Transformers The efficiency of a transformer will be maximum when ______ None of the listed here Copper loss is equal to constant loss Resistance of the two winding are equal Leakage reactance of the two winding None of the listed here Copper loss is equal to constant loss Resistance of the two winding are equal Leakage reactance of the two winding ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following is not a fitting on a transformer? Commutator Conservator Buchholz's relay Breather Commutator Conservator Buchholz's relay Breather ANSWER DOWNLOAD EXAMIANS APP
Transformers A transformer operates poorly at very low frequencies because _____ 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 Magnetising current is abnormally high Primary reactance is too much increased ANSWER DOWNLOAD EXAMIANS APP
Transformers The hum in a transformer is mainly attributed to mechanical vibrations magnetostriction load changes oil in the transformer mechanical vibrations magnetostriction load changes oil in the transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers The maximum flux produced in the core of a transformer is ______ Inversely proportional to primary voltage Directly proportional to supply frequency Inversely proportional to supply frequency None of the listed here Inversely proportional to primary voltage Directly proportional to supply frequency Inversely proportional to supply frequency None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Transformers A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is 1.3 Ω 78 Ω 7.8 Ω 13 Ω 1.3 Ω 78 Ω 7.8 Ω 13 Ω ANSWER DOWNLOAD EXAMIANS APP
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