# 45 Lecture

## Bridge rectifier

The full wave bridge rectifier circuit consists of four diodes connected in a bridge configuration. The AC input voltage is applied to the primary winding of a transformer.

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

What is the rectification factor for a full wave bridge rectifier?

a) 0.5

b) 0.637

c) 0.812

d) 1

How many diodes are used in a full wave bridge rectifier?

a) 1

b) 2

c) 3

d) 4

What is the advantage of a full wave bridge rectifier over a half wave rectifier?

a) It requires fewer diodes

b) It provides a higher DC voltage output

c) It is less complex

d) It is more efficient

Answer: b) It provides a higher DC voltage output

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

a) To reduce the ripple in the DC output

b) To increase the voltage of the AC input

c) To convert AC voltage to DC voltage

d) To provide a constant voltage output

Answer: a) To reduce the ripple in the DC output

What is the efficiency of a full wave bridge rectifier?

a) 25%

b) 50%

c) 75%

d) 81.2%

What is the RMS voltage of the AC input in a full wave bridge rectifier?

a) Peak voltage

b) Peak-to-peak voltage

c) Zero voltage

d) Peak voltage divided by the square root of 2

Answer: d) Peak voltage divided by the square root of 2

Which configuration of diodes is used in a full wave bridge rectifier?

a) Center-tap

b) Half wave

c) Full wave

d) Bridge

What is the output voltage of a full wave bridge rectifier with an input voltage of 12V RMS?

a) 6.12V DC

b) 7.32V DC

c) 9.75V DC

d) 12V DC

Answer: c) 9.75V DC (calculated as 12V RMS x 0.812)

What is the disadvantage of a full wave bridge rectifier?

a) It is less efficient than a half wave rectifier

b) It requires more diodes than a half wave rectifier

c) It produces a lower DC output voltage than a half wave rectifier

d) It is more complex than a half wave rectifier

Answer: b) It requires more diodes than a half wave rectifier

What is the rectification efficiency of a full wave bridge rectifier?

a) 50%

b) 75%

c) 81.2%

d) 100%

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

What is a full wave bridge rectifier?

Answer: A full wave bridge rectifier is a circuit that converts AC voltage into DC voltage. It is a type of rectifier that uses four diodes in a bridge configuration to rectify the AC voltage.

How does a full wave bridge rectifier differ from a full wave rectifier?

Answer: A full wave bridge rectifier uses four diodes in a bridge configuration, while a full wave rectifier uses two diodes in a center-tap configuration. The bridge rectifier is more efficient as it uses all four diodes to rectify the AC voltage.

What is the advantage of using a full wave bridge rectifier?

Answer: The advantage of using a full wave bridge rectifier is that it provides a higher DC output voltage and is more efficient compared to a half-wave rectifier or a full-wave rectifier.

What is the function of the transformer in a full wave bridge rectifier?

Answer: The transformer in a full wave bridge rectifier steps down the high voltage AC input to a lower voltage AC output, which is then rectified by the bridge rectifier to produce DC voltage.

What is the RMS voltage of the AC input in a full wave bridge rectifier?

Answer: The RMS voltage of the AC input in a full wave bridge rectifier is equal to the peak voltage divided by the square root of 2.

How is the output voltage of a full wave bridge rectifier calculated?

Answer: The output voltage of a full wave bridge rectifier is calculated as the RMS value of the input voltage multiplied by the rectification factor, which is equal to 0.812.

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

Answer: The purpose of the smoothing capacitor in a full wave bridge rectifier is to filter out the AC component from the rectified voltage, resulting in a smoother DC output.

What is the efficiency of a full wave bridge rectifier?

Answer: The efficiency of a full wave bridge rectifier is approximately 81.2%, which is higher than that of a half-wave rectifier or a full-wave rectifier.

What is the disadvantage of a full wave bridge rectifier?

Answer: The disadvantage of a full wave bridge rectifier is that it requires four diodes, which increases the cost and complexity of the circuit.

What are the applications of a full wave bridge rectifier?

Answer: The applications of a full wave bridge rectifier include power supplies for electronic devices, battery charging circuits, and motor control circuits.

### Bridge rectifier

A full wave bridge rectifier is an electronic circuit that converts AC (alternating current) voltage to DC (direct current) voltage. It is a type of full wave rectifier that uses a bridge configuration of four diodes to produce a DC output voltage from an AC input voltage. The circuit is named after the bridge-shaped configuration of the diodes. In this article, we will discuss the working principle, advantages, and applications of the full wave bridge rectifier. Working Principle: The full wave bridge rectifier circuit consists of four diodes connected in a bridge configuration. The AC input voltage is applied to the primary winding of a transformer. The secondary winding of the transformer is connected to the bridge rectifier circuit. During the positive half-cycle of the AC input voltage, diodes D1 and D2 conduct and diodes D3 and D4 are reverse-biased. As a result, the current flows through the load resistor in one direction, producing a positive half-cycle of the output voltage. During the negative half-cycle of the AC input voltage, diodes D3 and D4 conduct, and diodes D1 and D2 are reverse-biased. As a result, the current flows through the load resistor in the opposite direction, producing a negative half-cycle of the output voltage. The output voltage is the sum of the positive and negative half-cycles, which is a pulsating DC voltage. Advantages: The full wave bridge rectifier has several advantages over other types of rectifiers: Higher efficiency: The full wave bridge rectifier is more efficient than the half-wave rectifier because it uses both halves of the input waveform. Higher output voltage: The full wave bridge rectifier produces a higher output voltage than the half-wave rectifier because it uses the entire input waveform. No center-tapped transformer required: The full wave bridge rectifier does not require a center-tapped transformer, which reduces the cost and size of the transformer. Applications: The full wave bridge rectifier is widely used in electronic circuits where a high DC voltage is required. Some of the common applications of the full wave bridge rectifier are: Power supplies: The full wave bridge rectifier is used in power supplies to convert AC voltage to DC voltage. Battery chargers: The full wave bridge rectifier is used in battery chargers to charge the batteries. Welding machines: The full wave bridge rectifier is used in welding machines to convert AC voltage to DC voltage for welding purposes. LED drivers: The full wave bridge rectifier is used in LED drivers to convert AC voltage to DC voltage to power the LED. Motor controllers: The full wave bridge rectifier is used in motor controllers to convert AC voltage to DC voltage to power the motor. Conclusion: The full wave bridge rectifier is a widely used electronic circuit that converts AC voltage to DC voltage. It has several advantages over other types of rectifiers, including higher efficiency and higher output voltage. It is commonly used in power supplies, battery chargers, welding machines, LED drivers, and motor controllers. The full wave bridge rectifier is an essential component of many electronic circuits and is critical for many industrial and commercial applications.