Page 1 of 39
NETA III EXAM PRACTICE QUESTIONS WITH
VERIFIED SOLUTIONS NEW MODIFIED EXAM
LATEST UPDATE
Panelboards equipped with snap switches of rating 30 amps or less shall be
provided with over-current protection of not more than _____ . --CORRECT
ANSWER--200 amps
Underground service conductors between the terminals of service equipment
and service lateral or underground service conductors are termed as _____ . --
CORRECT ANSWER--Service Entrance Conductors
What is a dual element fuse used for? --CORRECT ANSWER--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: --CORRECT ANSWER--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. --CORRECT ANSWER--40
Decreasing the opening time of the overcurrent protective device will decrease
Arc-Flash hazards. --CORRECT ANSWER--true
, Page 2 of 39
In a wye connected system, without neutral grounding, zero sequence currents
are: --CORRECT ANSWER--zero
When evaluating insulation test results on a medium-voltage, air-magnetic
circuit breaker, what quantity is evaluated? --CORRECT ANSWER--watts-loss
In accordance with NETA and IEEE standards, the correct acceptance test
voltage (dc) for 35KV rated EPR 133% insulation level cable is? --CORRECT
ANSWER--124kV
Calculate the circuit time constant of an inductor having resistance value of 100
ohms and an inductance value of 4 Henry: --CORRECT ANSWER--0.04 sec
T=L/R
Transformer polarity: --CORRECT ANSWER--Is of concern when multiple
sets of primary and secondary windings are interconnected
Identify the least reliable power system arrangement: --CORRECT ANSWER--
Radial w/ Primary Selectivity
The hot collar bushing test should be performed using which of the following
test modes? --CORRECT ANSWER--UST
GST
, Page 3 of 39
GST-g
R rated fuses are used for: --CORRECT ANSWER--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.
The alternate source for emergency systems are required to be equipped with
ground-fault protection of equipment. --CORRECT ANSWER--False
Which ANSI/IEEE standard covers SF6 circuit breakers? --CORRECT
ANSWER--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? --CORRECT ANSWER--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. --CORRECT ANSWER--4
, Page 4 of 39
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. --CORRECT
ANSWER--2
A DC shunt motor should never be operated: --CORRECT ANSWER--with the
field circuit open
What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? --
CORRECT ANSWER--20
The generally accepted limits of deviation from the nominal 60Hz utility power
frequency is: --CORRECT ANSWER--.50Hz
Power Factor testing is least effective on which of the following? --CORRECT
ANSWER--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? --CORRECT ANSWER--ASTM D1298
NETA III EXAM PRACTICE QUESTIONS WITH
VERIFIED SOLUTIONS NEW MODIFIED EXAM
LATEST UPDATE
Panelboards equipped with snap switches of rating 30 amps or less shall be
provided with over-current protection of not more than _____ . --CORRECT
ANSWER--200 amps
Underground service conductors between the terminals of service equipment
and service lateral or underground service conductors are termed as _____ . --
CORRECT ANSWER--Service Entrance Conductors
What is a dual element fuse used for? --CORRECT ANSWER--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: --CORRECT ANSWER--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. --CORRECT ANSWER--40
Decreasing the opening time of the overcurrent protective device will decrease
Arc-Flash hazards. --CORRECT ANSWER--true
, Page 2 of 39
In a wye connected system, without neutral grounding, zero sequence currents
are: --CORRECT ANSWER--zero
When evaluating insulation test results on a medium-voltage, air-magnetic
circuit breaker, what quantity is evaluated? --CORRECT ANSWER--watts-loss
In accordance with NETA and IEEE standards, the correct acceptance test
voltage (dc) for 35KV rated EPR 133% insulation level cable is? --CORRECT
ANSWER--124kV
Calculate the circuit time constant of an inductor having resistance value of 100
ohms and an inductance value of 4 Henry: --CORRECT ANSWER--0.04 sec
T=L/R
Transformer polarity: --CORRECT ANSWER--Is of concern when multiple
sets of primary and secondary windings are interconnected
Identify the least reliable power system arrangement: --CORRECT ANSWER--
Radial w/ Primary Selectivity
The hot collar bushing test should be performed using which of the following
test modes? --CORRECT ANSWER--UST
GST
, Page 3 of 39
GST-g
R rated fuses are used for: --CORRECT ANSWER--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.
The alternate source for emergency systems are required to be equipped with
ground-fault protection of equipment. --CORRECT ANSWER--False
Which ANSI/IEEE standard covers SF6 circuit breakers? --CORRECT
ANSWER--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? --CORRECT ANSWER--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. --CORRECT ANSWER--4
, Page 4 of 39
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. --CORRECT
ANSWER--2
A DC shunt motor should never be operated: --CORRECT ANSWER--with the
field circuit open
What is the expected torque (pound-feet) value of a 3/8" Grade 5 bolt? --
CORRECT ANSWER--20
The generally accepted limits of deviation from the nominal 60Hz utility power
frequency is: --CORRECT ANSWER--.50Hz
Power Factor testing is least effective on which of the following? --CORRECT
ANSWER--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? --CORRECT ANSWER--ASTM D1298
