Examkin

Question

Difficulty: EasyDirect Fact Retrieval

During seasonal overhaul of tactical mobile refrigeration units, technicians must inspect the thermal expansion valve before recharging the system. When clearing particulate buildup from the internal strainer screen, maintenance personnel are required to use dry nitrogen gas at low pressure. Solvents and liquid flushes must never be applied to the expansion valve housing, as residual chemical moisture will freeze and block the metering orifice during cold-cycle operation. Once the strainer is cleared, the brass sealing cap must be hand-tightened before applying torque with a calibrated wrench.

According to the passage, what should technicians use to clear particulate buildup from the internal strainer screen?

  1. A
    Liquid chemical flushes
  2. Dry nitrogen gas at low pressureAnswer
  3. C
    Liquid refrigerant
  4. D
    A calibrated torque wrench

Answer

Dry nitrogen gas at low pressure
The passage explicitly states that when clearing particulate buildup from the internal strainer screen, maintenance personnel are required to use dry nitrogen gas at low pressure.

Step-by-Step Solution

1
Scan the passage for keywords related to the task in the prompt: 'clearing particulate buildup' and 'strainer screen'.
Located the second sentence: 'When clearing particulate buildup from the internal strainer screen, maintenance personnel are required to use dry nitrogen gas at low pressure.'
Direct fact retrieval requires matching key terms from the question directly to the corresponding statement in the text.
2
Identify the required material specified for this cleaning procedure.
The text directly names 'dry nitrogen gas at low pressure'.
The correct answer must strictly reflect the explicitly stated fact without alteration or outside assumption.

Key Concept

Direct Fact Retrieval
Estimated Time:45s
Rate this question

Topics

Direct Fact Retrieval

More questions from this topic