# 45 Lecture

## PHY301

### Midterm & Final Term Short Notes

## 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

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

a) 0.5

b) 0.637

c) 0.812

d) 1

**Answer: c) 0.812**

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

a) 1

b) 2

c) 3

**d) 4**

**Answer: 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%

**Answer: 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

**Answer: 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%**

**Answer: c) 81.2%**

**Subjective Short Notes**

Midterm & Finalterm Prepration

Past papers included

Download PDF
**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.