Academics – Electro-Technology : 2020/AUG/06
Question
Q6. A 440 V/ 110 V, single-phase transformer has a primary resistance of and a secondary resistance of . The transformer core loss is 250 W at rated voltage.
Calculate EACH of the following at maximum efficiency:
(a) the primary and secondary currents; (10)
(b) the power output when the load power factor is 0.8 lagging; (2)
(c) the value of efficiency when the load power factor is 0.8 lagging. (4)
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