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問題 #90
What would the equipment pictured below be used for?
答案：D
解題說明：
The correct answer isC. Calibration of precision measuring equipment. The pictured item is agauge block set, also calledJo blocksorslip gauges. These are precision-ground blocks manufactured to extremely accurate dimensions and are primarily used as a reference standard forchecking and calibrating measuring instrumentssuch as micrometers, calipers, dial indicators, height gauges, and other dimensional inspection tools. In manufacturing and fabrication processes, source inspectors must be confident that the instruments used by the supplier are properly calibrated and traceable, because reliable measurement is essential for verifying tolerances, fit-up, machining accuracy, and component acceptability.
OptionBis close, but gauge blocks are generally not the direct tool used to measure the equipment itself during routine production inspection. Instead, they serve as areference standardto confirm the accuracy of the measuring devices that will perform those inspections. OptionAis incorrect because shaft alignment is typically checked using dial indicators, laser alignment tools, or similar methods. OptionDis also incorrect because spacing verification would use other dimensional tools, not this reference block set.
問題 #91
What requirement shall be included in a lockout/tagout procedure?
答案：A
問題 #92
What is the purpose of labeling the temperature range on electrical equipment used in a Class I hazardous area?
答案：B
解題說明：
The correct answer isB. In aClass I hazardous location, flammablegases or vaporsmay be present. The purpose of the equipmenttemperature marking, often expressed through atemperature class or temperature code, is to ensure that under normal operation and specified abnormal conditions the equipment'smaximum surface temperaturewill remainbelow the autoignition temperatureof the hazardous atmosphere present. This prevents the electrical equipment itself from becoming an ignition source.
This is a fundamental hazardous-area protection concept used when inspecting electrical equipment nameplates, certifications, and compliance markings. The inspector must verify that the marked temperature classification is suitable for the gas group and ignition characteristics of the service environment. The marking is not intended simply to match process temperature, compare with other Class I devices, or confirm general high-temperature limits. Instead, it is specifically aboutignition preventionin the presence of flammable vapors.
Within API-aligned source inspection practice, this falls under verification ofequipment markings, nameplates, code compliance, and hazardous-area suitabilityduring manufacturing review and inspection.
Therefore, the temperature range or temperature classification label is used to ensure the equipmentwill not exceed the autoignition temperature of the gas or vapor present, makingoption Bthe verified answer.
問題 #93
What does the second letter of the four-letter cooling code on liquid-immersed transformers identify?
答案：C
解題說明：
The correct answer isB. Forliquid-immersed transformers, the four-letter cooling code is used to describe both thecooling mediaand themethod of circulationfor the internal and external cooling systems. In this code structure, thefirst letteridentifies theinternal cooling mediumthat is in contact with the windings, while thesecond letteridentifieshow that internal cooling medium circulates. This may be by natural circulation or by forced circulation, depending on the transformer design. Thethird letterthen identifies theexternal cooling medium, and thefourth letterindicates thecirculation method of that external medium.
This coding is important in source inspection because the cooling class affects transformer rating, heat dissipation capability, accessories, and verification of nameplate data. During inspection and surveillance, the source inspector checks that the specified cooling class on the nameplate, drawings, and test documentation matches the purchase requirements and transformer design. Misidentifying the cooling code can lead to misunderstanding of the transformer's thermal performance and service suitability. Therefore, thesecond letterspecifically represents thecirculation mechanism for the internal cooling medium.
問題 #94
What standard is used for the installation of signaling and communications conductors, equipment, and raceways?
答案：A
解題說明：
The correct answer isC, NFPA 70. NFPA 70 is theNational Electrical Codeand it is the primary installation standard used for electrical wiring systems, includingsignaling and communications conductors, associated equipment, and raceways. In source inspection and quality surveillance, the inspector must verify that electrical equipment and its installation-related features are consistent with the applicable code requirements identified in the purchase documents and project specifications. For signaling and communications circuits, NFPA 70 provides the governing installation rules for conductor methods, separation, protection, routing, and raceway usage.
The other options do not fit this question.NEMA 250covers enclosure types and environmental protection ratings for electrical equipment enclosures, not installation rules for communications and signaling systems.
IEEE C37.20.2applies to metal-clad switchgear, so it is equipment-specific and not the general installation code for communications conductors.IEC 20047is not the recognized answer in this context.
From an API source inspection perspective, this distinction matters because inspectors must know whether they are checkingequipment construction standardsorfield installation code requirements. For signaling and communications installations, the correct governing standard isNFPA 70.
問題 #95
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