NETA 2 Combined study guide
Over your right shoulder
Facing the low-voltage side of a three phase transformer, where is H3?
synchronous
In a three-phase motor, the speed of rotation of the magnetic field is called the _____ speed.
at least one
How many persons on the confined space rescue team or service must hold a current certification in CPR?
343 lb-ft equation=Torque = HP x 5252 / RPM
How much torque is required to produce 300 HP at 4600 RPM?
voltmeter or phasing sticks
In addition to the proper PPE, what is the minimum equipment required to verify phasing on a 480V double-ended substation with drawout circuit breakers?
5
Type AC Cable must have a bending radius at least _____ times the diameter of the cable.
Occupational Safety and Health Administration
Who is the main federal agency charged with the enforcement of safety and health legislation?
8
six lines on a bolt head in the shape of a hexagon is a grade __ bolt
battery
what does this schematic symbol represent
Undercurrent/Underpower Relay
what is a 37 device
Manual Transfer Switch
what is a 43 device
Unbalance Relay
what is a 46 device
Instantaneous Overcurrent Relay
what is a 50 device
AC Time Overcurrent Relay
what is a 51 device
AC Circuit Breaker
what is a 52 device
Power Factor Relay
what is a 55 device
decrease
What happens to the inductance of an inductor as its core becomes saturated? Does the inductance value increase, decrease, or remain the same?
equation for total uF in series= 1 /( 1/12+1/20+1/30)=6 equation for Xc= 1 / (2(pi) * 400 * .000006) answer=66.32 ohms
Three capacitors, a 12 µF, a 20 µF, and a 30 µF, are connected in series to a 400 Hz source. The total XC is
53.05 ohms 1/(2*3.14*60*.00005)
Two capacitors, a 20 µF and a 30 µF, are connected in parallel to a 60 Hz source. The total capacitive reactance is
40kv
What is the NETA-MTS recommended maximum AC test voltage for a high-potential test on a single-phase, 27kV line sectionalizer with a rated impulse withstand voltage of 125kV?
650 equation=MVA = SC x (Max Voltage x 1.732) / 1,000,000
What is the calculated MVA rating for a 15kV Vacuum circuit breaker operating at 13.8kV with an interrupting rating of 1600A and a short circuit rating of 25kA?
10kV
What rms test voltage would you use to perform a VLF test on service aged cable rated 8kV according to NETA standards?
false
A single transfer switch may be used where a single generator supplies emergency loads and other loads.
feeders
Conductors between the service equipment or source of separately derived systems and a panelboard are defined as ____ .
100-2000mA
Considering a general 120V 60Hz hand-to-foot shock of one second, at approximately which current level would ventricular fibrillation occur?
Change current flow
What is the function of a circuit breaker?
Any value greater than 1.0
What is the minimum acceptable DAR value for a newly installed 150kW emergency generator?
47
What protective relay functions on a predetermined value of polyphase voltage in the desired phase sequence?
Velocity and displacement
What two quantities are usually measured with a circuit breaker motion analyzer?
TRUE
Capacitance is directly proportional to the area of the plates.
105A
A 4-20mA single CT has a max range of 150 amp what is the amps at 14mA?
Category 2
A given battery bank feeding a 208V UPS system has an available fault current of 1600A and an arc duration of 1.5 seconds. According to NFPA 70E, which of the following would be considered an acceptable Arc-Flash PPE Category for this equipment?
17.32 A
A delta-connected set of windings has a phase current of 10 A. The line current is
OFWF First Letter: Internal cooling medium in contact with the windings O: Mineral oil or synthetic insulating liquid with fire point < 300°C K: Insulating liquid with fire point > 300°C L: Insulating liquid with no measurable fire point Second Letter: Circulation mechanism for internal cooling medium N: Natural convection flow through cooling equipment and windings F: Forced circulation through cooling equipment (cooling pumps), natural convection flow in windings (non-direct flow) D: Forced circulation through cooling equipment, directed from the cooling equipment into at least the main windings Third Letter: External cooling medium A: Air W: Water Fourth Letter: Mechanism for external cooling medium N: Natural convection F: Forced convection
A modern oil-filled transformer is cooled by an oil/water heat exchanger mounted separately from the tank. What classification might this transformer have?
Proper chemical material mixing procedures
An MSDS is a document will normally not contain which of the following information?
Liquid transformers
Buchholz relays are used to protect:
7
Five lines on a bolt head in the shape of a pentagon is a grade __ bolt
100mW
For high-voltage bushings without a capacitance tap, at what level would a hot collar watt-loss test indicate possible contamination?
First-trip testing
From a safety perspective, which of the following tests is most important when servicing medium-voltage circuit breakers?
current
Galvanometers are used to measure what
1926.100
OSHA guidelines for head protection are referenced in:
two quarts
Sample valves should be flushed with at least _____ of waste liquid before collecting a transformer liquid sample.
Device/circuit operation
Schematic diagrams are principally utilized to show
good speed regulation
The shunt-type DC motor is known to have:
Apparent Power
The longest side of the power triangle represents which of the following:
class
The maximum intended AC voltage use of insulating blankets is identified by its ________ designation.
Faradays Law
Transformers work on which of the following principles:
primary
Voltage taps are usually located on the ____ side of a transformer.
Ground, Guard & UST
What are the three modes of operation using a power factor test set?
Hi-pot
What can be used to test a the integrity of vacuum bottles?
white
What color test decal you affix to a protective device that is electrically and mechanically acceptable?
21
What device functions when the circuit admittance, impedance or reactance increases or decreases beyond predetermined limits?
North American Electric Reliability Corporation
What does NERC stand for?
energy use
What does a kilowatt-hour meter read?
Whether there are defects in the cable that will fail under test conditions
What does a withstand test determine
300% overload
When testing an MCP what tests are not performed?
the metal end caps of ferrule fuses and the blades on knife-blade fuses.
When testing fuses, whether by resistance measurement or voltage measurement, the test probes should contact______________ or _______________.
1/3 way down side of cell
When using a hydrometer, where is the specific gravity of a cell taken?
Class 2
Which of the following hard hats would you choose to protect from blows to both the top and sides of the head?
Type 2
Which of the following hard hats would you choose to protect from blows to both the top and sides of the head?
500vdc
Which potential would you apply when performing an insulation resistance acceptance test on 300V rated cable?
47 DEVICE
Which protective relay functions on a predetermined value of polyphase voltage in the desired phase sequence?
Translay relay
Which relay is used to protect feeders?
1 or 2
the absence of lines on a bolt head is a grade __ bolt
5
three lines on a bolt head in the shape of a triangle is a grade __ bolt
relatively constant speed under varying loads
DC compound motors are used to operate loads that require:
Overvoltage Relay
what is a 59 device
AC Directional Overcurrent Relay
what is a 67 device
DC Circuit Breaker
what is a 72 device
AC Reclosing Relay
what is a 79 device
Automatic Transfer Relay
what is a 83 device
40 equation=15 +15+(1/(1/20+1/20))
what is the resistance from a to b
