the idea is to let the battery gather some charge before you attempt the draw (starter amps). If you try this on a largish car which sucks about 600 cranking amps (like a european diesel) - you will fry your chooha alternator and also may cook your jump cables.
The jump cable clamp design is vital to ensure a good start, the teeth in the regular ones are undersized to pass any respectable amps - what is required is something like a pipe tongs but with flat section faces that can clamp onto the terminals with the most spread. I had such clamps on heavy gauge cables but they got borrowed (and never returned).. :mad:
I do this practice on every car - no matter if its a mehran. Wait for 10 mins with the "boost car engine at fast idle" - then start the dead one.
for a big one - I wait 15 or 20 mins - then shutdown the boost car and start the dead car - the risk of frying the alternator regulator is very high. In other countries where you call a tow truck - they either come with a booster pack or have the commercial grade alternator and battery in their truck to provide jump start. - then you part with about USD 100/- to get towed.