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Vacuum-Operated Cruise Control Systems Are Being Discussed

question 67

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Vacuum-operated cruise control systems are being discussed. Technician A says the brake pedal opens a vacuum valve that bleeds off vacuum to the cruise control servo when the brakes are applied. Technician B says a switch on the brake pedal assembly turns off the electrical power to the transducer when the brakes are applied. Who is correct?


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An economic system focused on minimizing resource use and waste production.

Barrel of Oil

A unit of measure for crude oil and other petroleum products, equivalent to 42 US gallons.

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Unanticipated or unforeseen events or changes in the environment that can drastically impact ecosystems and human societies.

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A measure of how acidic or basic a solution is, on a scale of 0 to 14, where 7 is neutral, values less than 7 are acidic, and values greater than 7 are basic.

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