Transformers An open-circuit test on a transformer is conducted primarily to measure core loss insulation resistance copper loss total loss core loss insulation resistance copper loss total loss ANSWER DOWNLOAD EXAMIANS APP
Transformers The efficiencies of transformers compared with that of electric motors of the same power are about the same much smaller much higher somewhat smaller about the same much smaller much higher somewhat smaller ANSWER DOWNLOAD EXAMIANS APP
Transformers The no load primary current is about ______of full load primary current. Above 40% 15-30% 3-5% 30-40% Above 40% 15-30% 3-5% 30-40% ANSWER DOWNLOAD EXAMIANS APP
Transformers What is the approximate efficiency of large transformers? 95 % 65% 85% 75% 95 % 65% 85% 75% ANSWER DOWNLOAD EXAMIANS APP
Transformers If a power transformer is operated at very high frequencies, then ______ Primary will draw large power None of the listed here Core losses will be excessive Primary reactance is too much increased Primary will draw large power None of the listed here Core losses will be excessive Primary reactance is too much increased ANSWER DOWNLOAD EXAMIANS APP
Transformers No-load current of a transformer has has high magnitude and low power factor has small magnitude and low power factor has small magnitude and high power factor has high magnitude and high power factor has high magnitude and low power factor has small magnitude and low power factor has small magnitude and high power factor has high magnitude and high power factor ANSWER DOWNLOAD EXAMIANS APP
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