A transformer core is laminated to? Mark as favorite Copy Link reduce hysteresis loss reduce eddy current losses reduce copper losses reduce all above losses Check Answer
The dielectric strength of transformer oil is expected to be? Mark as favorite Copy Link 1 kV 33 kV 100 kV 330 KV Check Answer
Noise level test in a transformer is a? Mark as favorite Copy Link special test routine test type test none of the above Check Answer
A good voltage regulation of a transformer means? Mark as favorite Copy Link output voltage fluctuation from no load to full load is least output voltage fluctuation with power factor is least difference between primary and secondary voltage is least difference between primary and secondary voltage is maximum Check Answer
The purpose of providing iron core in a step-up transformer is? Mark as favorite Copy Link to provide coupling between primary and secondary to increase the magnitude of mutual flux to decrease the magnitude of magnetizing current to provide all above features Check Answer
The efficiency of two identical transformers under load conditions can be determined by? Mark as favorite Copy Link short-circuit test back-to-back test open circuit test any of the above Check Answer
A transformer oil must be free from? Mark as favorite Copy Link sludge odour gases moisture Check Answer
Scott connections are used to convert? Mark as favorite Copy Link three-phase supply to D.C. supply three-phase supply to three-phase supply three-phase supply to two-phase supply three-phase supply to single-phase supply Check Answer
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in? Mark as favorite Copy Link short-circuiting of the secondary power factor of one of the transformers is leading while that of the other lagging transformers having higher copper losses will have negligible core losses loading of the transformer not in proportion to their kVA ratings Check Answer
In a transformer maximum voltage regulation occurs when the power factor of the load is? Mark as favorite Copy Link 0.4 leading lagging unify Check Answer