SLTC 2025/2026 QUESTIONS AND SOLUTION RATED A+
✔✔These are used to cut in or out portions of the transformer windings which adjusts
the voltage levels? - ✔✔Load Tap Changer
✔✔These are designed to interrupt current under normal load conditions and also under
short circuit or "fault" conditions. - ✔✔Circuit breakers
✔✔The breaker control system must be designed to trip the breaker _____ and ______
in the event of a fault. - ✔✔quickly and automatically
✔✔These sense faults and send signals to the appropriate breaker to trip. -
✔✔Protective relays.
✔✔Name the 4 different types of circuit breakers. - ✔✔Oil, SF6, Air, Vacuum
✔✔These provide equipment protection and are also used to energize and de-energize
capacitor banks and other circuits. - ✔✔Circuit Switchers
✔✔These switches are used to redirect or cutoff power flows for load balancing or
sectionalizing so you can isolate pieces of equipment for maintenance or testing. -
✔✔Disconnect Switches
✔✔What is the most important thing that a disconnect switch does? - ✔✔Provides a
visible break in the circuit
✔✔What do current transformers do? Potential Transformers? - ✔✔CT: Reduce current
levels in the lines PT: step down the circuits high voltage to a desired secondary voltage
✔✔What the primary intention of of grounding transformers? - ✔✔Provide a neutral
point for grounding purposes
✔✔These are used to automatically adjust the voltages as required. - ✔✔Regulators
✔✔These devices are used to assist in controlling the flow of power in the system. -
✔✔Capacitors
✔✔In a 4 wire WYE system the _______ carries the unbalanced portion of the load and
is also the return path to its source. - ✔✔Neutral
✔✔_____ network leaves the station and passes through the network area with no
connection to any other source. - ✔✔Radial
,✔✔This design has 2 paths between the power sources and each customer. - ✔✔Loop
✔✔This design involves multiple paths between all points in the network. - ✔✔Network
✔✔List the following in order of reliability loop, network, radial - ✔✔1. Network 2. Loop
3. Radial
✔✔what are the 3 main elements of a distribution line? - ✔✔Primary voltage, secondary
voltage, services
✔✔What the rule for how far a pole must be put into the ground? - ✔✔10%+2'
✔✔What type of guy attaches to the top of a pole and attached to an anchor rod? -
✔✔Down Guy
✔✔What guy is used for clearance over a sidewalk? - ✔✔Mast arm/ sidewalk guy
✔✔What guy attaches energized to non-energized? - ✔✔Stub guy
✔✔What guy goes from energized to energized? - ✔✔Span guy
✔✔What guy attaches to the the top of a pole to a point below the top of an adjacent
pole. - ✔✔Head Guy
✔✔What guy uses a pole as a brace? - ✔✔Push Guy
✔✔When stringing conductors its recommended you wait how many hours before tying
the conductor in? - ✔✔24hrs
✔✔What are the 4 methods to sagging wire? - ✔✔Stop watch, unisag watch,
Dynamometer(Most used), sag scope/transit(most common on transmission)
✔✔What are the 4 major components when sagging wire to calculate the tension? -
✔✔Temperature, Size of wire, type of wire, length of ruling span
✔✔What is the function of the voltage regulator? - ✔✔Maintain constant voltage on the
distribution line
✔✔What are the 3 check points to ensure a regulator is in the neutral position? - ✔✔1.
Dial on zero 2. Neutral light on 3. Buck and boost
✔✔What is the purpose of a capacitor? - ✔✔Improve efficiency of the circuit by reducing
the flow of useless power
, ✔✔How long do you wait after disconnecting a capacitor? - ✔✔5 minutes
✔✔Capacitors introduce Capacitive reactance which counteracts the negative effects of
what? - ✔✔Inductive reactance
✔✔These are devices that can open and close automatically re-energizing the circuit up
to 4 times, giving the fault time to clear itself. - ✔✔Reclosers
✔✔These are designed to isolate faults in conjunction with reclosers. - ✔✔Sectionalizer
✔✔These are used throughout the main line to either redirect power or to sectionalize a
portion of line. - ✔✔Gang operated switches
✔✔____ is a term used to describe the transition from overhead to underground and in
some cases URD to OH - ✔✔Riser
✔✔What isn't available on a transmission line for a ground source? - ✔✔NeutralSystem
✔✔Many transmission lines are long and constructed with __ circuits to gain the
advantage of single right of way - ✔✔2
✔✔What style clamp is most likely needed for grounding on transmission lines? -
✔✔Flat Style Clamps
✔✔T/F the cable used for transmission grounding sets is different than distribution sets?
- ✔✔False
✔✔Grounding jumpers must be kept how long? - ✔✔As short as possible
✔✔Transmission grounding involves larger structures with _____ spacing between the
phases. - ✔✔Larger
✔✔Many transmission lines utilize bundled conductors consisting of 2 to 6 _________
per phase - ✔✔sub-conductors
✔✔Most transmission grounds are at least what size? - ✔✔2/0 copper
✔✔T/F a lattice tower itself can be used as a cluster bracket? - ✔✔True, a cluster
bracket only has to be installed if a grounding set is not equipped with a tower
grounding clamp at one end
✔✔These are used to cut in or out portions of the transformer windings which adjusts
the voltage levels? - ✔✔Load Tap Changer
✔✔These are designed to interrupt current under normal load conditions and also under
short circuit or "fault" conditions. - ✔✔Circuit breakers
✔✔The breaker control system must be designed to trip the breaker _____ and ______
in the event of a fault. - ✔✔quickly and automatically
✔✔These sense faults and send signals to the appropriate breaker to trip. -
✔✔Protective relays.
✔✔Name the 4 different types of circuit breakers. - ✔✔Oil, SF6, Air, Vacuum
✔✔These provide equipment protection and are also used to energize and de-energize
capacitor banks and other circuits. - ✔✔Circuit Switchers
✔✔These switches are used to redirect or cutoff power flows for load balancing or
sectionalizing so you can isolate pieces of equipment for maintenance or testing. -
✔✔Disconnect Switches
✔✔What is the most important thing that a disconnect switch does? - ✔✔Provides a
visible break in the circuit
✔✔What do current transformers do? Potential Transformers? - ✔✔CT: Reduce current
levels in the lines PT: step down the circuits high voltage to a desired secondary voltage
✔✔What the primary intention of of grounding transformers? - ✔✔Provide a neutral
point for grounding purposes
✔✔These are used to automatically adjust the voltages as required. - ✔✔Regulators
✔✔These devices are used to assist in controlling the flow of power in the system. -
✔✔Capacitors
✔✔In a 4 wire WYE system the _______ carries the unbalanced portion of the load and
is also the return path to its source. - ✔✔Neutral
✔✔_____ network leaves the station and passes through the network area with no
connection to any other source. - ✔✔Radial
,✔✔This design has 2 paths between the power sources and each customer. - ✔✔Loop
✔✔This design involves multiple paths between all points in the network. - ✔✔Network
✔✔List the following in order of reliability loop, network, radial - ✔✔1. Network 2. Loop
3. Radial
✔✔what are the 3 main elements of a distribution line? - ✔✔Primary voltage, secondary
voltage, services
✔✔What the rule for how far a pole must be put into the ground? - ✔✔10%+2'
✔✔What type of guy attaches to the top of a pole and attached to an anchor rod? -
✔✔Down Guy
✔✔What guy is used for clearance over a sidewalk? - ✔✔Mast arm/ sidewalk guy
✔✔What guy attaches energized to non-energized? - ✔✔Stub guy
✔✔What guy goes from energized to energized? - ✔✔Span guy
✔✔What guy attaches to the the top of a pole to a point below the top of an adjacent
pole. - ✔✔Head Guy
✔✔What guy uses a pole as a brace? - ✔✔Push Guy
✔✔When stringing conductors its recommended you wait how many hours before tying
the conductor in? - ✔✔24hrs
✔✔What are the 4 methods to sagging wire? - ✔✔Stop watch, unisag watch,
Dynamometer(Most used), sag scope/transit(most common on transmission)
✔✔What are the 4 major components when sagging wire to calculate the tension? -
✔✔Temperature, Size of wire, type of wire, length of ruling span
✔✔What is the function of the voltage regulator? - ✔✔Maintain constant voltage on the
distribution line
✔✔What are the 3 check points to ensure a regulator is in the neutral position? - ✔✔1.
Dial on zero 2. Neutral light on 3. Buck and boost
✔✔What is the purpose of a capacitor? - ✔✔Improve efficiency of the circuit by reducing
the flow of useless power
, ✔✔How long do you wait after disconnecting a capacitor? - ✔✔5 minutes
✔✔Capacitors introduce Capacitive reactance which counteracts the negative effects of
what? - ✔✔Inductive reactance
✔✔These are devices that can open and close automatically re-energizing the circuit up
to 4 times, giving the fault time to clear itself. - ✔✔Reclosers
✔✔These are designed to isolate faults in conjunction with reclosers. - ✔✔Sectionalizer
✔✔These are used throughout the main line to either redirect power or to sectionalize a
portion of line. - ✔✔Gang operated switches
✔✔____ is a term used to describe the transition from overhead to underground and in
some cases URD to OH - ✔✔Riser
✔✔What isn't available on a transmission line for a ground source? - ✔✔NeutralSystem
✔✔Many transmission lines are long and constructed with __ circuits to gain the
advantage of single right of way - ✔✔2
✔✔What style clamp is most likely needed for grounding on transmission lines? -
✔✔Flat Style Clamps
✔✔T/F the cable used for transmission grounding sets is different than distribution sets?
- ✔✔False
✔✔Grounding jumpers must be kept how long? - ✔✔As short as possible
✔✔Transmission grounding involves larger structures with _____ spacing between the
phases. - ✔✔Larger
✔✔Many transmission lines utilize bundled conductors consisting of 2 to 6 _________
per phase - ✔✔sub-conductors
✔✔Most transmission grounds are at least what size? - ✔✔2/0 copper
✔✔T/F a lattice tower itself can be used as a cluster bracket? - ✔✔True, a cluster
bracket only has to be installed if a grounding set is not equipped with a tower
grounding clamp at one end
