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NEW QUESTION # 86
According to IEEE 841, terminal boxes for voltages above 1000 V or for frame sizes exceeding 449T at 1000 V shall be provided with:
Answer: A
Explanation:
The correct answer isB. Formedium-voltage motor terminal boxes, IEEE 841 requires an added safety provision because these enclosures contain higher-energy terminations and present a more serious shock and arc-flash hazard than standard low-voltage terminal boxes. Apermanent locking mechanismis therefore required for terminal boxes used on motors above1000 V, and also for certain large frame motors at1000 V, to prevent unauthorized or accidental access while the motor is energized. This requirement supports safe operation, maintenance control, and electrical isolation practices.
From an API source-inspection perspective, this falls under verification ofelectrical safety features, enclosure construction, and compliance with the applicable motor standardduring shop inspection and surveillance. The API guide includeselectric motors over 500 HPamong the covered equipment categories and emphasizes checking conformance to applicable codes, referenced standards, drawings, and purchase specifications during manufacture and inspection. A drain fitting may be required on some terminal boxes for moisture control, and grounding provisions are also important, but those are not the specific IEEE 841 requirement identified in this question. The distinctive requirement here is thepermanent locking mechanism.
NEW QUESTION # 87
When might a resident source inspector be required at a shop during manufacture and fabrication?
Answer: A
Explanation:
The correct answer isA. In API source inspection practice, the decision to assign aresident source inspectoris driven primarily by therisk level of the equipment or fabrication activity. When the risk assessment identifies an item ashigh or highest risk, increased surveillance may be necessary because the consequences of defects, missed hold points, schedule slippage, or nonconformance can be significant. A resident inspector provides continuous or frequent monitoring of manufacturing progress, verification of critical stages, review of records, and immediate reporting of issues that could affect quality, cost, or delivery.
Option B is not sufficient by itself. Being sourced from a foreign vendor may affect logistics or planning, but it does not automatically justify a resident inspector. Option C is based on convenience, not inspection need.
Option D may create project pressure, but a busy shop or tight schedule alone is not the primary criterion for resident assignment.
The API approach is risk-based: surveillance intensity, including the possible need for a resident inspector, is determined by thecriticality and risk classificationof the equipment and the potential impact of nonconformance during manufacture.
NEW QUESTION # 88
Laminations in a motor stator core are used to reduce:
Answer: D
Explanation:
The correct answer isC. Stator cores in electric motors are built fromthin laminated steel sheetsrather than one solid mass of metal in order to reducecore losses, especiallyeddy current losses. When alternating magnetic flux passes through a solid iron core, circulating currents are induced within the metal. These currents create unwanted heating and waste energy. By dividing the core into insulated laminations, the path available for these circulating currents is broken up and their magnitude is greatly reduced. This improves motor efficiency, lowers temperature rise, and helps preserve insulation life.
From an API source inspection standpoint, this matters because core construction directly affects the performance and reliability of large motors. Excessive core losses can lead to overheating, degraded efficiency, and premature insulation damage. During manufacturing and inspection, the source inspector may review core fabrication quality, lamination integrity, and test results that indicate proper magnetic and thermal performance. The purpose of laminations is not to reduceAC voltage,frequency, orDC voltage. Their function is to minimizeenergy lossin the magnetic core, makingCthe verified best answer.
NEW QUESTION # 89
What is the purpose of an insulation resistance reading?
Answer: D
Explanation:
The correct answer isC. Aninsulation resistance readingis performed to assess the integrity and condition of the electrical insulation system by measuring the resistance to current leakage between energized conductors and ground, and in many cases between conductors themselves. In practical source inspection and surveillance of electrical equipment, this test helps identify moisture contamination, deteriorated insulation, damage during manufacturing or handling, and possible weaknesses that could lead to tracking, leakage current, or premature failure when the equipment is energized.
From the API source inspection perspective, electrical testing is intended to verify that the equipment has been manufactured, assembled, and prepared in accordance with specifications and that the insulation system is sound prior to shipment or service. The test doesnotmeasure the normal DC resistance of the conductor itself, so option B is incorrect. It also doesnotprimarily verify termination tightness, so option D is incorrect.
Option A is inaccurate because grounding condition is not the main purpose of an insulation resistance test.
The main purpose is to evaluate theinsulation condition between conductors and ground, which makesCthe best answer.
NEW QUESTION # 90
In addition to maximum rated voltage, manufacturer's name, trademark and AWG, which of the following markings is required for all conductors and cables?
Answer: B
NEW QUESTION # 91
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