1. A half-wave rectifier allows current to pass through the load during:
A. The entire cycle of the input signal
B. The positive half-cycle of the input signal only
C. The negative half-cycle of the input signal only
D. Both the positive and negative half-cycles of the input signal
Answer: B. The positive half-cycle of the input signal only
2. In a half-wave rectifier, the average output voltage is:
A. Zero
B. Half of the peak voltage
C. Equal to the peak voltage
D. One-third of the peak voltage
Answer: B. Half of the peak voltage
3. In a half-wave rectifier, which component is used to allow current to pass in only one direction?
A. Capacitor
B. Inductor
C. Diode
D. Transformer
Answer: C. Diode
4. The main disadvantage of a half-wave rectifier is:
A. It does not use the entire input signal
B. It is inefficient
C. It produces a DC output
D. It requires more components
Answer: B. It is inefficient
5. The ripple frequency of a half-wave rectifier is:
A. Equal to the input frequency
B. Half of the input frequency
C. Double the input frequency
D. Zero
Answer: A. Equal to the input frequency
6. A full-wave rectifier allows current to pass through the load during:
A. Both the positive and negative half-cycles of the input signal
B. Only the positive half-cycle
C. Only the negative half-cycle
D. None of the above
Answer: A. Both the positive and negative half-cycles of the input signal
7. The output voltage of a full-wave rectifier is:
A. Zero during the negative half-cycle
B. Equal to the input voltage
C. A pulsating DC with twice the frequency of the input signal
D. A smooth DC with no ripple
Answer: C. A pulsating DC with twice the frequency of the input signal
8. In a full-wave rectifier, which component is used to reverse the direction of current flow in the negative half-cycle?
A. Capacitor
B. Inductor
C. Two diodes
D. Four diodes
Answer: C. Two diodes
9. The efficiency of a full-wave rectifier is:
A. Higher than that of a half-wave rectifier
B. Equal to that of a half-wave rectifier
C. Zero
D. Dependent on the load resistance
Answer: A. Higher than that of a half-wave rectifier
10. In a full-wave rectifier, the ripple frequency is:
A. The same as the input frequency
B. Double the input frequency
C. Half the input frequency
D. Zero
Answer: B. Double the input frequency
11. A bridge rectifier uses:
A. One diode
B. Two diodes
C. Four diodes
D. Three diodes
Answer: C. Four diodes
12. Which of the following is true about a bridge rectifier?
A. It only rectifies the positive half-cycle of the input signal
B. It produces a full-wave rectified output
C. It requires a transformer
D. It only uses two diodes
Answer: B. It produces a full-wave rectified output
13. The main advantage of a bridge rectifier over a full-wave rectifier with a center-tapped transformer is:
A. It is more efficient
B. It requires fewer diodes
C. It does not require a center-tapped transformer
D. It produces a smoother DC output
Answer: C. It does not require a center-tapped transformer
14. The efficiency of a bridge rectifier is similar to:
A. A half-wave rectifier
B. A full-wave rectifier
C. A center-tapped transformer rectifier
D. Both A and B
Answer: B. A full-wave rectifier
15. The ripple frequency of a bridge rectifier is:
A. Equal to the input frequency
B. Double the input frequency
C. Half the input frequency
D. Zero
Answer: B. Double the input frequency
16. In a bridge rectifier, during the negative half-cycle of the input AC, which diodes conduct?
A. Diodes 1 and 3
B. Diodes 2 and 4
C. Diodes 1 and 4
D. Diodes 2 and 3
Answer: B. Diodes 2 and 4
17. The efficiency of a half-wave rectifier is approximately:
A. 40.6%
B. 50%
C. 80%
D. 100%
Answer: A. 40.6%
18. The primary purpose of a rectifier circuit is to:
A. Convert AC to DC
B. Filter DC signals
C. Amplify AC signals
D. Convert DC to AC
Answer: A. Convert AC to DC
19. Which of the following is used to smooth the output of a rectifier circuit?
A. Diode
B. Transformer
C. Capacitor
D. Inductor
Answer: C. Capacitor
20. In a rectifier circuit, the peak inverse voltage (PIV) is the maximum voltage a diode can withstand when it is:
A. Forward biased
B. Reverse biased
C. Connected to a load
D. Open circuit
Answer: B. Reverse biased