If the current falls below this threshold, the SCR will turn off and stop conducting. The holding current acts as a sort of "latch" to maintain the SCR's state until intentionally turned off.

During the operation of the EPU-6/E frequency converter, it has been determined that the E and F pin voltage is not required for the aircraft. In this case, the loop/bypass/28 V to aircraft switch should be placed in the BYPASS position. This means that the voltage will bypass the E and F pins and go directly to the aircraft, without passing through the converter.

The resistance of a material is affected by its area, temperature, and type of material. The area of a material determines how much current can flow through it, with larger areas allowing for more current. Temperature affects the resistance because as the temperature increases, the atoms in the material vibrate more, causing more collisions and increasing resistance. The type of material also plays a role, as different materials have different arrangements of atoms and different conductive properties, leading to varying levels of resistance.

A zener diode is connected in parallel to the load in order to protect it. When the voltage across the load exceeds the breakdown voltage of the zener diode, it starts conducting and provides a low resistance path for the excess current. This prevents the load from being damaged by the excessive voltage. By connecting the zener diode in parallel to the load, it ensures that the voltage across the load remains within a safe range.

The MA-3D heat sink is responsible for cooling the ethylene glycol/water solution.

The memory time delay relay is the probable cause of the trouble because when S13 is placed in the BUILD UP position, it activates the memory time delay relay. If the memory time delay relay is faulty or malfunctioning, it can cause the UNDERVOLTAGE light to come on.

The probable cause for the excessively high exhaust gas temperature during the operation of an A/M32A-60A generator set is the pneumatic thermostat. The pneumatic thermostat is responsible for regulating the temperature of the exhaust gases, and if it is not functioning properly, it can result in the temperature being too high. This could be due to a malfunction or a failure in the thermostat, causing it to not regulate the temperature effectively.

A loose push-on connector on the output filter capacitor could cause one phase voltage to be lower than the other two phases on the EPU-6/E frequency converter. This could result in a malfunction because the loose connection can lead to poor electrical contact, causing a decrease in voltage. As a result, one phase may receive less power compared to the other two phases, leading to an imbalance in the system and potential issues with the converter's performance.

When the butterfly valve is closed on an A/M32A-95 gas turbine compressor, chambers 1, 3, and 4 are pressurized.

In a series-parallel circuit, the total current (IT) is the sum of the currents in the parallel branches. Since I2 is given as 5 amps, and there are no other currents mentioned in the parallel branches, IT must be 5 amps.

Using Ohm's law, we know that the total current in a series circuit is equal to the sum of the currents in each component. Since I1 is given as 9 amps, and I3 is not listed, we can subtract I1 from IT to find I3.

IT - I1 = I3
5 amps - 9 amps = I3
-4 amps = I3

Therefore, the value of I3 is 4 amps and the value of IT is 9 amps.

The correct answer is "When input values are outside acceptable tolerances." This means that a current or voltage calibration on the A/M24T-16 load bank should be performed when the input values (current or voltage) deviate from the acceptable range or limits. Calibrations are necessary to ensure accurate and reliable measurements, and to maintain the load bank's performance within the specified tolerances. By calibrating the load bank when input values are outside acceptable tolerances, any inaccuracies or deviations can be corrected, ensuring the load bank operates properly and provides accurate results.

The electrostatic fields around a positive ion move outward. This is because positive ions have a deficiency of electrons, causing them to have a positive charge. As a result, the electric field lines originating from the positive ion move away from it, extending outward into the surrounding space. This movement of the electric field lines outward is a characteristic behavior of positive ions.

The correct answer is "Depletion region." In a semiconductor, the depletion region refers to the area where P-type material is joined to N-type material. This region is characterized by a lack of majority charge carriers due to the diffusion and recombination of electrons and holes. The depletion region plays a crucial role in the operation of semiconductor devices such as diodes and transistors.

If the arrow in a bipolar transistor is pointing away from the base, it indicates an NPN transistor. In an NPN transistor, the majority charge carriers are negative electrons, and the arrow symbolizes the direction of the conventional current flow. The base region in an NPN transistor is P-type, and the emitter and collector regions are N-type.

The correct answer is Emitter, base 1, and base 2. In a unijunction transistor (UJT), the emitter is the terminal from which the majority carriers (electrons) are emitted. Base 1 and base 2 are the two terminals that control the conduction of the UJT. The voltage applied to base 1 controls the emitter current, while the voltage applied to base 2 controls the conduction between emitter and base 1.

The injector pump is responsible for distributing and delivering an accurate amount of fuel to the engine cylinders. It is a key component in the fuel system of the B809A generator set. The injector pump ensures that the fuel is delivered at the right pressure and timing to optimize the combustion process in the engine. Without the injector pump, the engine may not receive the correct amount of fuel, leading to poor performance and potential damage.

Mutual induction is the correct answer because it refers to the process in which a changing current in one coil induces a voltage in another coil that is in close proximity. This is the fundamental principle behind the operation of a transformer, where the primary coil induces a voltage in the secondary coil through mutual induction.

The contacts on the annunciator card of the B809A generator set that control the AC input to the voltage regulator are referred to as "Generator fault." These contacts are responsible for monitoring and detecting any faults or issues related to the generator's operation. If there is a fault in the generator, these contacts will signal the voltage regulator to take appropriate action to rectify the problem and ensure the smooth operation of the generator set.

The valence band of an intrinsic semiconductor has 4 electrons. In an intrinsic semiconductor, the valence band is fully occupied by electrons, and it is the highest energy band that electrons can occupy at absolute zero temperature. The valence band plays a crucial role in the electrical conductivity of the semiconductor as it determines the availability of electrons for conduction.

The firing time of a unijunction transistor (UJT) is controlled by the resistance and capacitance in the circuit. The resistance determines the charging and discharging time of the capacitor, which in turn affects the firing time of the UJT. By adjusting the values of resistance and capacitance, the firing time of the UJT can be controlled, allowing for precise timing in electronic circuits.

The probable cause of the voltage not building up in the A/M32A-86D generator set is that the K23 contacts are open.