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| Section | Weight | Objectives |
|---|---|---|
| Safety | 15% | - Personal Protective Equipment (PPE)
|
| Electrical Testing Fundamentals and Theory | 25% | - Basic Electrical Theory
|
| Component Testing | 55% | - Transformers
|
| Systems and Commissioning | 5% | - System Testing
|
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NEW QUESTION # 42
A digital multimeter (DMM), when set to measure voltage, typically has which type of input impedance?
Answer: A
Explanation:
Digital multimeters are designed withhigh, fixed input impedance-typically 10 megohms or higher-when measuring voltage. This minimizes loading effects on the circuit under test and allows accurate measurement without significantly altering circuit conditions.
NETA Level 2 technicians must understand meter characteristics to avoid misinterpretation of readings. High input impedance is especially important when testing control circuits, electronic relays, and high-resistance paths. Unlike analog meters, DMMs do not significantly load the circuit, making them suitable for precise voltage measurements in modern electrical systems.
NEW QUESTION # 43
ASTM D 924 is a required acceptance test for liquid-filled transformers containing natural ester insulating fluid according to NETA standards.
Answer: C
Explanation:
ASTM D 924 defines test methods forpower factor and dielectric lossof insulating liquids. NETA standards require this test for acceptance testing of liquid-filled transformers, including those usingnatural ester insulating fluids.
Power factor testing evaluates the condition of the insulating liquid by identifying contamination, moisture, and deterioration. Natural ester fluids, while environmentally advantageous, still require dielectric evaluation to ensure reliability and safety.
NETA Level 2 technicians must be familiar with required acceptance tests and understand why dielectric properties are critical indicators of insulation health.
NEW QUESTION # 44
Which section of a switchboard receives power from theservice sectionand distributes it to downstream loads?
Answer: A
Explanation:
The distribution section of a switchboard receives incoming power from the service section and feeds branch circuits, feeders, or downstream panels. During commissioning, NETA Level 2 technicians verify continuity, torque, insulation, and protective coordination within the distribution section to ensure reliable power delivery and safe operation.
NEW QUESTION # 45
Secondary injection testing of a low-voltage air circuit breaker is:
Answer: D
Explanation:
Secondary injection testing verifies the operation of thetrip unit electronics, but it does not test the entire current path, sensors, or mechanical trip linkage under load conditions. Primary injection testing is more comprehensive because it verifies the breaker's response to actual current flowing through the primary circuit.
NETA Level 2 technicians must understand the limitations of secondary injection and when primary injection is required for acceptance testing.
NEW QUESTION # 46
How many connection points are typically found on a Kelvin bridge used for low-resistance measurements?
Answer: B
Explanation:
A Kelvin bridge, also known as a four-wire resistance measurement device, usesfour connection pointsto accurately measure very low resistances. These consist of twocurrent terminalsand twopotential (voltage) terminals.
This configuration eliminates the effects of lead resistance and contact resistance, which can significantly distort measurements when testing bolted connections, bus joints, and grounding conductors. NETA Level 2 technicians routinely use Kelvin methods when performing low-resistance ohmic measurements during acceptance and maintenance testing.
Using fewer than four terminals would result in inaccurate readings, especially at milliohm or micro-ohm levels. Understanding this principle ensures proper test setup and reliable data interpretation.
NEW QUESTION # 47
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