Transformers When secondary of a current transformer is open-circuited its iron core will be cool as there is no secondary current none of above will happen hot because of heavy iron losses taking place in it due to high flux density hot because primary will carry heavy current cool as there is no secondary current none of above will happen hot because of heavy iron losses taking place in it due to high flux density hot because primary will carry heavy current ANSWER DOWNLOAD EXAMIANS APP
Transformers The secondary of a current transformer is always short-circuited under operating conditions because it protects the primary circuit None of these is safe to human beings avoids core saturation and high voltage induction protects the primary circuit None of these is safe to human beings avoids core saturation and high voltage induction ANSWER DOWNLOAD EXAMIANS APP
Transformers The power efficiency of a lightning transformer is always ______its all day efficiency. Less than Equal to None of the listed here Higher than Less than Equal to None of the listed here Higher than ANSWER DOWNLOAD EXAMIANS APP
Transformers What is the approximate efficiency of large transformers? 85% 95 % 65% 75% 85% 95 % 65% 75% ANSWER DOWNLOAD EXAMIANS APP
Transformers A common method of cooling a power transformer is natural air cooling air blast cooling Any of these oil cooling natural air cooling air blast cooling Any of these oil cooling ANSWER DOWNLOAD EXAMIANS APP
Transformers The approximate efficiency of a large transformer is 80% 50% 65% 95% 80% 50% 65% 95% ANSWER DOWNLOAD EXAMIANS APP
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