Question

Useful flux of transformer is 1.2 weber.When transformer is loaded with 0.8 pf lagging then mutual flux will be

Answer 1

Mutual flux will be same as 1.2 weber as it is independent of change of load

Explanation:

We have given useful flux $\Phi =1.2weber$

Flux is said to be useful flux when it links to the both the winding of the transformer

And when the flux is linked with both the winding then it is also called mutual flux

And we know that mutual flux is constant even when we change the load

So when the transformer is loaded with 0.8 pf lagging mutual flux will be 1.2 weber.

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