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3E051 2-3

Set 2 Book 3

QuestionAnswer
Electrical cables are installed under roadways using Concrete encased ducts
To ensure a sufficient number of spare ducts, you should allow for at least a 25 percent increase in the number of Cables
Why must ducts that terminate in a building be sealed To prevent gases and rodents from entering a building
What information is marked on manhole covers Ownership or type of utility
What is the minimum size of a constructed manhole 4 feet by 6 feet by 6 feet
The use of 90 degree bends in duct lines is permitted for Pole risers
What is the purpose of a vault Isolate electrical equipment
What type transformer is used in a vault Subway transformer
Junction boxes located in an underground vault must Provide a water tight seal
What specified percentage insulation level is used for medium voltage ungrounded cables 133 percent
The mechanical strength of underground cable is not a major concern because the cable is Not under tension
What material is used between the conductor and the cable insulation Strand shielding
When pulling cable, the snatch block and pullling rope is attached to The pulling in iron in the manhole
Which is a determining factor in the spacing between manholes Cable weight
Using he winch method, how many people does it take to pull underground cable safely 5
What term describes an underground cable that is brought up through a conduit and attached to an overhead line Riser
The device used to terminate high voltage cables is called a High voltage terminiation
What is the purpose of a cable end seal Prevents moisture from entering the cable
When making a load break elbow, before attaching the crimp connector to the cable make sure you Align the hole on the end of the connector with the equipment bushing
What is the next step after sliding the elbow over the connector and cable Thread the electrode into the connector using the wrench from the elbow kit
What combustible gases are usually found in manholes Natural gas or hydrocarbon fuels
What must you do when work takes place in a manhole that is 15 feet deep or more Use a power blower for the entire work period
Which is not a manhole ventilation method Funnel
How often must a gas test be made in a confined space Continuously
What is the approximate bending radius for underground cable 5-12 times cable diameter
For racking purposes, how much straight cable need exist on each side of a cable splice 6 inches
What type of tape is used for fireproofing underground cable in manholes Polymeric elastomer tape
What type of cable test is made after its installation but before it is placed into service Acceptance test
When you perform a maintenance test on a cable, what is the acceptable test voltage 75 percent of acceptance test voltage
Power factor tests can be performed at any voltage without exceeding the Line to ground rating of the cable
What is the easiest and quickest way to locate a cable fault Visually
When you use the MM-1 fault locator or the thumper to locate a cable fault, what signal is produced when you are over the fault loaction Fault locator signal fades out at the fault, thumper signal increases to the loudest volume
In many cases, a cable fault is located at a Splice
Which cable splice kit requires the most labor to install Conventional taped splice kit
What is the preferred method when making splices Factory pre form splice kit
What should be your first step when troubleshooting a pad mount transformer Take a complete set of secondary phase to phase and phase to ground voltage readings
If tests indicate an off ratio winding, how would you verify whether the problem was in the transformer or not Take voltage readings on the primary side of the transformer
Which airfield lights have yellow filters installed for the last 2000 feet of runway Runway edge lights
Which airfield lights provide positive identification of the beginning of the operational runway surface for approaching aircraft Threshold lights
Which airfield lights are required on all lighted runways Runway end lights
Which airfield fixture is unidirectional Approach
Which of the follwing items are found on ALSF-2 approaches 500 foot bar
What color is used for the taxiway edge light Blue
At what minimum distance from the usable landing area does a station beacon also require an identification beacon 2 miles
One of the main control panels for the airfield lights is in the vault, where is the other panel located Control tower
Approximately how far should the airfield vault be from the runway 3000 feet
What should you have available if your system uses 48 volt DC control An extra power supply module
How many conductors does the standard control cable for an airfield lighting control system contain Seven
Which airfield vault device is used to swap location of control of the airfield lights Transfer switch
What airfield lighting control system device compensates for the voltage drop from the tower to the vault Low burden pilot relay
What size cable is used for airfield light field circuits No. 8
What type of transformer is used at each airfield light fixture to avoid the problems that are normally associated with series circuits Isolating transformer
What is performed before installing a regulator Pre installation check
What size counterpoise is used for airfield lighting circuits No. 4AWG
When replacing an IL transformer, what must the first listed amperage on the IL match The maximum amperage output of the regulator
What feature is common to elevated airfield lights They are built with frangible construction
What is the primary purpose of the rotating/airport beacon To guide the pilot to the airfield
How many revolutions per minute does the airport beacon turn 6
What occurs when the operating lamp in the airport beacon fails A reserve lamp is placed in operation automatically
What voltage is necessary to run the airport beacon 120/240 volts
What is the minimum number of hazard beacons used on one side of an extensive or extremely high antenna Three
What device can be used to change voltage up or down for the airport beacon lamps The tap changer in the distribution transformer
How often must you check the level of the airport beacon base and the beacon motor's gears Annually
How often does each strobe light unit flash Twice each second
How many brightness steps is the strobe system capable of producing Three
What voltage rating is the wire that connects the flash head to the individual control cabinet 3kV
When does the hour (elapsed time ) meter operate When system is operated on high intensity
Which items still have power when CB1 in the MCC is turned off None, since this is the power disconnect breaker
How do you bypass the interlock switch on the Individual Control Cabinet Pull on the plunger
How long does it take the flash capacitors to bleed off their charge One minute
What is indicated when two skips occur within 100 flashes of the condenser discharge system A worn out lamp
Where should you start troubleshooting if you turn the strobe system on and it does nothing The source of power
Which of the following is highest priority when troubleshooting the condenser discharge system Getting the lights to flash in sequence
The check the coil of a deenergized relay, use a Ohmmeter
How are animals prevented from chewing on airfield lighting fixture cords Fixtures are designed so that no cords are exposed
What is used to maintain contact with the tower when away from the truck Hand held radios
Which approach lighting system maintenance item must be performed daily Check and record burned out lamps
When should you check all approach light fixtures for alignment Semiannually
Where is the PAPI system loacted On the left side of the runway
What calculation is used to determine the load on an airfield regulator Input current times input voltage times the regulator power factor
How often are dielectric oil tests made on airfield regulators Annually
When you tie together two airfield light circuits for emergency operation, what do you do to prevent regulator overload Move the control wire from step 5 relay to step 4 relay
In order to perform a DC hi potential test on an airfield light circuit, what do you do with the leads once you remove them from the airfield regulator Support both leads and keep them clear of each other and the ground
When using radios, which tow words should yo uuse to describe circuit conditions Open/closed
if a combination of faults exist in an airfield circuit, which faults do you clear first Grounds
Ballast voltages in multiple street light circuits usually are 120 to 480 volts
What type of light fixture should be placed near hidden entrances Security light
In an incandescent lamp, how much consumed energy is lost in the form of heat 90 percent
Which lighting system should be considered for retrofit with a more efficient system Mercury vapor
What letter represents the American National Standards Institute's special designation code for high pressure sodium lamps S
Photocells are used extensively in which type of lighting system Street lighting
To ensure that the proper amount of light is provided after fixture installation, check the lighting with a Light meter
High pressure sodium lamp cycling usually indicates The end of normal lamp life
When troubleshooting a 120 volt photocell, which conductor should provide power to the light fixture Line (black)
What lighting system practice results in reduced maintenance costs and increased saftey Group relamping