NETA 3 Exam 1 Questions with Correct
Answers
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
Answers
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
