SWLCAT Distribution Basics 1 Practice Test

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• A guy wire is pulled up or tightened by means of a hoist and which grip meant for steel?
• In a wye configuration, the phase current equals the line current.
• A pole hole for a 65 ft class 2 pole depth is 8.5 feet.
• Tensioning of the guy wires is important for load distribution on the pole.
• Bonding together and grounding of guys on overhead lines are done to reduce stray electrical current and corrosion.
• In the line tension problem, what is the conductor cross-section expressed in kcmil?
• If a line voltage of 480 V exists in a Wye-connected system, the phase voltage is approximately 277 V.
• A wire guy running from the top of one pole to the top of an adjacent pole is called a(n) ? guy.
• For H = 50 ft, L = 40 ft, and a conductor tension of 600 lbs per conductor at the guy height, the tension on the guy is approximately what value?
• A which hoist is the most suitable hoist for pulling a guy?
• The depth triggering the exit requirement is four feet.
• One advantage that overhead distribution systems have over underground systems is that they are easier to detect and repair.
• The strength of a guy needed for a job can be calculated by a simple field formula.
• Storm guys installed to prevent cascading pole failures consist of how many guys?
• The height of the ? above the ground is one of the three factors that need to be considered when guying a pole line.
• When a 3-phase, 3-wire, 7,200-volt delta circuit is cut over to a 3-phase, 4-wire wye circuit, the line voltage becomes approximately?
• Before removing the location of the stake at the site of the hole, what should a qualified electrical worker do?
• A polymer suspension insulator cannot withstand the tension of deadend conductors. This statement is:
• Which equipment is used with the tubular wrench to install a screw anchor?
• Which of the following is NOT listed as a type of communications system used by utilities?
• Which statement about pin-type insulators is true?
• Arm guys are used where ? pull on a crossarm exists.
• If a suspension insulator string is made up of 50 kip insulators, the string can withstand how many pounds of tension?
• Overhead line insulators help prevent current from flowing into the supporting structures.
• In safety terminology, safety controls are designed to reduce the risk of injury in the event of which situation?
• Which statement about bolts on poles is correct?
• Cogeneration heat sold to central heating plant or manufacturer.
• Some electrical providers require guys to be bonded together and grounded to reduce stray electrical current and corrosion.
• A pole without guy support can support only which type of loads?
• Near a live circuit, one safety step is to prevent the pole and equipment from doing what?
• Most electric energy is generated at a voltage range of ______ and then stepped up to transmission line voltage.
• Most construction projects and utilities have specification drawings to show how a pole is to be framed. Using good judgment, a Qualified Electrical Worker is allowed to make changes to the framing.
• Radial distribution design is often described as analogous to which shape?
• In a delta-connected 3-phase system, the windings are connected in series.
• What is the term for a wire running from the attachment near the top of the pole to a ground anchor?
• What is the most common method for digging pole holes?
• An expansion anchor is fully spread when the hollow sound of the first blow changes to a dull thud.
• In a delta system, the phase voltage equals the line voltage.
• Which configuration yields Vline equal to Vphase?
• In a delta-connected system, the line voltage is equal to the phase voltage.
• A 69-kilovolt suspension insulator string is likely to have how many porcelain insulators?
• The most common method for digging pole holes is with a
• The notation 7200/12470Y V describes which three-phase configuration?
• When marking the circle for a pole hole, the diameter of the hole should be marked ____ larger than the diameter of the pole butt.
• A ? anchor is installed so that the boom will follow the anchor as it is screwed into the ground in order to maintain the proper alignment and down pressure.
• The hole for a slug anchor is dug at an angle so that the rod and anchor can be angled towards the pole.
• A screw anchor is screwed into the ground by means of a special tubular wrench and the power drive on a line truck or digger.
• A one-piece insulator can withstand a higher voltage than a two-piece insulator.
• Electrical energy cannot be transported economically over long distances.
• In a delta system, if the phase current is 200 amperes, the line current is?
• The glaze on a porcelain insulator helps shed water.
• If the line current in a wye system is 200 amperes, what is the phase current?
• Which of the following is NOT a main system?
• A 3/8-inch high strength steel guy wire has an allowable tension strength of how many pounds?
• Generating stations are interconnected by transmission lines into giant regional pools or grids that cross utility boundaries.
• To dig a pole hole in rocky soil, which method would be used?
• If a pole is set near an energized line, it should be covered with protective equipment, and the Qualified Electrical Worker should have a dedicated observer.
• For the same setup, what is the approximate tension at the guy rod 15 feet from the butt?
• Guy guards or markers are essential to keep down guys in what way?
• Post insulators are most likely to be found when a line is built on a which environment?
• The statement that dead-end and corner poles are typically pulled over 1 to 1.5 feet from plumb when a guy is installed is:
• In a balanced three-phase system, by how many degrees are the voltages separated?
• When digging a pole hole, which factor determines the hole diameter?
• Which type of device is used to span across a sidewalk?
• Which of the following statements about anchor rod length ranges is correct?
• According to the rule of thumb for sizing a guy, you add the height of the guy attachment above the ground, plus what percent of the distance from the pole to the anchor?
• Anchor rods vary from 1/2 inch to 1 1/4 inch in diameter.
• Before digging, you should call 811.
• Which pair of terms correctly matches an expansion anchor with its alternative name?
• The claim that polymer insulators are lightweight but do not maintain high dielectric or mechanical strength is:
• There are three different voltages available in a wye connected system.
• What is the span length in the line tension problem?
• In helicopter pole setting, rope handlers are connected to which before the pole can be released?
• Where should the groundman stand when pulling up material to a worker on the pole?
• Pin-type insulators can be two or more pieces cemented together.
• A pole for a 65 ft, class 2 pole should be dug in soil to a depth of
• Three types of material from which a guy strain insulator is manufactured are porcelain, fiberglass, and which material?
• When setting a pole with a digger derrick, the truck should be grounded to neutral or other good ground to promote a quick trip-out of the circuit in case of accidental electrical contact.
• In a delta system, how many wires are typically involved?
• The current flow in a wye circuit is about what percent less than in an equivalent delta circuit.
• The crossarm on a steel lattice tower is commonly called a bridge. This statement is:
• Each helix of a double helix anchor acts as a separate anchor.
• In a delta connected 3-phase system, the line current is equal to the phase current.
• When there is more than one guy installed on the same side of a pole, the top guy must be tensioned higher to carry the extra load.
• Which pole setting method uses a digger derrick to position the pole into the hole?
• What is the purpose of a three-bolt clamp on a guy wire?
• What component is used to change voltage levels in a distribution network?
• PVC is not commonly used as a material for overhead line insulators.
• An 80 ft pole in good soil should be set to a depth of
• Which of the following correctly names an underground distribution system type?
• A(n) ? is used where a down guy or span guy is not feasible.
• What is a typical transmission circuit voltage?
• Why do some utilities use wood braces near crossarms?
• Direct bury is one of the main types of underground distribution systems.
• Working around excavations is one of the ___ jobs in the construction industry.
• The most commonly used 3-phase distribution system is the wye system.
• A switchyard ties the many circuits coming into the yard into a common circuit called a bus.
• Guy wires can be secured with which hardware along with preformed grips?
• What is the purpose of side or alley arms on a distribution system?
• A power-installed screw anchor is installed by a machine and causes very little soil disturbance.
• An ___ is a man-made cut, cavity, trench, or depression in the earth's surface formed around earth's removal.
• How far should a lag screw be driven with a hammer from the tight position before final seating?
• What does bow refer to in a wooden pole?
• In general, anchors rely on undisturbed soil for holding power except when the anchors are placed in solid rock.
• The description of setting a pole that involves picking up the pole with a winch line above the balance point while someone controls the butt uses which method?
• The pole gin method is often used in areas such as
• When guiding material up to a worker on a pole, where should the groundman stand?
• Installing a three-bolt clamp to a guy wire ensures that there will be no loss of tension when the hoist is released.
• It is a good practice to wrap tape around the guy wire on each side of the cutting point to keep the strands from fraying or unlaying.
• The wye system is also called a ? system.
• Which of the following is a type of communications system used by utilities?
• The log anchor is often referred to as a ? or slug anchor.
• Which material is not a typical material for a guy strain insulator?
• Which type of guy runs from the top of a pole to a ground anchor?
• Which device is used to support a pole when re-pulling a loaded down guy?
• When a 3-phase transformer bank is connected with one end of each coil connected together at a common point, this configuration is called Wye.
• In a wye connected system, the line current equals the phase current.
• In a wye-connected system, the relationship between line-to-line and line-to-neutral voltages is V_LL = sqrt(3) × V_LN.
• The tamping clearance around the pole hole is three inches.
• In the gin method, the pole is manipulated by tipping the pole or picking up just above the balance point and then lowering it into the hole. This describes which method?
• If the voltage is doubled the energy that can be transmitted is doubled without an increase in the line losses.
• A _____ network is used for heavily loaded downtown areas.
• When an operator has remote control over the system through the use of a communications system between stations, that control is known as:
• If the phase-to-phase voltage in a wye system is 208 volts, the phase-to-neutral voltage is?
• What unit is used to express the tension values in the examples?
• When switching from delta to wye, the line voltage becomes approximately 1.732 times higher.
• The ___ Rule, as applied to excavations, states that an exit must be provided if the excavation is four feet deep and there is the possibility of a cave-in.
• Each helix of a double helix anchor acts as a separate anchor for more holding power.
• Is it acceptable to climb down a polymer insulator to the conductor level on a transmission line?
• If the line voltage in a delta system is 2,400 volts, the phase voltage is 2,400 V.
• Which configuration yields Vline equals sqrt(3) times Vphase?
• According to the lesson, how many tools are there to manually hand dig a hole?
• What is the minimum portion (in inches) of the anchor rod that should remain above ground after installation?
• For the pike pole method, the fewest number of people required to set a pole is?
• A guard or marker should be installed even if there is no car or pedestrian traffic exposure.
• If the line-to-line voltage is 208 volts in a wye system, the phase-to-neutral voltage is 120 volts.
• Two factors that determine how deep a pole should be set are the type of soil and the ____.
• Which term completes the phrase: 'Hand wire ties or ____ ties are used to fasten a conductor on most top tie insulators'?
• The rule of thumb for predicting guy wire length uses height of attachment plus what percentage of the distance from pole to anchor.
• The porcelain guy strain insulator design relies on overlapping holes to keep the porcelain under compression.
• What happens when a circuit breaker is in the non-reclose (one shot) position?
• Which term describes a man-made cut in the earth's surface for removal?
• What is the maximum length mentioned for anchor rods?
• Guy strain insulators are used to reduce the risk of public contact with a guy that has become energized.
• Which term is used for a log anchor and is sometimes referred to as a slug anchor?
• There are ___ main segments to a distribution system.
• Angle-iron braces are fitted to which part of the crossarm?
• The best practice when installing guy wires is to wait until the conductors are sagged, and then pull the pole back with the guy, to its finished position.
• The statement 'Underground utilities on an excavation project are not a hazard because of the One Call system' is true.
• If an exit must be provided at an excavation the exit must be within ____ of lateral travel from the worker.
• A pole hole for a 100 foot, class H1 pole should be dug in soil to a depth of
• Which insulator type is commonly used on poles to support conductors in a cantilevered configuration?
• When cutting guy wire near a live circuit, you should secure the wire on both sides to prevent contact.
• What is the sag in the line tension problem?
• Wood and fiberglass cross arms have an electrical advantage because of their
• After installation, an anchor rod should be left at least how many inches out of the ground?
• When material and equipment are installed on a pole, bolts should be installed so that the head of the bolt carries the heavy weight.
• In a delta circuit, the line current is equal to the phase current multiplied by which factor?
• Which anchor type is installed so that the boom will follow the anchor as it is screwed into the ground to maintain the alignment and down pressure?
• Two factors that govern the type of anchor to be chosen for a job are the type of load to be anchored and the ?
• What term describes the common circuit formed by tying multiple circuits in a switchyard?
• Wooden arms are made mainly of two types of wood: pine and
• Which term describes a log anchor used in field operations?
• One piece porcelain pin-type insulators are used on lines where the voltages are less than which value?
• The voltage measured across a single winding or phase is known as the phase voltage.
• What is the purpose of placing the circuit breaker in non-reclose (one shot) position?
• Where an anchor and guy would interfere with traffic or otherwise be in the way, a(n) ? guy is used.
• The two basic types of 3-phase distribution systems are symbolized by a delta symbol (Δ) and the letter which?
• When manually digging a pole hole, which tool is used to remove dirt from the bottom of the hole?
• A porcelain guy strain insulator is strong enough to hold the high tension of a guy under load because the two holes at right angles overlap each other, so that the porcelain is under compression.
• Which term best describes the portion of the electrical system that delivers electricity to customers?
• What is the voltage rating per disk for porcelain or glass suspension insulators?
• During pole lifting, the winch line is attached just above which point on the pole?
• Which statement about underground distribution systems is true?
• Which device is used to reduce public contact with a guy wire that could become energized?
• Which factor is not a determinant of pole hole depth?
• Which of the following is NOT among the three rock anchor types?
• When framing a pole, ? is one of the considerations
• Most electrical energy produced worldwide comes from steam-driven turbines.
• The line voltage increases by what factor when converting from delta to wye?
• Steel pins have lead threads to prevent what on the insulator?
• When sending a crossarm up a pole, which knot technique is used around the insulator pin to allow the crossarm to go up straight?
• A porcelain suspension insulator uses a ball-and-socket design which places the insulating material under which loading to create strength?
• On a crossarm carrying three phases and a neutral, the neutral is typically identified by being mounted on an insulator made of which material?
• Wood braces are used because their insulating value is safer for Qualified Electrical Workers. This statement is:
• Which statement best describes how soil type affects holding power of anchors?
• Which energy sources are listed as used to produce steam heat for electricity generation?
• The tension on a guy decreases as the lead length decreases.
• Which device is used when a down or span guy is not feasible?
• When getting ready to dig a hole what number should be called?
• For H = 50 ft, L = 60 ft, and a conductor tension of 600 lbs per conductor at the guy height, the tension on the guy is approximately what value?
• When hoisting a long string of insulators, care should be taken not to excessively bend the string because it can damage what components?
• Which unit is used to express tension on the conductor in the examples?
• Besides dirt and moisture, what is another likely cause of insulator flashover?
• On a pole, shrinkage can often cause interference with which type of signal?
• What is a commonly used medium voltage on distribution circuits?
• An anchor rod may be below grade level if an anchor rod extension is not available and the guy is finished off before backfilling.
• The power plant is a main segment of a distribution system.
• A ? guy consists of a wire running from the attachment near the top of the pole to an anchor installed in the ground.
• Testing an anchor ensures the anchor will not be subjected to electrolysis.
• Generating stations are interconnected by transmission lines into giant regional pools that cross utility boundaries.
• If the lead distance for an anchor is too short for the load to be applied, one engineering solution is to install a heavier class pole.
• Which three-phase configuration is typically represented by a four-wire arrangement?
• If a pole is framed while it is lying on the ground, the down ground should not be installed if the pole is to be installed in an energized circuit.
• An expansion anchor is also called a ? anchor.
• In a wye connected system, the voltage between line terminals (line-to-line) is known as the line voltage.
• Cogeneration plants differ from regular generating stations because the heat, after generating electricity, is later sold to
• What is the term for the guy that holds the dead-end in the direction opposite the anchor?
• Corner poles and dead-end poles are installed with their face toward which feature?
• Which statement about polymer insulators is true?
• When a pole is supporting a line making more than a 60° corner, the anchors are placed so that the conductors are deadened in each direction.
• If a guy is not exposed to car or pedestrian traffic, a guy guard or marker should still be installed.
• What is the corner angle used in the bisect tension scenario?
• In a delta system, which statement is true?
• Anchor rod extensions are used to reach firm soil when installing in deep, sandy, or swampy soil.
• A push-pull brace is used where a down guy or span guy is not feasible.
• Double arms are typically used for which of the following?
• A PISA anchor is also called a(n) ? type anchor.
• Post insulators are positioned on a pole to support conductors in which orientation?
• In a wye connected system, the voltage from line tip to the center of the Y (across a single winding) is known as the line voltage.
• What is the crossarm on a steel tower commonly called?
• What is the oldest way of setting poles?
• The glaze on a porcelain insulator helps the surface shed dirt and bead water.
• Framing and equipment are put on the back of the pole to take advantage of the natural strength of the wood.
• A guy attachment is located 28.5 feet above the ground. The anchor rod is 26 feet from the pole. The guy steel should be cut how long?
• In a wye connected system, the line voltage is equal to 1.73 times the phase voltage.
• Pole hole should be big enough to allow for how many inches of tamping space all around?
• The purpose of a transmission line tower and insulators is to keep high-voltage conductors insulated from the ground and out of reach of accidental contact.
• The statement 'The hole diameter should be 6 inches larger than the pole butt diameter' is true.
• A porcelain guy strain insulator is normally installed how high above the ground?
• In rocky soil, which method is used to dig a pole hole?
• When working in the vicinity of a live circuit, it is necessary to secure (hold) the wire on both sides of the cut when cutting guy wire to prevent the springy wire from making electrical contact.
• By stringing a fourth wire and reconnecting the substation transformer secondaries from delta to wye, the capacity of the circuit can be increased by ?
• Three materials used for overhead line insulators are porcelain, polymer, and which other material?
• Which tool is used to remove dirt from the bottom of a hole when manually digging if the soil is soft?
• The bisect tension of a conductor on a corner needs to be known before the tension on a down guy can be calculated.
• In tension calculations for guying, the tension at the guy rod increases as the distance from the butt decreases.
• There are three types of anchors used in solid rock: expanding rock, rock eye, and ? anchors.
• In a delta system, the line current is sqrt(3) times the phase current.
• The generation system converts other forms of energy to what energy?
• What term describes the curvature along the length of a wooden pole?
• When using a helicopter to set a pole, rope guys must be tied to what before the helicopter can release the pole?
• Wood and fiberglass cross arms have insulating properties.
• Pin insulators are no longer used on transmission lines.
• The anchor rod of a plate anchor should be cut into the soil so that it angles towards the pole to be guyed, so the anchor will pull against the pole in undisturbed soil.
• A 240-kilovolt suspension insulator string is likely to have how many porcelain insulators?
• What are two reasons for using a digger derrick truck?
• What is the bisect tension on a 90° corner when the line tension is 500 pounds?
• Suspension insulator disks are typically made from which material?
• The delta system is also called a ? system.
• Which term describes the action of placing the anchor so that it passes through the angle's bisector for corners between 3° and 60°?
• How many methods are used for setting poles in this lesson?
• The voltages of a 3-phase system are how many degrees out-of-phase with each other?
• _____ type anchors are preferred when soil conditions will hold the anchor and rocks are not a problem during the installation.
• There are ____ categories of hazards on an excavation project described in this lesson.
• When a pole is supporting a line making a 3° to 60° corner, the anchor is placed so that it ? the corner angle.
• An electrical system can be broken into three main systems: generation, transmission, and what?
• What is the concave inside of a wood pole sweep called?
• Which grip is used with steel wire for pulling a guy?
• Transmission voltages are typically higher than distribution voltages to reduce line losses.
• The diameter of suspension porcelain insulator disks varies from 3 3/8 to what value?
• What equipment should be used to support the pole in order to safely re-pull a loaded-down guy?
• Which material is typically used for suspension insulators?
• What is the standard distance to drive a lag screw from the tight position before final seating?
• The line tension, in pounds, of a 700-foot span of 795 kcmil conductor sagged at 10 feet is what value?
• The technique of sending a crossarm up the pole involves wrapping the handline around the crossarm below the center and using a half hitch around an insulator pin. This statement is:
• Pole hole should be dug to be which of the following in order to facilitate tamping?
• Which statement best describes the benefit of using a digger derrick truck?
• Radial distribution system design is compared to a ...
• The bisect tension of a conductor exerted on a 60° corner pole is equal to line tension.
• Three materials used for overhead line insulators are porcelain, polymer, and glass.
• For a 1,000-pound conductor tension at the top of a 30-foot pole, what is the approximate tension at the guy rod 45 feet from the butt?
• Substations are used as voltage changing stations.
• The hole for an expanding anchor should be smaller than the anchor after expansion.
• Which option represents the most popular distribution voltage in use today?
• The two main types of underground distribution systems are direct bury and ____ systems.
• A ? guy is used to span across a sidewalk.
• A pole specifically installed to anchor a span guy is called a ? pole.
• A ? guy may be installed on a pole set on a steep grade.
• The One Call system eliminates all hazards from underground utilities.
• Which design feature characterizes porcelain suspension insulators?
• For which anchor is the hole size smaller than the anchor after expansion?
• The term 'safety controls' refers to extra steps taken to reduce the risk of injury if what occurs?