問題一覧
1
inductive reactance is measured in?
ohms
2
upon what principal does a transformer operate
mutual induction
3
maximum emf is induced when the lines of flux cut at what degree
90
4
voltage drop will ____ if the current to the load increases
increase
5
which is not a kind of electrical power
peak power
6
power factor is the ratio between _____ and_____
KW peak, KVA peak
7
lightning can have an electrical charge up to?
100 million volts
8
a ____ fault can be a dead short or potential short circuit depending on the impedance or resistance
impedance
9
fault current indicators are used on overhead and underground, FCI’s trip when?
a given current level is reached
10
to prevent tripping from down stream components FCI’s are built with a
high degree of immunity
11
when backfilling excavation what percent of compaction is needed
70%
12
tower footings must be able to withstand?
uplift and down thrust
13
one method to ground a transmission steel tower is?
counterpoise
14
when a helicopter is building a steel tower
temporary brackets
15
dampers on a transmission line are there to
resonate vibration
16
voltage drop will ___ if the current to the load increases
voltage
17
a 10ths transformer can provide 20th a for as long as
30 seconds without damage
18
a ____ sleeve leaves little to no space
conductor
19
it takes as little as 50 volts(ac) to produce 50 milliamps either can cause
fibrillation on the heart
20
a thumper operated by building a ______ charge
capacitive
21
manafactures use a ____ after the equipment has been shaped and drilled
dip galvanization
22
before stacking another piece of steel tower the bolt must be
50% in and tightened
23
one of the most dangerous situations an electrical worker may face is
phase to phase fault
24
other than a socket wrench another tool used for steel towers
spud wrench
25
an OCR controll uses
live voltage, line impedance to pin point the distance of the fault
26
two things that need to be done before using phasing equipment
make sure the phasing set works and that the lines are energized
27
always test voltage and ____ on new equipment
rotation
28
the most common way of sagging
target method
29
the KH on a meter refers to
watt hours per turn
30
backfeed can occur from
by load or induction
31
if your working on a single phase line with OCRs you should
remove the primary leads
32
xmfers are usually loaded to what percent
125%
33
xmfer losses are usually called
core and copper loss
34
proper grounding and barricading are necessary for using a
thumper