41.
Empire tape is
A
varnished cambric
B
vulcanised rubber
C
impregnated paper
D
none of the above
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Empire tape is
varnished cambric
vulcanised rubber
impregnated paper
none of the above
Dielectric strength of rubber is around
5 kV/mm
15 kV/mm
30 kV/mm
200 kV/mm
Copper as conductor for cables is used as
annealed
hardened and tempered
hard drawn
alloy with chromium
Conduit pipes are normally used to protect..............cables.
unsheathed cables
armoured
PVC sheathed cables
all of the above
Capacitance grading of cable implies
use of dielectrics of different permeabilities
grading according to capacitance of cables per km length
cables using single dielectric in different concentrations
capacitance required to be introduced at different lengths to counter the effect of inductance
Cables, generally used beyond 66 kV are
oil filled
S.L. type
belted
armoured
Cables for 220 kV lines are invariably
mica insulated
paper insulated
compressed oil or compressed gas insulated
rubber insulated
Cables are used for 132 kV lines.
High tension
Super tension
Extra high tension
Extra super voltage
A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
one half
double
four times
none of the above
A cable carrying alternating current has
hysteresis losses only
hysteresis and leakage losses only
hysteresis, leakage and copper losses only
hysteresis, leakage, copper and friction losses