Transformers In a transformer, leakage flux Produces mutually induced emf Is minimised by interleaving the primary and secondary windings Is negligible at full load Helps in transfer of energy Produces mutually induced emf Is minimised by interleaving the primary and secondary windings Is negligible at full load Helps in transfer of energy ANSWER DOWNLOAD EXAMIANS APP
Transformers The approximate efficiency of a large transformer is 95% 80% 65% 50% 95% 80% 65% 50% ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following acts as a protection against high voltage surges due to lightning and switching? Breather Horn gaps Thermal overload relays Conservator Breather Horn gaps Thermal overload relays Conservator 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 12 V 240 V 2,400 V 120 V 12 V 240 V 2,400 V 120 V ANSWER DOWNLOAD EXAMIANS APP
Transformers The no load ratio of a 50 Hz single phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns? 210 450 350 900 210 450 350 900 ANSWER DOWNLOAD EXAMIANS APP
Transformers Distribution transformers are generally designed for maximum efficiency around 25% load Zero load 50% load 90% load 25% load Zero load 50% load 90% load ANSWER DOWNLOAD EXAMIANS APP
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