2-5 MO VALLEY – Questions With Clear Solutions
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Terms in this set (83)
The NEC's definition of medium a.
voltage ranges from ? to ? . 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 True
conditions that 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 c.
shielding between the conductor and voltage stress
the insulation of the cable is to
eliminate ? 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 a.
to ozone and weathering and has EP
good low temperature properties,
good heat resistant properties, and
excellent electrical properties.
a.
EP
b.
PILC
c.
Thermoplastic
d.
XLP
, On cable circuits where the clearing b.
time requirements of the 100% level 133%
category cannot be met and there is
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 b.
cable helps to prevent high stress and possible corona
? by distributing the stress evenly
throughout the entire insulation
structure.
a.
EMF pulses
b.
possible corona
c.
radio noise
d.
treeing
Save
Terms in this set (83)
The NEC's definition of medium a.
voltage ranges from ? to ? . 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 True
conditions that 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 c.
shielding between the conductor and voltage stress
the insulation of the cable is to
eliminate ? 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 a.
to ozone and weathering and has EP
good low temperature properties,
good heat resistant properties, and
excellent electrical properties.
a.
EP
b.
PILC
c.
Thermoplastic
d.
XLP
, On cable circuits where the clearing b.
time requirements of the 100% level 133%
category cannot be met and there is
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 b.
cable helps to prevent high stress and possible corona
? by distributing the stress evenly
throughout the entire insulation
structure.
a.
EMF pulses
b.
possible corona
c.
radio noise
d.
treeing
