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Why humming sound occur in extra high tension transmission lines?

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The noise is better described as 'buzzing', rather than 'humming', and it is caused by the breakdown of the air's insulating properties, due to stress caused by electric fields set up in the vicinity of where the conductors are supported from insulators. The noise is accompanied by a pale blue discharge which becomes visible after dark.
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What is wrong if the transmission shifts jerky and makes a humming sound?

  There's an electronic control in the transmission, called a pressure control module, that could be out. Mine does the same thing every now and then, but corrects after a

Why the transmission line are at high voltage?

To reduce the power losses or conduction losses in transmission lines. - Yes its right. I will give a slightly improved answer. The size of coper conductor used for transm

When does a high pitch sound occur?

Whenever there's something vibrating, in the upper range of human hearing, there may be a high pitch sound.

What is load on high tension line if low tension line have a 20 ampere?

I think you're confusing "tension" with "voltages". Current flows in loops, so if there is no place for the current to "escape" between what you're referring to as the "high t

Why does sparking occurs in high tension conductors?

ya its very simple. Due to the high potential, there is a greater electric field developed around the conductors. This field ionizes the air present around the conductors. D