The correct answer isD. In rotating electrical equipment,non-contacting probesnormally refer toproximity probesthat are mounted in or at thebearing housingsto monitorshaft relative vibration. These probes do not touch the shaft; instead, they sense shaft motion relative to the bearing housing. In practice, radial vibration is usually monitored in thehorizontal and vertical directions, and where applicable axial movement is also monitored using an axial probe arrangement. That makes option D the only technically correct choice.

The other options are not consistent with standard vibration measurement practice. Measurements taken on thebaseplateorframeare generally made with contact sensors such as accelerometers or velocity pickups, not non-contacting probes. Option B is incorrect because vibration is not defined as being measured “on the shaft at 1.2 times the running speed” as a standard probe location criterion. The API guide includeselectric motors over 500 HPamong its covered equipment categories and emphasizessource inspection and quality surveillance activitiestied to applicable standards, testing, and verification during manufacture.

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.

The correct answer isCbecauseapparent powerin an AC electrical system is measured involt-amperes VA. Apparent power represents the total electrical power supplied to a circuit and is the combination ofreal powerandreactive power. Real power, which performs useful work such as turning a motor shaft or producing heat, is measured inwatts. Reactive power, which supports magnetic and electric fields in inductive or capacitive equipment, is measured invars. Apparent power is therefore the vector sum of these two and is expressed inVAor larger units such askVAandMVA.

The other options are incorrect for this reason.Mhosis a unit of conductance, not power.Varsmeasure reactive power only.Wattsmeasure true or active power only. In source inspection and quality surveillance of electrical equipment, understanding these distinctions is important when reviewing motor data sheets, transformer ratings, switchgear load data, and electrical test reports. Equipment such as transformers and generators are commonly rated inkVA or MVAbecause their thermal and current-carrying capability is tied toapparent power, makingvolt-amperesthe correct answer.

The correct answer isC. NFPA 70 requires thatmetal raceways and metal enclosures be metallically joined together into a continuous electrical conductor. This requirement is fundamental because threaded conduit systems are not only mechanical connections, but also part of theequipment grounding and bonding path. Applying Teflon tape or similar nonconductive thread sealant to conduit threads can interfere with electrical continuity across the joint, which defeats the code intent for bonding and grounding.

From an API source inspection and quality surveillance perspective, the inspector must verify that conduit systems, fittings, and enclosures are assembled in a way that preserves electrical integrity, especially where grounding continuity is critical for personnel safety, fault-current return, and hazardous-location protection methods. The use of Teflon tape is therefore not accepted as a general practice on threaded conduit connections because it can compromise the metallic path. Option A is incorrect because the rule is not limited to Class I, Division 2. Option B is incorrect because water exclusion does not override bonding requirements. Option D is also incorrect because Teflon tape does not create an approved explosion-proof vapor seal.

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.

The correct answer isD. API RP 14FZ. This document is specifically intended for thedesign and installation of electrical systems on fixed and floating offshore petroleum facilitieswhere equipment may be located inunclassified areas and hazardous classified areas identified as Class I, Zone 0, Zone 1, and Zone 2. The key clue in the question is the use of theZoneclassification system. In API and offshore electrical practice,API RP 14FZaddresses the offshore application of the zone-based hazardous area approach.

By contrast,API RP 14Fis associated with offshore electrical system guidance using the olderdivision-basedclassification approach rather than the zone terminology.NFPA 70is the National Electrical Code and is broader in scope; it is not the specific offshore petroleum recommended practice asked here.IEEE 841relates to severe-duty squirrel-cage induction motors and does not cover complete offshore electrical system design and installation requirements.

For source inspectors, recognizing the correct governing document is important because inspection and surveillance activities must verify compliance against the applicable design basis, hazardous-area classification method, and purchaser specification.

The correct answer isAbecause thecommon industry termfor adielectric withstand testis theHipot test, short forhigh-potential test. This test is used to verify that the insulation system of electrical equipment can withstand an applied voltage higher than its normal operating voltage for a specified period without breakdown, flashover, or excessive leakage current. It is widely used during factory testing and acceptance testing for equipment such as switchgear, control panels, transformers, motors, and cables.

In inspection practice, the dielectric withstand or Hipot test is an important confirmation of insulation integrity after assembly or manufacture. It is different from an insulation resistance test, which measures resistance in ohms using DC voltage. A Hipot test instead stresses the insulation at a specified elevated voltage to demonstrate that the insulation system is sound. The other options are incorrect becausevoltage testis too generic,current testdoes not describe the purpose, andcapacitor microfarad dielectric testis not a recognized common industry name. Therefore, the standard industry term for the dielectric withstand test isHipot test, makingoption Athe verified answer.