State whether given statement is True or False:
An autotransformer is one in which the primary and secondary are automatically coupled.
A. True
B. False

Hint:We are given a statement about autotransformer. To answer the given question, first understand what a transformer is and what its primary and secondary windings are. Then understand what an autotransformer is and how its primary and secondary windings are connected.

Complete answer:
Given a statement, an autotransformer is one in which the primary and secondary are automatically coupled.First let us know what an autotransformer is. An autotransformer is a type of transformer which has a single winding. Normally, a transformer has two windings, one the primary winding and the other secondary winding. The primary winding takes power from the source and the secondary winding delivers the power to the load.
But in case of autotransformer portions of a single coil acts as both primary and secondary windings of the transformer, that is the primary and secondary windings are linked together. Therefore, we can say an autotransformer is one in which the primary and secondary windings are automatically coupled.Hence, the given statement is true.

Hence, option A is the correct answer.

Note:Transformer is an electrical device which is used to convert alternating current from one voltage to another. It can be either a step up or step down transformer. Step up transformer is used to increase the output voltage and step down is used to reduce the output voltage. The working principle of transformers is mutual induction between the primary and secondary coil.