2-5 MO VALLEY UPDATED ACTUAL Questions and CORRECT
Answers
The NEC's definition of medium voltage ranges from ? to a.
?. 2,001 V / 35,000 V
a.
2,001 V / 35,000 V
b.
4,160 V / 42,000 V
c.
7,200 V / 66,000 V
d.
12,470 V / 69,000 V
From a technical standpoint, heating conditions that True
influence the choice of cable include the ambient
temperature, the proximity of other cables, adjacent heat
sources, and the thermal conductivity of the soil it will be
buried in.
T/F
,The purpose of applying strand shielding between the c.
conductor and the insulation of the cable is to eliminate ? voltage stress
in air voids at the interstices between the conductor and
the cable insulation.
a.
carbon buildup
b.
heat
c.
voltage stress
d.
water
? insulation offers excellent resistance to ozone and a.
weathering and has good low temperature properties, EP
good heat resistant properties, and excellent electrical
properties.
a.
EP
b.
PILC
c.
Thermoplastic
d.
XLP
On cable circuits where the clearing time requirements of b.
the 100% level category cannot be met and there is 133%
adequate assurance the faulted section will be
deenergized in a time not exceeding one hour, cable
with a ? insulation level should be used.
a.
85%
b.
133%
c.
173%
d.
225%
, Insulation shielding of medium voltage cable helps to b.
prevent high stress and ? by distributing the stress evenly possible corona
throughout the entire insulation structure.
a.
EMF pulses
b.
possible corona
c.
radio noise
d.
treeing
When moisture fills the very fine electric stress lines that d.
occur at voids and other insulation irregularities on a water treeing of the insulation
cable and spread towards the outer edge, it is known as ?
.
a.
current stress breakdown
b.
sharp bending damage
c.
static discharge damage
d.
water treeing of the insulation
Rubber gloves shall be worn continuously while working b.
on any structure carrying live conductors. This is known ground to ground
as the ? rule.
a.
assured safety
b.
ground to ground
c.
safety assurance
d.
zero potential
Answers
The NEC's definition of medium voltage ranges from ? to a.
?. 2,001 V / 35,000 V
a.
2,001 V / 35,000 V
b.
4,160 V / 42,000 V
c.
7,200 V / 66,000 V
d.
12,470 V / 69,000 V
From a technical standpoint, heating conditions that True
influence the choice of cable include the ambient
temperature, the proximity of other cables, adjacent heat
sources, and the thermal conductivity of the soil it will be
buried in.
T/F
,The purpose of applying strand shielding between the c.
conductor and the insulation of the cable is to eliminate ? voltage stress
in air voids at the interstices between the conductor and
the cable insulation.
a.
carbon buildup
b.
heat
c.
voltage stress
d.
water
? insulation offers excellent resistance to ozone and a.
weathering and has good low temperature properties, EP
good heat resistant properties, and excellent electrical
properties.
a.
EP
b.
PILC
c.
Thermoplastic
d.
XLP
On cable circuits where the clearing time requirements of b.
the 100% level category cannot be met and there is 133%
adequate assurance the faulted section will be
deenergized in a time not exceeding one hour, cable
with a ? insulation level should be used.
a.
85%
b.
133%
c.
173%
d.
225%
, Insulation shielding of medium voltage cable helps to b.
prevent high stress and ? by distributing the stress evenly possible corona
throughout the entire insulation structure.
a.
EMF pulses
b.
possible corona
c.
radio noise
d.
treeing
When moisture fills the very fine electric stress lines that d.
occur at voids and other insulation irregularities on a water treeing of the insulation
cable and spread towards the outer edge, it is known as ?
.
a.
current stress breakdown
b.
sharp bending damage
c.
static discharge damage
d.
water treeing of the insulation
Rubber gloves shall be worn continuously while working b.
on any structure carrying live conductors. This is known ground to ground
as the ? rule.
a.
assured safety
b.
ground to ground
c.
safety assurance
d.
zero potential
