GATE 2023 Power Systems Quiz 44

Which of the following statement is NOT correct about insulator?

The insulation resistance to a cable of length 20 km is 500kΩ. For a length of 100 km of the same cable the insulation resistance will be________?

A string is made from two insulator discs of identical capacitance value C for a 22 kV, 50 Hz single phase overhead line insulation system. If the pin to earth capacitance is also C, then calculate the % string efficiency?

Pin type insulators are not suitable for voltage level of _____?

In a 3-Φ power system the ratio of shunt capacitance to mutual capacitance is 0.2. The string consists of 3 similar disc of insulators. The conductor having 11 KV voltage. Find the % string efficiency?

In a three unit insulator sting, voltage across the lowest unit is 16.5kV and string efficiency is 85%. The total voltage across the string will be equal to ______ in V