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Lineman Apprentice Test exams with
verified solutions 2026/
The difference in a 3 wire & 4 wire distribution circuit is? the Neutral wire What is the formula for power P=VxI Transmission voltage is generally _________ to _________. 138,000 to 765,000 volts If the diameter of the pole to be set is 10", the diameter of the hole should be ____ to allow sufficient room for tamping. 16", 3" on each side of the pole What are the component parts of a distribution system? Distribution Substation, feeder circuits, switches, protective equipment, primary circuits, distribution transformers, secondaries, services. An advantage of a Wye Primary system over a Delta primary system is? Increased power carrying capacity, better voltage regulation The total flow of current from a generating plant may be as large as __________ amps. 20, How many Amps does a 120 volt, 60 watt incandescent bulb draw? .5 amps, P=IxE I=P/E 60/120=. Thury system was generators connected in ______ to transmit ________ amps at max voltage of _______ volts? Series, 150 amps, 27,000 volts An aluminum wire must be ________ times as big as copper is a cross section to have the same conductivity.
1.66 (this means that aluminum is only 2/3 as conductive as copper) Slices should not be installed ________ ft from a tie wire or armor rod. 1 ft (12") Bolted connections may be used when? If the wires to be connected are not under tension When splicing distribution wires, how far should the line be laid out straight before splicing? 10 ft The head of a hydraulic operated tool weighs approximately ________ lbs. 15 lbs (tools operate w/ a pressure of 10,000 psi) In the process of right of way clearing, trees and brush should receive a basil spray treatment not less than ___ weeks before cutting to prevent regrowth. 2 weeks A light should be located from _____ to _____ ft over the surface of a road, less than 40' wide and from ______ to ______ ft on roads more than 40' wide. 0 - 6 ft less than 40' 6 - 12 ft over 40' When splicing Transmission conductors/wires, how far out should a conductor be laid in each direction before splicing? 40 ft from joining point During CPR, do chest compressions circulate the same amount of blood as the heart does normally? Under best conditions, only 1/3 of normal flow is accomplished. A _____ ft mast arm is used in alleys, a ________ ft mast arm is used in residential areas w/ streets less than 40 ft wide, a _____ ft is used where streets are more than 40 ft wide and in industrial/ commercial areas? 3 ft alleys 6 ft residential <40 ft 12 ft industrial >40 ft What does MOV stand for? Metal Oxide Varistor
True or False- The top of your climbers should be approximately 4 in below the inside prominence of the knee joint. False (hooks are adjustable in 1/2 in increments 14-20 inches) ____________ designed and buried a transmission system using copper rods insulated with jute. Thomas Edison Before lowering a victim to the ground, 2 rescue breathes should be given so that the throat tissue has less of a chance of swelling shut and the heart will be more likely to keep beating. Yeah do that. An ___________ ______________ when used for service entrance protection and coordination, the electric fuses provide a buffer to prevent in-plant problems on the customer system from affecting service on the utility company system. electronic fuse The location of protective devices such as PMR, are known as ______________. Coordination points (these devices protect from over current) Before installing grounds on a conductor, it should first be __________. Tested for voltage Hot line tools are factory tested at ___________ volts per foot 100, The first electric lights were called electric arc lamps and the first place they were installed was ____________. Paris, France The air we breathe has ______% oxygen. We use _____% and exhale _____%. 21% initially, 5% used, 16% exhaled Transmission and Distribution line conductors must be joined with full tension splices if the conductors are under tension. Bolted or squeeze-on connections may be used where the line is slack. True
In transmission, it is sometimes necessary to first splice steel core, then splice the outer alum wires. When finished, the outer splice is filled with _______ _________ to prevent oxidation of the splice. Zinc Chromate Automatic splice is used where one expects to have 15% of the rated breaking strength of the conductor. Tension should be applied at all times or else the jaws may release and allow the conductor to drop out. By using a popsicle, what problem is eliminated? Cold flow problems of a stranded alum conductor in a copper clamp (such as a tank ground or hot line clamp) When choosing the order of conductors when making connections, in which order should copper and alum be placed? Aluminum over copper When using armor rods, the attachment of the conductor to the insulator should be in the middle of the armor rod. What is the most commonly used and simplest tie to use? Western union Lines with less than 5,000 volts are generally covered with what different types of materials? Triple braid weather proof cotton, Neoprene, Polythene The current usually ____________ the voltage (leads or lags) Lags A wire tong is used to ____________. Hold energized wire away from work area Steel wire is a poor conductor with __________ to ___________ of the conductivity of copper. 10 - 15% Cable lube reduces the friction between the cable and duct walls by as much as _______%
Compression sleeves are mfg. for transmission line ACSR conductors that contain a gripping unit that is __________ to the aluminum sleeve. internal The power factor is usually ___________ to _________ lagging. .70 to 1. A _________ semiconductor can be used as a current rectifier. Diode The pulsating of the output voltage in a circuit can be eliminated by adding a ____________. Capacitor Voltages 69,000 to 230,0000 are classified as ________ or __________ voltages. High or Tansmission What kind of diode semiconductor can be used as a voltage reference in a an electric circuit? Zener diode 1 KW is equal to about ________ hp. one and 1/3 or 1. What are the three loading districts when talking about wire? Heavy, Medium, Light When an alternating voltage and the current that causes it to flow rise and fall at the same time, the two are said to be "in phase" and the power factor is __________. Unity Proper measurement for the D-ring size is the distance around the back of the body @ the point where the belt will be worn between the prominent points of the hip bones plus __________ inch. 1 In general, the bending radius "R" of the revers curves in the lead covered cables must be not less than _______ times the overall diameter of the cable. 8
The recommended pole setting depth for a 45 ft pole in rock is _________. (4 ft, 4.5 ft, 5 ft, or 5.5 ft) 4.5 (10%) Converter stations convert AC to DC & DC to AC using __________ ___________ ____________. Thyristor Semiconductor Devices True or False - A generator does not actually produce electricity, it merely produces an electrical pressure which causes electricity to flow. True What piece of equipment converts AC to DC? Rectifier Besides the number of high side bushings, what is the difference between a two bushing and a CSP transformer? A lack of internal fusing inside the two bushing pot. Loose sandy - gravel - type soil weighs approx. _______ lbs. a sq. ft. 100 True or False - Disconnect switches or breaker isolation switches are designed to open fault current. False (circuit breakers are designed for this operation) ________ originate in distribution substations and include the conductors and equipment necessary to distribute electricity to the customer. Distribution circuits True or False - Capacitors and transformers are nearly identical in their operation. False True or False - Grease on conductors can cause generation of corona. True What is an atom called with no free electrons? Insulator N- Type semiconductor - _________ number of electrons. Excess P - type semiconductor - __________ number of electrons.
________ are used to protect the electrical system from faults in such equipment as potential transformers or power transformers. High voltage fuses What is the standard polarity of a 14.4 transformer that is less than 200 kVA? Subtractive Explain the properties that describe a good insulator. An object with few free electrons A recloser can operate a predetermined number of times _________ to ________ and "locks out". 1 to 4 The lengths of sag sections are limited by deadends, angle structures, and terrain. What is the max length of a sag section? 4.5 miles (weather conditions including temp and wind velocity must be taken into consideration during this procees. Also, dynamometers can be used to check line tension). Secondary terminals on a transformer in order X3, X2, X1 from left to right is ________ polarity. Additive The standard taps available are on the primary winding of the transformer and are designed to provide variations in the number of windings turns in steps of ____% of the rated voltage. 2.5% Voltages over _____ volts are classified as experimental voltages. 1 million What size tie wire should be sued to tie in conductors that are #4 and smaller, 1/ to #4, larger than 1/0? #6, #4, #2 (tie wire should be soft drawn) What are the five classes of rubber goods? 0 - 4 The 5 steps to guy installation are:
Install the anchor, insert strain insulator or ground guy or both, fasten to pole, tighten guy wire and connect to anchor, mount the guy wire guard. When tying knots, the part of the rope that is looped so that the ropes lie alongside each other is called what? Bight Wire insulation is generally made of these 3 materials ________, __________, _________. Rubber, polyethylene, polyvinylchloride True or False - Arresters contain semiconductor blocks or discs that allow large currents to pass harmlessly to ground. True Feeders generally operate from ________ to ________. 2400 volts - 34,500 volts Subtransmission sunstations generate at a range of _________ to _________ and are located close to __________. 34.5 kV-69 kV, High load (urban areas) DC circuits usually consist of ________ wires. 2 wires The usual generation voltage of a generation station (power plant) is _________ to _________. 13,200 volts - 25,000 volts, also 24,000 volts The breaker in a substation is installed between the __________ & the ___________. Low voltage bus (distribution feeder voltage) & the distribution feeder circuit. True or False - Cold flow is a term used to describe load encountered when you first energize a line. False A ________ can be used in a circuit to amplify a signal. Transistor More power can be drawn from a transformer during the winter because the ambient temperature is lower.
If a power transformer does not have auto tap changing underload equipment, it is usually necessary to install _________ __________. Voltage Regulators Lightening arresters in a substation protect the sub from lightening strokes and surges from switching. What are the 3 most important factors to consider when choosing a conductor? Line voltage, mechanical strength, amount of power to be transmitted. By changing a distribution system from Delta to Wye you will increase the load carrying capacity by ______% 73% DC transmission circuits are economical whenever overhead lines extend over _____ miles, or when UG circuits extend over ______ miles. 400 OH, 20 UG A three phase transmission system requires only ______ the total weight of conductor required for a single or two phase system. 3/ True or False - Motors operating off of three-phase are much cheaper and more satisfactory than single or two phase motors. True If one transformer of a closed delta bank is removed during an outage to restore service, the remaining two can handle ______% of the original capacity. 58% ________ ________ provides high frequency voltages to be used for transmitting voice communication or telemetering signals on high voltage transmission circuits. Carrier Equipment When talking about power factor, when the lead or lag is large, the power factor is __________ and when the lead or lag is zero, the power factor is _________. Small, unity Aluminum compares to copper in the following manner: it is 2/3 as conductive as copper. Compared with a copper wire of the same physical size, alum wire has
60% of the conductivity, 45% of the tensile strength, and 33% of the weight. Alum must be 1.66 times as large as copper to have the same conductivity. An alum wire with the same conductivity as copper will have 75% the strength an 55% the weight of copper. The tensile strength of alum is only about 1/2 that of hard drawn copper. The power factor is usually between 0.70-1.00 lagging. What is the average value often taken in making calculations?
Compression tool type, self insulating, and bare connectors used for splicing stranded conductor range in sizes from ___________ to _________ for aluminum and ACSR and are normally used for secondary and services. #10-1/ What is the amount of time that the human brain can go without oxygenated blood? 4 - 5 minutes If the rotation of a three phase bank was changed, what effect would t have on the customer? It would cause any three phase equipment to rotate in the opposite direction. Over current protection of the secondary leads in a CSP transformer is provided by? Low voltage circuit breaker A fuse link is generally made from one of the following: silver, tin, lead, copper or an alloy such as tin-lead. What causes it to melt or blow? Resistance in the fuse itself, it's designed to hold a certain amount of current for a predetermined amount of time. List the classes of rubber gloves and the voltages they can be used on. Class 0 1,000 a/c, 20,000 d/c Class 1 7,500 a/c, 40,000 d/c Class 2 17,000 a/c, 50,000 d/c
600 volts To change the value of a secondary voltage, a no load tap changer on the transformer would be adjusted while the transformer is energized. (True or False) False What is the total opposition to the flow of current in a transformer called? Impedance The term roofing a pole refers to nailing a metal cap on top of the pole to help control rot. (True or False) False
