The correct answer is D : It is not a transformer
Transformer are of two types ,Step up and step down. They are used in alternating current to step up and step down the current. That is why they are called step up transformer and step down transformer because of the nature of their work. Both types of transformer have two coils each , primary and secondary.
A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.This increase in voltage for transmission and decrease in voltage for utilization can only be achieved by using a step-up and step-down transformer. The major difference between step-up and step-down transformer is, step-up transformer raises the output voltage, whereas step-down transformer reduces the output voltage.
Step-up and step-down transformers use electromagnetic induction to convert voltage between two circuits. We use both types in the distribution of power from supply stations to the end user, as well as to ensure that the appropriate voltage goes into a circuit on many personal devices.Yes you can use a transformer in reverse. The no part has to do with the transformer's design. Secondary or output windings are low impedance to reduce losses and increase efficiency. ... You would need a transformer designed to step up 415V to 11kV.