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Difficulty: HardSequential Detail Extraction

Before operators initiate the thermal cycling phase of a cryogenic distillation column, several preparatory milestones must be achieved. Technicians must first purge the auxiliary piping with dry nitrogen to eliminate residual moisture. Once moisture sensors confirm relative humidity falls below two percent, the primary refrigeration loop is engaged to pre-chill the condenser jacket. However, prior to lowering the condenser temperature below freezing, workers must calibrate the digital pressure transducers, but only after the secondary bypass valve has been manually locked. Following condenser chilling, the feed stock is introduced into the column base.

Based on the passage, which action must technicians complete immediately before calibrating the digital pressure transducers?

  1. A
    Lowering the condenser temperature below freezing
  2. B
    Purging the auxiliary piping with dry nitrogen
  3. Manually locking the secondary bypass valveAnswer
  4. D
    Introducing the feed stock into the column base

Answer

Manually locking the secondary bypass valve is the required action completed immediately before calibrating the digital pressure transducers.
The text states that technicians must calibrate the digital pressure transducers 'only after the secondary bypass valve has been manually locked.' The conditional phrase 'only after' explicitly marks the locking of the secondary bypass valve as the immediate prerequisite step before calibration can take place.

Step-by-Step Solution

1
Locate the sentence addressing digital pressure transducer calibration in the passage.
Identified text: 'However, prior to lowering the condenser temperature below freezing, workers must calibrate the digital pressure transducers, but only after the secondary bypass valve has been manually locked.'
Isolating the relevant statement allows extraction of sequential markers surrounding the target event.
2
Analyze the sequential cue 'only after' governing the target action.
The phrase 'only after the secondary bypass valve has been manually locked' establishes that the locking of the valve must precede the transducer calibration.
Disentangling non-linear transition cues ('prior to' versus 'only after') clarifies the exact order of operations.
3
Confirm the immediate chronological predecessor to the calibration step.
Manually locking the secondary bypass valve is the direct prerequisite step before transducer calibration.
Directly matches the question stem's requirement for the action occurring immediately prior to calibration.

Key Concept

Sequential Detail Extraction in Complex Procedural Text
Estimated Time:1m 15s
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Sequential Detail Extraction

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