[Jun 09, 2026] NETA_2 Exam Dumps PDF Updated Dump from ActualPDF Guaranteed Success
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NEW QUESTION # 54
What is theminimum oxygen concentrationallowed before entering a transformer or similar enclosed electrical space?
- A. 10.0%
- B. 16.0%
- C. 19.5%
- D. 11.5%
Answer: D
Explanation:
An oxygen concentration of11.5%represents a dangerous condition that can rapidly impair physical and cognitive function. NETA safety guidance requires oxygen levels to be verified before entry into confined or enclosed spaces such as transformers. Entry below safe oxygen thresholds requires specialized respiratory protection and controls.
NEW QUESTION # 55
ASTM D 924 is a required acceptance test for liquid-filled transformers containing natural ester insulating fluid according to NETA standards.
- A. True
- B. Only for maintenance testing
- C. False
- D. Only above 69 kV
Answer: A
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 # 56
As frequency increases, theinductive reactanceof an inductor will:
- A. Increase
- B. Remain constant
- C. Decrease
- D. Become zero
Answer: A
Explanation:
Inductive reactance is defined as. As frequency increases, inductive reactance increases proportionally. This principle is essential for understanding AC circuit behavior, harmonic effects, and frequency-dependent impedance during testing and troubleshooting.
NEW QUESTION # 57
Which trigonometric function is equal to theopposite side divided by the hypotenuseof a right triangle?
- A. Tangent
- B. Sine
- C. Cosine
- D. Secant
Answer: B
Explanation:
Thesineof an angle is defined as the ratio of the opposite side to the hypotenuse. Trigonometry is used in power factor analysis, phasor relationships, impedance calculations, and AC circuit analysis. NETA Level 2 technicians must understand these relationships when evaluating voltage, current, and phase angles in testing scenarios.
NEW QUESTION # 58
You arrive to perform acceptance testing on a newly installed indoor 15 kV switchgear lineup. Covers are removed and conductors are exposed with taped ends. What is thecorrect initial action?
- A. Begin insulation resistance testing
- B. Verify the source is de-energized and apply lockout
- C. Assume the equipment is safe since it is new
- D. Proceed with visual inspection only
Answer: B
Explanation:
Before any testing or inspection begins, NETA safety practices require verification of anelectrically safe work condition. Even newly installed equipment may be energized unintentionally or improperly isolated.
Exposed conductors increase the risk of shock and arc flash.
The correct action is tovisually confirm that all sources of power have been de-energized, followed by properlockout/tagoutprocedures. This ensures no unexpected energization can occur during testing activities.
NETA Level 2 technicians must never assume equipment is safe based on installation status. Safety verification always precedes inspection, testing, or commissioning work.
NEW QUESTION # 59
The sum of all voltage drops around aseries circuitis:
- A. Zero
- B. Greater than the applied voltage
- C. Equal to the applied voltage
- D. Dependent on resistance values
Answer: C
Explanation:
Kirchhoff's Voltage Law states that the algebraic sum of voltages around any closed loop equals the applied voltage. This principle underpins circuit analysis and is essential for verifying expected readings during troubleshooting and commissioning.
NEW QUESTION # 60
Cells are connected inparallelin order to increase:
- A. Internal resistance
- B. Current capacity
- C. Voltage rating
- D. Power factor
Answer: B
Explanation:
When cells are connected in parallel, the voltage of the battery bank remains the same as a single cell, but the current capacity (ampere-hours)increases. Parallel connections allow multiple cells to share load current, increasing the total available current without increasing voltage. NETA Level 2 technicians frequently encounter parallel battery strings in control power systems and must understand this relationship when evaluating capacity, load testing, and charger performance.
NEW QUESTION # 61
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?
- A. Improper test lead placement
- B. Thermal memory enabled
- C. CT saturation
- D. Incorrect short-time delay setting
Answer: C
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 # 62
Which type of load is most commonly associated withharmonic distortion?
- A. Pure resistive loads
- B. Synchronous motors
- C. Linear inductive loads
- D. Variable frequency drives
Answer: D
Explanation:
Variable frequency drives (VFDs) are nonlinear loads that draw current in pulses, producing harmonics.
Understanding harmonic sources helps technicians evaluate heating, nuisance tripping, and power quality issues.
NEW QUESTION # 63
A digital multimeter (DMM), when set to measure voltage, typically has which type of input impedance?
- A. Variable impedance based on range
- B. Impedance proportional to measured voltage
- C. Low impedance to improve accuracy
- D. Fixed, high input impedance
Answer: D
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 # 64
A ground conductor is routed through azero-sequence current transformer (CT)together with the phase conductors feeding the load. What is the most likely result?
- A. The CT secondary will produce a higher than normal burden voltage
- B. Ground-fault protection will not function correctly because the residual current sums to zero
- C. Overcurrent protection will nuisance trip due to CT saturation
- D. Ground-fault protection becomes more sensitive and trips faster
Answer: B
Explanation:
Zero-sequence (residual) ground-fault detection works by measuring thevector sum of currentspassing through a CT window. Under normal conditions, the three phase currents sum to approximately zero. If a ground fault occurs, the return current path bypasses the CT window, producing a net residual current that the CT detects.
If theequipment grounding conductor(or neutral/ground return conductor, depending on the scheme) is incorrectly passed through the same CT window along with the phase conductors, the ground-fault return current can be "captured" by the CT. This causes the residual sum to approachzero, even during an actual ground fault-meaning the protective function mayfail to operate.
NETA Level 2 technicians are expected to recognize correct CT installation practices, especially during commissioning and acceptance testing of ground-fault protection schemes. This includes verifying CT polarity, conductor routing, window CT content, and proper secondary wiring before performing injection or functional trip tests. Misrouting conductors is a classic cause of non-operational ground-fault protection.
NEW QUESTION # 65
To reverse the direction of rotation of a three-phase induction motor, which action is required?
- A. Reverse any two phase conductors
- B. Reverse the neutral conductor
- C. Reverse all three phase conductors
- D. Reverse the control circuit polarity
Answer: A
Explanation:
The direction of rotation of a three-phase motor is determined by thephase sequenceof the supply voltage.
Reversingany two phase conductorschanges the phase sequence, which reverses the rotating magnetic field in the stator and therefore reverses motor rotation.
NETA Level 2 technicians frequently verify motor rotation during commissioning and after maintenance.
Understanding phase rotation is essential when performing bump tests, troubleshooting incorrect rotation, or verifying wiring after motor replacement. Reversing all three phases would preserve the original phase sequence and would not change rotation.
NEW QUESTION # 66
Following an insulation resistance test on a motor circuit, what procedure is required to safely return the circuit to a neutral charge state?
- A. Short the conductors together briefly
- B. Apply a DC discharge voltage
- C. Wait 30 minutes before re-energizing
- D. Ground the circuit for four times the charging duration
Answer: D
Explanation:
Insulation resistance testing leaves stored electrical charge in the insulation. NETA standards require grounding the circuit forfour times the duration of the applied test voltageto safely dissipate stored energy.
Failure to do so can result in dangerous shock hazards even after testing is complete.
NEW QUESTION # 67
Transformer oil samples drawn when the oil temperature isbelow 32°F (0°C)may:
- A. Show artificially high dielectric strength
- B. Be invalid for testing
- C. Not reveal free water
- D. Always indicate excessive moisture
Answer: C
Explanation:
At low temperatures, free water can solidify and remain suspended, preventing accurate detection. NETA Level 2 technicians must consider temperature effects when interpreting oil analysis results.
NEW QUESTION # 68
Which of the following equations correctly represents the relationship betweencapacitance (C),charge (Q), andvoltage (V)?
- A. V = Q / C²
- B. Q = C × V
- C. C = Q / V
- D. C = V / Q
Answer: C
Explanation:
Capacitance is defined as the amount of electric charge stored per unit of voltage applied across a capacitor.
Mathematically, this relationship is expressed asC = Q / V, where capacitance is measured in farads, charge in coulombs, and voltage in volts. NETA Level 2 technicians must understand this fundamental relationship when interpreting capacitor test data, evaluating dielectric performance, and understanding how voltage stress affects insulation systems. This equation also underpins energy storage calculations and dielectric stress analysis in power system components.
NEW QUESTION # 69
During aCT saturation test, voltage increases sharply with little increase in current. What does this indicate?
- A. CT burden is too low
- B. Secondary winding is open
- C. Core has reached saturation
- D. Ratio error is present
Answer: C
Explanation:
A sharp rise in voltage with minimal increase in current indicates the CT core has reachedmagnetic saturation. Beyond this point, the CT cannot accurately reproduce primary current. NETA Level 2 technicians must identify saturation points to ensure CTs are suitable for protection applications and that relay performance will be reliable during high-current faults.
NEW QUESTION # 70
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