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問題 #47
Which of the following is listed as a typical transformer inspection point in the guide?
答案：C
問題 #48
According to API 541, the combined runout for areas on the shaft that are to be observed by radial vibration probes shall not exceed:
答案：A
解題說明：
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.
問題 #49
Positive-pressurization and purging are based on the principle that an enclosure or room located in a classified location can:
答案：B
解題說明：
The correct answer isC. In hazardous or classified locations, positive pressurization and purging protect electrical equipment by preventing the surrounding flammable atmosphere from entering the enclosure. The operating principle is that the enclosure, cabinet, or room is supplied withclean air or an inert gasat a pressure and flow rate high enough to keep hazardous gas or vapor out before and during equipment operation. This allows equipment that might otherwise not be suitable for direct exposure to a classified atmosphere to operate safely when the purge and pressure conditions are maintained.
From an API source-inspection perspective, this aligns with the guide's emphasis on verifying compliance with thespecified protection method, nameplate data, project drawings, and applicable hazardous-area requirements during inspection and surveillance. The inspector's concern is not simply whether the enclosure exists, but whether the correct protective concept has been applied and supported by proper fabrication, testing, and documentation. Options A and B describe the hazardous atmosphere itself, not the protection principle. Option D is incorrect because normal arcing devices still require a suitable protection method; pressurization does not rely on relays arcing normally.
問題 #50
What is the purpose of an equipment risk assessment in the source inspection process?
答案：B
解題說明：
The correct answer isB. In the API source inspection process, anequipment risk assessmentis used to determinehow much source inspection and surveillance effort is neededfor a particular item during themanufacture and fabrication phaseat the supplier or vendor facility. The assessment helps establish the inspection strategy by identifying the degree of surveillance, the need for hold or witness points, the frequency of shop visits, and whether increased oversight such as resident inspection may be justified. In other words, the risk assessment is a planning tool that aligns inspection effort with the potential impact of failure, nonconformance, schedule delay, or critical service requirements.
OptionAis too narrow because the assessment is not limited to failure of the vendor's quality system.
OptionCrelates more to supplier qualification or procurement selection, not source inspection planning.
OptionDis unrelated to the technical purpose of inspection risk assessment.
From an API perspective, the practical value of the equipment risk assessment is that it ensures inspection resources are applied where they are most needed so that critical equipment receives the proper level of surveillance and verification before release.
問題 #51
Deviations from specifications must be approved by the:
答案：A
解題說明：
The correct answer isDbecause anydeviation from the approved specification, code requirement, purchase document, or design basismust be formally accepted by theresponsible engineer, not simply by manufacturing, quality, or inspection personnel. In source inspection practice, the manufacturer's engineer may identify or propose a deviation, and the vendor's quality manager may document it within the nonconformance system, but neither of them has final authority to approve a change that affects design intent, technical compliance, or purchaser requirements. The inspection coordinator also manages logistics and communication, but is not the technical approval authority.
This is a fundamental principle in API-aligned source inspection and surveillance. The source inspector verifies conformance to the approved drawings, specifications, and referenced standards. When a deviation is found, it must be handled through the formal deviation or concession process and resolved by the party with technical design responsibility. That is why theresponsible engineeris the correct approving authority. This preserves engineering accountability, maintains traceability, and ensures that any departure from specification is technically evaluated before acceptance. Therefore,option Dis the verified answer.
問題 #52
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