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Difficulty: HardDirect Fact Retrieval

During magnetic particle inspection of forged marine propulsion shafts, technicians apply fluorescent ferromagnetic particles suspended in a petroleum distillate carrier. The inspection protocol dictates that the circular magnetizing current must reach a continuous density of 800 amperes per inch of shaft diameter. Before applying the wet bath, the surface must be degreased using an isopropyl solvent and dried for a minimum of twelve minutes. If subsurface linear indications exceed 1.5 millimeters in length, the shaft requires demagnetization down to less than 3 gauss before undergoing secondary ultrasonic verification.

According to the passage, which specific preparatory action must be performed prior to applying the wet fluorescent particle suspension to the shaft?

  1. A
    Demagnetizing the shaft assembly to a field strength of less than 3 gauss
  2. B
    Applying a continuous magnetizing current of 800 amperes for exactly twelve minutes
  3. Degreasing the shaft surface with an isopropyl solvent and allowing it to dry for at least twelve minutesAnswer
  4. D
    Conducting secondary ultrasonic verification to detect subsurface indications over 1.5 millimeters

Answer

Degreasing the shaft surface with an isopropyl solvent and allowing it to dry for at least twelve minutes
The text directly states that before applying the wet bath, technicians must degrease the surface with an isopropyl solvent and allow it to dry for a minimum of twelve minutes.

Step-by-Step Solution

1
Locate the specific target trigger in the passage regarding actions required before applying the wet suspension.
Identified the sentence: 'Before applying the wet bath, the surface must be degreased using an isopropyl solvent and dried for a minimum of twelve minutes.'
Direct fact retrieval requires matching the exact condition described in the prompt with its explicit antecedent in the text.
2
Extract the exact factual requirements tied directly to the preparatory step.
The requirements are surface degreasing with isopropyl solvent and a drying duration of at least twelve minutes.
Ensures complete factual precision without blending numbers or post-inspection protocols.
3
Compare candidate options to eliminate verbatim distractors that misattribute conditions or combine unrelated quantities.
Only the choice detailing isopropyl degreasing and twelve-minute drying reflects the explicitly stated preparatory condition.
Eliminates confusion with conditional defect responses (demagnetization and ultrasonic testing).

Key Concept

Direct Fact Retrieval
Estimated Time:1m 15s
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Direct Fact Retrieval

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