NETA III CORE EXAMS SET 2025/2026 QUESTIONS WITH
ANSWERS RATED A+
✔✔a given circuit id 120vac and has a draw of 10 amps, phase is 10 degrees w 45
magnitude, what is the kvar? - ✔✔77.5/78
✔✔what would cause a generator to trip on 32R? - ✔✔voltage higher than utility
✔✔according to the nfpa what is the max allowable time for ground fault to operate -
✔✔1 sec at 1200A
spec is 1 sec at 3000 A
✔✔lagging power factor improves using a sync motor - ✔✔raise excitation of field wiring
✔✔what is an application for a circuit switcher with a pre insertion inductor -
✔✔transient control for cap bank switching
✔✔what 2 types of limited approach boundaries exist on NFPA 70E - ✔✔Exposed
movable conductor, exposed fixed circuit part
✔✔a CT supplies multiple devices. to confirm which devices are connected to it, the
output of a single phase 5A source is connected to the X1 terminal of the CT w/o
removing the existing wiring, the expected current at each currently connected device
would be: - ✔✔4-5a
✔✔coil a is rated for 24vdc, 500ma, and has a resistance of 48 ohms. R1 is sized to
limit the current in the coil to 500ma. if the supply voltage is 125vdc, what is the power
dissipated in R1 - ✔✔50.5W
✔✔during a phase test across a generator tie breaker cell where both sources have the
same rotation, the voltage measure across any one phase increases as the phase
angle: - ✔✔increases between 0 and 90 degrees
✔✔what test is performed on a surge arrestor - ✔✔watts loss
✔✔what is avg temp is the liquid level gauge set to - ✔✔25 C
✔✔which is damaging to insulating materials used in high voltage rotating machines -
✔✔corona
✔✔what is a newer SCADA system that doesnt require cables? - ✔✔PLCC
, ✔✔PI readings are not accurate when a motor meggs more than _____ in a minute -
✔✔5000 Mohms
✔✔one indicaction that a lead acid battery is in trouble is when its internal impedence
increases _____ % between identical cells that are in a fully charged state - ✔✔25
✔✔bucholz relays - ✔✔internal faults/gas pressure
✔✔The motor branch-circuit short-circuit and ground-fault protective device shall be
capable of carrying the_________current of the motor. - ✔✔starting
✔✔recommended insulation resistance value for 15kv dry type transformer - ✔✔25000
m ohms
✔✔min PI generator - ✔✔2 megs
✔✔what does high impedance on a xfmr do? - ✔✔effects the short circuit fault current
✔✔winding-resistance values shall compare within - ✔✔1%
✔✔minimum operating time of buchholz relay - ✔✔0.1 s
✔✔medium voltage motor starters use blowout coils. what do these do? - ✔✔magnetic
field that helps draw the arc into the arc chute
✔✔voltage rate of rise for an ASTM D877 test - ✔✔3kV/s
✔✔least likely to be found on an ATS instillation - ✔✔current balance relay
✔✔which protection element would you expect to preform on a new 32 relay -
✔✔determine tripping zone
✔✔min test limit for an ASTM D1816 (1mm gap) test on mineral oil used in new 230kV
equipment - ✔✔32
✔✔ASTM test method for water content in oil - ✔✔D1533
✔✔Residual voltage of a capacitor should be reduced to ____ or less within 1 min after
disconnect - ✔✔50 volts
✔✔what is the synchronous speed of a 24 ft pole, 60hz alternator - ✔✔300
ANSWERS RATED A+
✔✔a given circuit id 120vac and has a draw of 10 amps, phase is 10 degrees w 45
magnitude, what is the kvar? - ✔✔77.5/78
✔✔what would cause a generator to trip on 32R? - ✔✔voltage higher than utility
✔✔according to the nfpa what is the max allowable time for ground fault to operate -
✔✔1 sec at 1200A
spec is 1 sec at 3000 A
✔✔lagging power factor improves using a sync motor - ✔✔raise excitation of field wiring
✔✔what is an application for a circuit switcher with a pre insertion inductor -
✔✔transient control for cap bank switching
✔✔what 2 types of limited approach boundaries exist on NFPA 70E - ✔✔Exposed
movable conductor, exposed fixed circuit part
✔✔a CT supplies multiple devices. to confirm which devices are connected to it, the
output of a single phase 5A source is connected to the X1 terminal of the CT w/o
removing the existing wiring, the expected current at each currently connected device
would be: - ✔✔4-5a
✔✔coil a is rated for 24vdc, 500ma, and has a resistance of 48 ohms. R1 is sized to
limit the current in the coil to 500ma. if the supply voltage is 125vdc, what is the power
dissipated in R1 - ✔✔50.5W
✔✔during a phase test across a generator tie breaker cell where both sources have the
same rotation, the voltage measure across any one phase increases as the phase
angle: - ✔✔increases between 0 and 90 degrees
✔✔what test is performed on a surge arrestor - ✔✔watts loss
✔✔what is avg temp is the liquid level gauge set to - ✔✔25 C
✔✔which is damaging to insulating materials used in high voltage rotating machines -
✔✔corona
✔✔what is a newer SCADA system that doesnt require cables? - ✔✔PLCC
, ✔✔PI readings are not accurate when a motor meggs more than _____ in a minute -
✔✔5000 Mohms
✔✔one indicaction that a lead acid battery is in trouble is when its internal impedence
increases _____ % between identical cells that are in a fully charged state - ✔✔25
✔✔bucholz relays - ✔✔internal faults/gas pressure
✔✔The motor branch-circuit short-circuit and ground-fault protective device shall be
capable of carrying the_________current of the motor. - ✔✔starting
✔✔recommended insulation resistance value for 15kv dry type transformer - ✔✔25000
m ohms
✔✔min PI generator - ✔✔2 megs
✔✔what does high impedance on a xfmr do? - ✔✔effects the short circuit fault current
✔✔winding-resistance values shall compare within - ✔✔1%
✔✔minimum operating time of buchholz relay - ✔✔0.1 s
✔✔medium voltage motor starters use blowout coils. what do these do? - ✔✔magnetic
field that helps draw the arc into the arc chute
✔✔voltage rate of rise for an ASTM D877 test - ✔✔3kV/s
✔✔least likely to be found on an ATS instillation - ✔✔current balance relay
✔✔which protection element would you expect to preform on a new 32 relay -
✔✔determine tripping zone
✔✔min test limit for an ASTM D1816 (1mm gap) test on mineral oil used in new 230kV
equipment - ✔✔32
✔✔ASTM test method for water content in oil - ✔✔D1533
✔✔Residual voltage of a capacitor should be reduced to ____ or less within 1 min after
disconnect - ✔✔50 volts
✔✔what is the synchronous speed of a 24 ft pole, 60hz alternator - ✔✔300
