Question

If the load current of a single phase semi converter excited from a sinusoidal AC voltage source is $10A$ and firing angle is ${45}^o$, then the rms value of fundamental component of the current is _____ $A$.

• A. 8.31

Answer 1

The correct option is A 8.31
Rms value of fundamental component of the current is,
$I_{S1}=\frac{2\sqrt{2}{I}_0}{\pi }.cos\frac{\alpha }{2}$
$=\frac{2\sqrt{2}\times 10}{\pi }.cos\frac{{45}^o}{2}=8.317A$