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| Section | Weight | Objectives |
|---|---|---|
| Safety | 15% | - Electrical Safety Fundamentals
|
| Component Testing | 55% | - Electrical Equipment Testing
|
| Electrical Testing Fundamentals and Theory | 25% | - Measurement Principles
|
| Systems and Commissioning | 5% | - System-Level Testing
|
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NEW QUESTION # 67
How many connection points are typically found on a Kelvin bridge used for low-resistance measurements?
Answer: A
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 # 68
An induction motor has a 40 kVA input, a power factor of 0.82, and an efficiency of 92%. What is the approximate output horsepower?
Answer: A
Explanation:
To calculate motor horsepower, real power must first be determined. Real power (kW) is calculated by multiplying apparent power (kVA) by power factor:
Real Power = 40 kVA × 0.82 = 32.8 kW
Next, efficiency must be applied to determine output power:
Output Power = 32.8 kW × 0.92 = 30.176 kW
Horsepower is calculated by converting kilowatts to horsepower using the conversion factor:
1 HP # 0.746 kW
Horsepower = 30.176 ÷ 0.746 #30.2 HP
NETA Level 2 technicians are expected to understand power relationships, including apparent power, real power, power factor, and efficiency. These calculations are commonly used when evaluating motor performance, loading conditions, and acceptance testing results.
NEW QUESTION # 69
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 # 70
Power factor is defined as:
Answer: C
Explanation:
Power factor is the ratio ofreal power (watts)toapparent power (volt-amperes). This ratio indicates how effectively electrical power is being converted into useful work. NETA Level 2 technicians must understand power factor when evaluating system efficiency, loading, and the impact of reactive components.
NEW QUESTION # 71
What is the purpose of ablow-out coilin a circuit breaker?
Answer: C
Explanation:
A blow-out coil produces a magnetic field that forces the arc into an arc chute, lengthening and cooling it to aid extinction. NETA Level 2 technicians must understand arc-control mechanisms when inspecting breaker design and evaluating interruption performance.
NEW QUESTION # 72
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