NETA 3 COMPREHENSIVE SETS ANSWERS AND
QUESTIONS SET A+
The alternate source for emergency systems are required to be equipped with ground-
fault protection of equipment. - ✔✔False
✔✔Which ANSI/IEEE standard covers SF6 circuit breakers? - ✔✔C37.04
✔✔You measure the winding resistance of a 12.4kV, 1000kVA, Delta-Delta connected
transformer with a 100A test set. H1-H2 measures 42.0 microhms, H2-H3 measures
41.9 microhms, and H3-H1 measures 84.0 microhms. What can you conclude from
these readings? - ✔✔One phase of the transformer is open.
✔✔When monitoring for entries involving a decent into atmospheres that may be
stratisfied, the envelope should be tested at a distance of approximately _____ feet in
the direction of travel and to each side. - ✔✔4
✔✔The transformer manufacturer should be consulted if winding-resistance test values
vary by more than _____ percent from factory test values or between adjacent phases
according to NETA acceptance testing standards. - ✔✔2
✔✔A DC shunt motor should never be operated: - ✔✔with the field circuit open
✔✔What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? - ✔✔20
✔✔The generally accepted limits of deviation from the nominal 60Hz utility power
frequency is: - ✔✔.50Hz
✔✔Power Factor testing is least effective on which of the following? - ✔✔MV Cable
,✔✔Which of the following insulating liquid tests is optional when maintenance testing a
13.2kV-4.16kV 1500kVA transformer with silicone fluid per NETA standards? -
✔✔ASTM D1298
✔✔Panelboards equipped with snap switches of rating 30 amps or less shall be
provided with over-current protection of not more than _____ . - ✔✔200 amps
✔✔Underground service conductors between the terminals of service equipment and
service lateral or underground service conductors are termed as _____ . - ✔✔Service
Entrance Conductors
✔✔What is a dual element fuse used for? - ✔✔Operate with a temporary overload
✔✔The full-load current for a single-phase alternating current 115 volt, 1 horsepower
motor is which of the following: - ✔✔16 A
✔✔Infrared surveys should be performed during periods of maximum possible loading
but not less than _____ % of rated load of the electrical equipment being inspected. -
✔✔40
✔✔Decreasing the opening time of the overcurrent protective device will decrease Arc-
Flash hazards. - ✔✔true
✔✔In a wye connected system, without neutral grounding, zero sequence currents are:
- ✔✔zero
✔✔When evaluating insulation test results on a medium-voltage, air-magnetic circuit
breaker, what quantity is evaluated? - ✔✔watts-loss
✔✔In accordance with NETA and IEEE standards, the correct acceptance test voltage
(dc) for 35KV rated EPR 133% insulation level cable is? - ✔✔124kV
✔✔Calculate the circuit time constant of an inductor having resistance value of 100
ohms and an inductance value of 4 Henry: - ✔✔0.04 sec
T=L/R
✔✔Transformer polarity: - ✔✔Is of concern when multiple sets of primary and
secondary windings are interconnected
✔✔Identify the least reliable power system arrangement: - ✔✔Radial w/ Primary
Selectivity
, ✔✔The hot collar bushing test should be performed using which of the following test
modes? - ✔✔UST
GST
GST-g
✔✔R rated fuses are used for: - ✔✔Protection for motors
R-rated fuses provide required short-circuit protection for medium voltage motors, motor
controllers and associated circuitry. Relays provide both overload protection and locked
rotor protection to the motor.
✔✔Which of the following would be a factor in choosing between 100%, 133%, and
173% Medium voltage cable for a power system? - ✔✔Ground Fault protection
✔✔During the performance of a thermographic scan of similar components within the
switchboard that are under similar load, at what temperature difference does NETA
recommend investigation? - ✔✔1-3 deg C
✔✔In calculating the thickness of insulators for high-voltage AC power lines, which type
of measurement is the best to use for voltage? - ✔✔Peak
✔✔What type of sensing element can measure a transformer's hottest-spot (winding)
temperature directly? - ✔✔Fiber optic cable
✔✔Before acceptance testing begins, what steps should be taken as part of the
commissioning process? - ✔✔Inspect devices for variations from design specifications
✔✔Which of the following would not significantly reduce ground resistance? -
✔✔Increased ground rod diameter
✔✔In a typical stepped distance protection scheme, Zone 4 is used as a backup for an
adjacent transmission line in the reverse direction in case the protection in that line fails.
This zone is usually set to _____ of the adjacent line. - ✔✔20-50%
✔✔The power factor of SF6 circuit breaker bushings is to be within _____ percent of
nameplate per NETA-ATS. - ✔✔10%
✔✔Two 5H inductors connected in series are subjected to an electric current that
changes at a rate of 4.5 amps per second. How much voltage will be dropped across
the series combination? - ✔✔45.00
V = L(di/dt)
Be aware of "Two 5H inductors" - Inductors Add
QUESTIONS SET A+
The alternate source for emergency systems are required to be equipped with ground-
fault protection of equipment. - ✔✔False
✔✔Which ANSI/IEEE standard covers SF6 circuit breakers? - ✔✔C37.04
✔✔You measure the winding resistance of a 12.4kV, 1000kVA, Delta-Delta connected
transformer with a 100A test set. H1-H2 measures 42.0 microhms, H2-H3 measures
41.9 microhms, and H3-H1 measures 84.0 microhms. What can you conclude from
these readings? - ✔✔One phase of the transformer is open.
✔✔When monitoring for entries involving a decent into atmospheres that may be
stratisfied, the envelope should be tested at a distance of approximately _____ feet in
the direction of travel and to each side. - ✔✔4
✔✔The transformer manufacturer should be consulted if winding-resistance test values
vary by more than _____ percent from factory test values or between adjacent phases
according to NETA acceptance testing standards. - ✔✔2
✔✔A DC shunt motor should never be operated: - ✔✔with the field circuit open
✔✔What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? - ✔✔20
✔✔The generally accepted limits of deviation from the nominal 60Hz utility power
frequency is: - ✔✔.50Hz
✔✔Power Factor testing is least effective on which of the following? - ✔✔MV Cable
,✔✔Which of the following insulating liquid tests is optional when maintenance testing a
13.2kV-4.16kV 1500kVA transformer with silicone fluid per NETA standards? -
✔✔ASTM D1298
✔✔Panelboards equipped with snap switches of rating 30 amps or less shall be
provided with over-current protection of not more than _____ . - ✔✔200 amps
✔✔Underground service conductors between the terminals of service equipment and
service lateral or underground service conductors are termed as _____ . - ✔✔Service
Entrance Conductors
✔✔What is a dual element fuse used for? - ✔✔Operate with a temporary overload
✔✔The full-load current for a single-phase alternating current 115 volt, 1 horsepower
motor is which of the following: - ✔✔16 A
✔✔Infrared surveys should be performed during periods of maximum possible loading
but not less than _____ % of rated load of the electrical equipment being inspected. -
✔✔40
✔✔Decreasing the opening time of the overcurrent protective device will decrease Arc-
Flash hazards. - ✔✔true
✔✔In a wye connected system, without neutral grounding, zero sequence currents are:
- ✔✔zero
✔✔When evaluating insulation test results on a medium-voltage, air-magnetic circuit
breaker, what quantity is evaluated? - ✔✔watts-loss
✔✔In accordance with NETA and IEEE standards, the correct acceptance test voltage
(dc) for 35KV rated EPR 133% insulation level cable is? - ✔✔124kV
✔✔Calculate the circuit time constant of an inductor having resistance value of 100
ohms and an inductance value of 4 Henry: - ✔✔0.04 sec
T=L/R
✔✔Transformer polarity: - ✔✔Is of concern when multiple sets of primary and
secondary windings are interconnected
✔✔Identify the least reliable power system arrangement: - ✔✔Radial w/ Primary
Selectivity
, ✔✔The hot collar bushing test should be performed using which of the following test
modes? - ✔✔UST
GST
GST-g
✔✔R rated fuses are used for: - ✔✔Protection for motors
R-rated fuses provide required short-circuit protection for medium voltage motors, motor
controllers and associated circuitry. Relays provide both overload protection and locked
rotor protection to the motor.
✔✔Which of the following would be a factor in choosing between 100%, 133%, and
173% Medium voltage cable for a power system? - ✔✔Ground Fault protection
✔✔During the performance of a thermographic scan of similar components within the
switchboard that are under similar load, at what temperature difference does NETA
recommend investigation? - ✔✔1-3 deg C
✔✔In calculating the thickness of insulators for high-voltage AC power lines, which type
of measurement is the best to use for voltage? - ✔✔Peak
✔✔What type of sensing element can measure a transformer's hottest-spot (winding)
temperature directly? - ✔✔Fiber optic cable
✔✔Before acceptance testing begins, what steps should be taken as part of the
commissioning process? - ✔✔Inspect devices for variations from design specifications
✔✔Which of the following would not significantly reduce ground resistance? -
✔✔Increased ground rod diameter
✔✔In a typical stepped distance protection scheme, Zone 4 is used as a backup for an
adjacent transmission line in the reverse direction in case the protection in that line fails.
This zone is usually set to _____ of the adjacent line. - ✔✔20-50%
✔✔The power factor of SF6 circuit breaker bushings is to be within _____ percent of
nameplate per NETA-ATS. - ✔✔10%
✔✔Two 5H inductors connected in series are subjected to an electric current that
changes at a rate of 4.5 amps per second. How much voltage will be dropped across
the series combination? - ✔✔45.00
V = L(di/dt)
Be aware of "Two 5H inductors" - Inductors Add
