New York Auto Damage Appraisal Practice Exam

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What is the main function of the solenoid in starting circuits?

Provide electric supply to headlights

Act as a gate between ignition and starter

The main function of the solenoid in starting circuits is to act as a gate between the ignition system and the starter motor. When the ignition key is turned, the solenoid receives a small amount of current from the battery. This small current activates the solenoid, which then connects the battery directly to the starter motor with a larger current. This allows the starter motor to crank the engine and initiate the combustion process, crucial for starting the vehicle.

The solenoid essentially serves as a relay that allows the ignition system to control a high-current circuit (the starter) without requiring a heavy-duty switch to be operated manually. The solenoid’s role is vital because it ensures that the starter motor receives adequate power only when the ignition is engaged, preventing unnecessary drain on the battery and potential damage to the starter system.

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Regulate the fuel supply

Control the cooling system

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