Transformers A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is 0 V 1 V 0.85 V 1.7 V 0 V 1 V 0.85 V 1.7 V ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following transformer should never have the secondary open circuited while the primary is energised? Current transformer Potential transformer Power transformer Auto transformer Current transformer Potential transformer Power transformer Auto transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following 3 phase connections of transformer create disturbances in communication systems Delta/Star Star/Star Delta/Delta Star/Delta Delta/Star Star/Star Delta/Delta Star/Delta ANSWER DOWNLOAD EXAMIANS APP
Transformers The approximate efficiency of a large transformer is 65% 50% 80% 95% 65% 50% 80% 95% ANSWER DOWNLOAD EXAMIANS APP
Transformers Natural air cooling is generally restricted for transformers up to 15 MVA 50 MVA 5 MVA 1.5 MVA 15 MVA 50 MVA 5 MVA 1.5 MVA ANSWER DOWNLOAD EXAMIANS APP
Transformers The voltage transformation ratio of a transformer is equal to the ratio of secondary terminal voltage to primary applied voltage secondary current to primary current secondary induced e.m.f. to primary induced e.m.f. primary turns to secondary turns secondary terminal voltage to primary applied voltage secondary current to primary current secondary induced e.m.f. to primary induced e.m.f. primary turns to secondary turns ANSWER DOWNLOAD EXAMIANS APP
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