NETA ETT CERTIFIED LEVEL 3 EXAMS QUESTIONS WITH
COMPLETE SOLUTIONS VERIFIED AND UPDATED
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?
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?
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:
* 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?
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?
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?
,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)
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:
CEMF
[counter-electromotive force]
https://en.wikipedia.org/wiki/Counter-electromotive_force
As a battery cell starts discharging, internal resistance of the cell will _____ .
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
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 D877,
ASTM D1816, and IEC 60156.
What are the necessary requirements to operate two transformers in parallel?
* 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?
* Same voltage ratio and turns ratio
* Same Percentage Impedance
COMPLETE SOLUTIONS VERIFIED AND UPDATED
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?
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?
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:
* 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?
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?
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?
,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)
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:
CEMF
[counter-electromotive force]
https://en.wikipedia.org/wiki/Counter-electromotive_force
As a battery cell starts discharging, internal resistance of the cell will _____ .
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
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 D877,
ASTM D1816, and IEC 60156.
What are the necessary requirements to operate two transformers in parallel?
* 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?
* Same voltage ratio and turns ratio
* Same Percentage Impedance
