ACT1

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Brigham Young University, Idaho *

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Electrical Engineering

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Jan 9, 2024

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When testing a charging system using a carbon-pile load tester to measure its maximum output current, the engine rpm should be raised and the load on the charging system should be increased until: When testing a charging system using a carbon-pile load tester to measure its maximum output current, the engine rpm should be raised and the load on the charging system should be increased until: The battery voltage is at 12.6 volts The engine begins to run poorly or die The battery voltage is at 9.6 volts The current reaches the level specified by the manufacturer ChatGPT ChatGPT When testing a charging system using a carbon-pile load tester to measure its maximum output current, the engine rpm should be raised, and the load on the charging system should be increased until the battery voltage is at 9.6 volts . This is a common testing procedure to ensure that the charging system can handle a heavy load while maintaining a sufficient voltage level. If the battery voltage drops to 9.6 volts or below under the increased load, it indicates that the charging system may have difficulty supplying the required current, and further investigation or repairs may be needed. You The voltage regulator controls charging system voltage by directly controlling The voltage regulator controls charging system voltage by directly controlling Stator output Rotor "field" current The rectifier Battery voltage ChatGPT ChatGPT The voltage regulator controls charging system voltage by directly controlling Rotor "field" current . The rotor field current determines the strength of the magnetic field in the alternator, which, in turn, affects the output voltage. The voltage regulator adjusts the rotor field current to regulate the alternator's output voltage and maintain it within the desired range. This ensures that the charging system provides a consistent and appropriate voltage level to charge the battery and power the vehicle's electrical systems. You Duty cycle is a measurement of: Duty cycle is a measurement of: The amount of time (in seconds) that the circuit is turned on The percentage of time that the circuit is turned on The number of times per minute that the circuit is turned on The number of times per second that the circuit is turned on ChatGPT ChatGPT Duty cycle is a measurement of the percentage of time that the circuit is turned on within a specific time period. It is often expressed as a percentage and represents the ratio of time the circuit is active (on) compared to the total time of one cycle. For example, if a circuit is on for half of the total cycle time, the duty cycle would be 50%. You Technician A says that it is okay to install a new alternator into a car with a dead battery, and then use the charging system to charge the battery. Technician B says that if an under-performing charging system isn’t immediately repaired, the battery may be

permanently damaged. Who is correct? Technician A says that it is okay to install a new alternator into a car with a dead battery, and then use the charging system to charge the battery. Technician B says that if an under-performing charging system isn’t immediately repaired, the battery may be permanently damaged. Who is correct? Technician A Technician B Both A and B Neither A nor B ChatGPT ChatGPT Technician B is correct. When dealing with a dead battery, it is generally not advisable to rely solely on the charging system to recharge it, especially if the charging system is under-performing. If the charging system is not functioning properly, it may not provide sufficient charging current to fully recharge the battery, leading to an ongoing problem. Technician A's suggestion of installing a new alternator into a car with a dead battery and relying on the charging system to charge the battery might work in some cases, but it's essential to ensure that the charging system is in good condition. If the charging system is faulty, it won't effectively charge the battery, and the battery may remain in a depleted state. Therefore, the more cautious approach is to address any charging system issues promptly to prevent potential permanent damage to the battery, making Technician B the correct one in this scenario. You Using a lab scope, what should the output signal of a properly working alternator look like? Using a lab scope, what should the output signal of a properly working alternator look like? A straight line A sine wave (alternating between positive and negative) Repatative spikes, followed by a straight line A light, constant ripple ChatGPT ChatGPT The output signal of a properly working alternator, when viewed on a lab scope, should typically look like a sine wave alternating between positive and negative . The alternator generates an alternating current (AC), and this sinusoidal waveform represents the changing voltage produced as the rotor spins within the stator windings. The presence of a smooth and consistent sine wave indicates that the alternator is functioning correctly and producing a stable AC output. Irregularities or distortions in the waveform could suggest potential issues with the alternator or associated components. You Technician A says that the brushes in an alternator ride on a commutator. Technician B says that the brushes in a starter motor ride on slip rings. Who is correct? Technician A says that the brushes in an alternator ride on a commutator. Technician B says that the brushes in a starter motor ride on slip rings. Who is correct? Technician A Technician B Both A and B Neither A nor B ChatGPT ChatGPT Neither Technician A nor Technician B is correct.

In an alternator, the brushes do not ride on a commutator. Instead, alternators use slip rings. The slip rings provide a continuous connection to the rotor winding, allowing the output to be a smooth, continuous AC voltage. In a starter motor, the brushes do ride on a commutator. The commutator is a rotary switch that reverses the current direction in the motor windings, allowing the motor to turn in one direction. So, the correct configuration is that brushes in an alternator ride on slip rings, and brushes in a starter motor ride on a commutator. You Two technicians are discussing testing an alternator’s maximum output capacity. Technician A says that this test is performed with the engine idling. Technician B says that a load must be applied to the vehicle’s charging system in order to perform this test. Who is correct? Two technicians are discussing testing an alternator’s maximum output capacity. Technician A says that this test is performed with the engine idling. Technician B says that a load must be applied to the vehicle’s charging system in order to perform this test. Who is correct? Technician A Technician B Both A and B Neither A nor B ChatGPT ChatGPT Technician B is correct. When testing an alternator's maximum output capacity, a load must be applied to the vehicle's charging system to simulate real-world conditions. This is typically done using a carbon-pile load tester or other methods that put a load on the alternator. Technician A is not correct in stating that this test is performed with the engine idling. The test for maximum output capacity is usually done with the engine running at higher RPMs to ensure that the alternator is capable of producing its maximum current under increased load conditions. So, the correct answer is Technician B . You What is a “full-field” test? What is a “full-field” test? Disconnecting the battery while the car is running to see if the generator can supply enough electricity by itself Grounding the generator's output wire to draw maximum current from the generator Providing full battery voltage (100% duty cycle) to the rotor to see if output voltage increasres Performing a load test on the generator while the engine speed is above 2000 rpm ChatGPT ChatGPT A "full-field" test involves providing full battery voltage (100% duty cycle) to the rotor of an alternator to see if the output voltage increases. This test is used to determine whether the alternator is capable of producing its maximum output. By bypassing the voltage regulator and supplying full field current to the rotor, the alternator operates at its maximum capacity, allowing technicians to assess its performance under heavy load conditions. It's a diagnostic test often used to troubleshoot charging system issues and identify problems with the alternator or t

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