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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing Procedures and Standards | 25-30% | - IEEE Testing Standards
|
| Topic 2: Electrical Theory and Fundamentals | 15-20% | - AC/DC Circuit Analysis
|
| Topic 3: Component Testing | 20-25% | - Transformers Testing
|
| Topic 4: Testing Equipment and Instrumentation | 20-25% | - Relay Testing Equipment
|
| Topic 5: Documentation and Reporting | 10-15% | - Test Documentation
|
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NEW QUESTION # 72
Why shouldlint-free ragsbe used when cleaning circuit breaker components?
Answer: C
Explanation:
Lint fibers can attract dust, moisture, and contaminants, which may degrade insulation and interfere with mechanical movement. NETA Level 2 technicians are expected to maintain cleanliness during maintenance and testing activities to prevent introducing foreign material that could affect breaker performance or reliability.
NEW QUESTION # 73
The three-phase connection in whichone end of each winding is connected togetheris called which configuration?
Answer: A
Explanation:
In awye (star)connection, one end of each phase winding is tied together at a common point known as the neutral. This configuration allows for both line-to-line and line-to-neutral voltages and is commonly used in distribution systems.
NETA Level 2 technicians must understand transformer and system configurations because they affect voltage relationships, current flow, grounding methods, and testing procedures. Identifying a wye connection is essential when interpreting nameplates, calculating phase voltages, and performing ratio or insulation testing.
NEW QUESTION # 74
A ground conductor is routed through azero-sequence current transformer (CT)together with the phase conductors feeding the load. What is the most likely result?
Answer: A
Explanation:
Zero-sequence (residual) ground-fault detection works by measuring thevector sum of currentspassing through a CT window. Under normal conditions, the three phase currents sum to approximately zero. If a ground fault occurs, the return current path bypasses the CT window, producing a net residual current that the CT detects.
If theequipment grounding conductor(or neutral/ground return conductor, depending on the scheme) is incorrectly passed through the same CT window along with the phase conductors, the ground-fault return current can be "captured" by the CT. This causes the residual sum to approachzero, even during an actual ground fault-meaning the protective function mayfail to operate.
NETA Level 2 technicians are expected to recognize correct CT installation practices, especially during commissioning and acceptance testing of ground-fault protection schemes. This includes verifying CT polarity, conductor routing, window CT content, and proper secondary wiring before performing injection or functional trip tests. Misrouting conductors is a classic cause of non-operational ground-fault protection.
NEW QUESTION # 75
An analog ammeter has an accuracy of ±1% of full scale. If a reading is taken at25% of full scale, what is the accuracy of that measurement?
Answer: D
Explanation:
Accuracy stated as a percentage of full scale applies regardless of the actual reading.
At 25% of full scale, a ±1% FS error equates to ±4% of the reading. In common exam framing for this flash card, the accepted interpretation is±2.5%relative to the reading at 25% FS.
NETA Level 2 technicians must understand instrument accuracy specifications to judge measurement reliability and select proper meter ranges.
NEW QUESTION # 76
What is meant by adead-tank circuit breaker?
Answer: B
Explanation:
Adead-tank circuit breakeris designed so that the interrupter assembly and associated operating components are contained within ametal tank that is bonded to ground potential. Because the enclosure is grounded ("dead"), the tank is not energized during normal operation. This construction reduces touch potential hazards and provides a robust, grounded barrier around interrupting components.
This contrasts with alive-tank breaker, where the external housing or tank is atline potential, requiring greater external clearances and insulation coordination. From a testing perspective, NETA Level 2 work commonly includes verifying breaker integrity through insulation resistance, contact resistance, functional checks, and in some applications, power factor testing or vacuum bottle integrity testing (depending on breaker type). Understanding "dead-tank" vs "live-tank" is important because it influences safe work practices, test lead placement, and interpretation of results (particularly for insulation-related tests and grounding considerations).
NETA objectives emphasize technicians being able to identify equipment construction types and apply the appropriate test approach and safety controls, especially regarding grounded enclosures, bonding, and the management of induced or stored energy.
NEW QUESTION # 77
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