In a cable immediately above metallic sheath _____ is provided.
earthing connection
armouring
bedding
none of the above
bedding
Conduit pipes are normally used to protect _____ cables.
unsheathed cables
all of the above
PVC sheathed cables
armoured
unsheathed cables
The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
smaller dielectric loss
non-existence of any stability limit
absence of harmonics
absence of ripples
smaller dielectric loss
Dielectric strength of rubber is around
200 kV/mm
30 kV/mm
5 kV/mm
15 kV/mm
30 kV/mm
In case of three core flexible cable the colour of the neutral is
blue
black
brown
none of the above
blue
In single core cables armouring is not done to
none of the above
either of the above
make it flexible
avoid excessive sheath losses
avoid excessive sheath losses
The minimum dielectric stress in a cable is at
armour
bedding
lead sheath
conductor surface
lead sheath
In capacitance grading of cables we use a ______ dielectric.
composite
hygroscopic
homogeneous
porous
composite
The relative permittivity of rubber is
between 2 and 3
between 8 and 10
between 5 and 6
between 12 and 14
between 2 and 3
Pressure cables are generally not used beyond
132 kV
66 kV
11 kV
33 kV
66 kV
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