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Question

Difficulty: EasyDirect Fact Retrieval

During field operations, tactical water purification systems use multimedia sand filters to remove suspended solids prior to chemical disinfection. Field water specialists must backwash the multimedia filter whenever the differential pressure between the inlet and outlet gauges reaches 15 psi. Backwashing flushes trapped silt and organic sediment out through the drain line, restoring normal flow rates to the downstream microfilters. Performing this procedure prevents premature clogging of the secondary filtration cartridges and ensures consistent drinking water delivery.

According to the passage, at what point must specialists backwash the multimedia filter?

  1. A
    When the differential pressure between the gauges reaches 50 psi
  2. When the differential pressure between the gauges reaches 15 psiAnswer
  3. C
    After the secondary filtration cartridges become clogged
  4. D
    Immediately prior to performing chemical disinfection on intake water

Answer

When the differential pressure between the gauges reaches 15 psi
The passage explicitly states that field water specialists must backwash the multimedia filter whenever the differential pressure between the inlet and outlet gauges reaches 15 psi.

Step-by-Step Solution

1
Scan the passage for the specific trigger condition requiring a multimedia filter backwash.
Located the sentence stating that specialists must backwash the multimedia filter whenever the differential pressure reaches 15 psi.
Direct fact retrieval requires pinpointing the explicitly stated threshold in the text.
2
Compare the retrieved factual detail against the provided answer choices.
Identified the option stating that backwashing occurs when differential pressure reaches 15 psi as the exact match.
Verifies that the selected choice matches the explicit factual statement without inference.

Key Concept

Direct Fact Retrieval
Estimated Time:45s
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Topics

Direct Fact Retrieval

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