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質問 # 17
According to ANSI C57.12, the average winding temperature rise above ambient temperature shall not exceed what value?
正解：B
解説：
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.
質問 # 18
During switchgear source inspection, which item must be verified to prevent opening a medium-voltage door when the isolation switch handle is in the full ON position?
正解：B
質問 # 19
Which edition of industry codes and standards applies to the equipment being inspected?
正解：C
解説：
The correct answer isD. The edition specified in the engineering design. In API source inspection practice, the inspector does not choose whichever code edition appears newest or most convenient. The applicable requirements are the ones defined by thepurchase order, engineering design documents, project specifications, approved drawings, and referenced codes and standards identified for that job. Source inspection is a verification function, so the inspector must confirm compliance against thecontractual and technical basis of designestablished for the equipment being manufactured.
This is important because different editions of the same standard may contain different rating rules, test requirements, construction details, or acceptance criteria. If an inspector were to apply the latest edition without project authorization, that could create conflict with the approved design basis and lead to incorrect acceptance or rejection. Likewise, the edition found at the point of use or supplied by the inspection agency is not automatically controlling unless it matches the project's specified design basis.
Therefore, for inspection and quality surveillance of electrical equipment, the governing edition is theedition specified in the engineering designand related contract documents.
質問 # 20
NEMA rated motor controllers require a minimum range of conductor sizes for a specific size controller.
Which of the following conductor sizes is appropriate for a Size 2 controller?
正解：B
解説：
The correct answer isD. For aNEMA Size 2 motor controller, the appropriate conductor range is10 AWG to 4 AWG for 60°C rated cableand10 AWG to 6 AWG for 75°C rated cable. This matches the common NEMA controller terminal wire range used for Size 2 starters and controllers in industrial motor control applications.
In practical source inspection and shop verification, this matters because the inspector must confirm that the controller terminals are suitable for the intended field wiring and that the manufacturer's assembly, labels, and terminal data are consistent with the governing standard and purchase specification.
The API Guide for Source Inspection and Quality Surveillance of Electrical Equipment includesMotor Control Centersamong the major covered equipment categories for source inspection. The guide also makes clear that its focus is onsource inspection and quality surveillance activities, meaning verification of compliance with drawings, specifications, nameplates, and applicable referenced standards during manufacture and inspection. Since MCC buckets and NEMA motor controllers rely on proper terminal and conductor compatibility,option Dis the correct NEMA-aligned answer.
質問 # 21
A source inspector reviewing a control panel should verify wiring against which project document as a core inspection activity?
正解：A
質問 # 22
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