For no load transformer, the measured primary current at rated voltage value is
ID: 2081505 • Letter: F
Question
For no load transformer, the measured primary current at rated voltage value is Exactly equal to excitation current of the transformer when fully loaded Exactly equal to the rated current of the transformer. Slightly greater than the rated current. Slightly less than the rated current. When a dc voltage source of 220 V is connected across a transformer of equal turns ratio then: The transformer secondary voltage will be 220 dc voltage The transformer input current will be extremely high The secondary winding voltage will be converted into of 220 V rms value None of the above For open load test of transformer, the measured primary current at rated voltage value is: almost equal to the excitation current of the transformer when fully loaded almost equal to the rated current of the transformer. slightly greater than the rated primary current. slightly less than the primary rated current. For a short circuit test of a transformer, the measured active power in the primary circuit is represent the power dissipated in: the primary winding resistances the secondary winding resistance both primary and secondary winding resistances none of the above is correct. Given that the measured power dissipated during open circuit and short circuit test of a single phase transformer are P_ = 180W and P_sc = 120W. If the transformer is fully loaded at rated values, the total power losses in the transformer at 0.8 power factor lagging is: 240 Watt 300 Watt 120 Watt 180 Watt All above are not correctExplanation / Answer
1)a.exactly equal to the excitation current of transformer when fully loaded
2)b.transformer input current will be extremely high as hter will be only winding resistance across supply.
3)a.almost equal to the excitation current of transformer when fully loaded
4)c. both primary and secondary winding resistances
1.total power losses =120+180=300 W
losses doesnt depend on power factor.
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