1. Check the Reciprocity theorem for the network, with source and output response positions being at input and output terminals

In single phase transformer, if the primary turns N1 is greater than the secondary turns N2, then what is the relation between V1 and V2? a.V1 < V2 b.V2 > V1 c.V1 > V2 d.V1 = V2

What do the connection angles and groups show in transformers? For example, where are the Yy0 , Dy5 ,Yd5, Yz5 group transformers used?

When the transformer is loaded in a balanced fashion up to its nominal rating (10 MVA), calculate the high side line-to-line phasor voltages (ab, bc, ca). and low side phasor voltages both line-to-line and line-to-neutral (ab, bc, ca, a, b,c). as a reference for calculations the low side A line to neutral voltage is 7620V at an angle of 0 degrees when the transformer is at rated power.  The transformer has the following characteristics: V: 138kV delta high side/ 13.2 kV wye low side 9% impedance X/R ratio of 20

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