2A672 Volume:1 Edit 6

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1. What is the simplest form of matter?

Explanation

An element is the simplest form of matter because it consists of only one type of atom. It cannot be broken down into simpler substances by chemical means. In contrast, a compound is made up of two or more different elements chemically combined, while a mixture is a combination of different substances that are not chemically bonded. Electrons are subatomic particles and not a form of matter on their own. Therefore, the correct answer is element.

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About This Quiz
Atomic Models Quizzes & Trivia

This quiz, titled '2A672 VOLUME:1 EDIT 6', tests knowledge on basic atomic structure, including the nature of elements, electron energy levels, stability of atoms, electrical properties, and fundamental... see moreforces like voltage. It's designed for learners to assess their understanding of physics concepts. see less

2. When troubleshooting any electrical system, you can locate a starting point by first finding the

Explanation

When troubleshooting any electrical system, locating the last known source of power can help determine where to begin. By identifying the last point in the system where power was present, it becomes easier to trace the issue and identify potential causes of the problem. This starting point can provide valuable information about the flow of power and help narrow down the areas that need to be inspected or tested.

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3. In an atom, what electrons contain the most energy?

Explanation

Valence electrons contain the most energy in an atom. Valence electrons are the outermost electrons in an atom's electron cloud and are involved in chemical reactions. These electrons are farther from the nucleus and experience less attraction, resulting in higher energy levels. The other options, such as orbiting electrons and K shell electrons, are not necessarily incorrect, but they do not specifically refer to the electrons with the most energy.

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4. If the size of the plates or a capacitor is increased, how is capacitance affected?

Explanation

When the size of the plates or a capacitor is increased, the distance between the plates also increases. This results in an increase in the capacitance. Capacitance is directly proportional to the surface area of the plates and inversely proportional to the distance between them. Therefore, when the size of the plates or the capacitor is increased, the capacitance increases.

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5. What statement best discribes a diode?

Explanation

A diode is a semiconductor device that allows current to flow in one direction but blocks it in the opposite direction. This property is known as rectification and is the fundamental characteristic of a diode. It is commonly used in electronic circuits to control the flow of current and to convert AC to DC.

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6. If there are eight electrons in the outer most sheel of an atom, then its considered

Explanation

If there are eight electrons in the outermost shell of an atom, it is considered stable. This is because the octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with eight electrons in their outermost shell. Having a full outer shell of electrons makes the atom less likely to react with other atoms and more stable overall.

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7. What are factors that affect the resistance of a material?

Explanation

The factors that affect the resistance of a material are the area, temperature, and type of material. The area of the material affects the resistance because a larger area allows for more current to flow, resulting in lower resistance. The temperature of the material affects the resistance because as temperature increases, the resistance also increases. Lastly, the type of material affects the resistance because different materials have different resistivities, which determine their resistance.

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8. When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as

Explanation

Electromagnetic induction is the principle that explains the generation of voltage in a conductor when there is a relative motion between the conductor and a magnetic field. This phenomenon was discovered by Michael Faraday in the 19th century and is the basis for the functioning of generators and transformers. It is a fundamental principle in electromagnetism and plays a crucial role in various electrical and electronic devices.

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9. What gas turbine engine component is specifically designed to break if the engine locks up?

Explanation

The torsion shaft is specifically designed to break if the engine locks up. This is because the torsion shaft acts as a safety mechanism, absorbing the excessive torque and preventing damage to other components of the engine. By breaking, it releases the built-up energy and prevents further damage to the engine.

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10. What is the differnece between and open and a short?

Explanation

The correct answer explains that in an open circuit, there is no current flow, while in a shorted component, there is excessive current flow. This means that an open circuit acts as a break in the circuit, preventing the flow of current, while a shorted component creates a direct path for current to flow, resulting in an excessive amount of current.

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11. If you have loss of residual magnetism in the exciter field poles, what should you do?

Explanation

If there is a loss of residual magnetism in the exciter field poles, the correct action to take is to field flash the generator. Field flashing involves temporarily applying a direct current to the exciter field windings to restore the residual magnetism. This process helps to build up the magnetic field in the generator and enables it to produce electricity. By field flashing the generator, the loss of residual magnetism can be rectified and the generator can start functioning properly again.

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12. If a negative potential is connected to cathode and a positive potential is connected to anode of a PN junction, the diode is

Explanation

When a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is forward biased. In this configuration, the positive potential attracts the free electrons in the N-region towards the junction, while the negative potential attracts the holes in the P-region towards the junction. This creates a low resistance path for current to flow through the diode, allowing current to flow from the anode to the cathode. Therefore, the diode is forward biased in this scenario.

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13. What is the major difference between an NPN transistor and a PNP transistor?

Explanation

The major difference between an NPN transistor and a 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 due to the arrangement and polarity of the transistor's layers and junctions.

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14. What is the primary use of silicon-controlled rectifier (SCR)

Explanation

The primary use of a silicon-controlled rectifier (SCR) is as an electronic switch. An SCR is a semiconductor device that can control the flow of electric current. It can be turned on or off using a small control signal, allowing it to act as a switch in various electronic circuits. This makes it useful for applications such as power control, motor control, and lighting control, where precise switching of electrical currents is required.

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15. During operation of the AM32A-86D generator set, what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2000 revolutions per minute(RPM)?

Explanation

During operation of the AM32A-86D generator set, the control switch S13 should be placed in the "GENERATE" position to move the fuel rack and increase the engine speed to 2000 RPM. This position allows the generator to produce the necessary power output for generating electricity.

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16. What component of the A/M32A-86D generator set is used to manually increase output voltage?

Explanation

The voltage rheostat R61 is used to manually increase the output voltage of the A/M32A-86D generator set. A voltage rheostat is a variable resistor that can be adjusted to control the flow of current in a circuit, thereby changing the voltage. By adjusting the voltage rheostat R61, the user can manually increase the output voltage of the generator set to the desired level.

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17. In order to turn off a silicon-controlled rectifier(SCR) the current must drop below the

Explanation

The correct answer is holding current. When a silicon-controlled rectifier (SCR) is turned on, it requires a certain amount of current, known as the holding current, to keep it conducting. If the current drops below this holding current, the SCR will turn off. The holding current is necessary to maintain the conduction state of the SCR and prevent it from turning off unintentionally.

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18. What B809 generator set speed control system component produces a frequency pulse train for engine speed reference?

Explanation

The correct answer is Magnetic pick-up. A magnetic pick-up is a component of the B809 generator set speed control system that produces a frequency pulse train for engine speed reference. This pulse train is used by the system to regulate and control the speed of the engine.

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19. The electrostatic field around a positive ion move

Explanation

The electrostatic field around a positive ion moves outward. This is because positive ions have a deficiency of electrons, resulting in a net positive charge. The positive charge attracts negatively charged particles, causing the electrostatic field to extend outward from the ion.

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20. During operation of the A/M32-60A generator set, you notice the exhaust gas temperature is excessively hight. What is the probable cause of this?

Explanation

The probable cause of the excessively high exhaust gas temperature during operation of the A/M32-60A generator set is likely the pneumatic thermostat. The pneumatic thermostat is responsible for regulating the temperature of the exhaust gases, and if it is malfunctioning or not functioning properly, it can result in the temperature being too high. This can be a cause for concern as it can lead to overheating and potential damage to the generator set.

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21. In an inductive circuit, what is meant by current lags volatge by 90 degrees?

Explanation

In an inductive circuit, current lags voltage by 90 degrees means that the current reaches its maximum value when the voltage is at its minimum value, and vice versa. This is because in an inductive circuit, the current takes time to build up due to the presence of inductance, causing it to lag behind the voltage. When the voltage is at its maximum value, the current has not yet reached its maximum and is still increasing. Similarly, when the current is at its maximum value, the voltage has already started to decrease.

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22. What are the three leads in a unijunction transistor (UJT) called?

Explanation

The three leads in a unijunction transistor (UJT) are called emitter, base 1, and base 2.

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23. What action occurs when the B809 generator set alternation current (AC) card senses an AC supply fault?

Explanation

When the B809 generator set alternation current (AC) card senses an AC supply fault, the AC contactor opens and the generator output stops. This means that the electrical connection between the generator and the load is interrupted, preventing the generator from supplying power. The opening of the AC contactor is a safety measure to protect the generator and the connected equipment from potential damage caused by the AC supply fault.

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24. Refer to foldout 1. Where is the best point to check voltage to the A/M32A-86D generator exciter field?

Explanation

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

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25. Atoms having more then four electrons, but less than eight atoms are known as

Explanation

Atoms having more than four electrons but less than eight electrons in their outermost energy level are known as insulators. Insulators are materials that do not conduct electricity easily because their outermost energy level is almost full, making it difficult for electrons to move freely. This lack of mobility of electrons prevents the flow of electric current through the material, thereby making it a poor conductor of electricity.

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26. What is the basic principle of operation for transformers?

Explanation

The basic principle of operation for transformers is mutual induction. Mutual induction refers to the process where a changing current in the primary coil of a transformer induces a voltage in the secondary coil. This is achieved through the magnetic field generated by the primary coil, which then links and induces a voltage in the secondary coil. Mutual induction allows for the transfer of electrical energy from one coil to another without direct electrical connection, making transformers an essential component in electrical power distribution systems.

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27. What component controls the strenght of the A/M32A-86D generator exciter field L2?

Explanation

The voltage regulator VR1 controls the strength of the A/M32A-86D generator exciter field L2. This means that VR1 is responsible for regulating the voltage output of the generator, which in turn determines the strength of the exciter field. By adjusting the voltage, VR1 ensures that the exciter field is at the desired level, which is crucial for the proper functioning of the generator.

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28. What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?

Explanation

The power rating of a circuit is equal to the product of the current flowing through it and the resistance. In this question, the power rating is given as 40 watts and the total current is 2 amps. By rearranging the formula, we can calculate the resistance by dividing the power rating by the current. Therefore, the resistance in the circuit is 40 watts divided by 2 amps, which equals 20 ohms.

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29. In a series-parallel circuit, find RT (total resistance) if series resistor R1=7 ohms, and parallel resistor R2 and R3= 8 ohms.

Explanation

In a series-parallel circuit, the total resistance (RT) is calculated by adding the resistances in the series portion and the reciprocal of the sum of the reciprocals of the resistances in the parallel portion. In this case, the series resistor R1 is 7 ohms, and the parallel resistors R2 and R3 are 8 ohms each. The sum of the series resistors is 7 ohms. The reciprocal of the sum of the reciprocals of the parallel resistors is 1/((1/8)+(1/8)) = 4 ohms. Adding the series and parallel portions, we get 7 ohms + 4 ohms = 11 ohms, which is the total resistance (RT) in the circuit.

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30. In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed. Use Ohm's law to find the value of I3 and IT.

Explanation

In a series-parallel circuit, the total current (IT) is equal to the sum of the currents in the series and parallel branches. In this case, the series current (I1) is given as 9 amps and the parallel current (I2) is given as 5 amps. To find the total current, we add these two currents together: IT = I1 + I2 = 9 + 5 = 14 amps. Since the value of I3 is not listed, we cannot determine its value. Therefore, the correct answer is I3 = 4 amps and IT = 9 amps.

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31. Which step in troubleshooting is considered the most difficult?

Explanation

Analysis is considered the most difficult step in troubleshooting because it involves carefully examining and evaluating the data and information gathered during the recognition and verification, isolation and elimination, and repair and check steps. It requires a deep understanding of the problem, the ability to identify patterns or trends, and the skill to determine the root cause of the issue. Analysis often involves complex problem-solving techniques and may require additional research or expertise to reach a resolution.

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32. The portion of the voltage regulator that supplies exciter field voltage is tranformer

Explanation

The correct answer is (T1) and rectifier (CR26). This is because the exciter field voltage is supplied by the transformer (T1) and rectifier (CR26) combination. The transformer steps up or steps down the input voltage to the desired level, and the rectifier converts the alternating current (AC) output of the transformer into direct current (DC) to supply the exciter field voltage.

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33. The area of a semiconductor where the P-type material is joined tp N-type materials is known as

Explanation

The correct answer is depletion region. In a semiconductor, the depletion region refers to the area where the P-type material and N-type materials are joined. This region is created due to the diffusion of charge carriers and the formation of a depletion layer, which results in a lack of free charge carriers. The depletion region plays a crucial role in the operation of semiconductor devices such as diodes and transistors.

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34. The force required to move free electrons through a conductor is known as

Explanation

Voltage is the correct answer because it represents the force or electric potential difference that drives the movement of free electrons through a conductor. It is the measure of the energy per unit charge required to move the electrons, and it determines the rate of flow of electric current. The greater the voltage, the stronger the force pushing the electrons, and the higher the current.

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35. The emitter in a unijunction transistor (UJT) always points towards the

Explanation

In a unijunction transistor (UJT), the emitter always points towards the base 1 lead. This is because the base 1 lead is connected to the emitter region of the UJT. The emitter is responsible for emitting the majority charge carriers (electrons or holes) into the base region, which then controls the conductivity of the UJT. By pointing the emitter towards the base 1 lead, the UJT is able to properly function and regulate its conductivity.

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36. What component on a B809 generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?

Explanation

The injection pump is responsible for distributing and delivering an accurate amount of fuel to the engine cylinders in a B809 generator set fuel system. It ensures that the correct amount of fuel is injected into each cylinder at the right time, allowing for efficient combustion and optimal engine performance. The injection pump plays a crucial role in maintaining the fuel system's functionality and ensuring that the engine receives the necessary fuel supply.

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37. What condition is sense by the direct current (DC) card on the B809 generator set?

Explanation

The direct current (DC) card on the B809 generator set senses the condition of overtemperature. This means that the DC card is designed to detect and monitor the temperature of the generator set. If the temperature exceeds a certain threshold, the DC card will trigger an alarm or shut down the generator to prevent damage from excessive heat. This is an important safety feature to protect the generator set and ensure its proper functioning.

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38. While operating an A/M32A-86D at governor speed, you place S13 in the build up position and the undervoltage light comes on. What is a probable cause for this trouble?

Explanation

The probable cause for the undervoltage light coming on when placing S13 in the build-up position while operating an A/M32A-86D at governor speed is the memory time delay relay. This relay is responsible for providing a delay in the operation of certain components, and if it is malfunctioning or not functioning at all, it can cause the undervoltage light to come on.

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39. What section of the A/M32A-60 gas turbine engine load control valve controls the opening time?

Explanation

The rate control section of the A/M32A-60 gas turbine engine load control valve controls the opening time. This means that the rate control mechanism determines how quickly or slowly the valve opens, allowing for precise control over the amount of gas flowing through the turbine engine. This section is responsible for regulating the rate at which the valve opens, ensuring optimal performance and efficiency of the engine. The diaphragm, load control, and mechanical linkage sections may play other roles in the valve's operation, but they do not specifically control the opening time.

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40. In what type of circut(s) does a capacitor oppose any change in voltage?

Explanation

A capacitor opposes any change in voltage in AC circuits because it can store and release electrical energy in response to alternating current. As the AC voltage changes direction, the capacitor charges and discharges, creating a phase shift between the voltage and current. This opposition to voltage change is due to the ability of the capacitor to store charge and resist sudden changes in voltage. In DC circuits, the capacitor charges to a steady voltage and does not oppose any change in voltage, making it ineffective in this case. Therefore, the correct answer is AC.

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41. An A/M32A-86D is operation and the alternating current (AC) votlmeter is readin 200 volts alternating current (VAC) on all three phases. What do you do?

Explanation

Switch S15 to the L-N position. This is the correct answer because if the AC voltmeter is reading 200 volts AC on all three phases, it indicates that the voltmeter is currently measuring the voltage between two phases (L-L) instead of between a phase and neutral (L-N). By switching S15 to the L-N position, the voltmeter will now measure the correct voltage between a phase and neutral. Adjusting VR1 or R61 would not be necessary in this situation as the issue is with the position of the switch.

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42. In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)

Explanation

During the first cycle of alternating current (AC) in a circuit using a bridge rectifier, two diodes are forward biased. The bridge rectifier consists of four diodes arranged in a bridge configuration. During the positive half-cycle of the AC, two diodes become forward biased and conduct, allowing the current to flow through them. The other two diodes become reverse biased and do not conduct. This arrangement ensures that the AC input is converted into a pulsating DC output.

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43. The most positive point in a PNP  bipolar transistor is the

Explanation

The emitter is the most positive point in a PNP bipolar transistor because it is connected to the positive terminal of the power supply. This allows current to flow from the emitter to the base and collector, enabling the transistor to amplify signals and control the flow of current in the circuit. The emitter is responsible for emitting the majority charge carriers (electrons or holes) into the base region, which then controls the transistor's behavior.

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44. What transformer winding acts as a conductor and provides the path into which the voltage is induced?

Explanation

The secondary winding of a transformer acts as a conductor and provides the path into which the voltage is induced. When an alternating current is applied to the primary winding, it creates a changing magnetic field which induces a voltage in the secondary winding. This voltage can then be used to power electrical devices or be further transformed to different voltage levels. The secondary winding is typically connected to the load and is responsible for delivering the desired output voltage.

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45. To test the loas contactor relay K1, using test probes, in what position must the automatic-manual voltage control be placed?

Explanation

The correct answer is AUTOMATIC because in order to test the loas contactor relay K1, the automatic-manual voltage control must be placed in the automatic position. This is because the automatic position allows the voltage control to operate automatically, which is necessary for testing the relay. Placing it in any other position would not allow for proper testing of the relay.

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46. Apparent power is measured in

Explanation

Apparent power is the combination of real power and reactive power in an AC circuit. It is measured in kilo-volt-amperes (KVA) because it represents the total power consumed by the circuit, taking into account both the voltage and current. Kilowatts (KW) and kilo-volt-amperes (KVA) are similar, but KVA includes the reactive power component, which is important in determining the overall power requirements and sizing of electrical equipment. Kilo-watts-amperes (KWA) is not a standard unit of measurement and is not commonly used in electrical engineering.

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47. How is a zener diod connected in a circuit to regulate voltage?

Explanation

A zener diode is connected in parallel to the load in a circuit to regulate voltage. When connected in this way, the zener diode acts as a voltage regulator by maintaining a constant voltage across the load. It does this by conducting current in the reverse direction once the voltage across it exceeds its breakdown voltage. This ensures that the voltage across the load remains constant, even if the input voltage fluctuates. Connecting the zener diode in parallel to the load allows it to shunt excess current and maintain a stable voltage output.

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48. If the arrow in a bipolar transistor is pointing away from the base, what type of transistor is it?

Explanation

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

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49. What is the operating voltage of the blower motor control relay on the A/M24T-8 load bank?

Explanation

The operating voltage of the blower motor control relay on the A/M24T-8 load bank is 28 VDC.

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50. What are the minority carriers in a P-type material?

Explanation

In a P-type material, majority carriers are holes, which are created due to the presence of acceptor impurities. Minority carriers, on the other hand, are the carriers that are present in lower concentrations compared to the majority carriers. In a P-type material, the minority carriers are electrons. These electrons are thermally generated and are present in small numbers due to the low concentration of donor impurities in the material. Therefore, the correct answer is electrons.

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51. Refer to fouldout 2. While operating a B809A generator, what switch is closed to provide potential to the exciter field?

Explanation

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 exciter field is responsible for generating the magnetic field that induces voltage in the generator's stator windings. By closing the run/idle toggle switch, the exciter field is energized, allowing the generator to produce electricity.

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52. How is the zener diode connected in a circuit to protect the load?

Explanation

The 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 regulates the voltage, preventing it from exceeding a certain limit. This ensures that the load receives a constant voltage and is protected from any voltage spikes or surges.

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53. When an A/M32A-60 generator started, what component de-energizes at 95 percent?

Explanation

When an A/M32A-60 generator starts, the ignition unit de-energizes at 95 percent. This means that the ignition unit, which is responsible for initiating the combustion process in the generator, is no longer powered once the generator reaches 95 percent of its operating capacity. This is likely a safety measure to prevent any potential issues or malfunctions once the generator is fully operational.

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54. Your driving on the flight line and notice a A/M32A-86D power unit with all the fault lights on. You try to reset S23, but the lights stay on. What is the probable cause of this trouble?

Explanation

The probable cause of the trouble is that S30 is shorted. This means that there is a connection between the two terminals of S30, causing a malfunction in the power unit. As a result, even after attempting to reset S23, the fault lights remain on.

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55. What happens if the emitter-base (E-B) current is increased in a transistor amplifier?

Explanation

When the emitter-base (E-B) current is increased in a transistor amplifier, the current through the emitter-collector (E-C) circuit also increases. This is because the emitter-base junction acts as a forward-biased diode, allowing more current to flow from the emitter to the collector. As a result, the resistance in the E-C circuit decreases, allowing more current to flow through it. Therefore, the correct answer is that the current increases through the E-C circuit.

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56. Refer to foldout 1. During operation of the A/M32A-86D generator set, the low coolant light (DS50) illuminates, but the unit does not shut down. What is the probable cause of this touble?

Explanation

The probable cause of the low coolant light (DS50) illuminating but the unit not shutting down is that S55 and S48 are closed.

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57. Refer to foldout 5. The direct current (DC) voltmeter on the A/M32A-60A fails to indicate during operation. What is the probable cause of this trouble?

Explanation

The probable cause of the DC voltmeter on the A/M32A-60A failing to indicate during operation is that TR1 is defective.

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58. A junction diode has how many PN junction(s)?

Explanation

A junction diode has only one PN junction. A PN junction is formed when a P-type semiconductor is joined with an N-type semiconductor. This junction creates a barrier that allows current to flow in one direction and blocks it in the opposite direction. This characteristic of the PN junction is what makes a diode useful in various electronic applications such as rectification and switching.

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59. If the ignition control unit fails to operate on an A/M32A-60A during operation, what do you check?

Explanation

If the ignition control unit fails to operate on an A/M32A-60A during operation, the oil pressure switch S11 should be checked. The oil pressure switch is responsible for monitoring the oil pressure in the engine. If the oil pressure is too low, it can indicate a problem with the engine, which could be causing the ignition control unit to fail. Therefore, checking the oil pressure switch is important in diagnosing and resolving the issue with the ignition control unit.

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60. What signal powers the regulator card output pulse sent to the exciter field of the B809 generator?

Explanation

The regulator card output pulse sent to the exciter field of the B809 generator is powered by 110 VDC.

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61. Refer to fold out 1. You are operating an  A/M32A-86D generator set at governed speed, but voltage doesnt build up. what is the probable cause of this trouble?

Explanation

The probable cause of the trouble is that the K23 contacts are open. This means that there is a break in the circuit, preventing the voltage from building up.

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62. Refer to fold out 1. During operation check of the A/M32A-86D generator set, the shutdown solinoid energized immediatly after engine run indicator illuminated. What is the probable cause of this trouble?

Explanation

The probable cause of the shutdown solenoid energizing immediately after the engine run indicator illuminates is that S49 is shorted.

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63. What component of the A/M32A-60 gas turbine engine, lubrication system prevents  engine operation if oil pressure is too low?

Explanation

The oil pressure sequencing switch is responsible for preventing engine operation if the oil pressure is too low. This switch monitors the oil pressure and ensures that it reaches a minimum threshold before allowing the engine to start. If the oil pressure is below the required level, the switch will prevent the engine from operating to avoid potential damage or failure due to inadequate lubrication.

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64. A metal oxide varistor (MOV) is made up of how many semiconductors?

Explanation

A metal oxide varistor (MOV) is made up of two semiconductors. This is because a MOV is a type of voltage-dependent resistor that is commonly used to protect electrical devices from voltage surges or spikes. It consists of a ceramic material made up of zinc oxide grains, which act as the semiconductors. These grains are sandwiched between two metal plates, forming the structure of the MOV. When a voltage surge occurs, the semiconducting properties of the zinc oxide grains allow the MOV to conduct and absorb the excess energy, protecting the connected devices.

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65. What components of the voltage regulator compensates losses in the power cable by sensing change in current flow?

Explanation

The load rheostat is the component of the voltage regulator that compensates for losses in the power cable by sensing changes in current flow. It adjusts the resistance in the circuit to maintain a constant voltage output, compensating for any voltage drop caused by losses in the cable. This ensures that the desired voltage is delivered to the load, regardless of any variations in the current flow.

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66. The silicon-controlled rectifier (SCR) has how many layers?

Explanation

The silicon-controlled rectifier (SCR) is a four-layer semiconductor device that acts as a switch. It consists of three P-N junctions and four layers of alternating P-type and N-type material. The four layers are arranged in a specific order - P-N-P-N - which allows the SCR to control the flow of current in a circuit.

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67. What statement best describes a capacitive circuit?

Explanation

A capacitive circuit is characterized by the fact that the current flowing through it leads the applied voltage by 90 degrees. This means that the current reaches its maximum value before the voltage does. Capacitors store and release electrical energy, and this phase shift between current and voltage is a result of the way the capacitor charges and discharges.

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68. What controls the firetime in a unijuction transistor(UJT)?

Explanation

The firetime in a unijunction transistor (UJT) is controlled by the resistance and capacitance in the circuit. The resistance determines the charging rate of the capacitor, while the capacitance determines the time it takes for the capacitor to charge. Together, the resistance and capacitance determine the timing of the UJT's firing, making them crucial factors in controlling the firetime.

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69. Refer to folout 6. After you connect an A/M32A-60A to the A/M24T-8 load bank, you notice one of the blower motors isnt working ont the load bank. What is the probable cause of this trouble?

Explanation

The probable cause of the blower motor not working on the load bank is CR2.

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70. While you are operating the A/M32A-60 generator set, you turn the bleed air switch to ON and the engine speed drops to 98 percent. What is happening in the governor to bring the engine speed up to 100 percent?

Explanation

When the bleed air switch is turned on and the engine speed drops to 98 percent, it indicates that the governor is responding to the decrease in engine speed. In this case, the spring tension is greater than the centrifugal force, causing the flyweight to move inward. As a result, the bypass port is closed, which helps to increase the engine speed back to 100 percent.

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71. The current in a bipolar transistor that carries 5 percent of the current flow is the

Explanation

The correct answer is the control circuit. In a bipolar transistor, the control circuit is responsible for regulating and controlling the flow of current. It determines the amount of current that flows through the transistor by varying the voltage at the base terminal. The control circuit plays a crucial role in amplifying and switching signals in electronic devices.

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72. What effects does a defective K4 relay have on the A/M32A-86D generator output circut?

Explanation

A defective K4 relay would cause K607 to energize and K1 to de-energize in the A/M32A-86D generator output circuit.

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73. In a series-parallel circuit, total voltage is 2 volts, the value of E1 in the series portion of the circuit is unknown. There are two parallel branches (E2 = 3 volts) and the valueof E3 in the second parallel branch is unknown. Using Ohms law, find the value of E1 and E3.

Explanation

not-available-via-ai

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74. Refer to foldout 6. On an A/M24T-8 load bank, CR2 supplies 28 volts direct current (VDC) to operate the panel lights, the wind switch assembly, and the

Explanation

The correct answer is Blower motor B2. According to the information provided, CR2 supplies 28 volts direct current (VDC) to operate the panel lights, the wind switch assembly, the alternating current (AC) voltmeter, Transformer PT3, and Blower motor B1. Since Blower motor B2 is not mentioned in the list, it can be inferred that it does not receive power from CR2.

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75. Refer to fouldout 5. During operation of the A/M32A-60A, you close S3, but the alternationg current (AC) contactor light does not come on. What is the probable cause of this trouble?

Explanation

The probable cause of the trouble is that the K11 contacts C and D are opened. This means that there is a break in the circuit between the AC contactor light and the power source. As a result, the AC contactor light does not receive power and does not come on.

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76. Refer to fouldout 5. The A/M32A-60 generator set starts, but shuts down as soon as S7 is released. What is the probable cause of this trouble?

Explanation

The probable cause of the generator shutting down as soon as S7 is released is that K18 is de-energizing. When K18 de-energizes, it can cause the generator to shut down.

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77. Refer to fold out 1. During operation of the A/M32A-86D generator set, you get no response when you place S13 in the GENERATE position. A check of volateg at J8, terminal N, shows 12 volts direct current(VDC). What is a probable cause of this trouble?

Explanation

The probable cause of the trouble is that S53 is open. This means that the switch S53, which is responsible for generating power in the generator set, is not functioning properly. As a result, there is no response when S13 is placed in the GENERATE position. The check of voltage at J8, terminal N, shows 12 volts direct current (VDC), indicating that power is not being generated.

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78. Refer to fouldout 5. During operation of the A/M32A-60A, what happens if K25 is energized?

Explanation

If K25 is energized during operation of the A/M32A-60A, the unit will continue to operate normally. This means that the AC voltage will not drop off line, the contactors will not open and energize K11A, and the undervoltage light will not illuminate. The unit will function as intended without any disruptions or issues.

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79. Refer to foldout 1. An A/M32A-86D generator set is sent to the shop on a Red X for - will not apply power to the aircraft. Durirng the operation check, you place S5 in the closed position and contactor light illuminates. When you release the switch, the contactor opens. What is the probable cause of this trouble?

Explanation

The probable cause of this trouble is that R46 is open. This is indicated by the fact that when S5 is placed in the closed position and the contactor light illuminates, the contactor opens when the switch is released. R46 is likely a relay or a circuit breaker that is responsible for controlling the flow of power to the contactor. If R46 is open, it means that the circuit is not complete and power is not able to flow to the contactor, causing it to open when the switch is released.

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80. Refere to fouldout 2. During high voltage operation of the B809A generator set, what action occurs to prevent the direct current(DC) contactor from closing?

Explanation

During high voltage operation of the B809A generator set, the action that occurs to prevent the direct current (DC) contactor from closing is that the High Sense Relay (HSR) de-energizes. This means that the HSR stops receiving power and becomes inactive, thereby preventing the DC contactor from closing.

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81. Refer to foldout 5. During your operation check of the A/M32A-60A generator set, the unit runs at 80 percent and the ready to load light comes on. What do you check?

Explanation

In order to determine the cause of the "ready to load" light coming on during the operation check of the A/M32A-60A generator set running at 80 percent, it is necessary to check if the 95 percent centrifugal switch (S14) is closed. This switch is designed to open when the generator set reaches 95 percent of its maximum speed. If the switch is closed when the generator is only running at 80 percent, it indicates a potential issue with the switch or the generator's speed. Therefore, checking the status of the 95 percent centrifugal switch (S14) is the appropriate step to take in this situation.

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82. Refer to fold out 1. After performing an operational check of the A/M32A-86D generator set, you proceed to shut the unit down. After the generator stops, you notice the engine on light continues to glow. What is a probable cause of this trouble?

Explanation

The probable cause of the engine on light continuing to glow after shutting down the A/M32A-86D generator set is that S48 is closed.

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83. Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the A/M24T-8 load bank isnt working . What is the probable cause of this trouble?

Explanation

not-available-via-ai

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84. Refer to foldout 6 and 7. The alternating current (AC) voltmeter on an A/M24T-8A load bank indicates 120 colts alternating current (VAC) and the panel lights are working, but nothing happens when you turn the load selector switches. What is the probable cause of this trouble?

Explanation

The probable cause of the trouble is that K110 is open. This means that the load selector switch is not making a connection, which is why nothing happens when it is turned. The fact that the AC voltmeter indicates the correct voltage and the panel lights are working suggests that the power supply and circuitry are functioning properly. Therefore, the issue is likely isolated to the open K110 switch, which needs to be closed in order for the load to be activated.

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85. Refer to foldout 6. The alrternating current (AC) cable plugged into the A/M24T-8 load bank input panel and both blower motor are turning, but nothing happens when you turn the shock load switches on. What is the probable cause of this trouble?

Explanation

The probable cause of the trouble is that CR1 is malfunctioning. Since the AC cable is plugged in and the blower motors are turning, it indicates that there is power supply to the load bank. However, when the shock load switches are turned on, nothing happens. This suggests that the fault lies with CR1, which is responsible for controlling the flow of current to the load bank. If CR1 is malfunctioning, it would prevent the load bank from receiving the necessary current to operate properly.

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86. Refer to foldout 6 and 7. If CB2 opens on the A/M24T-8 load bank, what effect does it have on the load bank operation?

Explanation

If CB2 opens on the A/M24T-8 load bank, it will cause the alternating current (AC) load selection switches (S15 through S20) to stop working. This means that these switches will not be able to select and control the AC load on the load bank. The opening of CB2 disrupts the electrical circuit and prevents the switches from functioning properly.

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87. Refer to fouldout 5. During operation of the A/M32A-60A, the engine rotates, but there is no combustion. What is the probable cause of this trouble?

Explanation

The probable cause of the engine rotating without combustion during the operation of the A/M32A-60A is a faulty ignition system. The ignition system is responsible for igniting the fuel-air mixture in the engine, and if it is not functioning properly, combustion will not occur. This can be due to issues such as a malfunctioning spark plug, ignition coil, or ignition control module.

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88. Refer to foldout 6. You are testing a direct current (DC) generator and notice the panel lights and blower motor (B2) on the A/M24T-8 load bank are not working. Where would you start troubleshooting?

Explanation

To troubleshoot the issue with the panel lights and blower motor not working on the A/M24T-8 load bank, you would start by checking K2.

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Refer to fold out 1. During operation of the A/M32A-86D generator set,...
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