Lesson 1 Flashcards
World Domination
The practical safeguarding of persons and property from hazards arising from the use of electricity best describes which of the following?
a. The objectives of the National Electrical Safety Code Incorrect
b. The purpose of bonding
c. The purpose of grounding
d. The purpose of the NEC
D
If a conductive part is connected to ground or to a conductive body that extends a ground connection it is ?
Grounded
Which of the following best defines the word ground?
a. A ground fault in the electrical system
b. A short in the electrical system
c. An unintentional connection to Earth
d. The Earth
D.The Earth
When electrical systems or equipment are grounded, the ground (Earth) is part of the electrical circuit.
True or False
True
The Earth as a conductive body can serve as an effective ground-fault current path to facilitate the operation of fuses or circuit breakers protecting the system.
True Or False
False
Which of the following is not a conductive body that extends the ground connection? Select one: a. Equipment bonding jumpers b. Equipment grounding conductor c. Grounding electrode conductor d. Ungrounded branch-circuit conductors
d. Ungrounded branch-circuit conductors
The frame of an automobile or airplane is not grounded.
True Or False
True
The conductive object directly connected to Earth through which grounding is established, is provided by which of the following? Select one: a. Equipment grounding conductor b. Grounding electrode c. Grounding electrode conductor d. System bonding jumper
b. Grounding electrode
Which of the following is not accomplished through electrical bonding? Select one: a. Conductivity b. Connecting together c. Continuity d. Providing overcurrent protection
D.Providing overcurrent protection
Bonding minimizes potential differences between conductive parts that are bonded together. It also safeguards against shock hazards, and in many cases ensures an effective path for ground fault current.
True or False
True
The processes of grounding and bonding work simultaneously to reduce potential differences between conductive parts and the Earth, thereby reducing shock hazards.
True or False
True
A(n) ? occurs when electrical current in a circuit returns through the equipment grounding conductor (EGC), through conductive material other than the electrical system ground (metal, water pipes, and so forth), through a person or through a combination of these ground return paths. Select one: a. arc fault b. ground fault c. overload d. short circuit
b. ground fault
Which of the following conditions is not a factor in a person receiving an electric shock?
Select one:
a. The current must exit through a second contact point.
b. There must be a contact point on the body for entry of the circuit current.
c. There must be a voltage to force the current across the human body.
d. There must be properly sized overcurrent protection in the circuit.
d. There must be properly sized overcurrent protection in the circuit.
Current will take only the path of least resistance when attempting to return to the source.
True or False
False
Grounding includes two basic concepts: grounding of equipment and grounding of systems.
True or False
True
When an electrical system is grounded, one conductor of the system is intentionally connected to ground and is referred to by the NEC as the ? conductor. Select one: a. equipment grounding conductor b. grounded c. insulated d. system bonding jumper
b. grounded
If the Code provides a requirement to ground equipment, it generally implies that there will be either a direct connection to the Earth or a connection to ground through which of the following? Select one: a. Equipment grounding conductor b. Grounding electrode c. Grounding electrode conductor d. Any of the above
d. Any of the above
An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non–current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or Earth best defines which of the following?
lect one:
a. Arcing fault
b. Dynamic impedance
c. Ground fault
d. Short circuit
c. Ground fault
Which of the following are characteristics of an effective ground-fault current path?
Select one:
a. Intentionally constructed
b. Low-impedance electrically conductive path
c. Designed and intended to carry current during ground-fault conditions
d. All of the above
d. All of the above
A(n) ? is an electrically conductive path from the point of a ground fault on a wiring system through normally non–current-carrying conductors, equipment, or the Earth to the electrical supply source. Select one: a. effective ground-fault current path b. ground fault c. ground-fault current path d. short-circuit current path
c. ground-fault current path
In an ungrounded electrical system there is normally no connection to Earth from any conductor supplied by the system, other than through distributed leakage capacitance.
True or False
True
In a grounded system, normally non–current-carrying electrically conductive materials that are likely to become energized, such as building metal framing and metal water piping, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.
True or False
True
The total opposition to current in an AC circuit is known as circuit ? .
a. amperage
b. impedance
c. resistance
d. voltage
b.impedance
The opposition to current in a DC circuit is ? .
a. amperage
b. impedance .
c. Resistance
d. voltage
C.Resistance
Loose connections in the equipment grounding conductor and effective ground-fault current path introduce additional impedance that can impact overcurrent device operation.
True
False
True
All electrical conductors and equipment covered by the NEC are required to be installed in a neat and workmanlike manner.
True or False
True
Not connected to ground or to a conductive body that extends the ground connection best describes which of the following terms? Select one: a. Grounded b. High-impedance grounded c. Solidly grounding d. Ungrounded
d.ungrounded
When an electrical system is not grounded, there is no intentional connection between any of the system conductors and the Earth.
True or False
True
Where the Code requires a conductive part or a system to be grounded, a connection to ? is implied and required. Select one: a. earth b. metal parts c. the grounded conductor d. the service equipment
a.earth
If there is no connection to the ground (earth) there is no grounding.
Select one:
True
False
True
Which of the following is not a performance function of grounding?
Select one:
a. Protecting against line surges
b. Protecting against unintentional contact with higher voltage lines
c. Providing an effective ground-fault current path
d. Stabilizing voltage to ground
c. Providing an effective ground-fault current path
