Question

A full wave rectifier circuit is shown in figure.

1. Draw the output wave form of the rectifier.

2. If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

• 50 Hz
• 70.7 Hz
• 100 Hz
• 25 Hz

3. In a zener regulated power supply, a Zener diode with V_z = 6.0 V is used for regulation. The load current is to be 4.0 mA and the unregulated input 10.0 V. What is the value of series resistor R?

Answer 1

2. 100 Hz

3. Input Voltage = 10V, Zener voltage V_z = 6V The voltage drop on the resistor should be 4V

∴ R = \(\frac{V}{I}=\frac{4}{4\times10^{-3}}\) = 1 kΩ