Transformers A transformer operates poorly at very low frequencies because _____ 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 Magnetising current is abnormally high ANSWER DOWNLOAD EXAMIANS APP
Transformers When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is 120 V 12 V 2,400 V 240 V 120 V 12 V 2,400 V 240 V ANSWER DOWNLOAD EXAMIANS APP
Transformers Short circuit test of a transformer helps us to find its Iron loss Full load cu loss Cu loss at no load None of the listed here Iron loss Full load cu loss Cu loss at no load None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Transformers The efficiency of a transformer will be maximum when ______ Resistance of the two winding are equal None of the listed here Leakage reactance of the two winding Copper loss is equal to constant loss Resistance of the two winding are equal None of the listed here Leakage reactance of the two winding Copper loss is equal to constant loss ANSWER DOWNLOAD EXAMIANS APP
Transformers In which of the following transformer part of primary winding also serves as the secondary winding? Step-up transformer Current transformer Potential transformer Auto transformer Step-up transformer Current transformer Potential transformer Auto transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary? 4 0.96 0.4 9.6 4 0.96 0.4 9.6 ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS