28) If the input AC voltage of half wave rectifier is 12 V, then the output DC voltage will be

29) If the DC output voltage of half wave rectifier is 13.5 volt, then the input AC voltage is

30) In a bridge rectifier, No. of diodes conduct at a time is

31) In Bridge rectifier, how many times of ripple frequency at the output is greater than the input AC frequency ?

32) If the input A.C. frequency is 50 Hz, then the output ripple frequency of the bridge rectifier is