Transformers How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V? 900 V 9 V 0.9 V 90 V 900 V 9 V 0.9 V 90 V ANSWER DOWNLOAD EXAMIANS APP
Transformers For the parallel operation of single phase transformers it is necessary that they should have same number of turns on the secondary side. same efficiency same polarity same kVA rating same number of turns on the secondary side. same efficiency same polarity same kVA rating ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following property is not necessarily desirable in the material for transformer core? High thermal conductivity Mechanical strength Low hysteresis loss High permeability High thermal conductivity Mechanical strength Low hysteresis loss High permeability ANSWER DOWNLOAD EXAMIANS APP
Transformers The hum in a transformer is mainly attributed to magnetostriction mechanical vibrations oil in the transformer load changes magnetostriction mechanical vibrations oil in the transformer load changes 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 240 V 12 V 120 V 2,400 V 240 V 12 V 120 V 2,400 V ANSWER DOWNLOAD EXAMIANS APP
Transformers The efficiency of a transformer will be maximum when ______ Leakage reactance of the two winding Resistance of the two winding are equal Copper loss is equal to constant loss None of the listed here Leakage reactance of the two winding Resistance of the two winding are equal Copper loss is equal to constant loss None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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