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| Section | Weight | Objectives |
|---|---|---|
| Systems and Commissioning | 5% | - System Testing
|
| Component Testing | 55% | - Cables & Conductors
|
| Safety | 15% | - Electrically Safe Work Conditions
|
| Electrical Testing Fundamentals and Theory | 25% | - Basic Electrical Theory
|
>> Valid NETA_2 Test Syllabus <<
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NEW QUESTION # 80
What is the recommendedminimum insulation resistance valuefor motor windings manufactured before
1970?
Answer: C
Explanation:
For older motor windings, NETA guidance recognizes that insulation systems were often less robust than modern designs. The recommended minimum insulation resistance is100 megohms per kV of rated voltage plus 1 megohm.
This formula provides a baseline for evaluating insulation condition during acceptance or maintenance testing.
NETA Level 2 technicians must not only perform insulation resistance tests correctly, but also interpret results in the context of equipment age, voltage rating, and service conditions. Results below recommended minimums indicate potential moisture, contamination, or insulation degradation requiring corrective action.
NEW QUESTION # 81
Which instrument is used tolocate a fault in a 15 kV underground cable?
Answer: A
Explanation:
Atime-domain reflectometer (TDR)locates faults by measuring reflected signals caused by impedance discontinuities. NETA Level 2 technicians must recognize proper tools for underground cable diagnostics.
NEW QUESTION # 82
For photovoltaic (PV) systems, which device converts direct-current (DC) input into alternating-current (AC) output?
Answer: B
Explanation:
Photovoltaic systems generatedirect current (DC)electricity as a result of solar energy interacting with semiconductor materials. However, most building electrical systems and utility grids operate onalternating current (AC). The device responsible for converting DC output from PV arrays into usable AC power is an inverter.
Inverters perform more than simple conversion. Modern PV inverters also regulate voltage, synchronize frequency and phase with the utility grid, provide ground-fault detection, and include anti-islanding protection. NETA Level 2 technicians are expected to understand inverter operation because acceptance and maintenance testing often includes verifying correct inverter output voltage, frequency, and protective functions.
A rectifier performs the opposite function, converting AC to DC, and is commonly found in battery chargers and DC power supplies. Transformers change voltage levels but do not convert DC to AC.Converters may change DC voltage levels but do not produce alternating current.
Understanding inverter functionality is essential when testing renewable energy systems, performing commissioning activities, and verifying compliance with applicable electrical and safety standards.
NEW QUESTION # 83
In apurely inductive circuit, what is the phase relationship between voltage and current?
Answer: D
Explanation:
In a purely inductive circuit, current lags voltage by90 degrees, meaning voltage leads current by 90°. This phase relationship is foundational to understanding AC circuit behavior, protective relay operation, and power factor calculations-all within the expected knowledge scope of a NETA Level 2 technician.
NEW QUESTION # 84
During charging of lead-acid batteries, whichexplosive gasmay be generated?
Answer: A
Explanation:
Hydrogen gas is produced during battery charging due to electrolysis of water in the electrolyte. Hydrogen is highly explosive at relatively low concentrations. NETA Level 2 technicians must ensure adequate ventilation, eliminate ignition sources, and follow battery safety procedures during testing and maintenance.
NEW QUESTION # 85
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