Electrical engineering MCQ

 

1.     1  .   Ripple frequency of the output waveform of full wave rectifier ,when fed with a 50Hz sine wave is      A) 25 Hz     B ) 50 Hz     C)   100 Hz       D ) 200 Hz 

           Answer =   In full wave rectifier , Ripple  frequency = 2 x supply frequency

                                Fr = 2 x f

                                     = 2 x 50 Hz 

                                     =  100 Hz   ( D )

         Note : In half wave rectifier , we get output only in on half cycle of input AC therefore the frequency of the ripple of the output is same as that of input AC.

                                Fr = f