Transformers A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____. 100 W 200 W 400 W None of the listed here 100 W 200 W 400 W None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Transformers If a power transformer is operated at very high frequencies, then ______ None of the listed here Primary reactance is too much increased Core losses will be excessive Primary will draw large power None of the listed here Primary reactance is too much increased Core losses will be excessive Primary will draw large power ANSWER DOWNLOAD EXAMIANS APP
Transformers A transformer will have zero efficiency at No load Full load Half full load None of the listed here No load Full load Half full load None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Transformers The no load primary current is about ______of full load primary current. 30-40% 15-30% 3-5% Above 40% 30-40% 15-30% 3-5% Above 40% ANSWER DOWNLOAD EXAMIANS APP
Transformers The maximum flux produced in the core of a transformer is ______ Directly proportional to supply frequency Inversely proportional to supply frequency Inversely proportional to primary voltage None of the listed here Directly proportional to supply frequency Inversely proportional to supply frequency Inversely proportional to primary voltage None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Transformers A transformer operates poorly at very low frequencies because _____ Magnetising current is abnormally high Primary reactance is too much increased None of the listed here Permeability of core is increased Magnetising current is abnormally high Primary reactance is too much increased None of the listed here Permeability of core is increased ANSWER DOWNLOAD EXAMIANS APP
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