GATE 2022 : Power System Quiz 2

Which one of the following statements is not correct regarding bundle conductors?

Choose the correct option related to maximum power transfer capability of transmission line:

1. If line inductance reduces, P_max increases.

2. If GMD increases, P_max increases.

The voltage across bottom unit of 4 units is one third of total voltage, then the string efficiency is __________%.

A 250 km, 3-phase, 50 Hz transmission line has the following ABCD parameters:

The sending end voltage is 230 kV. Find the maximum power (in MW) that can be transmitted to the receiving end at a voltage of 220 kV.

A 3- T.L. having conductors each of resistance 1 Ω /km is supplying a load of 10 MW at 0.8 p.f. (lagging). The receiving end voltage is 132 kv. The losses in the T.L. is found to be 10% of load. Calculate the distance over which the load is supplied.

Two single-core power cables have total conductor resistances of 0.7 Ω and 0.5 Ω, respectively. and their insulation resistances (between core and sheath) are 600 MΩ and 900 MΩ, respectively. When the two cables are joined in series, the ratio of insulation resistance to conductor resistance is ________× 10⁶.