This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Bridge Rectifier”.

1. DC average current of a bridge full wave rectifier is _________

(Where I_{m} is the maximum peak current of input)

a) 2I_{m}/ᴨ

b) I_{m}/ᴨ

c) I_{m}/2ᴨ

d) 1.414I_{m}/ᴨ

View Answer

Explanation: Average DC current is the average current in the output of rectifier. For a bridge full wave rectifier, if a sinusoidal input is given output will contain only one half cycle repeatedly. So average current will be twice as half wave rectifier.

2. DC power output of bridge full wave rectifier is equal to _________

(I_{m} is the peak current and R_{L} is the load resistance)

a) (2I_{m}^{2}/ ᴨ^{2})R_{L}

b) (4I_{m}^{2}/ ᴨ^{2})R_{L}

c) (I_{m}^{2}/ ᴨ^{2})R_{L}

d) (I_{m}^{2}/2 ᴨ^{2})R_{L}

View Answer

Explanation: DC output power is the power output of the rectifier. It is equal to V

_{DC}xI

_{DC}.

We know V

_{DC}for a bridge rectifier is 2V

_{m}/ᴨ and I

_{DC}for a bridge rectifier is 2I

_{m}/ᴨ. We also know V

_{DC}= I

_{DC}/R

_{L}.

Hence output power is I

_{DC}

^{2}R

_{L}= (4I

_{m}

^{2}/ᴨ

^{2})R

_{L}.

3. Ripple factor of bridge full wave rectifier is _________

a) 1.414

b) 1.212

c) 0.482

d) 1.321

View Answer

Explanation: Ripple factor of a rectifier measures the ripples or AC content in the output. It is obtained by dividing AC rms output with DC output. For full wave bridge rectifier it is 0.482.

4. If input frequency is 50Hz then ripple frequency of bridge full wave rectifier will be equal to _________

a) 200Hz

b) 50Hz

c) 45Hz

d) 100Hz

View Answer

Explanation: Since in the output of bridge rectifier one half cycle is repeated hence frequency will twice as that of input frequency. That is 100Hz.

5. Transformer utilization factor of a bridge full wave rectifier is equal to _________

a) 0.62

b) 0.69

c) 0.81

d) 0.43

View Answer

Explanation: Transformer utilization factor is the ratio of AC power delivered to load to the DC power rating. This factor indicates effectiveness of transformer usage by rectifier. For bridge full wave rectifier it is equal to 0.81.

6. If peak voltage on a bridge full wave rectifier circuit is 5V and diode cut-in voltage is 0.7, then peak inverse voltage on diode will be _________

a) 4.3V

b) 5.7V

c) 10V

d) 5V

View Answer

Explanation: PIV is the maximum reveres bias voltage that can be appeared across a diode in the circuit. If PIV rating of the diode is less than this Value breakdown of diode may occur. Therefore, PIV rating of diode should be greater than PIV in the circuit. For bridge rectifier PIV is 5V.

7. Efficiency of bridge full wave rectifier is _________

a) 81.2%

b) 50%

c) 40.6%

d) 45.3%

View Answer

Explanation: It is obtained by taking ratio of DC power output to maximum AC power delivered to load. Efficiency of a rectifier is the effectiveness of rectifier to convert input power to DC. It is usually expressed in percentage. For bridge full wave rectifier, it is 81.2%.

8. In an bridge full wave rectifier, the input sine wave is 40sin100 ᴨt. The average output voltage is ________

a) 22.73V

b) 16.93V

c) 25.47V

d) 33.23V

View Answer

Explanation: The equation of sine wave is in the form E

_{m}sin wt.

Therefore, E

_{m}=40

Hence output voltage is 2E

_{m}/ᴨ. That is 80/ᴨ.

9. Number of diodes used in a full wave bridge rectifier is ________

a) 1

b) 2

c) 4

d) 6

View Answer

Explanation: The model of bridge rectifier is same as a Wien bridge circuit. Like a Wien bridge circuit needs 4 resistors, bridge rectifier needs 4 diodes while center tap configuration requires only one.

10. In an bridge full wave rectifier, the input sine wave is 250sin100 ᴨt. The output ripple frequency of rectifier will be ________

a) 50Hz

b) 200Hz

c) 100Hz

d) 25Hz

View Answer

Explanation: In a bridge full wave rectifier, the input sine wave is 250sin100 ᴨt Volts. The output ripple frequency of rectifier will be 100Hz.

**Sanfoundry Global Education & Learning Series – Analog Circuits.**

To practice all areas of Analog Circuits, __here is complete set of 1000+ Multiple Choice Questions and Answers__.