FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Prepare for the FAA AMT Airframe Exam with our flashcards and multiple choice questions. Each question includes hints and explanations. Get exam-ready now!

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A CSD unit drives a generator through the use of?

An electric motor
A variable hydraulic pump and hydraulic motor
A belt system
Direct mechanical link

The correct answer is: A variable hydraulic pump and hydraulic motor

A CSD unit (Constant Speed Drive) is a device used to control the rotational speed of a generator. It works by taking a constant input speed and adjusting it to a desired output speed. Out of the given options, the only one that is specifically designed for this purpose is a variable hydraulic pump and hydraulic motor. Option A, which mentions an electric motor, does not accurately describe what a CSD unit does. Although an electric motor can also be used to drive a generator, it is not specific to a CSD unit and is not the correct answer. Option C, a belt system, is not the best option either as it is more commonly used in larger industrial applications and is not exclusive to CSD units. Option D, a direct mechanical link, would allow for a direct connection between the generator and the driving unit, but this would not allow for constant speed control which is the main function of a CSD unit. Therefore, B is the correct option as it accurately describes the specific and most common way a CSD unit drives a generator.