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質問 # 37
According to NEMA ICS 2, a provision for pad locking shall be provided:
正解：B
解説：
The correct answer isB. UnderNEMA ICS 2for motor controllers and combination starters, the required provision forpadlockingis associated with theexternal operating handle. This arrangement allows the disconnecting means or operating mechanism to be secured in the desired position, typically for safety isolation and lockout purposes during maintenance or inspection. It is a functional safety feature tied directly to operation of the controller, not merely to enclosure access.
The other options are not the standard requirement in this context. Padlocking thedoor,wireway, orrear doormay be used in some installations for security or restricted access, but those are not the specific NEMA ICS 2 provisions identified for the controller operating mechanism itself. The standard intent is to ensure that the operating handle can be locked so the equipment cannot be unintentionally operated while personnel are working on or near it.
From an API source inspection perspective, this falls under verification ofMCC construction details, safety features, interlocks, and compliance with applicable referenced standardsduring shop inspection and quality surveillance. Therefore, the correct answer ison the external operating handle, which makesoption Bthe verified answer.
質問 # 38
According to API 541, the combined runout for areas on the shaft that are to be observed by radial vibration probes shall not exceed:
正解：D
解説：
The correct answer isD. In API 541, when a motor shaft is monitored usingradial vibration probes, the probe- observed shaft surface must meet a strictcombined runoutlimit so that the vibration reading reflects actual machine vibration rather than shaft surface irregularity, eccentricity, or electrical and mechanical runout effects. API 541 sets this limit at25% of the allowed unfiltered peak-to-peak vibration amplitude or 6.4 µm
0.25 mils, whichever is greater. This requirement is important because excessive runout can distort probe signals and produce misleading vibration data during shop testing and acceptance.
From a source inspection standpoint, this is a critical verification item during motor testing for large rotating equipment. If the shaft finish and probe track are not within the required runout limit, the vibration measurements cannot be relied on for acceptance decisions. The API guide includeselectric motors over 500 HPas a covered equipment category and emphasizes inspection and surveillance activities tied to applicable standards, testing, and verification of compliance during manufacture. Therefore,option Dis the correct API
541 requirement.
質問 # 39
Which source inspection effort level is MOST appropriate for the highest-risk equipment?
正解：C
質問 # 40
Within the context of NEMA ICS 1, which of the following describes PD 3?
正解：A
解説：
The correct answer isD. In the insulation coordination context used byNEMA ICS 1,PD 3refers to apollution degreewhere conductive contamination or contamination that becomes conductive due to condensation is expected often enough to materially affect insulation performance. This meansmoisture occurs frequently, dust or other deposits canbecome conductive when moist, and the level of pollution is enough to producetracking or erosion at a moderate rate. This classification is more severe than cleaner indoor environments, but not as extreme as the harshest pollution conditions.
From a source inspection standpoint, understanding the pollution degree is important when evaluatingcontrol panels, spacing, creepage requirements, insulating materials, and overall suitability of the equipment for the intended service environment. If the wrong pollution degree is assumed, the panel may have inadequate insulation distances and may be more vulnerable to flashover, tracking, surface deterioration, or premature failure in service.
OptionCbetter reflects a very clean environment. OptionBis more consistent with a less severe contamination condition. OptionAdescribes a harsher situation than PD 3, with continuous moisture and more aggressive deterioration. Therefore,PD 3is best described byD.
質問 # 41
According to NETA, for low voltage cables a visual inspection must verify that:
正解：A
解説：
The correct answer isCbecause the API guide repeatedly emphasizes that source inspection and surveillance of electrical equipment must verify installed wiring and connections against the governing project drawings.
In the guide's inspection activities, items such as"One-line Wiring Diagram Review"and confirmation that components conform to drawings and specifications are specifically identified as part of the inspection checklist. For electrical equipment inspections more broadly, the guide also requires inspectors to compare equipment and circuitry with drawings and verify that electrical details conform to those drawings.
The other options are weaker. The guide discusses low-voltage cable identification and notes that NEC mandates only certain conductor colors for neutral and protective grounding, not a blanket requirement that color codes must comply with IEEE. Also, cable shields are discussed in the context ofMV/HV cable constructionthrough conductor screens and shielding-related design features, not as a universal low-voltage visual inspection criterion. Finally, the guide does not require all terminations to use ring tongue lugs.
Therefore, verifying that cableconnections match the single-line diagramis the best verified answer.
質問 # 42
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