Discussion
The ripple frequency of the bridge rectifier is 120 Hz. What will be the frequency of the supply?
Answer: B
The frequency of the supply is 60 Hz. In a single phase bridge rectifier, the output ripple frequency is twice the supply frequency, because both half cycles are rectified.
\[ f_{ripple} = 2f \]
\[ f = \frac{120}{2} = 60\ \text{Hz} \]
A supply of 30 Hz would give a ripple of 60 Hz, 90 Hz would give 180 Hz and 120 Hz would give 240 Hz, none of which is 120 Hz. So the second option is correct.
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