Floyd Self-test Chapter 2 Topic Outline
- Floyd Self-test in Diode Operation
- Floyd Self-test in Voltage-Current (V-I) Characteristics of a Diode
- Floyd Self-test in Diode Models
- Floyd Self-test in Half-Wave Rectifiers
- Floyd Self-test in Full-Wave Rectifiers
- Floyd Self-test in Power Supply Filters and Regulators
- Floyd Self-test in Diode Limiters and Clampers
- Floyd Self-test in Voltage Multipliers
- Floyd Self-test in The Diode Datasheet
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. The average value of a half-wave rectified voltage with a peak value of 200 V is
- (a) 63.7 V
- (b) 127.2 V
- (c) 141 V
- (d) 0 V
2. When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
- (a) 120 Hz
- (b) 30 Hz
- (c) 60 Hz
- (d) 0 Hz
3. The peak value of the input to a half-wave rectifier is 10 V. The approximate peak value of the output is
- (a) 10 V
- (b) 3.18 V
- (c) 10.7 V
- (d) 9.3 V
4. For the circuit in the previous question, the diode must be able to withstand a reverse voltage of
- (a) 10 V
- (b) 5 V
- (c) 20 V
- (d) 3.18 V
5. The average value of a full-wave rectified voltage with a peak value of 75 V is
- (a) 53 V
- (b) 47.8 V
- (c) 37.5 V
- (d) 23.9 V
6. When a 60 Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is
- (a) 120 Hz
- (b) 60 Hz
- (c) 240 Hz
- (d) 0 Hz
7. The total secondary voltage in a center-tapped full-wave rectifier is 125 V rms. neglecting the diode drop, the rms output voltage is
- (a) 125 V
- (b) 177 V
- (c) 100 V
- (d) 62.5 V
8. When the peak output voltage is 100 V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)
- (a) 100 V
- (b) 200 V
- (c) 141 V
- (d) 50 V
9. When the rms output voltage of a bridge full-wave rectifier is 20 V, the peak inverse voltage across the diodes is (neglecting the diode drop)
- (a) 20 V
- (b) 40 V
- (c) 28.3 V
- (d) 56.6 V
10. The ideal dc output voltage of a capacitor-input filter is equal to
- (a) the peak value of the rectified voltage
- (b) the average value of the rectified voltage
- (c) the rms value of the rectified voltage
11. A certain power-supply filter produces an output with a ripple of 100 mV peak-to-peak and adc value of 20 V. The ripple factor is
- (a) 0.05
- (b) 0.005
- (c) 0.00005
- (d) 0.02
12. A 60 V peak full-wave rectified voltage is applied to a capacitor-input filter. If f = 120 Hz, RL= 10 kΩ, and C = 10µF, the ripple voltage is
- (a) 0.6 V
- (b) 6 mV
- (c) 5.0 V
- (d) 2.88 V
13. If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage
- (a) increases
- (b) decreases
- (c) is not affected
- (d) has a different frequency
14. Line regulation is determined by
- (a) load current
- (b) zener current and load current
- (c) changes in load resistance and output voltage
- (d) changes in output voltage and input voltage
15. Load regulation is determined by
- (a) changes in load current and input voltage
- (b) changes in load current and output voltage
- (c) changes in load resistance and input voltage
- (d) changes in zener current and load current
16. A 10 V peak-to-peak sinusoidal voltage is applied across a silicon diode and series resistor. The maximum voltage across the diode is
- (a) 9.3 V
- (b) 5 V
- (c) 0.7 V
- (d) 10 V
- (e)4.3 V
17. In a certain biased limiter, the bias voltage is 5 V and the input is a 10 V peak sine wave. If the positive terminal of the bias voltage is connected to the cathode of the diode, the maximum voltage at the anode is
- (a) 10 V
- (b) 5 V
- (c) 5.7 V
- (d) 0.7 V
18. In a certain positive clamper circuit, a 120 V rms sine wave is applied to the input. The dc value of the output is
- (a)119.3 V
- (b) 169 V
- (c) 60 V
- (d) 75.6 V
19. If the input voltage to a voltage tripler has an rms value of 12 V, the dc output voltage is approximately
- (a) 36 V
- (b) 50.9 V
- (c) 33.9 V
- (d) 32.4 V
20. In a rectifier circuit, if the secondary winding in the transformer opens, the output is
- (a) 0 V
- (b) 120 V
- (c) less than it should be
- (d) unaffected
21. If one of the diodes in a bridge full-wave rectifier opens, the output is
- (a) 0 V
- (b) one-fourth the amplitude of the input voltage
- (c) a half-wave rectified voltage
- (d) a 120 Hz voltage
22. If you are checking a 60 Hz full-wave bridge rectifier and observe that the output has a 60 Hz ripple,
- (a) the circuit is working properly
- (b) there is an open diode
- (c) the transformer secondary is shorted
- (d) the filter capacitor is leaky
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