Rectifiers MCQs Quiz Multiple Choice Questions & Answers

1. In a half wave rectifier, the load current flows for what part of the cycle.

1. 900
2. 1800
3. 3600
4. 400

2. A half wave rectifier is equivalent to

1. a clipper circuit
2. a clamper circuit with negative bias
3. a clamper circuit with positive bias
4. clamper circuit

3. If the line frequency is 50 Hz, the output frequency of bridge rectifier is

1. 50 Hz
2. 100 Hz
3. 200 Hz
4. 25 Hz

4. in a full wave rectifier, if the input frequency is 50 Hz, then output frequency will be

1. 75 Hz
2. 100 Hz
3. 200 Hz
4. 50 Hz

5. In a full wave rectifier, the current in each diode flows for

1. half cycle of the input signal
2. more than half cycle of the input signal
3. none of these
4. whole cycle of the input signal

6. In a LC filter, the ripple factor

1. increases with the load resistance
2. remains constant with the load current
3. has the lowest value
4. Increases with the load current

7. In a rectifier, larger the value of shunt capacitor filter

1. larger the peak current in the rectifying diode
2. longer the time that current pulse flows through the diode
3. smaller the dc voltage across the load
4. larger the peak-to-peak value of ripple voltage

8. The basic purpose of filter is to

1. suppress harmonics in rectified output
2. remove ripples from the rectified output
3. stabilize dc output voltage
4. minimize variations in ac input signal

9. The basic reason why a full wave rectifier has a twice the efficiency of a half wave rectifier is that

1. its ripple factor is much less
2. it utilizes both half-cycle of the input
3. its output frequency is double the line frequency
4. it makes use of transformer

10. The bridge rectifier is preferred to an ordinary two diode full wave rectifier because

1. no center tap required
2. less PIV rating per diode
3. all the above
4. it needs much smaller transformer for the same output

11. The main reason why a bleeder resistor is used in a dc power supply is that it

1. improves voltage regulation
2. improves filtering action
3. both (b) and (c)
4. keeps the supply ON

12. The maximum efficiency of full wave rectification is

1. 100%
2. 81.20%
3. 85.60%
4. 40.60%

13. The ripple factor of a bridge rectifier is

1. 0.812
2. 1.11
3. 1.21
4. 0.482

14. The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load

1. current is low
2. voltage is high
3. voltage is low
4. current is high

15. To get a peak loa d voltage of 40V out of a bridge rectifier. What is the approximate rms value of secondary voltage?

1. 14.4 V
2. 28.3 V
3. 56.6 V
4. 0 V

16. Which rectifier requires four diodes?

1. full-wave voltage doubler
2. full-wave bridge circuit
3. voltage quadrupler
4. half-wave voltage doubler