Tapping is provided in high voltage side because 1) Fine voltage regulation is possible with high voltage winding as it carries a large number of turns. 2) The low voltage winding of the transformer carries a large current.
Tappings are generally provided in high v/g side because high v/g side is low current then result is low sparking and high v/g side is more number of turns then result is easy to tapping.
There is practical problem also to apply tapping on LV side because of LV winding is inner layer of wind and HV is outer layer of winding. How tapping could be possible on inner winding near to core? right and practical answer is tapping is always provided on HV winding.
Tapping are generally used on high voltage side High voltage side has low current When we use tappings due to the low current on the high voltage side, there will be less sparks and the turns are higher when compared to LV side 
Bro whether transformer is step up or step down or power,distribution transformer always it will connect with high voltage side.can you conform me please.
But transformer ka main kaam valtage ko step up or step down karne ka hota h......na ki current kaaaaaa. Vo baat alag h ki voltage up hogi to current down or or voltage down hogi to to current up
Q. No-1 sahi ans hai power. Transformer voltage, current and frequency sabhi transfer korte hai primary to secondary side. Voltage and current up or down hota hai but frequency remain same both side. If there is no frequency in supply line, then the supply line is pure DC line, but transformer can't transmer DC line primary to the secondary side. Transformer can't passes only voltage or only current. Transformer means transfer of power, primary to the secondary side. Secondary side power is always less than primary side, because there are many losses.
Normally the tappings are provided on high voltage (h.v.) winding due to following reasons, 1) A fine voltage regulation is possible with high voltage winding as it carries large number of turns. 2) The low voltage winding of the transformer carries large current.
Taps are provided at the HV windings of the transformer because of the following reasons: The number of turns on high voltage winding is large and hence a fine voltage variation can be obtained. The current on low voltage winding of large transformer is high, therefore interruption of high current is a difficult taste.
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Tranformer transforms voltage. Frequency is not change in a transformer. A common method of cooling a power transformer is Oil Cooling. In a transformer the tapping are generally provided on low voltage side. Material used for lamination of transformet is silicon steel. Thickness of lamination is generally from 0.4 mm to 0.5 mm. Maximum efficiency of a distribution transformer is at 50% full load. Open circuit test on transformer is to determine - Core loss Short circuit test is to determine - Copper loss Friction Loss is zero even at full load becuse it is a static device. Transformer are rated in KVA because total transformer loss depends on volt-ampere. An ideal transformer will have max efficiency when copper loss =
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