NETA LEVEL II EXAM QUESTIONS CORRECTLY ANSWERED 2024.
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Module
NETA LEVEL II
Institution
NETA LEVEL II
NETA LEVEL II EXAM QUESTIONS CORRECTLY ANSWERED 2024.
What is the preferred method of performing primary-injection testing on a low voltage circuit breaker with ground fault protection?
Use of the manufacturer's test kit or rewiring the neutral CT input is the preferred method of primary-inje...
NETA LEVEL II EXAM QUESTIONS CORRECTLY
ANSWERED 2024.
What is the preferred method of performing primary-injection testing on a low
voltage circuit breaker with ground fault protection?
Use of the manufacturer's test kit or rewiring the neutral CT input is the preferred
method of primary-injection testing on a low voltage circuit breaker with ground fault
protection, otherwise two poles can be connected in series to provide balanced
secondary currents to the trip unit.
At what current level does ventricular fibrillation occur?
-60 to 100mA in AC systems
-300 to 500mA in DC systems
What is the LET-GO current threshold?
For a 70kg body
75mA DC
15mA AC
Meter Sockets and meter disconnect switches should be connected on the load
side of a service disconnecting means.
FALSE
(NEC Article 230.82)
Which standard addresses equipment grounding?
NFPA 70 (National Electric Code)
A moving iron meter operates by applying _____ current to the coil.
Operating current ( can be AC or DC)
What is the maximum deviation between resistance measurements on bolted
connections?
,50% of the lowest value
(MTS 7.20.3.1)
Removable / Drawout circuit breaker Normally 5kV or above
Identify the electrical symbol shown:
Resistance grounding is used for voltages:
6.6kV and greater
Medium-voltage motor starters use blowout coils. What do these do?
Blowout coils may be used to extinguish the arc by means of a magnetic blast. The arc
created when the contacts open is subjected to the action of a magnetic field set up by
coils connected in series with the circuit being interrupted.
These coils are called blowout coils because they help blow out the arc magnetically.
The arc is magnetically blown into arc chutes where the arc is lengthened, cooled, and
extinguished.
Medium voltage air circuit breakers use PUFFER TUBES. What do these do?
Puffer tubes incorporate the operating mechanism to blow a puff of air through a tube
and nozzle to each contact assembly when the breaker is opened. The air helps quench
the arc by pushing it up into the arc-chute.
Ammeter
Identify the electrical symbol shown:
SAE grade 1 & 2 Bolt
No lines on head
Tensile strength 64KSI
SAE grade 5 Bolt
3 lines on head
Tensile strength 105 KSI
SAE grade 7 Bolt
5 lines on head
Tensile strength 133 KSI
SAE grade 8 Bolt
6 lines on head
Tensile strength 150 KSI
, NFPA 70B 11.27.3 Decal color code RED
(Non-serviceable) - Device has a problem detrimental to its proper electrical or
mechanical operation such as no trip on one or more phases or high contact resistance
readings. This device should not be placed back into service.
NFPA 70B 11.27.3 Decal color code yellow
(Limited Service) - Device has a minor problem that does not impact equipment
serviceability but should be fixed as soon as possible. Some examples of minor
problems include slightly lower than acceptable insulation resistance readings or
chipped arc chutes.
NFPA 70B 11.27.3 Decal color code white
(Servicable) - Device is electrically and mechanically sound and suitable for service but
may still have minor defects such as slight corrosion or incorrect circuit ID.
What instructions govern the performance of a SHORT CIRCUIT STUDY?
ANSI/IEEE standard 399
Step by step procedures outlined in the short circuit calculation chapters of IEEE
standard 141 and ANSI/IEEE 242.
What instructions govern the performance of a Coordination STUDY?
ANSI/IEEE STANDARD 399
ANSI/IEEE STANDARD 242
NFPA 70 (NATIONAL ELECTRIC CODE) protective devices
Two standards are typically used for the interconnection of smart devices in a
substation environment. One is an IEC standard, the other is an IEEE standard.
What are the two standards?
IEEE C37.1
IEC 61850
Time travel analysis is commonly performed on:
is used on medium and high-voltage circuit breakers and provides information as to
whether the breaker's operating mechanism is operating properly (NFPA 70B).
Which of the following is not a standard dc power source voltage?
1. 24VDC
2. 48VDC
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