LINEMAN APPRENTICE RODEO CARDS ACTUAL EXAM COMPLETE 310 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!.
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LINEMAN APPRENTICE RODEO CARDS
Institution
LINEMAN APPRENTICE RODEO CARDS
How do the voltage levels of transmission, sub-transmission, and distribution lines compare? - answer-High voltages used for AC transmission lines are 115,000; 138,000; 161,000 volts - Extra-High-voltage (EHV) Lines are energized at 345,000 - 765,000 volts.
When are direct-current transmission l...
LINEMAN APPRENTICE RODEO CARDS
ACTUAL EXAM COMPLETE 310 QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW!!.
How do the voltage levels of transmission, sub-transmission, and
distribution lines compare? - answer-High voltages used for AC
transmission lines are 115,000; 138,000; 161,000 volts - Extra-High-voltage
(EHV) Lines are energized at 345,000 - 765,000 volts.
When are direct-current transmission lines used? - answer-Overhead
direct-current transmission circuits are used where it is desired to transmit
large amounts of power over long distances or to interconnect 2 AC
systems that are not synchronized. E.g. a 400,000 Volt line could operate
with one conductor positive and one conductor negative.
List the functions that can be accomplished in an electric substation. -
answer-Switch generators, equipment and circuits or lines in and out of the
system Change AC voltage levels. Change AC Current to DC Current or
vice versa
List the component parts of the electric distribution system. - answer--
Distribution substation -Distribution Feeder Circuits - Switches - Protective
Equipment - Primary Circuits - Distribution Transformers - Secondary's -
Services
Describe a typical distribution feeder circuit. - answer-
What is a primary circuit? - answer-All high-voltage distribution circuits
greater than 600 volts up to 69,00 volts
Connected to Distribution or Express Feeders.
What is the purpose of the distribution transformer installed on an electric
distribution circuit? - answer-Reduce the voltage of the primary circuit to the
utilization voltage required to supply the customer.
,Describe an electric service. - answer-Wires extending from the secondary,
or distribution transformer, adjacent to the customer's property to the
customer's premises.
o Triplex, quadriplex, open buss.
What is the purpose of an electric substation? - answer-An electrical
substation is an installation with electrical equipment capable of interrupting
or establishing electrical circuits and changing the voltage, frequency or
other electrical energy flow characteristics.
What are power transformers used for in an electric substation? - answer-
Transformers are used to change the voltage from one level to another, to
regulate the voltage level, and to control the flow of reactive kVa in the
power system.
Draw a schematic diagram of a distribution transformer secondary winding
connected for 120-volt 2 wire operation and 120/240 volt three-wire
operation. - answer-
How can the polarity of a transformer be determined? - answer-
Why are some distribution transformers manufactured with taps on the
primary windings? - answer-Windings of distribution transformers can be
manufactured with various taps to broaden the range of primary voltages
suitable
for a given installation.
2.5% change increments
Describe the theory of operation of an elementary lightning arrester. 16,
395-396 - answer-When a high voltage exists on the line, the arrester
immediately furnishes a path to ground and thus limits and drains off
the excess voltage.
Provides a low-impedance path to ground for the current from lightning or
transient voltages and then restores normal
circuit conditions.
Provides a point in the circuit at which the overvoltage impulse can pass to
earth without damage to line insulators,
transformers, or other line connected equipment.
Prevents any follow-up power current from flowing to ground.
, Describe the operation of a metal-oxide valve-type lightning arrester. -
answer-
What is the basic insulation level of a 15kV system? 16, 401. - answer-95
Why must the surface of high voltage transmission line conductors be
protected from scratches while they are being installed? - answer-
Conductors with surface scratches or defects energized at high voltages
will have corona losses and generate radio-interference voltages that will
be transmitted through the atmosphere.
Why is it necessary to effectively ground conductors while they are being
installed? - answer-To eliminate induced, static or impulse voltages that
may be present during construction.
Describe the procedures to be followed to reconductor distribution lines. -
answer-Relocate existing lines?
Install temporary / permanent pole supports
Install stringing equipment and ground
Position tensioner and puller
String in conductor
When should conductors be sagged? - answer-As soon as conductor
stringing is completed.
What types of equipment can be found in a typical substation? - answer-
What function is accomplished with circuit breakers installed in electric
substations? - answer-Switch electric circuits and equipment in and out of
the system
Why are disconnect switches installed in series with circuit breakers? -
answer-To facilitate isolating substation equipment for maintenance.
What function is accomplished with protective relays installed in a
substation? - answer-dentify electrical failures on transmission and
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