If a power cable and a communication cable are to run parallel the minimum distance between the two to avoid interference should be
50 cm
10 cm
2 cm
400 cm
50 cm
In cables the charging current
leads the voltage by 180°
leads the voltage by 90°
lags the voltage by 90°
lags the voltage by 180°
leads the voltage by 90°
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
one half
The intersheaths in the cables are used to
none of the above
avoid the requirement of good insulation
minimize the stress
provide proper stress distribution
provide proper stress distribution
The electrostatic stress in underground cables is
same at the conductor and the sheath
minimum at the conductor and maximum at the sheath
maximum at the conductor and minimum at the sheath
zero at the conductor as well as on the sheath
maximum at the conductor and minimum at the sheath
The breakdown of insulation of the cable can be avoided economically by the use of
both and
none of the above
insulating materials with different dielectric constants
inter-sheaths
both and
The insulation of the cable decreases with
the increase in length of the insulation
either or
the decrease in the length of the insulation
none of the above
the increase in length of the insulation
Cables for 220 kV lines are invariably
rubber insulated
compressed oil or compressed gas insulated
mica insulated
paper insulated
compressed oil or compressed gas insulated
Is a cable is to be designed for use on 1000 kV which insulation would you prefer ?
Compressed SF6 gas
Polyvinyle chloride
Vulcanised rubber
Impregnated paper
Compressed SF6 gas
The insulating material should have
high dielectric strength
high resistivity
low permittivity
all of the above
all of the above
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