Two three-phase transformers of equal voltage ratios are operating in parallel. The load draws a current of 200 A at a power factor of 0.9 lagging. The secondary impedances of each of the transformers are given below: Z1 = 0.1 + j0.3 ohm Z2 = 0.2 + j0.5 ohm, Calculate the current delivered by each transformer.

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

3. A non-ideal 1-phase transformer has turns ratio 5:1 with 120Vac primary.  The primary impedance is 1 + j1 Ohms, and the secondary impedance is 0.2 + j0.2 Ohms.  Assume the core impedance (R0 and X0) can be neglected.  A resistive load of 12 Ohms is connected to the secondary.   What is the primary current magnitude? What is the secondary voltage magnitude? What is the efficiency of this transformer with this load?

Ql-phase step down transformer 1250 KVA, 10002200 V, 50 Hz The resistance /phase and leakage reactanceiphase of the primary winding are 0.78 2 and 4.82 and the corresponding values for the secondary winding are 0.012 and 0.002 respectively if the primary winding is connected in delta and secondary in star calculate: )The voltage to be applied at normal frequency to the primary to circulate full-load through it when the secondary is short-circuited li) The full load copper loss