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Apprentice Lineman General Knowledge
Questions with Correct Answers.
What year was the IBEW formed, and who was its President? 1890, Henry Miller What should be checked for when examining as injured person?
- Breathing
- Pulse
- Head Injury
- Paralysis on one side of the face
- Laryngectomee
- Stains and burns on or around mouth What is shock? A depressed state of all body functions due to failure of the circulatory system. What are some signs of shock?
- Increased shallow breathing
- Cold clammy skin
- Low body temperature
How should shock be treated?
- 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? Direct pressure on pressure point and in extreme cases tourniquet. What is artificial respiration? The forcing of air into the lungs of one who cannot breathe for himself. How deep should a gain be cut? 1/2" Poles set on curves, corners, and strain points should be set __________ inches deeper. 6
Is there such a thing as a perfect insulator? no The opposition to current flow through a material is called? resistance What is the unit of measurement of resistance? Ohm What is the resistance of 1000 feet of #10 copper? 1 Ohm What is electric current? The definite drift of electrons from a point of negative potential to a point of positive potential. The unit of measurement of electromotive force is the: Volt
The unit of current flow is: Ampere In a circuit the current is __________ proportional to the voltage and __________ proportional to the resistance. directly, inversely The __________ at which work is done is power. The formula for this is: rate, Power = Work ÷ Time One joule of work done in one second of time is one __________ of electrical work. Watt The unit of electrical work is the __________? Joule
What is the speed of light? 186,000 miles per second What NECA district covers outside work exclusively? Tenth District What is a guy? 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? 60%, 45%, 33% One mill is equal to __________ of an inch? 1/ How do you find the circular mil cross section area of a wire? Square the diameter of the wire in mills.
What is the mathematical expression for series resistance? Rt = R₁ + R₂ + R₃ + R₄... A circuit having only one current path is called a __________ circuit? series What is the formula for determining the total current in a series circuit? It = I₁ = I₂ = I₃ = I₄... Electrical energy is transformed into __________ when current flows through a resistor. heat What is the formula for power in a series circuit? Pt = P₁ + P₂ + P₃ +P₄... What is the formula for voltage in a parallel circuit?
The sheet iron core of a transformer forms a closed: magnetic circuit How are the primary and secondary windings of a transformer coupled? magnetically What is the formula for number of windings to voltage? voltage primary/voltage secondary = number of turns primary/number of turns secondary What destroys transformers in an overload situation? heat The purpose of oil in a transformer is: cool and insulate the coils What keeps a transformer from acting as a short circuit? Counter voltage (aka: back voltage, CEMF)
What is usually the maximum temperature the insulation in a transformer can stand? 221° F (105° C) Why are underground transformers and their bushings hermetically sealed? To guard against moisture damage. What does a CSP transformer have that a conventional does not?
- 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? R = (K x L) ÷ A Where: R = resistance K = specific resistance L = length of wire in feet A = circular mil area
What term represents the amount of current multiplied by the specific coil? Ampere-turns Name three methods used to cool transformers?
- Oil
- Air
- Water How many hertz are used in AC in the United States? 60 Hz What are two types of instrument transformers? Current & Potential Transformers of less that 500 kva are called __________ transformers. distribution
- some texts use 200 kva, others 100 kva Transformers of 500 kva and larger are known as __________ transformers.
power
- some texts use 200 kva, others 100 kva How many windings does an auto-transformer have? 1 What ratio does an auto transformer usually have? 2: Primary metering requires both __________ transformers and __________ transformers. potential, current Current transformers are connected in __________ with the load. series In a large-sized generator which conductors spin and which remain stationary? The armature conductors are stationary and the poles revolve.
Name four ways that electric shock may effect the human body?
- Asphyxia
- Burns
- Fibrillation
- Muscle Spasm What precaution must be taken when freeing a victim from energized lines? That is is deenergized Which way does electric current flow? negative to positive (Electron Current Flow) ...older texts used Conventional Current Flow (positive to negative) aka: Hole Flow, Positive Current Flow Earth resistance is largely determined by what two conditions?
- Chemical ingredients in the soil
- Moisture present
__________ percent of the resistance surrounding an electrode is within a radius of 6' to 10' from an electrode. 90 Ground rods should be long enough to reach __________ moisture level of the soil? permanent Codes require that the resistance of a driven ground shall not exceed __________ ohms. 25 Grounds for lightning arrestors should be __________ than 25 ohms. less What are the two types of counterpoise grounding?
- Continuos (parallel)
- Crowfoot (radial) List two methods to test that the line is dead before installing protective grounds?
- Rated and calibrated high voltage volt meter
When the overload circuit breakers are open, the: primary is still energized What is the purpose of line hose? To protect lineman from accidental contact. What is the maximum depth of an excavation without the use of shoring? 4' Material and debris shall not be placed within how many inches of an open trench in which a man can work? 18" What are the two types of underground cable?
- Shielded
- Non-shielded Non-shielded cable use is restricted to what voltage?
