EPA Type 2 Practice Test

Using a very large vacuum pump during evacuation can cause which of the following?

Increase moisture removal rate Create noncondensable gases Cause trapped water to freeze Damage the vacuum pump

Correct Answer:

Cause trapped water to freeze

Explanation:

Rapid, deep evacuation with a very large pump can cool the system quickly as the pressure drops. Any water trapped in crevices or on cool surfaces experiences this cooling and can freeze, forming ice plugs that block passages or cause issues later. That’s why the main concern is trapped water turning to ice during fast pumping. The other possibilities aren’t the primary effect of using a very large vacuum pump: moisture removal isn’t automatically increased by pump size and, by itself, doesn’t create noncondensable gases; and damage to the pump isn’t the direct consequence of simply using a larger pump, though blocked lines or ice buildup can lead to problems.

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