NETA 3 Questions 3
What is the minimum acceptable dielectric breakdown value for service-aged FR3 insulating liquid tested in accordance with ASTM D1816 using a 1mm gap? KV
34
What is the NETA-MTS recommended maximum AC test voltage for hipot testing single-phase 15kV automatic circuit reclosers with a rated impulse withstand voltage of 110kV? _____kV
37.5
Motor overload protection is shunted or cut out in the starting position if fuses or inverse time circuit breakers rated not over _____ of the full-load current of the motor are located in the circuit so as to be operative during the starting period of the motor. %
400
What would be a suitable test voltage for a watt-loss test on a silicon carbide surge arrester rated 6kV? _____ kV
5
What is the maximum acceptable limit for an ASTM D1533 test on silicone insulating liquid in new transformers? _____ppm
50
What is the recommended insulation resistance value for a 15kV liquid filled transformer? _____M
5000
What size neutral resistor would be required to limit the fault current of a 13,800-480Y/277V 1500kVA Transformer to 5A?
55.4
What is the Limited Approach Boundary for a 35kV switchgear? ______ ft
6
Overcurrent protection shall not be required for conductors from a battery rated less than ____ volts if the battery is provided for starting a prime mover.
60
Electrical systems covered in NEC Article ____ don't protect people - they protect against financial loss.
702
Grounding electrodes should be installed with at least _____ feet of length in contact with soil.
8
Pickup of a standard, electromechanical induction disk relay (such as an IAC-51 or CO-8) is set by:
Adjusting the spiral spring tension
What is the minimum acceptable DAR value for a newly installed 150kW emergency generator?
Any number greater than 1.0
What can you do to create a negative sequence when testing a 47 relay?
Apply 3 phase voltage in reverse direction
Speed of a DC motor is inversely proportional to -
Armature voltage drop
Wiring diagrams are principally utilized to show
Control device connections
Which of the following tests is the most suitable and accurate method for determining the moisture content of power transformer insulation?
DFR
What happens to the inductance of an inductor as its core becomes saturated? Does the inductance value increase, decrease, or remain the same?
Decrease
Which variable is the most critical in accurately measuring target surface temperature with a radiometer?
Emissivity
Which of the following maintenance tests is required for a 13200-480Y/277V 2500kVA dry-type transformer?
Excitation on each phase
True/false Storage batteries for emergency lighting must maintain 85% of charge for 90 minutes.
False
Conductors between the service equipment or source of separately derived systems and a panelboard are defined as ____ .
Feeders
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
Which of the following would you expect to find on a test set used to measure insulation resistance?
Guard, line, earth
Which of the following technologies would be least useful in helping to mitigate capacitor inrush transients?
High-pass conditiners
Which of the following is not a standard relating to power quality analysis:
IEEE 599
Which types of transducers can be used to measure displacement or motion?
LVDTs, piezoelectric and variable eesistance
When analyzing a non-sinusoidal waveform, it is often important to know the ____ of the harmonic components present.
Magnitude and phase angle
The presence of a Run Speed or RPM spike in a Demodulation Spectrum is a result of
Misalignment or imbalance
Overcurrent protection in case of service equipment protects against:
Overloads
A ________ is used when cables fed from the bottom of a switchboard need to be routed to the top of the switchboard
Pull section
A(n) ____ disconnecting means is required within sight of the storage battery for all ungrounded stationary battery system conductors operating at over 60VDC.
Readily accessible
New installation of 350 MCM copper 15kV tape shielded 100% EPR insulated power cable requires inline splice. To properly perform a splice on this cable which is not required:
Some type of conductors are required to cross splice and connect the shield on both sides
When analyzing a ground test report, which of the following would most likely affect the results?
Spacing of the probes
Before performing ground fault test on a 480V main switchboard you measure less than 1 megohm between the neutral and ground bus. Which of the following statements is true?
The reading is low and should be improved before testing the ground fault protection.
What is the main reason to use shunt reactors in power lines?
To stabilize system voltage
True or False PCB-Contaminated Transformers containing between 50 and 499 ppm PCBs are subject to EPA regulations.
True
True or false: A 10kV surge arrester with a MCOV rating of 8,400V is suitable for a 13.8kV solidly grounded system.
True
True or false: A branch-circuit overcurrent device can serve as the disconnecting means for a stationary motor of 1/8 hp or less.
True
True/false The base speed listed on a DC motor's nameplate is an indication of how fast the motor will run with rated armature voltage and rated load amps at rated field current.
True
The _____ of an insulating liquid refers to its internal resistance to flow.
Viscosity
In an RC parallel circuit, the current through the resistor and the current through the capacitor are
less than 90° out of phase with the resistor current lagging
ab with angle n
|a| × |b| × cosΘn
ab with right angle vector n
|a| × |b| × sin(Θ) × n
The power factor of new mineral oil at 100C for 230kV rated equipment should be _____ % or less
.3
In a typical stepped distance protection scheme, Zone 4 is commonly set with a time delay of ____.
.75-1 second
A current limiting protective device will cut off the maximum peak fault current for currents within its current limiting range is less than which of the following: ________cycles
0.5
What is the accepted value for a PI test on an emergency generator during maintenance testing?
1
What is the maximum acceptable dissipation factor value at 25°C for service-aged FR3 insulating liquid tested in accordance with ASTM D924?____%
1
What is the voltage rating on a Nickel-based battery? ____V
1.2
What is the minimum acceptable temperature corrected insulation resistance value for a common 5kV emergency generator with form-wound coils manufactured in 1989? ______megohms
100
What is the recommended maximum acceptance test voltage for a DC overpotential test on a 35 kV cable with 100% insulation level? ______kV
100
What size overload would you most likely use for a 3-phase 480V 100HP induction motor with a FLC of 124A? ____A
140
Non time delay fuses for the protection of wound rotors shall have maximum rating of:______%
150
he full-load current for a single-phase alternating current 115 volt, 1 horsepower motor is which of the following: _____A
16
A 70 sqmm copper cable can withstand a short circuit current of 8.05kA for 1 second. If the protection relay operates in 0.2 second, then what is the maximum fault current that the cable can tolerate? _____kA
18
Which surge arrester rating would be adequate for a 13.8kV ungrounded system?
18kV / 15.3kV MCOV
A given 4160V 3-phase wye connected system is grounded by a 12 ohm resistor, what would the ground fault current be limited to? _____A
200
A three-phase 480-208Y/120V transformer rated 750kVA with an impedance of 4.6% is to be protected by a circuit breaker on the primary side with fuse protection on the secondary side. What is the maximum standard trip setting that should be used for this breaker? Amps
2500
What is the NETA recommended maximum maintenance test voltage for a withstand test on 15kV Metal-Clad switchgear.
27AC/37.5kvDC
What is the voltage rate of rise for an ASTM D877 test? _____ kV
3
What is the voltage rating on a lithium ion battery? _____V
3.6
