Malvino Chapter 4

Chapter 4 

1. If N1/N2 = 2, and the primary voltage is 120 V, what is 
the secondary voltage? 
a. 0 V 
b. 36 V 
c. 60 V 
d. 240 V 

2. In a step-down transformer, which is larger? 
a. Primary voltage 
b. Secondary voltage 
c. Neither 
d. No answer possible 

3. A transformer has a turns ratio of 4: 1. What is the 
peak secondary voltage if 115 V rms is applied to the 
primary winding? 
a. 40.7 V 
b. 64.6 V 
c. 163 V 
d. 650 V 

4. With a half-wave rectified voltage across the load 
resistor, load current flows for what part of a cycle? 
a. 0 degrees 
b. 90 degrees 
c. 180 degrees 
d. 360 degrees 

5. Line voltage may be from 105 V rms to 125 rms in a 
half-wave rectifier. With a 5:1 step-down transformer, the 
maximum peak load voltage is closest to 
a. 21 V 
b. 25 V 
c. 29.6 V 
d. 35.4 V 

6. The voltage out of a bridge rectifier is a 
a. Half-wave signal 
b. Full-wave signal 
c. Bridge-rectified signal 
d. Sine wave 

7. If the line voltage is 115 V rms, a turns ratio of 5: 1 
means the rms secondary voltage is closest to 
a. 15 V 
b. 23 V 
c. 30 V 
d. 35 V 

8. What is the peak load voltage in a full-wave rectifier if 
the secondary voltage is 20 V rms? 
a. 0 V 
b. 0.7 V 
c. 14.1 V 
d. 28.3 V 

9. We want a peak load voltage of 40 V out of a bridge 
rectifier. What is the approximate rms value of 
secondary voltage? 
a. 0 V 
b. 14.4 V 
c. 28.3 V 
d. 56.6 V 

10. With a full-wave rectified voltage across the load 
resistor, load current flows for what part of a cycle? 
a. 0 degrees 
b. 90 degrees 
c. 180 degrees 
d. 360 degrees 

11. What is the peak load voltage out of a bridge rectifier 
for a secondary voltage of 15 V rms? (Use second 
approximation.) 
a. 9.2 V 
b. 15 V 
c. 19.8 V 
d. 24.3 V 

12. If line frequency is 60 Hz, the output frequency of a 
half-wave rectifier is 
a. 30 Hz 
b. 60 Hz 
c. 120 Hz 
d. 240 Hz 

13. If line frequency is 60 Hz, the output frequency of a 
bridge rectifier is 
a. 30 Hz 
b. 60 Hz 
c. 120 Hz 
d. 240 Hz 

14. With the same secondary voltage and filter, which 
has the most ripple? 
a. Half-wave rectifier 
b. Full-wave rectifier 
c. Bridge rectifier 
d. Impossible to say 

15. With the same secondary voltage and filter, which 
produces the least load voltage? 
a. Half-wave rectifier 
b. Full-wave rectifier 
c. Bridge rectifier 
d. Impossible to say 

16. If the filtered load currentis 10 mA, which of the 
following has a diode current of 10 mA? 
a. Half-wave rectifier 
b. Full-wave rectifier 
c. Bridge rectifier 
d. Impossible to say 

17. If the load current is 5 mAand the filter capacitance is 
1000uF, what is the peak-to-peak ripple out of a bridge 
rectifier? 
a. 21.3 pV 
b. 56.3 nV 
c. 21.3 mV 
d. 41.7 mV 

18. The diodes in a bridge rectifier each have a maximum 
dc current rating of 2 A. This means the dc load current 
can have a maximum value of 
a. 1 A 
b. 2 A 
c. 4 A 
d. 8 A 

19. What is the PIV across each diode of a bridge 
rectifier with a secondary voltage of 20 V rms? 
a. 14.1 V 
b. 20 V 
c. 28.3 V 
d. 34 V 

20. If the secondary voltage increases in a bridge rectifier 
with a capacitor-input filter, the load voltage will 
a. Decrease 
b. Stay the same 
c. Increase 
d. None of these 

21. If the filter capacitanceis increased, the ripple will 
a. Decrease 
b. Stay the same 
c. Increase 
d. None of these 




Also try:

Malvino Chapter 1
Malvino Chapter 2
Malvino Chapter 3
Malvino Chapter 5
Malvino Chapter 6
Malvino Chapter 7
Malvino Chapter 8
Malvino Chapter 9
Malvino Chapter 10
Malvino Chapter 11
Malvino Chapter 12
Malvino Chapter 13
Malvino Chapter 14
Malvino Chapter 15
Malvino Chapter 16
Malvino Chapter 17
Malvino Chapter 18
Malvino Chapter 19
Malvino Chapter 20
Malvino Chapter 21
Malvino Chapter 22
Malvino Chapter 23
Malvino Chapter 24