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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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when using a voltmeter to measure an unknown voltage, which range do you select?   show
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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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show Clamp-on ammeter  
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show one  
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show C-B-A  
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show 24 hours  
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When the rotation per minute of a motor using a stroboscope tachometer is adjusted, the pattern   show
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What meter is used to locate higher-than-normal temperatures of conductors and electrical connections?   show
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What tester is used to verify the atmospheric condition inside a manhole before you enter?   show
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show 2.3 kV to 80 kV  
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show 6 months  
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What is the maximum ohmic reading for static grounds according to current Air Force directives?   show
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show 25 ohms  
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show Resistor or reactor  
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show Copper-clad steel  
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show Electrolytic plates  
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What is the approximate percentage of the total resistance that can be found within on foot of a ground rod?   show
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Which is the preferred method of obtaining a better ground?   show
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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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What are the minimum requirements for the depth and length of a facility ground ring?   show
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show 8 feet long; copper-clad steel  
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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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Isolated ground receptacles are used in circuits feeding electronic devices to   show
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In an isolated ground (IG) receptacle, the   show
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show The circuit breaker for that circuit trips  
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Physical failure of grounding systems usually occurs in which portion of the system?   show
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show Shield and core grounded to the enclosure  
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show A higher phase to neutral voltage  
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show ionization  
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show 24  
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The main counterpoise is installed beyond the building perimeter at not less than   show
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Lightning grounds are designed   show
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show No. 1/0 AWG  
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The maximum spacing, in feet, between air terminals is   show
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What is the minimum radius, in inches, that lightning protection conductors bend?   show
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Grounding of lightning protection systems should conform to   show
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show 25  
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show 6 AMG  
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What size grounding rods are used in a lightning protection system?   show
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show To same elevation as counterpoise below finished grade.  
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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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The shortest length a radial system of grounding conductors extend away from a grounding connection is not less than   show
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show Clean dry surfaces in low humidity; can hold their charge.  
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What is the minimum sparking voltage generally accepted for the shortest measurable length of gap?   show
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show 1500 volts  
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Unwanted electrical charges in hazeardous areas are dissipated by using   show
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Which size copper wire is used to bond conductive objects when they are not concealed or mechanically protected?   show
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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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show 1/4 to 3/8-inch galvanized guy wire  
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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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show 3/4 inch by 2 feet  
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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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How often are liquid fuel maintenance personnel required to check grounding systems for fill stands and fuel dispensing areas?   show
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What needs to be done if fuel maintenance personnal find excessive amounts of corrosion on ground connections?   show
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What are the minimum size requirements for a ground rod used for lightning protection?   show
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What is the minimum size conductor that is used for a ground loop?   show
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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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show 2  
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show Radials  
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What are the grounding requirements for a facility that handles explosive materials?   show
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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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A pole supporting overhead ground wires must provide clearance above the highest part of the facility of at least   show
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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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Which wire is used for fault protection of a facility?   show
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show 20 feet  
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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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show every 7 months for visual inspection; every 14 months for continuity and resistance test  
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