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Difficulty: MediumParaphrased Fact Recognition

In heavy equipment hydraulic systems, oil coolers incorporate a thermal bypass valve to maintain optimal fluid viscosity during startup. When fluid temperature drops below operating limits, the bypass valve opens, routing the cold, thickened lubricant directly back to the reservoir without passing through the heat exchanger core. Once normal operation warms the oil, the valve gradually shuts, forcing the heated fluid across the cooling fins to protect internal elastomer seals from heat-induced deterioration.

According to the passage, what occurs when hydraulic fluid temperature is beneath the operational threshold?

  1. A
    The thermal bypass valve shuts completely to elevate fluid viscosity.
  2. Thickened lubricant circumvents the cooling core and returns directly to the storage tank.Answer
  3. C
    Heated fluid is forced across the cooling fins to protect internal elastomer seals.
  4. D
    Auxiliary pressure relief valves engage to prevent physical rupture of hydraulic lines.

Answer

Thickened lubricant circumvents the cooling core and returns directly to the storage tank.
The passage explicitly states that when temperatures drop below operating limits, the bypass valve directs cold lubricant straight to the reservoir without going through the heat exchanger. The correct answer accurately paraphrases this by noting that thickened lubricant circumvents the cooling unit and returns to the storage tank.

Step-by-Step Solution

1
Locate the targeted condition in the passage
Identified the sentence beginning with 'When fluid temperature drops below operating limits...'
The question asks specifically for the event occurring beneath the operational temperature threshold.
2
Analyze the stated factual action
The text states that the valve opens and routes 'the cold, thickened lubricant directly back to the reservoir without passing through the heat exchanger core.'
Understanding the core factual mechanism allows matching it against paraphrased statements.
3
Map textual components to synonymous expressions
'Without passing through the heat exchanger core' corresponds to 'circumvents the cooling core', and 'back to the reservoir' corresponds to 'returns directly to the storage tank.'
Paraphrased fact questions assess recognizing identical meaning through syntactic restructuring and synonyms.

Key Concept

Paraphrased Fact Recognition
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Paraphrased Fact Recognition

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