NETA 3 EVALUATION EXAM 2026 QUESTIONS AND
SOLUTIONS RATED A+
✔✔Which of the following is not a common diagnostic test that can be performed using
the tan-delta test set: - ✔✔VLF-DC
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a three-phase, 15kV line sectionalizer with a rated impulse withstand voltage of
95kV? - ✔✔26.2kV
✔✔A grounding connection to earth from a lightning protection system should be made
at diagonal corners of the structure. - ✔✔True
✔✔Which of the following would significantly reduce ground grid impedance? -
✔✔Double ground rod length
✔✔What is the minimum acceptable megohm value for a metal-oxide surge arrester
rated 15kV with an MCOV rating of 12.7kV per NETA standards? - ✔✔5,000 Megohms
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 230kV equipment? - ✔✔60kV
✔✔The ________ rating refers to the maximum current a protective device, such as a
fuse or circuit breaker, can safely interrupt. - ✔✔interrupting
✔✔Distance Relays may be directional or non-directional. - ✔✔True
✔✔Which of the following would you not expect to find in an IEC 61850 object name? -
✔✔Device Address
✔✔A single-phase transformer has a nameplate voltage rating of 7,200/480. The actual
incoming voltage is 6,700V. A secondary voltage of 460V is desired. Which of the
following taps available on the no-load tap changer, should be used to obtain the closes
possible voltage to the desired voltage? - ✔✔7,020
✔✔What is the maximum acceptable value for an ASTM D924 test on service-aged
silicone insulating liquid? - ✔✔0.20
✔✔Determining the dielectric breakdown voltage of insulating liquid using ASTM D877
utilizes a ____ electrode, while ASTM D1816 utilizes a ____ electrode. - ✔✔flat disk,
mushroom-shaped
,✔✔The total travel distance of circuit breaker contacts from resting position in the
closed state to the resting position in the open state, or vice versa is defined as: -
✔✔Contact stroke
✔✔What is the maximum acceptable value for Air and/or Carbon Tetra-fluoride found in
service-aged SF6 gas? - ✔✔3.0% volume
✔✔According to NETA, analog test equipment should be calibrated in accordance with
which frequency schedule: - ✔✔12 months maximum
✔✔In an RC parallel circuit, the voltage across the resistor and the voltage across the
capacitor are - ✔✔In Phase
✔✔One set of service-entrance conductors, either overhead or underground, is
permitted to supply ____ service disconnecting means in lieu of a single main
disconnect. - ✔✔2 to 6
✔✔Transmission lines that have a source impedance ratio (SIR) greater than 4 are
classified as ______. - ✔✔short lines
✔✔Additional services shall be permitted where the capacity requirements are in
excess of _____ at a supply voltage of 1000 volts or less. - ✔✔2000 A
✔✔Building A is supplied with 120/240 volt single-phase power from Building B on the
same property. Building B is supplied from a three-wire with two ungrounded conductors
and one neutral without any metallic water pipe or other metal equipment connections to
the building or equipment ground fault protection installed. The neutral conductor must:
- ✔✔Not be connected to a grounding electrode in the second building
✔✔The reactance of a synchronous machine depends upon: - ✔✔Degree of saturation
of magnetic core
✔✔Hydrogen clings to the positive plate in primary cell and thus effectively reduces the
effective surface of this plate resulting in reduction in the EMF of the cell. This
phenomenon is known as: - ✔✔Polarization
✔✔Optional standby systems are typically installed to provide an alternate source of
power for which of the following? - ✔✔data processing and communication systems
✔✔A three-phase bolted fault would primarily produce which type of current? -
✔✔Positive sequence current.
, ✔✔Cables that are not approved for mounting in contact with a building or other
structure shall be mounted on insulating supports installed at intervals not exceeding
_____. - ✔✔15 feet
✔✔Power transformer cooling classes went through major changes in the United States
when IEEE Standard C57.12.00-2000 adopted the modern four-letter designation.
Which of the following old designations does not match the new? - ✔✔OA/FOA =
ONAN/ONAF
✔✔ASTM test method D924 measures which of the following? - ✔✔percent
✔✔Which of the following electrical tests would you not perform on a new capacitor? -
✔✔Dielectric withstand voltage
✔✔When conducting an ASTM D1816 dielectric breakdown test, the fluid is
continuously stirred. - ✔✔True
✔✔Capacitance is directly proportional to the length of the conducting plates, not width.
- ✔✔False
✔✔Which is the correct definition of TDD as put forth in IEEE 1159? - ✔✔TDD is the
total rms harmonic current distortion, in percent of the maximum demand load current
(15 or 30 min demand).
✔✔Which of the following maintenance tests is optional for a 13200-480Y/277V
2500kVA dry-type transformer? - ✔✔resistance of each winding at designated tap
✔✔Which of the following is is one optional test given for microprocessor protective
relays in Section 7.9.2 of ANSI/NETA MTS? - ✔✔Functional operation of each element
✔✔When arcing occurs in SF6 , what is one hazardous byproduct? - ✔✔metal fluorides
✔✔In case of multiple grounding connections, in order to reduce the objectionable
current all grounding connections shall be disconnected. - ✔✔False
✔✔What does a kilowatt-hour meter read? - ✔✔Energy Use
✔✔A switch or circuit breaker enclosure may be used as a raceway if the conductor fill
does not exceed _____ . - ✔✔40%
✔✔What is the minimum acceptable test limit for an ASTM D877 test on mineral oil
used in new 69kV equipment? - ✔✔30kV
SOLUTIONS RATED A+
✔✔Which of the following is not a common diagnostic test that can be performed using
the tan-delta test set: - ✔✔VLF-DC
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a three-phase, 15kV line sectionalizer with a rated impulse withstand voltage of
95kV? - ✔✔26.2kV
✔✔A grounding connection to earth from a lightning protection system should be made
at diagonal corners of the structure. - ✔✔True
✔✔Which of the following would significantly reduce ground grid impedance? -
✔✔Double ground rod length
✔✔What is the minimum acceptable megohm value for a metal-oxide surge arrester
rated 15kV with an MCOV rating of 12.7kV per NETA standards? - ✔✔5,000 Megohms
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 230kV equipment? - ✔✔60kV
✔✔The ________ rating refers to the maximum current a protective device, such as a
fuse or circuit breaker, can safely interrupt. - ✔✔interrupting
✔✔Distance Relays may be directional or non-directional. - ✔✔True
✔✔Which of the following would you not expect to find in an IEC 61850 object name? -
✔✔Device Address
✔✔A single-phase transformer has a nameplate voltage rating of 7,200/480. The actual
incoming voltage is 6,700V. A secondary voltage of 460V is desired. Which of the
following taps available on the no-load tap changer, should be used to obtain the closes
possible voltage to the desired voltage? - ✔✔7,020
✔✔What is the maximum acceptable value for an ASTM D924 test on service-aged
silicone insulating liquid? - ✔✔0.20
✔✔Determining the dielectric breakdown voltage of insulating liquid using ASTM D877
utilizes a ____ electrode, while ASTM D1816 utilizes a ____ electrode. - ✔✔flat disk,
mushroom-shaped
,✔✔The total travel distance of circuit breaker contacts from resting position in the
closed state to the resting position in the open state, or vice versa is defined as: -
✔✔Contact stroke
✔✔What is the maximum acceptable value for Air and/or Carbon Tetra-fluoride found in
service-aged SF6 gas? - ✔✔3.0% volume
✔✔According to NETA, analog test equipment should be calibrated in accordance with
which frequency schedule: - ✔✔12 months maximum
✔✔In an RC parallel circuit, the voltage across the resistor and the voltage across the
capacitor are - ✔✔In Phase
✔✔One set of service-entrance conductors, either overhead or underground, is
permitted to supply ____ service disconnecting means in lieu of a single main
disconnect. - ✔✔2 to 6
✔✔Transmission lines that have a source impedance ratio (SIR) greater than 4 are
classified as ______. - ✔✔short lines
✔✔Additional services shall be permitted where the capacity requirements are in
excess of _____ at a supply voltage of 1000 volts or less. - ✔✔2000 A
✔✔Building A is supplied with 120/240 volt single-phase power from Building B on the
same property. Building B is supplied from a three-wire with two ungrounded conductors
and one neutral without any metallic water pipe or other metal equipment connections to
the building or equipment ground fault protection installed. The neutral conductor must:
- ✔✔Not be connected to a grounding electrode in the second building
✔✔The reactance of a synchronous machine depends upon: - ✔✔Degree of saturation
of magnetic core
✔✔Hydrogen clings to the positive plate in primary cell and thus effectively reduces the
effective surface of this plate resulting in reduction in the EMF of the cell. This
phenomenon is known as: - ✔✔Polarization
✔✔Optional standby systems are typically installed to provide an alternate source of
power for which of the following? - ✔✔data processing and communication systems
✔✔A three-phase bolted fault would primarily produce which type of current? -
✔✔Positive sequence current.
, ✔✔Cables that are not approved for mounting in contact with a building or other
structure shall be mounted on insulating supports installed at intervals not exceeding
_____. - ✔✔15 feet
✔✔Power transformer cooling classes went through major changes in the United States
when IEEE Standard C57.12.00-2000 adopted the modern four-letter designation.
Which of the following old designations does not match the new? - ✔✔OA/FOA =
ONAN/ONAF
✔✔ASTM test method D924 measures which of the following? - ✔✔percent
✔✔Which of the following electrical tests would you not perform on a new capacitor? -
✔✔Dielectric withstand voltage
✔✔When conducting an ASTM D1816 dielectric breakdown test, the fluid is
continuously stirred. - ✔✔True
✔✔Capacitance is directly proportional to the length of the conducting plates, not width.
- ✔✔False
✔✔Which is the correct definition of TDD as put forth in IEEE 1159? - ✔✔TDD is the
total rms harmonic current distortion, in percent of the maximum demand load current
(15 or 30 min demand).
✔✔Which of the following maintenance tests is optional for a 13200-480Y/277V
2500kVA dry-type transformer? - ✔✔resistance of each winding at designated tap
✔✔Which of the following is is one optional test given for microprocessor protective
relays in Section 7.9.2 of ANSI/NETA MTS? - ✔✔Functional operation of each element
✔✔When arcing occurs in SF6 , what is one hazardous byproduct? - ✔✔metal fluorides
✔✔In case of multiple grounding connections, in order to reduce the objectionable
current all grounding connections shall be disconnected. - ✔✔False
✔✔What does a kilowatt-hour meter read? - ✔✔Energy Use
✔✔A switch or circuit breaker enclosure may be used as a raceway if the conductor fill
does not exceed _____ . - ✔✔40%
✔✔What is the minimum acceptable test limit for an ASTM D877 test on mineral oil
used in new 69kV equipment? - ✔✔30kV
