Correct option is A
Primary winding will burn out when the rated DC supply is given to the primary of the transformer.
The transformer works on the principle of mutual induction. so it only operates on alternating current.
This is because a transformer works on the principle of electromagnetic induction.
Which requires a voltage source that changes with time (alternating source).
Thus, since a dc supply is unidirectional, the transformer cannot work. Simple, no voltage or output.
Applying a DC supply to a transformer is generally not advised because it can lead to several issues:
No Alternating Magnetic Field:
A transformer operates on the principle of electromagnetic induction, which requires an alternating magnetic field.
DC supply does not create an alternating magnetic field, which means the transformer will not function as intended.
Saturation of the Core:
DC supply can cause the transformer's core to become magnetically saturated.
This saturation occurs because the constant DC creates a steady magnetic field, rather than an alternating one.
Once the core is saturated, it cannot magnetize any further, effectively stopping the transformer from working.
Overheating: Since there is no inductive reactance in DC to limit the current.
Large amount of current can flow through the winding when a DC supply is applied.
This can lead to excessive heating of the windings, potentially damaging the insulation and other components of the transformer.
No Voltage Transformation: Since the operation of a transformer relies on the changing magnetic field produced by AC.
To induce voltage in the secondary coil, applying DC would not result in any voltage transformation.
