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| Section | Weight | Objectives |
|---|---|---|
| Systems and Commissioning | 5% | - Commissioning Practices
|
| Component Testing | 55% | - Transformers
|
| Electrical Testing Fundamentals and Theory | 25% | - Measurement Principles
|
| Safety | 15% | - Regulatory Standards
|
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NEW QUESTION # 74
What is meant by adead-tank circuit breaker?
Answer: C
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 # 75
Polarization Index (PI) is defined as the ratio of insulation resistance measured at:
Answer: C
Explanation:
Polarization Index evaluates insulation quality over time and is calculated as:
PI = IR at 10 minutes ÷ IR at 1 minute.
NETA Level 2 technicians use PI testing to assess insulation dryness, cleanliness, and aging.
NEW QUESTION # 76
A1500:5 multi-ratio CTproduces400 Vat the1200:5 tapduring saturation testing. What voltage is expected at the1500:5 tap?
Answer: A
Explanation:
Voltage is proportional to the number of turns. Moving from a 1200:5 ratio to 1500:5 increases turns by a factor of:
1500 / 1200 = 1.25
Expected voltage = 400 × 1.25 =500 V
NETA Level 2 technicians must accurately scale saturation test results across CT taps to verify performance and protection reliability.
NEW QUESTION # 77
Shown below is a current transformer with multiple secondary taps. What is the calculated voltage between tapsX1 and X3when200 Vis applied across the full secondary windingX1 to X5?
Answer: B
Explanation:
The voltage developed across a portion of a CT secondary winding is proportional to the number of turns between the selected taps. If 200 V is applied across the full winding from X1 to X5, and the diagram shows that taps X1 to X3 represent 30% of the total turns, then the voltage across X1-X3 is:
200 V × 0.30 =60 V
NETA Level 2 technicians must understand tap relationships during saturation testing, ratio testing, and troubleshooting CT secondary circuits. Incorrect assumptions about tap voltages can result in inaccurate test results or insulation damage during testing.
NEW QUESTION # 78
Which portion of a three-phase system carries current through the windings of a transformer or motor?
Answer: C
Explanation:
Phase currentis the current that flows through each individual winding of a three-phase device such as a transformer or motor. Understanding the difference between phase current and line current is critical because their magnitudes differ depending on whether the system is configured as wye or delta. NETA Level 2 technicians must correctly identify which current is being measured to avoid misinterpreting test results during commissioning, troubleshooting, and performance verification.
NEW QUESTION # 79
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