C7 test Flashcards
How is a fiber optic cable terminated?
568SC
What does VOM stand for?
Volt Ohmmeter
What does ACV stand for?
Alternating current voltage
What does DCV stand for?
Direct current voltage
How should you install vertical cables
start at the top and pull down, then tie from the top down
A low voltage contractor can install equipment carrying a maximum of
91 volts
What is the maximum number of jacks that can be installed on a single gan faceplate?
6
what is the max bending radius for fiber optic cable
20 times the diameter
how far into a building can a flooded cable be run before it must be terminated
50 feet
what is the max pulling tension for CAT 5 cables
25 lbs
what is the typical max pulling tension for indoor fiber optic cables
100 lbs
what is the typical max pulling tension for outdoo fibe cable
600 lbs
what is the best method for splicing singlemode fiber
fusion splice with strain relief boot
What is the best method for splicing multimode fiber
mechanical alignment sleeve with index matching gel
what is a core drill
a hollow drill used to remove section of material
when can overhead communicartion lines be installed on a cross member that has high viltage lines attached
never
which of the followin is most approprate to fight electral fire
Co2
for which of the following would you use a spade bit
wood
when dealing with tempoirary power at a job site, what precaitionary steps need to be taken
it should be installed so that it is protected from physical damage
what is the max height a worker may be ex[osed to before a sagety harness is required
15 feet
when placing a connector on a cat 5 cable, how much of the cable jacket can be stripped back
only as much as you need
when placing a connector on a CAT 5 cable , how far may the wir pairs be untwisted
.5”
what are the three ost common cental office cabling systems
UTP, STP and fiber optics
as a general rule, what is the min bending radius of conduits 1 “ and larger
6 times the diameter
what connecting audio cable, what is the red connector
right audio
when connecting audio cables, what is the white connector used for
left audio
what is the min heigh over a residential driveway
12’
what is the smallest speaker
tweeter
what is typically found in floors in CA
Asbestos
What is typiclly found in electrial light ballasts in CA
PCB (polycyclorinated biphenyls)
what do you not do when you test fiber optic with OTDR
look in the other end
what is the min ovelap of an extension ladder
36”
what type of jack should be used on a CAT 5 100MHZ cable installation
RJ45
what do you do whith materails if you are done with them
mover them out of the way to keep the are clean, uncluttered and safe
where should you keep the brooms and shovels on a jobsite
in a place safe to get to
what does ADA compliant refer to
contracors followed American with Disabilities Act codes and requirements
what should you do when you are finished with your power tools
wait until all motion has stopped before leaving the machine
1/4 scale refers to
4’- 1”
you are wiriing inside a manhole that is 6’ x 12’ and 7’ form floor to ceilling. Is this situation allowed
yes
what is the 15th pair in 24 pair cable
black/slate
what is the 25th pair in 25 pair cable
violet/slate
which is the following should you take into consideration when running low voltage wiring
electomagnic interference
which of the following is used for horizontal cabling
CAT5, Fiber Optic cable, shielded Twisted Pair
the network ground connection for low voltage systmes should
be grounded at the main electrical panel
which of the following shoudl you do before enering a confined space
test the air inside the area
how many pairs are in backbone cabling
25
what can be done make pulling long runs of wire though conduit
use lube
what gauge wire is used to ground telecommunication cable and equipment
6 AWG
what color is used for the first pair when installing telephone lines
blue
what material is most commonly used a backing to mount teminatin blocks
plywood
when should look into the end of active optic fiber
never
if you deviated form the plans , you must make a note of the change on a separte set of plans.
as builts
which is the folloing is used to support telephone wires
channel molding
what type fo fire extingusihser should not be used on an electical fire
H20
what should you do whith a broken drill
tag it as broken and remove it from the jobsite
what is the propoer way to lift a tool
by the handle
what is the total impedance of five 8-ohm speakers connected in series
40 ohms
what is the total impedance of five 8-ohm spekers connected in parallel
1.6 ohms
what is considered to be the most dangerious in electrical shock
amps
which has the greatest potential to cause harm 600 v or 24 V
both have the same potential
when running low voltage wiriing through a fire wall, how do you seall the opening
intmescent fire stop
how do you atach wired in a teminal block
puch down tool
what is the max lenghth of a horizonal cross connectionect
5 m
what is the power rating of a circuit that has a voltage of 10 volts and a resistatnce of 12 ohms
8.3 watts
where should the key be kept when equiptment is locked out and subcontractor is involved
on the direct person of subcontractor
what is the max stripping for coaxial cable when teminating coaxial cable F connectors
1/2 in
what is the max working lengh for a 40’ exentsion ladder
36’
what shoudl you do if have one shielded cable that eners two building
gound both ends in both buidlings
during excavation, how far from the edge must excaved spoils be deposited
2’
what is the max lengh for a fall protection harness
6’
when shoudl an employer give instruction on fail hazards
immediately
when do you connect a safty harness
back shoulder
what is the min amounbt a saftery should hold
5,000 lbs
when should fall retrain systms be inspected
twice per year
in clay soil, how deep can a trench be before it requires shoring
5’
at what depth is a ladder required for worker access
4’
what is the max width of a trench before a bridge is required
30’
what wire should be used to cross connect a stradard telephone connections
24 AWG
what tyoe of jack should be used on a Cat 6 cable installation
RJ-45
what is the max span allowed for scaffold planking
10 feet
what is the max vertical height for a medium-duty tube and couple scaffold
125’
what is the smalled width allowed for scaffold planking
10”
what is metal scaffold designed for
live loads, wind loads, dead loads
what is the min a max heigh of scaffold guardrail
42”
what is the max overhang of scaffold plank
18”
