Engine Vacuum, Atmospheric Pressure and Spring Tension All Work on the Vacuum

question 1

Multiple Choice

Engine vacuum, atmospheric pressure and spring tension all work on the vacuum modulator diaphragm. Which of the following statements describes the action of these forces on the diaphragm?

• A) As manifold vacuum increases, it works with atmospheric pressure to stretch the spring, increasing modulator pressure.
• B) As manifold vacuum decreases, the spring extends, increasing modulator pressure.
• C) As atmospheric pressure changes, there is an inversely proportional change in modulator pressure.
• D) As manifold pressure changes there is a directly proportional change in modulator.

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