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Lineman Apprentice Test UPDATED
ACTUAL Questions and CORRECT
Answers
The difference in a 3 wire & 4 wire distribution circuit is? - CORRECT ANSWER - the Neutral wire What is the formula for power - CORRECT ANSWER - P=VxI Transmission voltage is generally _________ to _________. - CORRECT ANSWER - 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. - CORRECT ANSWER - 16", 3" on each side of the pole What are the component parts of a distribution system? - CORRECT ANSWER - 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? - CORRECT ANSWER - Increased power carrying capacity, better voltage regulation The total flow of current from a generating plant may be as large as __________ amps. - CORRECT ANSWER - 20, How many Amps does a 120 volt, 60 watt incandescent bulb draw? - CORRECT ANSWER -. amps, P=IxE I=P/E 60/120=. Thury system was generators connected in ______ to transmit ________ amps at max voltage of _______ volts? - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - 1 ft (12") Bolted connections may be used when? - CORRECT ANSWER - 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? - CORRECT ANSWER - 10 ft The head of a hydraulic operated tool weighs approximately ________ lbs. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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? - CORRECT ANSWER - 40 ft from joining point During CPR, do chest compressions circulate the same amount of blood as the heart does normally? - CORRECT ANSWER - 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? - CORRECT ANSWER - 3 ft alleys 6 ft residential <40 ft
True or False-Distribution transformers should be installed as close as possible to the center of the load that it's feeding. - CORRECT ANSWER - True A swiss engineer named _____________ developed a high voltage DC transmission system in _____________. - CORRECT ANSWER - Thury, 1899 True or False- The top of your climbers should be approximately 4 in below the inside prominence of the knee joint. - CORRECT ANSWER - False (hooks are adjustable in 1/2 in increments 14-20 inches) ____________ designed and buried a transmission system using copper rods insulated with jute. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - electronic fuse The location of protective devices such as PMR, are known as ______________. - CORRECT ANSWER - Coordination points (these devices protect from over current) Before installing grounds on a conductor, it should first be __________. - CORRECT ANSWER - Tested for voltage Hot line tools are factory tested at ___________ volts per foot - CORRECT ANSWER - 100, The first electric lights were called electric arc lamps and the first place they were installed was ____________. - CORRECT ANSWER - Paris, France The air we breathe has ______% oxygen. We use _____% and exhale _____%. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - By using a popsicle, what problem is eliminated? - CORRECT ANSWER - 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? - CORRECT ANSWER - Aluminum over copper When using armor rods, the attachment of the conductor to the insulator should be in the middle of the armor rod. - CORRECT ANSWER - What is the most commonly used and simplest tie to use? - CORRECT ANSWER - Western union Lines with less than 5,000 volts are generally covered with what different types of materials? - CORRECT ANSWER - Triple braid weather proof cotton, Neoprene, Polythene The current usually ____________ the voltage (leads or lags) - CORRECT ANSWER - Lags
Overhead secondary mains are usually installed on __________ ____________ and bolted to the pole. - CORRECT ANSWER - Vertical racks. True or False- Washing insulators should start at the top and work down. - CORRECT ANSWER - False, bottom to top Each time a cutout fails, some of the fiber inside the cutout barrel is eroded away. The larger the value of current interrupted, the more material that is consumed. - CORRECT ANSWER - __________ reduces the tensile strength of wires. - CORRECT ANSWER - Annealing Compression sleeves are mfg. for transmission line ACSR conductors that contain a gripping unit that is __________ to the aluminum sleeve. - CORRECT ANSWER - internal The power factor is usually ___________ to _________ lagging. - CORRECT ANSWER - .70 to
A _________ semiconductor can be used as a current rectifier. - CORRECT ANSWER - Diode The pulsating of the output voltage in a circuit can be eliminated by adding a ____________. - CORRECT ANSWER - Capacitor Voltages 69,000 to 230,0000 are classified as ________ or __________ voltages. - CORRECT ANSWER - High or Tansmission What kind of diode semiconductor can be used as a voltage reference in a an electric circuit? - CORRECT ANSWER - Zener diode 1 KW is equal to about ________ hp. - CORRECT ANSWER - one and 1/3 or 1. What are the three loading districts when talking about wire? - CORRECT ANSWER - 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 __________. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - 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) - CORRECT ANSWER - 4.5 (10%) Converter stations convert AC to DC & DC to AC using __________ ___________ ____________. - CORRECT ANSWER - Thyristor Semiconductor Devices True or False - A generator does not actually produce electricity, it merely produces an electrical pressure which causes electricity to flow. - CORRECT ANSWER - True What piece of equipment converts AC to DC? - CORRECT ANSWER - Rectifier Besides the number of high side bushings, what is the difference between a two bushing and a CSP transformer? - CORRECT ANSWER - A lack of internal fusing inside the two bushing pot. Loose sandy - gravel - type soil weighs approx. _______ lbs. a sq. ft. - CORRECT ANSWER - 100 True or False - Disconnect switches or breaker isolation switches are designed to open fault current. - CORRECT ANSWER - False (circuit breakers are designed for this operation)
DC cable insulation must be thick enough to provide a safety factor of ______ to ______. - CORRECT ANSWER - 3 to 5 True or False - The primary or high voltage side of a transformer (OH/UG) has a high electric pressure and the current is large. The secondary or low side has a low pressure and the current is small. - CORRECT ANSWER - False (High side has high pressure and low current. The low side has low pressure and high current) Insulink splice colors: - CORRECT ANSWER - #10=brown, #6=blue, #4=orange, #2=red, 1/0=yellow, 4/0=pink What is the breaking strength of 5/16 utility grade guy wire? - CORRECT ANSWER - 6,000 lbs ________ are used to protect the electrical system from faults in such equipment as potential transformers or power transformers. - CORRECT ANSWER - High voltage fuses What is the standard polarity of a 14.4 transformer that is less than 200 kVA? - CORRECT ANSWER - Subtractive Explain the properties that describe a good insulator. - CORRECT ANSWER - An object with few free electrons A recloser can operate a predetermined number of times _________ to ________ and "locks out". - CORRECT ANSWER - 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? - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - 2.5% Voltages over _____ volts are classified as experimental voltages. - CORRECT ANSWER - 1 million What size tie wire should be sued to tie in conductors that are #4 and smaller, 1/0 to #4, larger than 1/0? - CORRECT ANSWER - #6, #4, #2 (tie wire should be soft drawn) What are the five classes of rubber goods? - CORRECT ANSWER - 0 - 4 The 5 steps to guy installation are: - CORRECT ANSWER - 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? - CORRECT ANSWER - Bight Wire insulation is generally made of these 3 materials ________, __________, _________. - CORRECT ANSWER - Rubber, polyethylene, polyvinylchloride True or False - Arresters contain semiconductor blocks or discs that allow large currents to pass harmlessly to ground. - CORRECT ANSWER - True Feeders generally operate from ________ to ________. - CORRECT ANSWER - 2400 volts - 34,500 volts Subtransmission sunstations generate at a range of _________ to _________ and are located close to __________. - CORRECT ANSWER - 34.5 kV-69 kV, High load (urban areas) DC circuits usually consist of ________ wires. - CORRECT ANSWER - 2 wires
When voltage is applied to a conductor the free electrons do what? - CORRECT ANSWER - Flow in one direction Circuit Switcher - operation of circuit switchers is initiated by manually operating switch, by a remote supervisory control, or by relays that automatically sense predetermined system or equipment conditions or electrical failure (faults). - CORRECT ANSWER - True or False - Voltages of 1 million volts or more are classified as ultra-high voltages or experimental voltages. - CORRECT ANSWER - True The optimum insulating SF6 gas pressure is _________ psig. - CORRECT ANSWER - 50 psig True or False - Large single phase motors have a much smaller drain on voltage at start up than do three- phase motors. - CORRECT ANSWER - False Alumoweld guy cable, seven-strand #8 has a minimum breaking strength of _______ & #% has a breaking strength of _________. - CORRECT ANSWER - #8 - 15, #5 - 27, If a power transformer does not have auto tap changing underload equipment, it is usually necessary to install _________ __________. - CORRECT ANSWER - Voltage Regulators Lightening arresters in a substation protect the sub from lightening strokes and surges from switching. - CORRECT ANSWER - What are the 3 most important factors to consider when choosing a conductor? - CORRECT ANSWER - 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 ______% - CORRECT ANSWER - 73% DC transmission circuits are economical whenever overhead lines extend over _____ miles, or when UG circuits extend over ______ miles. - CORRECT ANSWER - 400 OH, 20 UG
A three phase transmission system requires only ______ the total weight of conductor required for a single or two phase system. - CORRECT ANSWER - 3/ True or False - Motors operating off of three-phase are much cheaper and more satisfactory than single or two phase motors. - CORRECT ANSWER - 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. - CORRECT ANSWER - 58% ________ ________ provides high frequency voltages to be used for transmitting voice communication or telemetering signals on high voltage transmission circuits. - CORRECT ANSWER - 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 _________. - CORRECT ANSWER - 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. - CORRECT ANSWER - The power factor is usually between 0.70-1.00 lagging. What is the average value often taken in making calculations? - CORRECT ANSWER - 0. 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. - CORRECT ANSWER - #10-1/ What is the amount of time that the human brain can go without oxygenated blood? - CORRECT ANSWER - 4 - 5 minutes
The minimum ground clearance on a secondary service for voltages ranging from 0 to 750 volts in areas restricted to pedestrian traffic is _________ feet. - CORRECT ANSWER - 12 feet Underground services to new homes are usually installed with 2/0 aluminum conductor or larger to provide a service capable of delivering how many amps? - CORRECT ANSWER - 200 amps After driving a ground rod you should check the resistance with an ohm meter. If the resistance is not below _________ ohms, one should be added on top or another rod should be driven beside the existing one. - CORRECT ANSWER - 25 ohms or less In the United States & Canada A/C power is generated at __________ Hz (hertz or frequency) - CORRECT ANSWER - 60 Hz Protective grounds protect the line worker from what types of hazards? - CORRECT ANSWER - Static charges, accidental energizing, induced voltage. System voltages of ________ volts or less are classified as low voltages or utilization voltages. - CORRECT ANSWER - 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) - CORRECT ANSWER - False What is the total opposition to the flow of current in a transformer called? - CORRECT ANSWER - Impedance The term roofing a pole refers to nailing a metal cap on top of the pole to help control rot. (True or False)
