Age 2A672 (Vol 1)

  • AP Physics
  • AP Chemistry
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1. (005) If the size of the plates of a capacitor is increased, how is capacitance affected?

Explanation

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

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About This Quiz
Electronic Structure Quizzes & Trivia

The AGE 2A672 (Vol 1) quiz assesses knowledge on atomic structure, focusing on the properties of electrons, atom stability, and electrical principles. It is designed for learners aiming to understand the fundamental aspects of matter and electron behavior in atoms.

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2. (020) What action occurs when the B809A generator set alternating current (AC) card senses an AC supply fault?

Explanation

When the B809A generator set alternating current (AC) card senses an AC supply fault, the AC contactor opens. This means that the electrical circuit between the generator and the load is interrupted, resulting in the generator output stopping. Therefore, both the AC contactor opening and the generator output stopping occur as a result of the AC supply fault.

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3. (022) If you have a 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 appropriate action to take is to field flash the generator. Field flashing involves applying a temporary current to the field windings in order to restore the residual magnetism. This can be done by connecting TB4-11 to a 14 VDC power source, which will provide the necessary current to reestablish the magnetic field in the generator. Checking the field transformer and fault display may be relevant in diagnosing the issue, but field flashing is the specific action required to address the loss of residual magnetism.

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4. (018) 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 identify where the problem may have originated. By identifying the last point where power was present, it can narrow down the potential areas where a fault or issue may have occurred. This starting point can save time and effort in troubleshooting the electrical system.

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5. (016) What component on an A/M32A-86D generator is used to manually increase output voltage?

Explanation

The voltage rheostat R61 is used to manually increase the output voltage on an A/M32A-86D generator. A rheostat is a variable resistor that can be adjusted to control the flow of current in a circuit. By increasing the resistance with the voltage rheostat, the output voltage of the generator can be increased. The other options, such as the Auto/Manual switch S1, Test bank switch S202, and Excitation relay K16, do not have the specific function of manually increasing the output voltage.

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6. (023) 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 component is responsible for transmitting torque from the engine to the propeller or rotor. If the engine locks up, it can cause excessive torque and strain on the torsion shaft. By breaking, the torsion shaft prevents further damage to the engine and other components. This safety feature helps protect the engine and prevent catastrophic failure.

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7. (023) During the operation of a A/M32A-60A generator set, you noticed the exhaust gas temperature is excessively high. What is the probable cause of this trouble?

Explanation

The probable cause of the excessively high exhaust gas temperature in the A/M32A-60A generator set is the pneumatic thermostat. The pneumatic thermostat controls the temperature of the engine by regulating the flow of coolant. If the thermostat is faulty or stuck closed, it can cause the engine to overheat, resulting in high exhaust gas temperatures.

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8. (001) If there are eight electrons in the outer most shell of an atom, then it is considered

Explanation

An atom with eight electrons in its outermost shell is considered stable because it has achieved a full valence shell, which is the most stable configuration for an atom. The outermost shell, also known as the valence shell, is responsible for the atom's chemical behavior and interactions with other atoms. When the valence shell is complete with eight electrons, the atom is less likely to gain or lose electrons, making it stable and less reactive.

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9. (011) 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 of the semiconductor materials and the doping of the transistor.

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10. (015) During operation of the A/M32A-86D generator set, what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2,000 revolutions per minute (RPM)?

Explanation

During operation of the A/M32A-86D generator set, the control switch S13 should be placed in the GENERATE position in order to move the fuel rack and increase the engine speed to 2,000 RPM.

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11. (002) What is the difference between an open and a short?

Explanation

An open circuit refers to a break or discontinuity in the circuit, which prevents the flow of current. Therefore, there is no current flow in an open circuit. On the other hand, a short circuit occurs when there is an unintended connection between two points of a circuit with low resistance, causing excessive current flow. Hence, there is excessive current flow in a shorted component.

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12. (001) What is the simplest form of matter?

Explanation

The correct answer is Element. 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 through chemical means. Elements are represented by symbols on the periodic table and there are currently 118 known elements.

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13. (002) What are factors that affect the resistance of a material?

Explanation

The factors that affect the resistance of a material are its area, temperature, and type of material. The resistance of a material is directly proportional to its area, meaning that a larger area will result in higher resistance. Temperature also affects resistance, as an increase in temperature leads to an increase in resistance. Additionally, the type of material plays a role in resistance, as different materials have different resistivities.

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

Explanation

A silicon-controlled rectifier (SCR) is primarily used as an electronic switch. It is a semiconductor device that allows current to flow in one direction and blocks it in the opposite direction until triggered by a control signal. This makes it suitable for applications where precise control of power flow is required, such as in motor control, lighting control, and power supply circuits. It can handle high current and voltage levels, making it an efficient and reliable choice for switching applications.

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15. (003) 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 where voltage is induced into a conductor by the relative motion between the conductor and a magnetic field. This phenomenon was discovered by Michael Faraday in the early 19th century and is the basis for the operation of generators and transformers. It explains how electrical energy can be generated by moving a magnet through a coil of wire or by changing the magnetic field within a coil.

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16. (006) What statement best describes a diode?

Explanation

A diode is a two-terminal device that allows current to flow in only one direction and blocks it in the opposite direction. This is achieved by the presence of a PN junction, which acts as a one-way valve for electric current. When the diode is forward-biased, it allows current to flow freely, but when it is reverse-biased, it acts as an insulator and prevents current from passing through. Therefore, the statement "Has the ability to conduct in one direction and not the other" accurately describes a diode.

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17. (004) What is the basic principle of operation for transformers?

Explanation

The basic principle of operation for transformers is mutual induction. This means that when an alternating current flows through the primary coil, it creates a changing magnetic field which induces a voltage in the secondary coil. This voltage can be stepped up or stepped down depending on the ratio of turns in the primary and secondary coils. Mutual induction is the fundamental concept that allows transformers to efficiently transfer electrical energy from one circuit to another.

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

Explanation

The correct answer is "Rate control." In a gas turbine engine, the rate control section of the load control valve is responsible for controlling the opening time. This section regulates the speed at which the valve opens, allowing for precise control of the fuel flow and power output of the engine. The rate control mechanism ensures that the load control valve opens at the desired rate, maintaining optimal engine performance.

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19. (020) What condition is sensed by the direct current (DC) card on the B809A generator set?

Explanation

The direct current (DC) card on the B809A generator set senses the condition of overtemperature. This means that the card is designed to detect when the temperature of the generator set exceeds a certain threshold. This is an important feature as overheating can lead to damage or malfunction of the generator set, so it is crucial to monitor and address any temperature issues promptly.

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20. (010) In order to turn off a silicone-controlled rectifier (SCR), the current must drop below the

Explanation

When turning off a silicone-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 off state once it has been triggered. If the current drops below this threshold, the SCR will turn off. The trigger current, on the other hand, is the minimum current required to initially turn on the SCR. Variable current and breakdown current are not relevant to turning off the SCR.

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21. (002) 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

The given question provides information about the series current (I1 = 9 amps) and the current in one of the parallel branches (I2 = 5 amps). To find the value of I3 and IT, we can use Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). Since the resistance is not provided, we cannot directly calculate the values of I3 and IT. Therefore, the correct answer is "Not enough information to solve."

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22. (014) The portion of the voltage regulator that supplies exciter field voltage is transformer

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). The transformer steps down the voltage from the main power source, while the rectifier converts the alternating current (AC) into direct current (DC) to supply the exciter field. Therefore, (T1) and rectifier (CR26) are the components responsible for supplying the exciter field voltage in the voltage regulator.

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23. (016) 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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24. (001) In an atom, what electrons contain the most energy?

Explanation

Valence electrons contain the most energy in an atom. These are the electrons located in the outermost energy level or shell of an atom. Valence electrons are involved in chemical reactions and bonding with other atoms, which requires energy. Therefore, they have the highest energy compared to the electrons in other shells or energy levels.

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25. (019) What B809A 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 B809A generator set speed control system that produces a frequency pulse train for engine speed reference. This pulse train is used by the engine speed governor to regulate and control the speed of the generator set. The magnetic pick-up detects the rotation of the engine's flywheel and converts it into electrical signals, which are then used to adjust the fuel supply and maintain the desired engine speed.

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26. (007) The area of a semiconductor where P-type material is joined to N-type material is known as

Explanation

The area where P-type material is joined to N-type material in a semiconductor is called the depletion region. This region is formed due to the diffusion of charge carriers from one type of material to the other, creating a region depleted of majority charge carriers. This depletion region acts as a barrier to the flow of current, and it plays a crucial role in the operation of various semiconductor devices such as diodes and transistors.

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27. 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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28. (019) What component on the B809A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?

Explanation

The injector pump is the component on the B809A generator set fuel system that distributes and delivers an accurate amount of fuel to the engine cylinders. It is responsible for pressurizing the fuel and delivering it to the injectors at the correct time and in the correct quantity. The injector pump plays a crucial role in ensuring proper combustion and engine performance.

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29. (011) 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 negative electrons, and the arrow represents the direction of the conventional current flow. The arrow pointing away from the base signifies that the current flows from the emitter to the base and then to the collector in an NPN transistor.

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30. (017) While operating an A/M32A-86D at governed speed, you place S13 in the build up position and the undervoltage light comes on. what is a probable cause of this trouble?

Explanation

Placing S13 in the build up position on an A/M32A-86D at governed speed activates the memory time delay relay. The fact that the undervoltage light comes on suggests that there is a problem with the memory time delay relay. This relay is responsible for controlling the timing of certain functions, and if it is not functioning properly, it can cause the undervoltage light to come on. Therefore, the memory time delay relay is the probable cause of this trouble.

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31. (016) An A/M32A-86D is operating and the alternating current (AC) voltmeter is reading 200 volts alternating current (VAC) on all three phases. What do you do?

Explanation

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32. (031) Apparent power is measured in

Explanation

Apparent power is a measure of the total power in an electrical circuit, including both the real power (measured in kilowatts) and the reactive power. It is represented in kilo-volt-amperes (KVA), which takes into account the voltage and current in the circuit. This measurement is important in determining the capacity and sizing of electrical equipment, as it reflects the total power that needs to be supplied or handled by the system.

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33. (001) The electrostatic fields around a positive ion move

Explanation

The correct answer is outward because positive ions have a deficiency of electrons, resulting in an overall positive charge. As a result, the electrostatic field lines around a positive ion move away from the ion, indicating an outward direction. This movement occurs due to the repulsion between like charges, causing the field lines to spread out and move away from the positive ion.

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34. (009) How is a zener diode 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, regardless of variations in the input voltage. This is achieved by allowing current to flow through the zener diode when the voltage across the load exceeds the zener voltage, effectively limiting the voltage to the desired level.

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35. (033) What is the operating voltage of the blower motor and control relays on an A/M24T-8 load bank?

Explanation

The correct answer is 28 VDC. This means that the operating voltage of the blower motor and control relays on an A/M24T-8 load bank is 28 volts direct current.

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36. (016) What component controls the strength 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. A voltage regulator is responsible for maintaining a constant output voltage level regardless of changes in input voltage or load conditions. In this case, VR1 regulates the voltage supplied to the generator exciter field, which determines the strength of the field. By adjusting the voltage, VR1 controls the strength of the exciter field, ensuring that it is at the desired level for optimal generator performance.

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37. (025) While you are operating the A/M32A-60A 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

The correct answer explains that when the bleed air switch is turned on, the engine speed drops to 98 percent. In this situation, the governor needs to bring the engine speed back up to 100 percent. The explanation states that spring tension is greater than centrifugal force, causing the flyweights to move inward. This movement of the flyweights closes the bypass port, which helps increase the engine speed back to 100 percent.

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38. (S30) When an A/M32A-60A generator is started, what component de-energizes at 95 percent?

Explanation

When an A/M32A-60A generator is started, the component that de-energizes at 95 percent is the ignition unit. This means that the ignition unit stops receiving power or is turned off when the generator reaches 95 percent of its starting process.

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39. (018) Which step of troubleshooting is considered the most difficult?

Explanation

The step of troubleshooting that is considered the most difficult is analysis. This is because analysis involves examining all the available information, identifying patterns or potential causes of the problem, and making an informed decision on the best course of action to resolve the issue. It requires a deep understanding of the system or equipment being troubleshooted and the ability to critically think and problem solve.

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40. (018) To test the load contactor relay K1, using test probes, in what position must the automatic-manual voltage control switch be placed?

Explanation

To test the load contactor relay K1, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the load contactor relay is part of the automatic control system, and by placing the switch in the AUTOMATIC position, the relay will be activated and tested in its normal operating mode. Placing the switch in any other position, such as MANUAL, TEST, or OFF, would not properly test the relay in its intended operating mode.

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

Explanation

In a circuit using a bridge rectifier, there are two diodes that are forward biased during the first cycle of alternating current (AC). The bridge rectifier is a configuration of four diodes that allows the current to flow in one direction by alternating the forward bias of the diodes. During the positive half-cycle of the AC input, two diodes are forward biased and allow the current to flow through them, while the other two diodes are reverse biased and block the current. Therefore, the correct answer is 2.

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42. (013) 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 an MOV is a type of voltage-dependent resistor that is used to protect electrical devices from excessive voltage. It is made up of a ceramic material that contains zinc oxide, which acts as a semiconductor. When the voltage across the MOV exceeds its threshold, the zinc oxide conducts and absorbs the excess energy, protecting the connected device. Therefore, the correct answer is 2.

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43. (020) What signal powers the regulator card output pulse sent to the exciter field of the B809A generator?

Explanation

The regulator card output pulse sent to the exciter field of the B809A generator is powered by 110 VDC. This voltage is used to control and regulate the excitation of the generator's field, ensuring a stable and consistent output.

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44. (009) 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 provides a low-resistance path for the excess current to flow through. This prevents the voltage from rising further and protects the load from damage. Connecting the zener diode in parallel ensures that it only conducts when necessary, while allowing the load to operate normally under normal voltage conditions.

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45. (011) The circuit in the bipolar transistor that carries 5 percent of the current flow is the

Explanation

The control circuit in a bipolar transistor is responsible for regulating the flow of current between the emitter and collector. It acts as a switch, allowing or blocking the flow of current based on the input signal at the base. This circuit plays a crucial role in controlling the amplification and operation of the transistor. The emitter-collector circuit, on the other hand, is the main current-carrying path, while the base circuit provides the input signal. The load circuit is the external circuit connected to the transistor for utilizing its output.

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46. (021) Refer to foldout 2. While operating a B809A generator, what switch is closed to provide potential to the exciter field

Explanation

When operating a B809A generator, the switch that needs to be closed in order to provide potential to the exciter field is the S5, run/idle toggle switch. This switch is responsible for controlling the generator's operation mode, toggling between the run and idle states. By closing this switch, the necessary potential is supplied to the exciter field, allowing the generator to function properly.

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

Explanation

The probable cause of the trouble is that TR1 is defective. This is because TR1 is a component that is responsible for the operation of the DC voltmeter. If TR1 is defective, it can prevent the voltmeter from indicating properly. Therefore, the failure of the voltmeter to indicate during operation can be attributed to the defectiveness of TR1.

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

Explanation

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

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49. (006) What are the minority carriers in P-type material?

Explanation

In P-type material, the majority carriers are holes, which are positively charged. Minority carriers, on the other hand, are the minority type of charge carriers present in the material. In P-type material, the minority carriers are electrons, which are negatively charged. These electrons are generated due to thermal excitation or impurity doping, and they can move through the material, but their concentration is much lower compared to the majority carriers (holes).

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50. (001) The force required to move free electrons through a conductor is known as

Explanation

Voltage is the force or potential difference that drives the flow of electrons through a conductor. It is the measure of the energy per unit charge required to move the electrons. Current, on the other hand, refers to the actual flow of electrons. Negative charge and electrostatic force are not accurate terms to describe the force required to move electrons through a conductor.

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51. (004) 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 flows through 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 a different voltage level. The secondary winding is typically designed to have a different number of turns than the primary winding, allowing for voltage transformation.

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52. (013) The emitter in a unijunction transistor (UJT) always points toward the

Explanation

In a unijunction transistor (UJT), the emitter always points toward the base 1 lead. This is because the base 1 lead is the primary input terminal for the UJT, and the emitter is connected to the base 1 lead through a resistor. The emitter is responsible for controlling the current flow between the two base terminals, and its orientation towards the base 1 lead facilitates this control. The collector, on the other hand, is connected to the external circuit and is not directly involved in controlling the UJT's operation.

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53. (013) What controls the firing time of the unijunction transistor (UJT)?

Explanation

The firing time of a unijunction transistor (UJT) is controlled by the resistance and capacitance in the circuit. The resistance determines the charging time of the capacitor, while the capacitance determines the rate at which the capacitor charges. By adjusting these values, the firing time of the UJT can be controlled.

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54. (003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?

Explanation

In an inductive circuit, the current lags voltage by 90 degrees means that the current reaches its maximum value when the voltage is zero, and the voltage reaches its maximum value when the current is zero. 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.

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55. (005) In what type of circuit(s) does a capacitor oppose any change in voltage?

Explanation

A capacitor opposes any change in voltage in an AC circuit because it can store and release electrical energy in response to the alternating current. In an AC circuit, the voltage constantly changes direction and magnitude, and the capacitor resists these changes by storing energy when the voltage is increasing and releasing energy when the voltage is decreasing. This behavior allows the capacitor to oppose any sudden changes in voltage and stabilize the circuit. In contrast, in a DC circuit, the voltage remains constant, so a capacitor does not oppose any change in voltage.

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56. (007) If a negative potential is connected to the cathode and a positive potential is connected to the 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, it creates a forward bias. In this configuration, the positive potential at the anode repels the majority charge carriers in the P-region towards the junction, while the negative potential at the cathode repels the majority charge carriers in the N-region towards the junction. This reduces the width of the depletion region and allows current to flow through the diode. Hence, the diode is forward biased.

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

Explanation

The oil pressure sequencing switch is a component of the A/M32A-60A gas turbine engine lubrication system that is responsible for preventing engine operation if the oil pressure is too low. This switch is designed to ensure that the engine is not started or operated without sufficient oil pressure, which is essential for proper lubrication and protection of the engine components. By monitoring the oil pressure, the sequencing switch can detect if the pressure falls below the required level and activate a safety mechanism to prevent engine operation until the pressure is restored to a safe level.

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

Explanation

If the emitter-base (E-B) current is increased in a transistor amplifier, it will cause the current to increase through the emitter-collector (E-C) circuit. This is because the E-B current controls the amount of current flowing through the E-C circuit. By increasing the E-B current, more current is allowed to flow through the E-C circuit, resulting in an increase in current through that circuit.

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

Explanation

In a series-parallel circuit, the total resistance (RT) can be calculated by adding the resistances of the series resistors and the reciprocal of the sum of the reciprocals of the parallel resistors. In this case, the series resistor R1 has a resistance of 7 ohms. The parallel resistors R2 and R3 have a combined resistance of 8 ohms. Therefore, the total resistance is calculated as 7 + (1/(1/8 + 1/8)) = 7 + (1/(1/4)) = 7 + 4 = 11 ohms.

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60. (033) 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

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61. (015) 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 a probable cause of this trouble?

Explanation

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

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62. (001) Atoms having more than four electrons, but less than eight are known as

Explanation

Atoms having more than four electrons, but less than eight are known as insulators. Insulators are materials that do not conduct electricity easily because their electrons are tightly bound to their atoms and do not move freely. This means that they cannot carry an electric current. In contrast, conductors allow the easy flow of electrons and can carry electricity. Stable atoms refer to atoms that have a full outer electron shell, while semiconductors are materials that have properties in between those of conductors and insulators.

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63. (015) Refer to foldout 1. You are operating an A/M32A-86D generator set at governed speed, but voltage doesn't build up. What is a probable cause of this trouble?

Explanation

The probable cause of the trouble is that the K23 contacts are open. When the K23 contacts are open, it means that the exciter field circuit is not energized. This prevents the generator from building up voltage. The exciter field circuit is responsible for creating the magnetic field that induces voltage in the generator. If the K23 contacts are open, the exciter field circuit remains de-energized and voltage cannot be built up.

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64. (030) 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 or nonexistent, it can cause the ignition control unit to fail. Therefore, checking the oil pressure switch is necessary to ensure that the engine has proper oil pressure and that the ignition control unit can function properly.

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65. (002) In a series-parallel circuit, total voltage is 12 volts, the value of E1 in the series portions of the circuit is unknown. There are two parallel branches (E2 = 3 volts) and the value of E3 in the second parallel branch is unknown. Using Ohm's law, find the value of E1 and E3.

Explanation

In a series-parallel circuit, the total voltage across the circuit is equal to the sum of the voltages across each component. Given that the total voltage is 12 volts and E2 is 3 volts, the remaining voltage (12 - 3 = 9 volts) must be divided between E1 and E3. Since E1 is in the series portion of the circuit, it must have the same voltage as the total voltage (9 volts). Therefore, E1 = 9 volts. E3, being in the parallel branch with E2, must have the same voltage as E2 (3 volts). Therefore, E3 = 3 volts.

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66. (011) The most positive point in a PNP bipolar transistor is the

Explanation

The most positive point in a PNP bipolar transistor is the emitter. In a PNP transistor, the emitter is doped with a higher concentration of positive charge carriers (holes) compared to the base and collector regions. This creates a forward bias between the emitter and base junction, allowing current to flow from the emitter to the base. The emitter is responsible for injecting majority charge carriers into the base region, which then controls the transistor's overall operation. Therefore, the emitter is considered the most positive point in a PNP bipolar transistor.

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67. (028) Refer to foldout 5. During operation of the A/M32A-60A, you close S3 but the alternating 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 opened. This means that there is a break in the circuit, preventing the AC contactor light from coming on.

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68. (027) Refer to foldout 5. The A/M32A-60A 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 set shutting down as soon as S7 is released is that K18 is de-energizing. This means that the circuit or component controlled by K18 is losing power or being switched off, causing the generator set to stop running.

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69. (007) A junction diode has how many PN junctions(s)?

Explanation

A junction diode has only one PN junction. This junction is formed by the combination of a P-type semiconductor and an N-type semiconductor. The P-type region has an excess of positively charged holes, while the N-type region has an excess of negatively charged electrons. The junction between the two regions forms a depletion region, which acts as a barrier to the flow of current in one direction. Therefore, a junction diode has only one PN junction.

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

Explanation

The silicon-controlled rectifier (SCR) is a four-layer semiconductor device. It consists of three PN junctions and four layers of alternating P and N-type material. The four layers are represented by P-N-P-N configuration, with the middle N-type layer acting as the gate. This structure allows the SCR to control the flow of electric current by using a small gate current to trigger a large current flow through the device.

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71. (027) Refer to foldout 5. During your operational check of the A/M32A-60A generator set, the unit runs up to 80 percent and the ready to load light comes on. What do you check?

Explanation

The correct answer is to check if the 95 percent centrifugal switch (S14) is closed. This is because when the unit runs up to 80 percent and the ready to load light comes on, it indicates that the generator set is operating normally. However, the 95 percent centrifugal switch (S14) being closed is a crucial factor in ensuring that the generator is ready to load. If the switch is open, it means that the generator is not ready to supply power and further troubleshooting or repairs may be required.

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72. (028) Refer to foldout 5. During operation of an A/M32A-60A, what happens if K25 is energized?

Explanation

If K25 is energized during the operation of an A/M32A-60A, it means that its contacts are closed. This does not have any effect on the unit's operation and it continues to operate normally.

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73. (014) What component of the voltage regulator compensates for losses in the power cable by sensing changes 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 voltage output to ensure that the desired voltage is maintained despite any losses in the power cable. This helps to regulate the voltage and prevent fluctuations that could potentially damage electrical equipment.

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74. (015) Refer to foldout 1. During an operational check of the A/M32A-86D generator set, the shutdown solenoid energizes immediately after the engine run indicator illuminates. What is a probable cause of this trouble?

Explanation

The shutdown solenoid energizing immediately after the engine run indicator illuminates indicates a probable cause of S49 being shorted. A shorted S49 would cause the shutdown solenoid to receive power as soon as the engine run indicator is activated, leading to the immediate energization of the solenoid.

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75. (32) Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the A/M24T-8 load bank isn't working. What is the probable cause of this trouble?

Explanation

The probable cause of the trouble with the B phase on the A/M24T-8 load bank not working is S56. However, without further information about what S56 refers to, it is not possible to provide a more specific explanation.

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76. (021) Refer to foldout 2. During high voltage operation of the B809A generator set, what action occurs to prevent the direct current (DC) contactors from closing?

Explanation

During high voltage operation of the B809A generator set, the high sense relay (HSR) de-energizes to prevent the direct current (DC) contactors from closing. This means that the HSR stops supplying power to the contactors, which prevents them from closing.

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77. (032) Refer to foldouts 6 and 7. If CB2 opens on an A/M24T-8 load bank, what effect does it have on load bank operation?

Explanation

If CB2 opens on an A/M24T-8 load bank, it will cause the alternating current (AC) load selection switches (S15 through S20) to not work. The opening of CB2 interrupts the circuit and prevents the flow of electricity to the load bank, rendering the AC load selection switches ineffective.

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78. (016) 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." During the operational check, you place S5 in the closed position and the contactor light illuminates. When you release the switch, the contactor opens. What is a probable cause of this trouble?

Explanation

The probable cause of the trouble is that R46 is open. This is indicated by the fact that when S5 is placed in the closed position, the contactor light illuminates. However, when the switch is released, the contactor opens, suggesting that there is an issue with the circuit. As R46 is responsible for controlling the flow of current in the circuit, if it is open (not allowing current to pass through), it would explain why the contactor opens when the switch is released.

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79. (017) What  effect does a defective K4 relay have on the A/M32A-86D generator output circuit?

Explanation

When the K4 relay is defective, it causes the K607 relay to energize and the K1 relay to de-energize.

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80. (032) Refer to foldout 6. After you connect an A/M32A-60A to the A/M24T-8 load bank, you notice one of the blower motors isn't working on 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 that K3 is energized.

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81. (027) Refer to foldout 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 but no combustion during operation of the A/M32A-60A is S11. This could indicate a fuel system malfunction or a lack of fuel reaching the combustion chamber.

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82. (015) Refer to foldout 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 voltage 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 controlling the generator set, is not making a connection or is not functioning properly. As a result, when S13 is placed in the GENERATE position, there is no response because the necessary circuit is not being completed.

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83. (005) What statement best describes a capacitive circuit?

Explanation

A capacitive circuit is characterized by the ability of the current to lead the applied voltage by 90 degrees. This means that the current reaches its peak value before the voltage does in the circuit. Capacitors store electrical energy and release it when the voltage changes, causing the current to flow. Due to the storage and release of energy in the capacitor, the current leads the voltage in a capacitive circuit.

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

Explanation

The probable cause of this trouble is that K110 is open. This means that the circuit breaker K110 is not allowing the flow of current to the load selector switches, resulting in nothing happening when the switches are turned on. The fact that the AC voltmeter indicates 120 volts and the panel lights are working suggests that the power source is functioning properly, but the issue lies with the open circuit breaker K110.

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85. (002) 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 given by the formula P = I^2 * R, where P is the power, I is the current, and R is the resistance. In this question, we are given that the power rating is 40 watts and the total current is 2 amps. By rearranging the formula, we can solve for the resistance R = P / I^2. Substituting the given values, we get R = 40 / 2^2 = 40 / 4 = 10 ohms. Therefore, the correct answer is 20 ohms.

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86. (015) Refer to foldout 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, which is a switch or circuit related to the engine, is closed. This means that the switch or circuit is still providing power or completing a connection, causing the engine on light to remain illuminated.

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87. (032) Refer to foldout 6. The alternating current (AC) cable is plugged into the A/M24T-8 load bank input panel and both blower motors 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 CB1 is malfunctioning. The question states that the AC cable is plugged in and the blower motors are turning, indicating that power is reaching the load bank. However, nothing happens when the shock load switches are turned on. This suggests that there is an issue with the circuit breaker CB1, which is responsible for allowing the flow of current to the load bank. If CB1 is malfunctioning, it may not be properly closing the circuit and allowing power to flow, resulting in the lack of response when the switches are turned on.

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88. (033) 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 on the load bank, you would start by checking K2.

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(005) If the size of the plates of a capacitor is increased, how is...
(020) What action occurs when the B809A generator set alternating...
(022) If you have a loss of residual magnetism in the exciter field...
(018) When troubleshooting any electrical system, you can locate a...
(016) What component on an A/M32A-86D generator is used to manually...
(023) What gas turbine engine component is specifically designed to...
(023) During the operation of a A/M32A-60A generator set, you noticed...
(001) If there are eight electrons in the outer most shell of an atom,...
(011) What is the major difference between an NPN transistor and a PNP...
(015) During operation of the A/M32A-86D generator set, what position...
(002) What is the difference between an open and a short?
(001) What is the simplest form of matter?
(002) What are factors that affect the resistance of a material?
(090) What is the primary use of a silicon-controlled rectifier (SCR)?
(003) When voltage is induced into a conductor by a relative motion...
(006) What statement best describes a diode?
(004) What is the basic principle of operation for transformers?
(026) What section of the A/M32A-60A gas turbine engine load control...
(020) What condition is sensed by the direct current (DC) card on the...
(010) In order to turn off a silicone-controlled rectifier (SCR), the...
(002) In a series-parallel circuit, the series current at I1 = 9 amps;...
(014) The portion of the voltage regulator that supplies exciter field...
(016) Refer to foldout 1. Where is the best point to check voltage to...
(001) In an atom, what electrons contain the most energy?
(019) What B809A generator set speed control system component produces...
(007) The area of a semiconductor where P-type material is joined to...
What are the three leads in a unijunction transistor (UJT) called?
(019) What component on the B809A generator set fuel system...
(011) If the arrow in a bipolar transistor is pointing away from the...
(017) While operating an A/M32A-86D at governed speed, you place S13...
(016) An A/M32A-86D is operating and the alternating current (AC)...
(031) Apparent power is measured in
(001) The electrostatic fields around a positive ion move
(009) How is a zener diode connected in a circuit to regulate voltage?
(033) What is the operating voltage of the blower motor and control...
(016) What component controls the strength of the A/M32A-86D generator...
(025) While you are operating the A/M32A-60A generator set, you turn...
(S30) When an A/M32A-60A generator is started, what component...
(018) Which step of troubleshooting is considered the most difficult?
(018) To test the load contactor relay K1, using test probes, in what...
(008) In a circuit using a bridge rectifier, how many diodes are...
(013) A metal oxide varistor (MOV) is made up of how many...
(020) What signal powers the regulator card output pulse sent to the...
(009) How is the zener diode connected in a circuit to protect the...
(011) The circuit in the bipolar transistor that carries 5 percent of...
(021) Refer to foldout 2. While operating a B809A generator, what...
(029) Refer to foldout 5. The direct current (DC) voltmeter on an...
(017) You are driving on the flight line and notice an A/M32A-86D...
(006) What are the minority carriers in P-type material?
(001) The force required to move free electrons through a conductor is...
(004) What transformer winding acts as a conductor and provides the...
(013) The emitter in a unijunction transistor (UJT) always points...
(013) What controls the firing time of the unijunction transistor...
(003) In an inductive circuit, what is meant by current lags voltage...
(005) In what type of circuit(s) does a capacitor oppose any change in...
(007) If a negative potential is connected to the cathode and a...
(024) What component of the A/M32A-60A gas turbine engine lubrication...
(012) What happens if the emitter-base (E-B) current is increased in a...
(002) In a series-parallel circuit, find RT (total resistance) if...
(033) Refer to foldout 6. On an A/M24T-8 load bank, CR2 supplies 28...
(015) Refer to foldout 1. During operation of the A/M32A-86D generator...
(001) Atoms having more than four electrons, but less than eight are...
(015) Refer to foldout 1. You are operating an A/M32A-86D generator...
(030) If the ignition control unit fails to operate on an A/M32A-60A...
(002) In a series-parallel circuit, total voltage is 12 volts, the...
(011) The most positive point in a PNP bipolar transistor is the
(028) Refer to foldout 5. During operation of the A/M32A-60A, you...
(027) Refer to foldout 5. The A/M32A-60A generator set starts, but...
(007) A junction diode has how many PN junctions(s)?
(010) The silicon-controlled rectifier (SCR) has how many layers?
(027) Refer to foldout 5. During your operational check of the...
(028) Refer to foldout 5. During operation of an A/M32A-60A, what...
(014) What component of the voltage regulator compensates for losses...
(015) Refer to foldout 1. During an operational check of the...
(32) Refer to foldout 7. You are testing an alternating current (AC)...
(021) Refer to foldout 2. During high voltage operation of the B809A...
(032) Refer to foldouts 6 and 7. If CB2 opens on an A/M24T-8 load...
(016) Refer to foldout 1. An A/M32A-86D generator set is sent to the...
(017) What  effect does a defective K4 relay have on the...
(032) Refer to foldout 6. After you connect an A/M32A-60A to the...
(027) Refer to foldout 5. During operation of the A/M32A-60A, the...
(015) Refer to foldout 1. During operation of the A/M32A-86D generator...
(005) What statement best describes a capacitive circuit?
(032) Refer to foldouts 6 and 7. The alternating current (AC)...
(002) What is the resistance in a circuit if the power rating is 40...
(015) Refer to foldout 1. After performing an operational check of the...
(032) Refer to foldout 6. The alternating current (AC) cable is...
(033) Refer to foldout 6. You are testing a direct current (DC)...
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