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 7.8 Ω 13 Ω 78 Ω 1.3 Ω 7.8 Ω 13 Ω 78 Ω ANSWER DOWNLOAD EXAMIANS APP
Transformers An open-circuit test on a transformer is conducted primarily to measure copper loss insulation resistance total loss core loss copper loss insulation resistance total loss core loss ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following parts of a transformer is visible from outside? Primary winding Bushings Secondary winding Core Primary winding Bushings Secondary winding Core ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following transformer should never have the secondary open circuited while the primary is energised? Power transformer Auto transformer Potential transformer Current transformer Power transformer Auto transformer Potential transformer Current transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following is the main advantage of an auto-transformer over a two winding transformer? Hysteresis losses are reduced Copper losses are negligible Saving in winding material Eddy losses are totally eliminated Hysteresis losses are reduced Copper losses are negligible Saving in winding material Eddy losses are totally eliminated ANSWER DOWNLOAD EXAMIANS APP
Transformers The power efficiency of a lightning transformer is always ______its all day efficiency. Less than Higher than Equal to None of the listed here Less than Higher than Equal to None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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