Answer / vigneshsriteee

Its neither dc nor ac.. its just a pulse... more powerful pulse..

Answer / srinivasa rao talasila

It is a high magnitude pulse in micro seconds discharge.

so many mega volts of supply will discharge in 10 power -6
seconds.

Answer / sarfaraj shaikh

Its just a pulse.......its not D.C. or A.c.

Answer / tarun aggarwal ymca(tarun.agga

Lightning is an atmospheric electrostatic discharge (spark),SO Initially It is DC with an extremely fast rise time which gives it a high frequency AC component at the initial strike. Once the arc is established it contains all frequencies in the RF spectrum which makes it AC.

Answer / k.prakashchandra

It is a discharge between the oppositely charged and hence
can be considered as DC pulse as the 'only AC' appliances
burn out due to even small voltages caused by lightning
strokes and incandescent lamp remains unaffected.

Answer / koti

it is purely pulse with a time period in seconds
by using high voltage engineering methods we can use this
power

Answer / sanjay rawat

all of u says that it is a pulse of high magnitude for micro sec
so this pulse is a spike
so we can concidered as ac

Answer / prakash

the lightning loda is ac

Answer / guest

it is pure dc only

For which purpose the temp. rise test of transformer is conducted?

2 Answers  

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Can earth resistance be measured without connecting the earth electrode? and should earthing connections be disconnected What is the effect of connecting two cables of different sizes in parallel with supply? Thanks in Advance. I am intrested to get in touch with some tecnocrats/engineers,my mail i.d is : hiremathvijay@rediffmail.com

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