NETA 2
What is the NETA recommended maximum maintenance test voltage for a withstand test on 15kV Metal-Clad switchgear.
***27kVAC / 37kVDC
Which of the following ratios is equal to the ratio 8:22?
***4:11
Energy in a capacitor is stored as a(n):
***electrostatic charge
Which is the most common rated insulation for control wiring?
600V
Which of the following would be the best choice for use in both the conductive and mechanical areas of circuit breakers and switches?
Mobil 28
Which instrument is used to locate a 15kV underground cable fault?
Time domain reflectometer
To reverse the direction of rotation of a three-phase motor, reverse:
any two leads
What is the power factor temperature correction value for new mineral oil?
***&20C/40C
What is the turns ratio of a 3-phase 500kVA, 13,200-480 volt rated delta-delta transformer that is 80% loaded?
***&22.000 ***27.500
What is the Restricted Approach Boundary for a 69kV system?
***&3 ft 10 in.
An induction motor has 40kVA input power, a power factor of 82 percent, and an efficiency of 92 percent. What is the horsepower?
***&30.2 HP
Under what considerations can tag out without lock out be permitted?
***&If an energy isolating device is not capable of being locked
When applying personal protective grounds, which end is attached first?
***&The equipment end
When can an unqualified person enter the Limited Approach Space?
***&They are never allowed within the Limited Approach space
Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division:
***0.32
What is the distance between points (3, 5) and (4, 5) on the rectangular coordinate grid?
***1
Evaluate (1/4)^3.
***1/64
Polarization index is defined as the ratio of the measured insulation resistance at what two specific times?
***10 minutes to 1 minute
Using the diagram shown, what is the total circuit resistance?
***10 ohms
What respirator is used when there is insufficient oxygen in a confined space or area, and where the concentration of airborne substances in immediately dangerous to life and health?
***Air purifying
The longest side of the power triangle represents which of the following:
***Apparent Power
Which of the following sets of terminals would you expect to find on a DLRO?
***C1, P1, C2, P2
Hydration is created when a battery cycles. Why is this?
***None of the above
In a three-phase connection, the current that flows in a winding is the _____ current.
***Phase
What color test decal you affix to a protective device that is not suitable for service?
***Red
Underground service conductors between the terminals of service equipment and service lateral or underground service conductors are termed as _____ .
***Service Point Conductors
OSHA requires the testing of a volt meter after a voltage test on voltage above ______.
600V
Which of the following would best describe a 52 device:
AC circuit breaker
The breaking capacity of a circuit breaker is usually expressed in:
Amperes
The main advantage of aluminum bus bar is:
***low cost
Electromotive force is measured in _____.
***volts
How many connection points would you expect to find on a kelvin bridge?
4
For PV systems, a(n) _____ is a device that changes direct-current input to an alternating-current output.
Inverter
Arc flash incident energy is expressed in:
cal&^%$#$%^&^%$#@
ASTM D 924 is a required acceptance test for liquid-filled transformers with natural ester insulating fluid per NETA standards.
***&True
At least 2 entrances of sufficient area must be provided giving access to the electrical equipment working space.
***&True
A given 120VAC 60Hz circuit has a load of 10A with a 20° lagging power factor for 30 minutes. What is the true power?
****310.58 Watts ***1127.63 Watts
Three inductors of 60mH, 120mH and 75mH respectively, are connected together in a parallel combination with no mutual inductance between them. Calculate the total inductance of the parallel combination in millihenries.
***26 mH
For a DAR test of a transformer, the reading at 1 minute is divided by a reading at:
***60 seconds
Shown below is a current transformer with the number of turns between taps. What is the calculated voltage for taps X1 to X3 when 200 V is applied to the full secondary winding (X1 to X5)?
***60V
What is the NETA-ATS recommended test voltage for a 15 minute withstand test on a 3-phase, 34.5kV line sectionalizer with a rated impulse withstand voltage of 150kV?
***78kVAC
In a purely inductive circuit, the phase angle between the voltage waveform and current waveform will have a _____ phase shift.
***90 degrees
The grounded conductor is one of the two conductors through which normal circuit current flows.
***False
The henry is a unit of measurement of:
***Inductance
What does the I represent on a circuit breaker which has a solid state LSIG trip device?
***Instantaneous
When the thermal memory is switched on for digital overcurrent protective devices (OCPDs) used on low-voltage circuit breakers, what effect will it have on the long time delay (LTD) operating time?
***It will decrease LTD somewhat.
Identify the electrical symbol shown:
***Transformer
A confined space with an oxygen level between 19.5% and 23.5% is considered a "hazardous atmosphere."
***True
According to NFPA 70E, all circuits must be analyzed for safety.
***True
Each switchboard used as service equipment should be provided with a main bonding jumper.
***True
Harmonics increase the risk of fire and electric shock.
***True
Shielded cables and twisted pairs are used more frequently in communication circuits to reduce mutual coupling.
***True
The NEC requires Arc-Flash warning labels on all equipment that may be worked on while energized.
***True
What is meant by a "dead tank breaker?"
The external tank is grounded.
A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 ohms in each phase. How much is the primary line current?
2.77 A
A 4160V circuit is equipped with 200/5 CTs, at full scale what should the panel ammeter read if the circuit was operating with a power factor of 0.8%?
200A
A wye-delta transformer has a primary line voltage of 7200 V and a secondary voltage of 360 V. What is the turns ratio?
20:1)()()()()()()(
A series circuit has two resistors. The resistors dissipate 10 W and 15 W. What is the total power dissipation of the circuit?
25 W
A tagout device must be strong enough to remain attached under a minimum of ____ lbs of force.
50
Which portion of the transmission system experiences faults occur most frequently?
Overhead lines
Circuit breakers that stay in service for years without operating:
Tend to have much lower insulation power factors
A piece of wire that is 0.001 inches in diameter and 12 inches long is one mil-foot.
True
The sum of the voltage drops around a series circuit is _____?
Equal to the applied voltage
Power Factor equals?
***Watts / VA
NETA-ATS requires test decals be affixed on the exterior of equipment or equipment enclosure of protective devices after performing electrical tests. Which color test decal would you affix to a piece of equipment with a minor deficiency that does not affect its fault detection or operation?
Yellow
A given transformer has insulating fluid with a specific gravity greater than 1, from where would you draw a sample?
top
What is the insulation level of a cable marked MV-90/175mils?
100%
Which surge arrester rating would be adequate for a 13.8kV ungrounded system?
18kV / 15.3kV MCOV
The accuracy rating of a specific analog ammeter is +/- 1% of full scale. A measurement is taken at 25% of full scale. The accuracy of this measurement is +/-
2.5%
You arrive at a job to perform acceptance testing on a new-indoor 15KV switch lineup. While the equipment has been installed multiple covers are off there are power conductors hanging with taped ends. What should you do?
***&Visually confirm that the source of power have already been de-energized and lock out
When measuring voltage with a multirange voltmeter, which one of the following ranges should be applied first?
***0-1000 V
Write three thousand fortyeight tenthousandths in decimal form.
***0.3048
What is the recommended minimum insulation-resistance value for motor windings made before 1970?
***100 Megohms per kV + 1
Medium-voltage cable, in accordance with NEC Article 328, is defined as single or multiconductor solid dielectric insulated cable rated at ____ volts or higher for use on power systems rated up to 35kV.
***1001
What is the minimum oxygen level before entering a transformer?
***11.5%
A 120VDC circuit measures a current of 0.83 amperes, how many watts are in this circuit?
***145
Employers must keep all canceled confined space entry permits for at least _____.
***18 months
An electrical hazard/risk analysis only looks at the hazards involved with performing energized work.
***False
In an inductive circuit, the voltage waveform lags behind the current waveform.
***False
What can change the voltage output of an energized transformer?
***Load-tap-changer
The first step in circuit breaker operation should be to find and read the _______.
***Manufacturers instructions
Liquid samples that were drawn when the liquid was below 32 degrees F:
***May not reveal free water
In a zone-interlocked low voltage circuit breaker protection scheme, the trip unit responsible for clearing the fault is inoperative. Which statement is true?
***The downstream circuit breaker will trip
To make a resistance measurement, start with the ohmmeter set on:
***The lowest scale
The dataplate on a condenser bushing shows values for C2. What do these represent?
***The power factor and capacitance that should be measured between the tap and the ground flange
What is the primary purpose of the National Electrical Code?
***The practical safeguarding of persons and property from electrical hazards.
Only qualified workers are allowed within the Limited Approach Boundary.
***True ***False
What types of loads cause harmonic distortion?
***VFD
Cells are connected in series to increase:
***Voltage rating
Class 00 rubber insulating gloves are proof tested at 2,500 VAC, what color label would you expect to find on these gloves?
***White
A digital multimeter, when set to read voltage, has an input impedance of
***a fixed, high impedance regardless of range
The three-phase connection in which one end of each of the windings are connected together is called the _____ connection.
***delta
The ________ section of a switchboard receives power from the service section and feeds it to various downstream loads.
***distribution
A downstream 30A fuse will always blow before an upstream 100A fuse.
***false
The smallest particle of a substance where it still retains it's properties is a/an______.
***molecule
In the picture below, would rated ear muffs be adequate hearing protection?
***no
Sample valves should be flushed with at least _____ of waste liquid before collecting a transformer liquid sample.
***one quart
Which of the following is not a factor in the operating speed of a relay?
***rate of flux build up
Identify the contact pictured above. (NC and NO separated by a node)
Form C
If you have your ground conductor running through your zero-sequence CT with your current carrying conductors, what will happen?
Ground fault protection won't function
