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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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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