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LINEMAN APPRENTICE RODEO STUDY QUESTIONS AND VERIFIED ANSWERS
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LINEMAN APPRENTICE RODEO STUDY QUESTIONS AND VERIFIED ANSWERS...
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LINEMAN APPRENTICE RODEO STUDY QUESTIONSAND VERIFIED ANSWERS
Describe the electron theory - ANSWER anything that takes up space and has
mass is made up of atoms. atoms are further divided into even smaller sub-
particles called protons, neutrons, and electrons
define an electrical current - ANSWER when electrical pressure is applied
across the length of wire the free electrons in the wire abandon or give up their
random motion and move or flow in one general direction.
define a conductor - ANSWER materials having free electrons
define an insulator - ANSWER material having few free electrons
what are three examples of good insulators? - ANSWER glass, porcelain,
rubber
what is the unit of electric current? - ANSWER ampere/amp
what instrument is used to measure electric current - ANSWER ammeter
what is the unit of electric pressure? - ANSWER voltage
what is the unit of electric power? - ANSWER watt
what is the unit of electric energy? - ANSWER watts
,what instrument is used to measure electric energy? - ANSWER voltmeter
what is the formula for ohms law? - ANSWER V=IxR
(voltage=CurrentxResistance
definition of alternating current - ANSWER electric current which periodically
passes through a regular succession of changing values, both positive and
negative
what is the unit of an alternating-current frequency? - ANSWER hertz
define the power factor of an alternating-current curcuit - ANSWER the ratio
of the actual power to the product of volts times amperes
PF=watts/VoltsxAmperes
Describe the theory of operation of an electric transformer - ANSWER: voltage
must be stepped up and then must be stepped down. the transformer is the
apparatus used to make these changes
Describe a typical electric system - ANSWER: powerplant, transmission,
transmission lines, substation, distribution
what is a transmission line? - ANSWER a set of conductors energized at more
than 69,000 volts and carrying large blocks of electrical energy for relatively
long distances
how does voltage levels of transmission, subtransmision, and distribution
differ? - ANSWER transmission circuits: 69kV-765kV, subtransmission
, When does a direct current transmission line show up? - ANSWER To
transmit large amounts of power over long distances or to interconnect two AC
systems that are not synchronized
List of things that can be done in an electric substation - ANSWER Switch
generators, equipment, and circuits or lines in/out of the system, change AC
voltage from on level to another, or changing AC->DC or DC->AC
list the component parts of the electrical distribution system - ANSWER (1)
distribution substation, (2) distribution feeder circuits, (3) switches, (4)
protective equipment, (5) primary circuits, (6) distribution transformers, (7)
secondaries, and (8) services
describe a conventional distribution feeder circuit - ANSWER act as a source to
branch or primary circuits and are sometimes called distribution main-feeder or
express feeder circuits
what is a primary circuit? - ANSWER distribution circuits greater than 600
volts up to 69,00 volts are often referred to as primaries by lineman
what is the purpose of a distribution transformer? - ANSWER to reduce
voltage of the primary circuit to the utilization voltage required to supply the
customer
Describe an electrical service - ANSWER the wire extending from the
distribution transformer, next to the customers property to the customers
premises are called a service
what is the function of an electrical substation - ANSWER an electrical
substation is an installation that includes electrical equipment able to open or
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