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問題 #108
Circuit breakers over 1000 V equipped with stored energy mechanisms shall perform which of the following functions?
答案：B
解題說明：
The correct answer isD. Formedium-voltage circuit breakers over 1000 Vthat use astored-energy operating mechanism, a key safety and functional requirement is that the mechanism mustnot release the stored energy until it has been fully charged. This prevents incomplete closing or tripping operations, avoids unreliable breaker performance, and reduces the risk of mechanical damage or unsafe operating conditions. In other words, the breaker mechanism must include an interlock or control feature that blocks release of the spring or stored-energy system unless the charging cycle has been properly completed.
The other options do not express the required stored-energy mechanism function. Indicating control power availability may be useful, but it is not the defining requirement of the stored-energy mechanism itself.
Detecting fault current is the job of protective relays and sensing devices, not the charging mechanism.
Locating the position of the charging mechanism is not a required protective function. In API-aligned source inspection ofswitchgear, the inspector verifies mechanism operation, interlocks, test records, and compliance with the applicable standards and project specifications. Therefore, the required function is toprevent release of stored energy unless the mechanism is fully charged, makingoption Dthe verified answer.
問題 #109
The insulation requirement referred to in NEMA ICS 1 defines clearance as the shortest distance:
答案：C
解題說明：
The correct answer isC. InNEMA ICS 1, the termclearancerefers to theshortest distance through air between two conductive parts. This is an important insulation concept used in industrial control and electrical equipment because adequate air spacing helps prevent dielectric breakdown, flashover, and unintended arcing when equipment operates at its rated voltage. During source inspection, this matters when verifying control panels, terminals, bus arrangements, relays, and other energized components where spacing must conform to design standards and applicable codes.
OptionBdescribes a different concept known ascreepage distance, which is the shortest pathalong the surface of an insulating materialbetween conductive parts. Clearance and creepage are related but not the same, and inspectors must understand that distinction when reviewing equipment construction. OptionAis not the NEMA definition of clearance, and optionDrefers more to personnel approach boundaries or electrical safety concepts, not insulation spacing requirements.
For API source inspection of control panels and similar assemblies, verifying properair clearancesis essential to confirming safe construction and compliance with specified electrical standards.
問題 #110
Final inspection and shipping preparations of switchgear typically consists of verifying all of the following except:
答案：A
解題說明：
The correct answer isAbecause final inspection and shipping preparation forswitchgearnormally focuses on the equipment'sphysical readiness for release, not on closing every remaining manufacturing or drawing- administration issue in a broad project sense. At this stage, the source inspector typically verifies that the assembled lineup is complete, thatunit and master nameplates are correctly engraved, that preservation andpackaging requirementshave been visually checked, and that the manufacturer'sQC checkout or final release checklisthas been properly completed and signed. These are direct shipment-readiness verification points.
By contrast, "all final manufacturing and drawing issues are closed" is broader and more administrative.
Some drawing comments, document revisions, or non-shipment-related internal matters may still be processed separately through document control without preventing the practical completion of shipping inspection, as long as the equipment itself is acceptable for release and traceable records support that release. The API guide treatsswitchgearas a covered equipment category and emphasizessource inspection and quality surveillance activitiessuch as verifying conformance to specifications, records, markings, and inspection status rather than acting as the project's full document-closeout authority.
問題 #111
According to ANSI C57.12, the average winding temperature rise above ambient temperature shall not exceed what value?
答案：A
解題說明：
The correct answer isA. UnderANSI C57.12transformer requirements, theaverage winding temperature rise above ambientis commonly limited to65°Cfor standard transformer designs. This limit is important because transformer insulation life is strongly affected by operating temperature. If the winding temperature rise exceeds the permitted value, insulation aging accelerates, reducing transformer reliability and service life.
That is why temperature-rise testing is a key verification item during transformer manufacture and factory acceptance activities.
From a source inspection perspective, the inspector should verify that the transformer has been tested in accordance with the applicable standard, that the measured temperature-rise values are properly recorded, and that the results comply with the specified acceptance criteria. The average winding temperature rise is not the same as hotspot temperature, and it must be evaluated against the standard test method and rating basis. The other options are too high for the standard average winding rise value typically associated with ANSI C57.12.
In API-aligned source inspection and quality surveillance oftransformers, confirming compliance of factory test results such as temperature-rise performance is an essential part of final acceptance. Therefore,65°Cis the verified answer.
問題 #112
A source inspector reviewing a control panel should verify wiring against which project document as a core inspection activity?
答案：A
問題 #113
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