As a result transformer primary will behave as a short circuit and heavy current will flow through the primary which will, in turn, burn the windings. More Transformer MCQ :. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.
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Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. This series resistance limits the primary current to a safe DC value and thus prevent the primary from burning out. Because there is no frequency in DC and the impedance Z of inductor is zero.
Related Posts:. If we give dc supply to transformer with high series resistance. Then the transformer output will be ac or dc?
Another case is also possible if we supply very low DC voltage I. And as per the answer of question what is the output if we supply DC since due to DC inductor act as short circuit there is no magnetization of primary and therefore no flux will going to produce by primary so there is linkage of flux with secondary winding so there is no output.
Yes because inductor coils works with change in flux linked with coil In DC there is a constant supply and thus no change in flux hence no induced emf or voltage. In ac as we know sinusodial wave is there due to which current and voltage changes continuously and which in turn is responsible for change in magnetic flux linked with coil ang thus induced emf.
Alternating field is required to produce voltage and flux linkage to windings on a common core. The transformer will not give any output. Transformer works on mutual induction.
Concept of connecting high resistance is totally wrong. Since the D. What about automotiv ignition coil? This is step up transformer which works on 12 volts DC supply. But if we apply dc voltage to see the reaction ,remember dc has zero frequence and given by its formular. SO it produces zero inductive reactance to the applied voltage or current. Your email address will not be published. Notify me of follow-up comments by email.
Notify me of new posts by email. Table of Contents. Last updated: 10th Nov ' What happens if D. What will happen if a DC voltage is given to the transformer primary?
This means that I rise to a dangerously high level and then stop changing. There is a strong short-circuit current that overheats the coils, resulting in quadratic R losses.
The temperature rise exceeds safe levels and the device eventually catches fire. Short-circuit currents lead to radial magnetic forces, which tear the winding and expose the windings to the atmosphere. Transformer oil can ignite under short circuit conditions.
Therefore, under operating conditions, we must never apply a DC voltage to a transformer.
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