# 36 Lecture

## Full wave rectifier

A full wave rectifier consists of four diodes arranged in a bridge configuration. The AC input is applied across two of the diodes and the DC output is taken across the other two diodes

## Important Mcq's Midterm & Finalterm Prepration Past papers included

Which of the following is the configuration of a full wave rectifier?

a) Center-tap

b) Bridge

c) Half-wave

d) None of the above

How many diodes are used in a full wave rectifier?

a) 1

b) 2

c) 3

d) 4

What is the purpose of the filter capacitor in a full wave rectifier circuit?

a) To increase the ripple in the output

b) To reduce the ripple in the output

c) To decrease the output voltage

d) None of the above

Answer: b) To reduce the ripple in the output

What is the ripple frequency in a full wave rectifier?

a) Half the frequency of the AC input

b) Equal to the frequency of the AC input

c) Double the frequency of the AC input

d) None of the above

Answer: c) Double the frequency of the AC input

What is the efficiency of a full wave rectifier compared to that of a half wave rectifier?

a) Higher

b) Lower

c) Same

d) Cannot be determined

What is the output voltage of a full wave rectifier compared to that of a half wave rectifier?

a) Higher

b) Lower

c) Same

d) Cannot be determined

What is the purpose of the center-tapped transformer in a full wave rectifier circuit?

a) To provide DC voltage

b) To reduce the ripple in the output

c) To double the output voltage

d) None of the above

Answer: d) None of the above

What is the peak inverse voltage rating required for the diodes in a full wave rectifier circuit?

a) Equal to the peak voltage of the AC input

b) Twice the peak voltage of the AC input

c) Half the peak voltage of the AC input

d) None of the above

Answer: b) Twice the peak voltage of the AC input

What is the type of output waveform produced by a full wave rectifier?

a) Sine wave

b) Square wave

c) Triangular wave

d) None of the above

Answer: d) None of the above (It is a pulsating DC waveform)

What is the range of the output voltage of a full wave rectifier circuit?

a) 0 to the peak voltage of the AC input

b) 0 to twice the peak voltage of the AC input

c) Equal to the RMS voltage of the AC input

d) None of the above

Answer: b) 0 to twice the peak voltage of the AC input

## Subjective Short Notes Midterm & Finalterm Prepration Past papers included

What is a full wave rectifier?

Answer: A full wave rectifier is a type of rectifier that converts the entire cycle of an AC signal into a positive DC signal.

What is the configuration of a full wave rectifier?

Answer: A full wave rectifier consists of four diodes arranged in a bridge configuration.

How do the diodes conduct in a full wave rectifier?

Answer: During the positive half-cycle of the AC input, diodes D1 and D2 conduct, while during the negative half-cycle, diodes D3 and D4 conduct.

What is the ripple frequency in a full wave rectifier?

Answer: The ripple frequency in a full wave rectifier is twice the frequency of the AC input.

What is the purpose of the filter capacitor in a full wave rectifier?

Answer: The filter capacitor is added across the load resistor RL to reduce the ripple component of the output.

How does the efficiency of a full wave rectifier compare to that of a half wave rectifier?

Answer: The efficiency of a full wave rectifier is higher than that of a half wave rectifier.

What is the output voltage of a full wave rectifier compared to that of a half wave rectifier?

Answer: The output voltage of a full wave rectifier is higher than that of a half wave rectifier.

What is the significance of the output waveform in a full wave rectifier?

Answer: The output waveform in a full wave rectifier is smoother than that of a half wave rectifier.

What is the input voltage required for a full wave rectifier?

Answer: A full wave rectifier requires an AC input voltage.

What is the load resistor in a full wave rectifier?

Answer: The load resistor in a full wave rectifier is the resistor connected to the output terminals.

### Full wave rectifier

In the field of electronics, a rectifier is a device that is used to convert alternating current (AC) to direct current (DC). The full wave rectifier is one of the most commonly used types of rectifiers. It is used to convert the entire cycle of the AC signal into a positive DC signal. A full wave rectifier consists of four diodes arranged in a bridge configuration. The AC input is applied across two of the diodes and the DC output is taken across the other two diodes. The diodes are arranged in such a way that they conduct during alternate half-cycles of the AC input. During the positive half-cycle of the AC input, diodes D1 and D2 conduct, while diodes D3 and D4 are reverse-biased and do not conduct. The current flows through the load resistor RL and produces a positive half-cycle output. During the negative half-cycle of the AC input, diodes D3 and D4 conduct, while diodes D1 and D2 are reverse-biased and do not conduct. The current flows through the load resistor RL and produces a negative half-cycle output. The output of a full wave rectifier is not pure DC because it contains a ripple component due to the fact that the diodes conduct only during alternate half-cycles of the AC input. The ripple frequency is twice the frequency of the AC input, which means that for a 60 Hz AC input, the ripple frequency is 120 Hz. To reduce the ripple component, a filter capacitor is added across the load resistor RL. The capacitor charges up during the positive half-cycle and discharges during the negative half-cycle, thereby reducing the ripple component of the output. The efficiency of a full wave rectifier is higher than that of a half wave rectifier because it uses both half-cycles of the AC input. The output voltage of a full wave rectifier is also higher than that of a half wave rectifier because it uses both the positive and negative half-cycles of the AC input. In summary, a full wave rectifier is a type of rectifier that converts the entire cycle of an AC signal into a positive DC signal. It consists of four diodes arranged in a bridge configuration. During the positive half-cycle of the AC input, diodes D1 and D2 conduct, while during the negative half-cycle, diodes D3 and D4 conduct. A filter capacitor is added across the load resistor RL to reduce the ripple component of the output. The efficiency and output voltage of a full wave rectifier are higher than those of a half wave rectifier.