Round 1 Flashcards
An object that is a good reflector is also a:
Poor emitter
In a power system, what would installing
capacitors accomplish?
Power factor correction and _______________
What would not significantly
reduce ground resistance?
Increased ground rod diameter
Class 4 rubber insulating gloves are proof
tested at 40,000 VAC, what is the AC max use
voltage of these gloves?
36,000
How much torque does the 41,000 RPM
turbine section of a 5kV 300 HP gas turbine
generator engine produce?
38 lb-ft
Help: Torque = HP x 5252 / RPM
Low voltage is defined as a class of nominal
1000
The unit of electromotive force is the:
Volt
What is the expected contact-resistance
measurement for a 4000A 480V air circuit
breaker in good condition?
8-24 microhms
less than 30 microhms
Which device functions when the ratio of
voltage to frequency (V/Hz) exceeds a preset
value?
24
Class C hard hats are a good choice for
protection from electrical hazards.(T/F)
False
What is the minimum acceptable PI value for
a newly installed 200kW emergency generator
per NETA standards?
2.0
Switchboards, switchgear, and panelboards
used as service equipment on high-impedance
grounded neutral systems are required to be
provided with a main bonding jumper(T/F)
False
What is the expected torque (pound-feet)
value of a 3/8” Grade 5 bolt?
20
Plastic and glass covers in electrical
enclosures are transparent to infrared radiation.(T/F)
False
What is the Limited Approach Boundary for
a 13.2kV switchgear?
5 feet
What are two relatively new risk assessments?
Human error and Hierarchy of risk control methods
Most probable cause of corona:
Moisture
In the National Electrical Code, Article _____
contains tables that are used to determine the
proper size of a conductor.
310
Meter Sockets and meter disconnect
switches should generally be connected on the
load side of a service disconnecting means.(T/F)
False
Which instrument is used to locate a 15kV
underground cable fault?
Time domain reflectometer
When is transformer polarity of concern?
When multiple sets of
primary and secondary windings are interconnected
A face shield has an 11cal/cm^2 rating
imprinted on it. What does this rating mean?
You have a 50% chance of
receiving a second degree burn on bare skin.
What is the NETA recommended acceptance
test voltage for a 15 minute withstand test on a
single-phase, 15kV line sectionalizer with a
rated impulse withstand voltage of 95kV?
53kVDC
Negative Phase sequence relays are used to
protect _____ from phase to phase faults.
Generators
Rod and pipe grounding electrodes must be
at least _____feet in length in accordance with
the NEC.
8
In general, the most important point to
monitor in regards to the operation of
transformers is _______?
Temperature
How much energy does a 2.5MW turbine
produce in one complete cycle?
0.012 KWh
Which of the following refers to the current a
switchboard or protective device can carry
continuously without deterioration and without
exceeding temperature rise limits?
Ampere rating
The vacuum bottle Integrity test provides an
indication of:
The current state of the vacuum
bottle
The continuous current rating of a circuit
breaker will be determined by the ______.
Sensor rating/tap, with long-time
delay setting
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
The applied DC voltage on a cable hipot test
is ______ that for an AC test.
Higher than
In HV circuit breakers, the steady state
contact stroke minus the rebound distance is
defined as:
Minimum dynamic contact gap
Filters are used to reduce what?
Harmonics
When arcing occurs in SF6 , what is one
hazardous byproduct?
Metal fluorides
An object that is a poor emitter is also a:
Good reflector
Increased ground rod diameter significantly reduces ground resistance.(T/F)
False
What color label does a class 4 rubber insulating glove have?
Orange
What color label does a class 3 rubber insulating glove have?
Green
What color label does a class 2 rubber insulating glove have?
Yellow
What color label does a class 1 rubber insulating glove have?
White
What color label does a class 0 rubber insulating glove have?
Red
Class 3 rubber insulating gloves are proof
tested at 30,000 VAC, what is the AC max use
voltage of these gloves?
26,500
Class 2 rubber insulating gloves are proof
tested at 20,000 VAC, what is the AC max use
voltage of these gloves?
17,000
Class 1 rubber insulating gloves are proof
tested at 10,000 VAC, what is the AC max use
voltage of these gloves?
7,500
Class 0 rubber insulating gloves are proof
tested at 5,000 VAC, what is the AC max use
voltage of these gloves?
1,000
How much torque does the 29,000 RPM
turbine section of a 13.2kV 600 HP gas turbine
generator engine produce?
109 lb-ft
Help: Torque = HP x 5252 / RPM
Class E hard hats are a good choice for
protection from electrical hazards.(T/F)
True
What is the minimum acceptable PI value for
a newly installed 500kW emergency generator
per NETA standards?
2.0
What is the expected torque (pound-feet)
value of a 1/2” Grade 7 bolt?
68
What is the Limited Approach Boundary for
a 138 kV bus?
10 feet
What is the NETA recommended acceptance
test voltage for a 15 minute withstand test on a
single-phase, 38kV line sectionalizer with a
rated impulse withstand voltage of 150kV?
103kVDC
How much energy does a 1.2MW turbine
produce in one complete cycle?
0.006 kWh
A wye-delta transformer has a primary line
voltage of 4800 V and a secondary voltage of
360 V. What is the turns ratio?
7.70:1
The applied AC voltage on a cable hipot test
is ______ that for an DC test.
Lower than
