NETA 3 FINAL EXAM 2026 QUESTIONS AND SOLUTIONS
RATED A+
✔✔In an alternator, when the rotor DC excitation current is removed there is a
possibility of damaging high voltages being developed. In order to limit voltage and
thereby prevent damage, a _____ or a diode can be included in the circuit. - ✔✔Field
discharge resistor
✔✔Sphere gaps are used for: - ✔✔All of the above
✔✔What is the tolerance allowed from the nameplate value when power factor testing
new liquid-filled transformer bushings? % - ✔✔50
✔✔What action level would apply to a Delta T of 15C between component and ambient
air? - ✔✔Repair as time permits
✔✔What is the minimum acceptable dielectric breakdown value for service-aged FR3
insulating liquid tested in accordance with ASTM D1816 using a 1mm gap? - ✔✔34kV
✔✔Which of the following maintenance tests is required for a 13200-480Y/277V
2500kVA dry-type transformer? - ✔✔Excitation at designated tap
✔✔Which Subpart of OSHA 29 CFR 1910 addresses electrical safety? - ✔✔S
✔✔True/false ASTM D 924 is a required acceptance test for liquid-filled transformers
with natural ester insulating fluid per NETA standards. - ✔✔False
✔✔Which of the following best describes the arc inside of a vacuum circuit breaker? -
✔✔Metal vapor
✔✔Which of the following features/accessories is LEAST likely to be found on an
automatic transfer switch installation? - ✔✔Current balance relay
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a single-phase, 27kV line sectionalizer with a rated impulse withstand voltage of
125kV? _____kV - ✔✔40
✔✔True/False On solidly grounded medium-voltage systems, the drain wire insulation
shield and/or metallic tape insulation shield can be used as an equipment grounding
conductor. - ✔✔False
RATED A+
✔✔In an alternator, when the rotor DC excitation current is removed there is a
possibility of damaging high voltages being developed. In order to limit voltage and
thereby prevent damage, a _____ or a diode can be included in the circuit. - ✔✔Field
discharge resistor
✔✔Sphere gaps are used for: - ✔✔All of the above
✔✔What is the tolerance allowed from the nameplate value when power factor testing
new liquid-filled transformer bushings? % - ✔✔50
✔✔What action level would apply to a Delta T of 15C between component and ambient
air? - ✔✔Repair as time permits
✔✔What is the minimum acceptable dielectric breakdown value for service-aged FR3
insulating liquid tested in accordance with ASTM D1816 using a 1mm gap? - ✔✔34kV
✔✔Which of the following maintenance tests is required for a 13200-480Y/277V
2500kVA dry-type transformer? - ✔✔Excitation at designated tap
✔✔Which Subpart of OSHA 29 CFR 1910 addresses electrical safety? - ✔✔S
✔✔True/false ASTM D 924 is a required acceptance test for liquid-filled transformers
with natural ester insulating fluid per NETA standards. - ✔✔False
✔✔Which of the following best describes the arc inside of a vacuum circuit breaker? -
✔✔Metal vapor
✔✔Which of the following features/accessories is LEAST likely to be found on an
automatic transfer switch installation? - ✔✔Current balance relay
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a single-phase, 27kV line sectionalizer with a rated impulse withstand voltage of
125kV? _____kV - ✔✔40
✔✔True/False On solidly grounded medium-voltage systems, the drain wire insulation
shield and/or metallic tape insulation shield can be used as an equipment grounding
conductor. - ✔✔False
