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3E051 Set C Book 3

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
A meter in an electrical circuit measures electrical   show
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show Highest  
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Polarity must be observed when measuring coltage in   show
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show a lower range  
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A full-scale reading on an ohmmeter is   show
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show 500 to 1,000 volts  
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Which meter measures current flow in an electrical circuit?   show
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How many conductors must a clamp-on ammeter encircle to obtain an accurate current reading?   show
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Which phase sequence would cause a motor to spin in the opposite direction of the other three?   show
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show 24 hours  
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show appears to stand still  
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show infrared detector  
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show Gas detector  
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What is the voltage range os a high-voltage phase tester?   show
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show 6 months  
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show 10,000  
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show 25 ohms  
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Which of the following is frequently used to limit ground fault current to a manageable level in circuits of 1 kV to 15 kV   show
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What type of ground rod is most often used for grounding electrical systems?   show
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Which items are not parts of the lightening protection system?   show
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show 68  
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show Deeper ground rod penetration  
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Which article of the National Electrical Code covers grounding?   show
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show 20K  
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show At a distance not to exceed 1/4 mile  
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The metal frame of a building can be used as a facility ground   show
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show 2 1/2 feet deep; 20 feet long  
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What are the requirements for a facility ground rod?   show
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show Noise pickup and high-frequency  
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Which grounding systems are needed for the grounding of computer equipment?   show
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show reduce noise  
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show grounding pin is purposely insulated from the outlet box  
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show The circuit breaker for that circuit trips  
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show Just above and below ground level  
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How must an isolation transformer be grounded to the transformer enclosure?   show
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Which of the following is not an effect of ground-neutral reversal in an interior wiring system?   show
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The process of separating air molecules into positive ions and negative electrons is called   show
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show 24  
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show 3 nor more than 8 feet  
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show to handle high current  
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What is the minimum size grounding conductor used for hazardous locations?   show
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show 25  
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show 8  
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show NFPA 780  
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show 25  
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show 6 AMG  
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show 10 feet in lenth, and a 3/4-inch diameter  
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When ground rods are used with a counterpoise, how deep are ground rod tops driven?   show
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What is the minimum depth, in inches, below the earth's surface that a counterpoise will be installed around a facility?   show
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show 12 feet long  
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What are the properties of good insulators?   show
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What is the minimum sparking voltage generally accepted for the shortest measurable length of gap?   show
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At what voltage can a static charge ignite gasoline?   show
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Unwanted electrical charges in hazeardous areas are dissipated by using   show
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show No. 6 AWG copper wire.  
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On above ground fuel tanks that rest on the earth, ground rods are required if the resistance to earth exceeds   show
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If an above ground fuel tank is to be grounded, what size and type-grounding conductor must be used?   show
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show 5/8-inch by 8-foot galvanized steel  
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If a fence has a 2,400-volt overhead line crossing over it, ground the fence at a distance not to exceed   show
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With what type of conductor must a fuel storage area fence and gate be bonded?   show
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If railroad tracks extend to within 100 feet of fuel dispensing stands, the rails are   show
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show 8-foot galvanized-steel rod driven 2 inches below the surface of the apron  
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What size stranded copper bonding cable must be used to bond driven ground rods for hydrant outlets?   show
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show the static ground is connected to the hangar's electrical system ground  
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What is the minimum siaze ground rod that can be used in a hangar floor?   show
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How many grounding receptacles per aircraft space are used in hangars that house a specific number and type of aircraft?   show
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show monthly  
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show cathodic protection  
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What are the minimum size requirements for a ground rod used for lightning protection?   show
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show No. 1/0 AWG  
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What is the minimum size copper conductor that can be used for lightning protection in an overhead wire system?   show
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For lightning protection, air terminals near vents that emit explosive gas must be at least how many feet long and extend at how many feet above the vent?   show
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What is the minimum number of down conductors that are used to provide lightning protection to a facility?   show
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What type of grounding system must be installed when ground rods cannot be driven due to the soil condition?   show
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show statice, equipment, and lightning ground subsystems are tied together  
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What is the maximum ohmic requirement for a military communication facility ground subsystem?   show
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show 60  
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show 6  
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show 1:1  
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show 6 feet  
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The minimum number of inches the radius of a bend in a down conductor can have is   show
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What is the main disadvantage of a valve-type arrester?   show
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show green insulated  
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A tower and a communication facility must be enclosed by the same ground loop if they are spaced no farther apart than   show
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show the presence of voltage in the circuit  
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show deficiencies found, corrective action and date of repair  
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What instruments are used when testing grounding systems?   show
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What is the frequency required for visual, continuity and resistance checks for hazardous explosive areas (weapon storage)?   show
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