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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Electrical Testing Fundamentals and Theory | 25% | - Measurement Principles
|
| Topic 2: Safety | 15% | - Personal Protective Equipment (PPE)
|
| Topic 3: Systems and Commissioning | 5% | - System Testing
|
| Topic 4: Component Testing | 55% | - Circuit Breakers & Switchgear
|
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NEW QUESTION # 48
Three inductors of 60 mH, 120 mH, and 75 mH are connected inparallelwith no mutual inductance. What is the total inductance?
Answer: D
Explanation:
For inductors in parallel, the reciprocal of total inductance equals the sum of reciprocals of individual inductances:
1/L# = 1/60 + 1/120 + 1/75
Solving yields approximately26 mH. Understanding inductive behavior supports accurate interpretation of circuit performance and test results involving inductive components, especially in protection and control circuits.
NEW QUESTION # 49
When applying personal protective grounds, which connection must be madefirst?
Answer: B
Explanation:
The correct application of personal protective grounds is critical to worker safety and is strongly emphasized in NETA safety practices. When installing grounds, theequipment end must be attached first, ensuring the grounding conductor is securely bonded to earth or an effective ground source before any connection is made to energized or potentially energized conductors.
This sequence minimizes the risk of electric shock. If the phase conductor were connected first and the grounding system was not yet established, the worker could become the path to ground in the event of accidental energization. Once the equipment end is secured, phase conductors can be safely grounded.
When removing grounds, the reverse order is required: phase conductors are disconnected first, and the equipment end is removed last. NETA Level 2 technicians must follow this sequence consistently during maintenance, testing, and commissioning activities to ensure compliance with safety standards and prevent serious injury.
NEW QUESTION # 50
Each switchboard used asservice equipmentmust be provided with amain bonding jumper.
Answer: B
Explanation:
A main bonding jumper is required to connect the grounded conductor (neutral) to the equipment grounding conductor at the service disconnect. This establishes a low-impedance fault return path necessary for overcurrent devices to operate promptly. NETA Level 2 technicians must verify proper bonding during acceptance and maintenance inspections because improper bonding can lead to elevated touch potentials and ineffective fault clearing.
NEW QUESTION # 51
In azone-interlocked low-voltage circuit breakerscheme, if the breaker responsible for clearing a fault fails to operate, which statement is correct?
Answer: C
Explanation:
Zone-selective interlocking (ZSI) improves coordination by allowing downstream devices to trip first while restraining upstream devices. If the downstream breaker fails to clear the fault, restraint signals are removed and thenext upstream breaker tripsto isolate the fault.
NETA Level 2 technicians must understand this fail-safe behavior when commissioning protection systems and validating coordination logic.
NEW QUESTION # 52
Duringprimary current injection testingof a low-voltage circuit breaker, the breaker trips instantaneously at
8× its long-time pickup setting, even though the instantaneous element is set to10×. What is the MOST likely cause?
Answer: A
Explanation:
CT saturation occurs when the CT core cannot accurately reproduce high fault currents, causing distorted secondary current. This distortion can falsely trigger the instantaneous element at a lower current than expected. NETA Level 2 technicians must recognize CT saturation as a common cause of unexpected trip behavior during primary injection testing, particularly at high multiples of pickup.
NEW QUESTION # 53
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