NETA Level 2 Study Material

Write three thousand fortyeight tenthousandths in decimal form.

0.3048

How many attendants are required while entering a confined space?

1

A delta connected set of windings has a phase voltage of 100 V. The line voltage is

100V

A wye-delta transformer has a primary line voltage of 7200 V and a secondary voltage of 360 V. What is the turns ratio?

11.55:1, Vp/sqrt(3)/Vs

What is the Restricted Approach Boundary for a 480V system?

12 inches

A given 120VAC 60Hz circuit has a load of 10A with a 20° lagging power factor for 30 minutes. What is the apparent power?

1200.00VA, S=IE

A delta-connected set of windings has a phase current of 10 A. The line current is

17.32, 10A times 1.732

In a circuit containing a capacitor, the impressed voltage is _____ with the applied voltage.

180 degrees

Which of the following is LEAST likely to contain a blown fuse trip device?

200 amp fused safety switch

Type MV is a single dielectric insulated cable rated _____ volts or higher.

2001

When testing an MCP what tests are not performed?

300% Overload

When a grounding electrode conductor or bonding jumper is connected to a concrete-encased electrode (does not extend on to other types of electrodes that require a larger size of conductor), the grounding electrode conductor is not required to be larger than _____ copper wire.

4AWG

What is the Limited Approach Boundary for a 13.2kV switchgear?

5 feet

OSHA requires the testing of a volt meter after a voltage test on voltage above ______.

600V

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

66.32, Xc = 1/(2*pi*f*C)

What rms test voltage would you use to perform a VLF test on service aged cable rated 5kV according to NETA standards?

7kV

Triangle NAB is as shown. If: AN = BN = 100 and BD = AD and N = 120°, then length BD is:

86.7

In high impedance grounding systems, the grounding conductor shall not be smaller than ___ copper and ____ aluminum

8AWG and 6 AWG

Which of the following is not a standard dc power source voltage?

96

Inductance of a coil is determined by which of the following physical properties?

A and C

Which of the following would best describe a transformer?

A device that changes voltage and current levels

During an inspection of a 1500KVA liquid filled transformer one of the gauges reads slightly above 25 degrees Celsius mark. Based on your knowledge of such a gauge which of the following is true?

A gauge reading of slightly above 25 degrees Celsius mark could refer to either the level gauge or temperature gauge

Which component is being measured in the test diagram above?

A phase

Which of the following should be achieved with adequate ventilation:

A,B, and C

Upon the outbreak of a fire, your first action should be to:

Alert or alarm

Before personnel are allowed to operate a power circuit breaker they must first understand the ________ of the breaker.

All the above

Name the hazard involved with placing an electrical system in an electrically-safe work condition

All the above

Temporary safety grounds:

Are sized with consideration of available short circuit current and time duration

The safety goggles or glasses suitable for electrical work should:

Be non-conductive

Voltage detectors must:

Be rated for the system and voltage being tested

What does CPR stand for?

Cardiopulmonary Resuscitation

Protection against extremely high fault current is typically achieved by use of:

Current Limiting Fuses

A wattmeter measures:

Current magnitude times voltage magnitude times % power factor

Which of the following would NOT be part of the test plan for a 50 device?

Determine time delay at two points on the time current curve

Capacitance is inversely proportional to which of the following?

Distance between the plates

The sum of the voltage drops around a series circuit is _____?

Equal to the applied voltage

Once placed into service, how often must rubber gloves must be cleaned, inspected and electrically tested?

Every 6 months

All power tools are required to be grounded through an additional grounding conductor in the cord and the grounding prong of the attachment plug.

False

Retrieving oil samples from the transformer sampling cock is the preferred method because it offers the most convenience and least contamination.

False

Which device might be used with all of the following equipment; molded-case circuit breakers, low-voltage air circuit breakers, medium-voltage switches, and potential transformers?

Fuse

Arcing occurs when a load is switched off because the circuit has:

High Inductance

Which of the following technologies would be least useful in helping to mitigate capacitor inrush transients?

High-pass conditioners

The state of charge of a lead acid battery is measured by which of the following:

Hydrometer

On a 87 diff relay, the tap screw was found to be loose but tripped. What would cause it to be come loose?

Inadequate maintenance

Harmonics will _____ the resistance of a conductor.

Increase

Identify the electrical symbol shown:

Inductor

What is the kVA rating of a 3-phase generator rated at 100kW with a 0.9 power factor?

KVA = W/(1000*PF)

In a three-phase connection, the current that flows in an externally connected voltage conductor is the _____ current.

Line

The breaking capacity of a circuit breaker is usually expressed in:

MVA

What is the most common cause of failure of electrical equipment in service?

Moisture

Identify the equipment shown in the picture above

NWP - Used to protect multiple transformers in parallel

What does NERC stand for?

North American Electric Reliability Corporation

ower transformer cooling classes went through major changes in the United States when IEEE Standard C57.12.00-2000 adopted the modern four-letter designation. Which of the following old designations does not match the new?

OA/FOA=ONAN/ONAF

A current limiting fuse:

Opens circuits in less that 1/4 cycle when certain current magnitudes are reached

Which portion of the transmission system experiences faults occur most frequently?

Overhead cables

The arcing contacts on a circuit breaker are used to:

Prevent damage to the main contacts

The type of bridging impedance most commonly used on a load tap changer is the:

Preventative Autotransformer

An electrical system where each transformer can be supplied from either of two sources is called a:

Primary Selective System

Which of the following is not a typical distribution system?

Secondary Loop

Which type of electromechanical relay is commonly used for time delay functions?

Shaded Pole

Insulation resistance must be corrected for?

Temperature

What one step could a technician in the field take to reduce the possibility of electrical accidents?

Test for the absence of voltage

Which of the following would best describe the relation between voltage and current for an ac circuit containing resistance and capacitive reactance?

The current leads the voltage

In a power system study, the purpose of a TCC is to show:

Time coordinating curves

For which reason does a Kelvin Bridge have 4 leads?

To eliminate extra impedance

A dashpot is used:

To provide time delays

The invention of the ____ made long distance transmission lines practical.

Transformer

Non load break cable connectors may be used as a disconnecting means in an emergency situation.

True

The equipment manufacturer should be contacted for recommendations before applying dc withstand maintenance tests to metal-enclosed interrupter switchgear rated above 15kV.

True

The grounded conductor is one of the two conductors through which normal circuit current flows.

True

Transformer secondary circuits having voltage levels less than 50V are not required to be grounded if the supply side of the transformer is grounded.

True

For HV bushing power factor measurements, the C1 test is conducted using the _____ test mode.

UST

Electromotive force is measured in _____.

Volts

When can an unqualified person enter the Limited Approach Space?

When continuously escorted

Line current and phase current are the same in the _____ configuration.

Wye

Branch-circuit overcurrent devices in emergency circuits shall be accessible to ______ only.

authorized persons

What are the three most common states for network protectors?

automatic, closed, open

The _______ in a series circuit will be equal across each resistor in the circuit.

current

Contactor coils are present in manual motor starters:

false

Even though operating and time characteristics vary between different fuse types and constructions, fuses are intended to operate at their ampere rating.

false

Multiphase delta-delta, 3-wire transformer secondary conductors are not considered to be protected by the transformer primary overcurrent protective device.

false

The grounding conductor is one of the two conductors through which normal circuit current flows.

false

The wound-rotor induction motor is popular in industry because it has _____ starting torque and _____ starting current.

high, low

A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a:

logic analyzer

Dual-element fuses have a _____ resistance than ordinary fuses.

lower

What is the approximate sum of the following two vectors? Magnitude 5 at 0° and magnitude 10 at 180°.

magnitude 5 at 180 degrees

ASTM test method D974 measures which of the following?

mg KOH/g

Thermal relays are often used in:

motor starters

In three-phase power systems, the delivered power

never falls to zero

You examine a test instrument commonly used to measure insulation resistance on equipment rated 600V or lower. The output of the test instrument is 1000 volts and the lead connections are?

none of the above

Which of the following is least important when choosing the class of surge arrester to be applied on a system:

operating environment of arrester

Why it is required to drain off the stored charge in a capacitor after the supply circuit has been opened.

personnel safety

Using the diagram above, identify a point that would not be energized if voltage was applied to the line bus.

point 12

Piezoelectricity is caused by _______.

pressure

Sudden pressure relays operate on a:

rapid increase in the main tank

The Wheatstone bridge is used to measure

resistance

An accessory used to allow a circuit breaker to be remotely operated is called a/an _________.

shunt trip

The size of the neutral conductor is determined by which of the following:

unbalanced current

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?

voltmeter or phasing sticks

In a wye connected system, without neutral grounding, zero sequence currents are:

zero