Single Phase Half Wave Uncontrolled Rectifier for R and L load

Pre Test

1) When we increase the capacitor value, then what will be the effect on ripples?
Reduced
Increased
Remains same
None of these
Hint : Half wave rectifier converting AC voltage to pulsating DC pulsating DC by diode as switch.


2) What is the relation between input frequency and reactance of capacitor?
Directly Proportional
Inversely Proportional
Constant
None of these
Hint : Half wave rectifier converting AC voltage to pulsating DC pulsating DC by diode as switch. To get pure dc need to use filter as capacitor to get constant dc voltage.

3) What is the relation between input frequency and reactance of capacitor?
Directly Proportional
Inversely Proportional
Constant
None of these
Hint : Due to the high resistance voltage drop will be more. so current will be decrease. but, as per ohm's law if voltage increase, current also will increase. but, here due to the resistance value is increasing, voltage drop is increasing but current is decreasing.

4) What will happen, if we connect capacitor to DC Supply.
It allows DC
It blocks DC
It rectifies
None of these
Hint : Diode is unidirectional and uncontrolled device. In rectifier circuit, diode use as a switch to convert ac to dc for rectification purpose.

5) If peak voltage on a half wave rectifier circuit is 5V and diode cut-in voltage is 0.7, then peak inverse voltage on diode will be
5.7V
3.6V
4.3V
5V
Hint: VPIV = VP- VD
VPIV =5-0.7
VPIV=4.3V