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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
To reduce the ripples in a rectifier circuit with capacitor filter:
  • A
    RL should be increased.
  • B
    Input frequency should be decreased.
  • C
    Input frequency should be increased.
  • D
    Capacitors with high capacitance should be used.
✓

Answer

  1. RL should be increased.
  1. Input frequency should be increased.
  2. ​​​​​Capacitors with high capacitance should be used.

Solution:

Ripple factor may be defined as the ratio of r.m.s. value of the ripple voltage to the absolute value of the DC component of the output voltage, usually expressed as a percentage. However ripple voltage is also commonly expressed as the peak-to-peak value. Ripple factor (r) of a full wave rectifier using capacitor filter is given by

$\text{r}=\frac{0.236\text{R}}{\omega\text{L}}$

where, L is inductance of the coil and $\omega$ is the angular frequency.

or Ripple factor can also be given by

$\text{r}=\frac{1}{4\sqrt{3}\text{v}\text{R}_\text{L}\text{C}_\text{V}}$

i.e., $\text{r}\propto\frac{1}{\text{R}_\text{L}}\Rightarrow\ \text{r}\propto\frac{1}{\text{C}},\text{r}\propto\frac{1}{\text{V}}$

Ripple factor is inversely proportional to RL, C and v.

Thus to reduce r, RL should be increased, input frequency v should be increased and capacitance C should be increased.

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