NETA ETT Certified Level 3 Practice Exam 2024 Q&A A newly installed 4160V emergency generator has an insulation resistance value of 150 Megohms after one minute with an equipment temperature of 32 degrees C. Is this value acceptable per NETA standards? - CORRECT ANSWER -No NETA ATS -2017 Table 100.11 https://testguy.net/content/240 -Insulation -Resistance -Test-Values Know the NETA -ATS Insulation Resistance tables Which test method measures Hydrolyzable Flouride content in SF6 gas? - CORRECT ANSWER -ASTM D2284 [Standard Test Method for Acidity of Sulfur Hexafluoride] NETA ATS -2017 Table 100.13 Know the ASTM test names what what they test The operating speed of a protective relay is dependent on: - CORRECT ANSWER -* Spring Tension * Armature core air gap * Rate of flux built up https://en.wikipedia.org/wiki/Protective_relay#Types_according_to_construction This was originally a 'not question'. This list is not necessarily conclusive. It's simply the 'incorrect' answers to the 'not question'. According to IEEE C57.106, which test is recommended for routine acceptance of new, unprocessed oil from a supplier for use in circuit breakers? - CORRECT ANSWER -
ASTM D877 [Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes] https://hvtechnologies.com/which -oil-testing -standard -should -you-choose -to-determine -
dielectric -breakdown -voltage/ Know IEEE C57 information. Know ASTM tests and definitions Meter Sockets and meter disconnect switches should generally be connected on what side of a service disconnecting means? - CORRECT ANSWER -The line side NFPA 70 -2017 Article 230.82(3) https://www.electricallicenserenewal.com/Electrical -Continuing -Education -
Courses/NEC -Content.php?sectionID=40.0 This was originally a True/False statement question. The answer stated that the load side is wrong. The reference above seems to imply that meter sockets and meter disconnect switches should generally be connected on the line side. Know NFPA 70 What size neutral resistor would be required to limit the fault current of a 13,800 -
480Y/277V 1500kVA Transformer to 5A? - CORRECT ANSWER -55.4 Know Ohm's Law. 277 V / 5A = 55.4 ohms I believe that since this is dealing with the neutral, Line -Neutral voltage (277 V) should be used in the formula. 5 A on the line will also be 5A on the windings since the transformer configuration is a Wye configuration. I also believe that the impedance of the transformer is negligible in this calculation since it isn't mentioned in the question and presumably would only limit the fault current further. Correcting the power factor of three -phase loads normally involves adding (capacitance, inductance) in (series, parallel) - CORRECT ANSWER -capacitance in parallel http://archive.is/WOiLd Typically, power factor is offset by increased inductance. Adding capacitance in parallel corrects this. The voltage induced into the armature of a DC motor is known as the: - CORRECT ANSWER -CEMF [counter -electromotive force] https://en.wikipedia.org/wiki/Counter -electromotive_force As a battery cell starts discharging, internal resistance of the cell will _____ . - CORRECT ANSWER -increase http://batteryuniversity.com/learn/article/discharge_methods Link leads to a paywall. The reason why the internal resistance increases appears to have to do with change in electrolyte concentration. When conducting an ASTM D877 dielectric breakdown test, the fluid is continuously stirred. True or False - CORRECT ANSWER -False https://hvtechnologies.com/which -oil-testing -standard -should -you-choose -to-determine -
dielectric -breakdown -voltage/ Know ASTM tests and definitions. Know IEC tests and definitions. Some dielectric breakdown tests require stirring, some don't. I guess the point of the question is to test knowledge of which of these tests involve stirring. It is probably also useful to know the other differences between the tests. The tests are ASTM D8 77, ASTM D1816, and IEC 60156. What are the necessary requirements to operate two transformers in parallel? - CORRECT ANSWER -* Same Phase Angle Shift * Same Polarity * Same Phase Sequence * Same Frequency https://electrical -engineering -portal.com/principles -of-transformers -in-parallel -
connection -1 The original question was a 'not question'. There are other conditions which are nice to have for optimal operation but are not strictly necessary What are the convenient (but not necessary) requirements to operate two transformers in parallel? - CORRECT ANSWER -* Same voltage ratio and turns ratio * Same Percentage Impedance * Same KVA Rating * Same position of tap changer https://electrical -engineering -portal.com/principles -of-transformers -in-parallel -
connection -1 This is a question I made up that is derived from another question asking about necessary requirements. What is the maximum acceptable neutralization number for a new 35kV power transformer filled with FR3 insulating liquid that was tested in accordance with ASTM D974? - CORRECT ANSWER -0.03 mg KOH/g NETA ATS -2017 Table 100.4.3 In NFPA 70E Section 130.4, Shock Risk Assessment, if additional protective measures are required, what should be identified? - CORRECT ANSWER -* The design of the electrical equipment, including its over -current protective device * Personal and other protective equipment required * the boundary requirements NFPA 70E -2018 Section 130.4(B) What peak test voltage would you use to perform a VLF test on service aged cable rated 25kV according to NETA standards? - CORRECT ANSWER -33kV NETA MTS -2019 Table 100.6.3 http://testguy.net/content/278 -Power -Cable -Testing -and-Diagnostics -Overview#vlf Know NETA tables A trip latch check switch (T/LCS) functions to _____________. - CORRECT ANSWER -
Mechanically prevent the breaker from closing unless the trip latch returns to its reset position. http://testguy.net/content/150 -Circuit -Breaker -Terminology#latch_check_switch What is used to suppress the reverse polarity voltage spike in an electrical relay? - CORRECT ANSWER -resistor Which standard addresses equipment grounding? - CORRECT ANSWER -NFPA 70 Conduits and raceways, including end fittings, shall not rise more than ____ above the bottom of a switchboard enclosure. - CORRECT ANSWER -3 in NFPA 70 -2017 Section 408.5 Know NFPA 70
ASTM D877 [Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes] https://hvtechnologies.com/which -oil-testing -standard -should -you-choose -to-determine -
dielectric -breakdown -voltage/ Know IEEE C57 information. Know ASTM tests and definitions Meter Sockets and meter disconnect switches should generally be connected on what side of a service disconnecting means? - CORRECT ANSWER -The line side NFPA 70 -2017 Article 230.82(3) https://www.electricallicenserenewal.com/Electrical -Continuing -Education -
Courses/NEC -Content.php?sectionID=40.0 This was originally a True/False statement question. The answer stated that the load side is wrong. The reference above seems to imply that meter sockets and meter disconnect switches should generally be connected on the line side. Know NFPA 70 What size neutral resistor would be required to limit the fault current of a 13,800 -
480Y/277V 1500kVA Transformer to 5A? - CORRECT ANSWER -55.4 Know Ohm's Law. 277 V / 5A = 55.4 ohms I believe that since this is dealing with the neutral, Line -Neutral voltage (277 V) should be used in the formula. 5 A on the line will also be 5A on the windings since the transformer configuration is a Wye configuration. I also believe that the impedance of the transformer is negligible in this calculation since it isn't mentioned in the question and presumably would only limit the fault current further. Correcting the power factor of three -phase loads normally involves adding (capacitance, inductance) in (series, parallel) - CORRECT ANSWER -capacitance in parallel http://archive.is/WOiLd Typically, power factor is offset by increased inductance. Adding capacitance in parallel corrects this. The voltage induced into the armature of a DC motor is known as the: - CORRECT ANSWER -CEMF [counter -electromotive force] https://en.wikipedia.org/wiki/Counter -electromotive_force As a battery cell starts discharging, internal resistance of the cell will _____ . - CORRECT ANSWER -increase http://batteryuniversity.com/learn/article/discharge_methods Link leads to a paywall. The reason why the internal resistance increases appears to have to do with change in electrolyte concentration. When conducting an ASTM D877 dielectric breakdown test, the fluid is continuously stirred. True or False - CORRECT ANSWER -False https://hvtechnologies.com/which -oil-testing -standard -should -you-choose -to-determine -
dielectric -breakdown -voltage/ Know ASTM tests and definitions. Know IEC tests and definitions. Some dielectric breakdown tests require stirring, some don't. I guess the point of the question is to test knowledge of which of these tests involve stirring. It is probably also useful to know the other differences between the tests. The tests are ASTM D8 77, ASTM D1816, and IEC 60156. What are the necessary requirements to operate two transformers in parallel? - CORRECT ANSWER -* Same Phase Angle Shift * Same Polarity * Same Phase Sequence * Same Frequency https://electrical -engineering -portal.com/principles -of-transformers -in-parallel -
connection -1 The original question was a 'not question'. There are other conditions which are nice to have for optimal operation but are not strictly necessary What are the convenient (but not necessary) requirements to operate two transformers in parallel? - CORRECT ANSWER -* Same voltage ratio and turns ratio * Same Percentage Impedance * Same KVA Rating * Same position of tap changer https://electrical -engineering -portal.com/principles -of-transformers -in-parallel -
connection -1 This is a question I made up that is derived from another question asking about necessary requirements. What is the maximum acceptable neutralization number for a new 35kV power transformer filled with FR3 insulating liquid that was tested in accordance with ASTM D974? - CORRECT ANSWER -0.03 mg KOH/g NETA ATS -2017 Table 100.4.3 In NFPA 70E Section 130.4, Shock Risk Assessment, if additional protective measures are required, what should be identified? - CORRECT ANSWER -* The design of the electrical equipment, including its over -current protective device * Personal and other protective equipment required * the boundary requirements NFPA 70E -2018 Section 130.4(B) What peak test voltage would you use to perform a VLF test on service aged cable rated 25kV according to NETA standards? - CORRECT ANSWER -33kV NETA MTS -2019 Table 100.6.3 http://testguy.net/content/278 -Power -Cable -Testing -and-Diagnostics -Overview#vlf Know NETA tables A trip latch check switch (T/LCS) functions to _____________. - CORRECT ANSWER -
Mechanically prevent the breaker from closing unless the trip latch returns to its reset position. http://testguy.net/content/150 -Circuit -Breaker -Terminology#latch_check_switch What is used to suppress the reverse polarity voltage spike in an electrical relay? - CORRECT ANSWER -resistor Which standard addresses equipment grounding? - CORRECT ANSWER -NFPA 70 Conduits and raceways, including end fittings, shall not rise more than ____ above the bottom of a switchboard enclosure. - CORRECT ANSWER -3 in NFPA 70 -2017 Section 408.5 Know NFPA 70
