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Apprentice Lineman General Knowledge Questions
with Complete Solutions
What year was the IBEW formed, and who was its President? Correct Answer-1890, Henry Miller What should be checked for when examining as injured person? Correct Answer-1. Breathing
- Pulse
- Head Injury
- Paralysis on one side of the face
- Laryngectomee
- Stains and burns on or around mouth What is shock? Correct Answer-A depressed state of all body functions due to failure of the circulatory system. What are some signs of shock? Correct Answer-1. Increased shallow breathing
- Cold clammy skin
- Low body temperature How should shock be treated? Correct Answer-1. Maintain normal body temperature
- Ensure adequate oxygen supply
- Keep warm
- Control bleeding if necessary lie down with head lower than feet
- Do not move unless necessary What are ways to control bleeding? Correct Answer-Direct pressure on pressure point and in extreme cases tourniquet. What is artificial respiration? Correct Answer-The forcing of air into the lungs of one who cannot breathe for himself. How deep should a gain be cut? Correct Answer-1/2" Poles set on curves, corners, and strain points should be set __________ inches deeper. Correct Answer- If a pole is set near an energized line what precautions should be taken? Correct Answer-1. Cover with protective equipment
- Feeder holds
- Rubber gloves Wood poles are classified by their: Correct Answer-1. Height
- Top circumference
- Circumference 6' from the bottom of the pole
The unit of current flow is: Correct Answer-Ampere In a circuit the current is __________ proportional to the voltage and __________ proportional to the resistance. Correct Answer-directly, inversely The __________ at which work is done is power. The formula for this is: Correct Answer-rate, Power = Work ÷ Time One joule of work done in one second of time is one __________ of electrical work. Correct Answer-Watt The unit of electrical work is the __________? Correct Answer-Joule The unit of electrical power is the __________? Correct Answer-Watt __________ is the unit of measurement of work for mechanical power. Correct Answer-Horsepower What is the most common cause for lost power? Correct Answer-heat How many watts are in one horsepower? Correct Answer-
One watt equals __________ horsepower? Correct Answer-. What is a watts definition? Correct Answer-The power used when one amp flows with one volt. What is the speed of light? Correct Answer-186,000 miles per second What NECA district covers outside work exclusively? Correct Answer- Tenth District What is a guy? Correct Answer-A brace or cable fastened to strengthen a pole and to keep it in position. Aluminum has what conductivity, tensile strength, and weight of copper? Correct Answer-60%, 45%, 33% One mill is equal to __________ of an inch? Correct Answer-1/ How do you find the circular mil cross section area of a wire? Correct Answer-Square the diameter of the wire in mills. What is the mathematical expression for series resistance? Correct Answer-Rt = R ₁ + R ₂ + R ₃ + R ...₄
What is produced when a conductor is moved through magnetic lines of force? Correct Answer-an EMF is induced A device used to convert AC power from one combination of voltage and current to another is called a __________? Correct Answer- transformer The sheet iron core form a closed: Correct Answer-magnetic circuit How are the primary and secondary windings of a transformer coupled? Correct Answer-magnetically What is the formula for number of windings to voltage? Correct Answer-voltage primary/voltage secondary = number of turns primary/number of turns secondary What destroys transformers in an overload situation? Correct Answer- heat The purpose of oil in a transformer is: Correct Answer-cool and insulate the coils What keeps a transformer from acting as a short circuit? Correct Answer-Counter voltage (aka: back voltage, CEMF)
What is usually the maximum temperature the insulation in a transformer can stand? Correct Answer-221° F (105° C) Why are underground transformers and their bushings hermetically sealed? Correct Answer-To guard against moisture damage. What does a CSP transformer have that a conventional does not? Correct Answer-1. Primary lightning arrestor
- Primary protective fuse link
- Overcurrent protection on secondary
- Overload Signal lamp
- External Operating handle for opening and closing secondary
- No load tap changer What is the formula for resistivity of a wire? Correct Answer-R = (K x L) ÷ A Where: R = resistance K = specific resistance L = length of wire in feet A = circular mil area What are the specific resistance's of copper and aluminum? Correct Answer-Copper (Cu) 10. Aluminum (Al) 17.
What are two types of instrument transformers? Correct Answer-Current & Potential Transformers of less that 500kV are called __________ transformers. Correct Answer-distribution Transformers of 500kV and larger are known as __________ transformers. Correct Answer-power How many windings does an auto-transformer have? Correct Answer- What ratio does an auto transformer usually have? Correct Answer-2: Primary metering requires both __________ transformers and __________ transformers. Correct Answer-potential, current Current transformers are connected in __________ with the load. Correct Answer-series In a large-sized generator which conductors spin and which remain stationary? Correct Answer-The armature conductors are stationary and the poles revolve.
What should be done to rubber gloves each time they are used? Correct Answer-Visually inspected, air tested, check for proper voltage (dielectric strength), check for ozone cutting and mechanical damage. What current are constant current transformers usually fixed at? Correct Answer-6.6 amps Which winding on a constant current transformer is moveable, primary or secondary? Correct Answer-secondary What moves the windings apart on a constant current transformer? Correct Answer-magnetic repulsion What type of series street light circuit uses only one wire? Correct Answer-open loop Why is filler paste injected into the sleeve? Correct Answer-To prevent oxidation to the splice. Name four ways that electric shock may effect the human body? Correct Answer-1. Asphyxia
- Burns
- Fibrillation
- Muscle Spasm
What are the two types of counterpoise grounding? Correct Answer-1. Continuos (parallel)
- Crowfoot (radial) List two methods to test that the line is dead before installing protective grounds? Correct Answer-1. High voltage volt meter
- Fuzzing What does a good ground require? Correct Answer-1. Low resistance path to ground
- Clean tight connections made at proper points
- Adequate current-carrying capacity of grounding equipment. Where will the primary fuse on a CSP be located? Correct Answer- Inside the tank between the primary coil and the primary bushing. The overcurrent protective device on a CSP transformer is located where? Correct Answer-On the secondary side inside the tank between the secondary bushing and the secondary coil. Does the red warning light on a CSP transformer mean that an overcurrent exists now? Correct Answer-No When the overload circuit breakers are open, the: Correct Answer- primary is still energized
What is the purpose of line hose? Correct Answer-To protect lineman from accidental contact. What is the maximum depth of an excavation without the use of shoring? Correct Answer-4' Material and debris shall not be placed within how many inches of an open trench in which a man can work? Correct Answer-18" What are the two types of underground cable? Correct Answer-1. Shielded
- Non-shielded Non-shielded cable use is restricted to what voltage? Correct Answer- 7200 Aluminum conductors can be damaged by __________. Correct Answer-cold flow & galvanic action On a transformer hooked single phase to obtain the higher voltage the secondary must be connected? Correct Answer-series To obtain the lower voltage you must connect the secondary coil in __________? Correct Answer-parallel
Which principle does a transformer operate on? Correct Answer-mutual induction What is it called when a change of current in a coil induces an EMF in the same coil? Correct Answer-self induction The direction of flow of an induced EMF is always in which direction? Correct Answer-The direction that opposes the change of current that caused it. When a conductor is moved through magnetic lines of force what happens? Correct Answer-An EMF is induced A straight line drawn from the center of a circle to its outer edge is called the __________. Correct Answer-radius A straight line drawn through the center of a circle that touches the circle in two places is called what? Correct Answer-diameter The distance around a circle is called the __________. Correct Answer- circumference What is the formula to find the circumference of a circle? Correct Answer-C = 3.14 x D
Where: D = diameter of circle What is the formula to find the Area of a circle? Correct Answer-A = 3.14 x R² Where: R = radius of circle To prevent a series circuit from being completely interrupted by a burn out of one lamp, __________ __________ __________ are used. Correct Answer-film disk cutout What should always be done before opening a series circuit? Correct Answer-Drop load and take out of service. If raising a transformer causes temporary excessive strain to the pole what should be done? Correct Answer-Install a temporary guy As a rule what polarity are distribution transformers? Correct Answer- Additive (below 200kVA & below 8,660 V) What protects direct burial cable from: moisture, gases, chemicals, and mechanical injury during installation? Correct Answer-sheathes What are sheathes made of? Correct Answer-plastic or lead
The voltage across transformer windings when connected wye is: Correct Answer-winding voltage = line voltage ÷ 1. How does winding current compare with line current when transformers are connected wye? Correct Answer-line current = winding current To convert an underground cable to an overhead line requires _________ and a __________. Correct Answer-riser, pothead If an underground riser is low voltage it terminates in a __________ __________. Correct Answer-weather head If the termination is high voltage it terminates in a _________. Correct Answer-pothead Name two types of potheads? Correct Answer-1. one conductor
- three conductor How is a pothead attached to the sheath of the cable? Correct Answer- wiped joint or a clamping joint What is the purpose of a pothead? Correct Answer-To separate conductors and to seal out water.
What is another name for galvanic action? Correct Answer-electrolysis What determines how the secondary of a bank is hooked up? Correct Answer-customer demands What are the formulas for finding the capacity of an open bank? Correct Answer-57.7% of total closed bank, or 86.6% of remaining cans What should be hooked up first when installing a transformer on transformer bank? Correct Answer-grounds and then neutral What are the three ways to sag a conductor? Correct Answer-1. Dynamometer
- Timing mechanical waves with a unisagwatch
- Transit What are the four principle types of electric discharge lamps? Correct Answer-1. Sodium
- Mercury vapor
- Halide
- Florescent
