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

question 214

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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