NETA III Exam Questions with
Complete Solutions28
The alternate source for emergency systems are required to be equipped with ground-fault
protection of equipment. - ANSWERS-False
Which ANSI/IEEE standard covers SF6 circuit breakers? - ANSWERS-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? - ANSWERS-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. - ANSWERS-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. - ANSWERS-2
A DC shunt motor should never be operated: - ANSWERS-with the field circuit open
What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? - ANSWERS-20
The generally accepted limits of deviation from the nominal 60Hz utility power frequency is: -
ANSWERS-.50Hz
,Power Factor testing is least effective on which of the following? - ANSWERS-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? - ANSWERS-ASTM D1298
Panelboards equipped with snap switches of rating 30 amps or less shall be provided with over-
current protection of not more than _____ . - ANSWERS-200 amps
Underground service conductors between the terminals of service equipment and service
lateral or underground service conductors are termed as _____ . - ANSWERS-Service Entrance
Conductors
What is a dual element fuse used for? - ANSWERS-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: - ANSWERS-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. - ANSWERS-40
Decreasing the opening time of the overcurrent protective device will decrease Arc-Flash
hazards. - ANSWERS-true
In a wye connected system, without neutral grounding, zero sequence currents are: - ANSWERS-
zero
When evaluating insulation test results on a medium-voltage, air-magnetic circuit breaker, what
quantity is evaluated? - ANSWERS-watts-loss
, In accordance with NETA and IEEE standards, the correct acceptance test voltage (dc) for 35KV
rated EPR 133% insulation level cable is? - ANSWERS-124kV
Calculate the circuit time constant of an inductor having resistance value of 100 ohms and an
inductance value of 4 Henry: - ANSWERS-0.04 sec
T=L/R
Transformer polarity: - ANSWERS-Is of concern when multiple sets of primary and secondary
windings are interconnected
Identify the least reliable power system arrangement: - ANSWERS-Radial w/ Primary Selectivity
The hot collar bushing test should be performed using which of the following test modes? -
ANSWERS-UST
GST
GST-g
R rated fuses are used for: - ANSWERS-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? - ANSWERS-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? - ANSWERS-1-3 deg C
Complete Solutions28
The alternate source for emergency systems are required to be equipped with ground-fault
protection of equipment. - ANSWERS-False
Which ANSI/IEEE standard covers SF6 circuit breakers? - ANSWERS-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? - ANSWERS-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. - ANSWERS-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. - ANSWERS-2
A DC shunt motor should never be operated: - ANSWERS-with the field circuit open
What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? - ANSWERS-20
The generally accepted limits of deviation from the nominal 60Hz utility power frequency is: -
ANSWERS-.50Hz
,Power Factor testing is least effective on which of the following? - ANSWERS-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? - ANSWERS-ASTM D1298
Panelboards equipped with snap switches of rating 30 amps or less shall be provided with over-
current protection of not more than _____ . - ANSWERS-200 amps
Underground service conductors between the terminals of service equipment and service
lateral or underground service conductors are termed as _____ . - ANSWERS-Service Entrance
Conductors
What is a dual element fuse used for? - ANSWERS-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: - ANSWERS-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. - ANSWERS-40
Decreasing the opening time of the overcurrent protective device will decrease Arc-Flash
hazards. - ANSWERS-true
In a wye connected system, without neutral grounding, zero sequence currents are: - ANSWERS-
zero
When evaluating insulation test results on a medium-voltage, air-magnetic circuit breaker, what
quantity is evaluated? - ANSWERS-watts-loss
, In accordance with NETA and IEEE standards, the correct acceptance test voltage (dc) for 35KV
rated EPR 133% insulation level cable is? - ANSWERS-124kV
Calculate the circuit time constant of an inductor having resistance value of 100 ohms and an
inductance value of 4 Henry: - ANSWERS-0.04 sec
T=L/R
Transformer polarity: - ANSWERS-Is of concern when multiple sets of primary and secondary
windings are interconnected
Identify the least reliable power system arrangement: - ANSWERS-Radial w/ Primary Selectivity
The hot collar bushing test should be performed using which of the following test modes? -
ANSWERS-UST
GST
GST-g
R rated fuses are used for: - ANSWERS-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? - ANSWERS-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? - ANSWERS-1-3 deg C
