The geometric mean radius of a conductor, having four equal strands with each strand of radius ‘𝑟’, as shown in the figure below, is

Consider an overhead transmission line with 3-phase, 50 Hz balanced system with conductors located at the vertices of an equilateral triangle of length  as shown in figure below. The resistances of the conductors are neglected. The geometric mean radius (GMR) of each conductor is 0.01 m. Neglecting the effect of ground, the magnitude of positive sequence reactance in  (rounded off to three decimal places ) is ___________

A single-phase transmission line has two conductors each of 10 mm radius. These are fixed at a center-to-center distance of 1m in a horizontal plane. This is now converted to a three-phase transmission line by introducing a third conductor of the same radius. This conductor is fixed at an equal distance D from the two single-phase conductors. The three phase line is fully transposed. This positive sequence inductance per phase of the three-phase system is to be 5% more than that of the inductance per conductor of the single-phase system. The distance D, in meters, is_________________.

A composite conductor consists of three conductors of radius R each. The conductors are arranged as shown below. The geometric mean radius (GMR) (in cm) of the composite conductor is kR.  The value of k is ____________.

The horizontally placed conductors of a single phase line operating at 50Hz are having outside diameter of 1.6cm, the spacing between centers of the conductors is 6m. The permittivity of free space is F/m. The capacitance to ground per kilometer of each line is

In a long transmission line with r, l, g and c are the resistance, inductance, shunt conductance and capacitance per unit length, respectively, the condition for distortion less transmission is

A nuclear power station of 500MW capacity is located at 300km away from a load center. Select the most suitable power evacuation transmission configuration among the following options

A lossless transmission line having Surge Impedance Loading (SIL) of 2280 MW is provided with a uniformly distributed series capacitive compensation of 30%. Then, SIL of the compensated transmission line will be

Consider a bundled conductor of an overhead line, consisting of three identical sub-conductors placed at the corners of an equilateral triangle as shown in the figure. If we neglect the charges on the other phase conductors and ground, and assume that spacing between sub-conductors is much larger than their radius, the maximum electric field intensity is experienced at        

Bundled conductors are mainly used in high voltage overhead transmission lines to

Consider a long, two-wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and the distance between their centers is 1m. If this distance is doubled, then the inductance per unit length

The conductors of a 10 km long, single phase, two wire line are separated by a distance of 1.5m.  The diameter of each conductor is 1 cm.  If the conductors are of copper, the inductance of the circuit is

For a single phase overhead line having solid copper conductors of diameter 1cm, spaced 60cm between centers, the inductance in mH/km is:

If the length of a wire of resistance R is uniformly stretched to n times its original value, its new resistance is

For equilateral spacing of conductors of an untransposed 3-phase line, we have

The charging current of a 400kV transmission line is more than that of a 220kV line of the same length. (True=1/False=0)

The increase in resistance due to non-uniform distribution of current in a conductor is known as skin effect. (True=1/False=0)

A three-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d’. If now the conductors of the line are rearranged to form an equilateral triangle of sides equal to ‘d’ then :

The inductance of a power transmission line increases with