Why flux in primary and secondary winding is always equal?

flux produced in primary winding will pass through the secondary winding, so generated flux in primary winding will be same as in secondary winding. Flux is directly proportional to the Ampere-Turns not proportional to the turns ratio (N).

Why the primary and secondary coils of a transformer are preferably found on the same code?

The primary and secondary coils of a transformer are preferably wound on the same core so as to obtain tight coupling between the primary and secondary on each winding.

What is MMF balance in transformer?

Similarly, in magnetic circuit, MMF (Magneto Motive Force) is the force responsible for generation & motion of magnetic flux. So, on primary side of transformer, a winding is placed & on secondary side also one winding is placed.

Which of the following is the main advantage of an autotransformer over two winding transformer?

An autotransformer compared to its two-winding counterpart has a higher operating efficiency. Explanation: The losses are less in autotransformer compare to two-winding transformer. Thus, for the given same input to autotransformer as that of two-winding transformer more output will be available to secondary side.

Why is the primary coil of a transformer wound on the secondary coil?

Generally, the primary winding of a transformer is connected to the input voltage supply and converts or transforms the electrical power into a magnetic field. While the job of the secondary winding is to convert this alternating magnetic field into electrical power producing the required output voltage as shown.

Why does the primary current in a transformer increase when a load is connected across the secondary?

This is called the exciting, or magnetizing, current. The magnetic field caused by this exciting current cuts across the secondary coil and induces a voltage by mutual induction. The primary current increases as the secondary load current increases, and decreases as the secondary load current decreases.

Why frequency of primary and secondary of a transformer are same?

As the transformer is a Static device or both windings are at standstill, Frequency does not change in Transformer. Input frequency creates a pattern in the Flux produced by the primary winding. That is why the frequency of secondary winding the same as the input frequency.

Why is the secondary power of a transformer less than its primary power?

The MAIN reason for this difference is that a transformer draws a No-Load current to establish magnetic flux inside the core, that is primarily reactive in nature. Even if it’s secondary side is not loaded, a transformer will draw this no-load current resulting in very poor input side P.F.