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