Multiple Choice Questions Topic Outline
- MCQs in Diode Operation
- MCQs in Voltage-Current (V-I) Characteristics of a Diode
- MCQs in Diode Models
- MCQs in Half-Wave Rectifiers
- MCQs in Full-Wave Rectifiers
- MCQs in Power Supply Filters and Regulators
- MCQs in Diode Limiters and Clampers
- MCQs in Voltage Multipliers
- MCQs in The Diode Datasheet
- MCQs in GreenTech Application 2: Solar Power
Begin and Good luck!
1. If the ac supply is 60 Hz, what will be the ripple frequency out of the half-wave rectifier?
- A) 30 Hz
- B) 50 Hz
- C) 60 Hz
- D) 120 Hz
2. If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier?
- A) 50 Hz
- B) 60 Hz
- C) 100 Hz
- D) 120 Hz
3. A silicon diode in a half-wave rectifier has a barrier potential of 0.7 V. This has the effect of
- A) reducing the peak output voltage by 0.7 V.
- B) increasing the peak output voltage by 0.7 V.
- C) reducing the peak input voltage by 0.7 V.
- D) no effect.
4. In a regulated supply, what term describes how much change occurs in the output voltage for a given change in the input voltage?
- A) load regulation
- B) voltage regulator
- C) line regulation
- D) ripple voltage
5. In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current?
- A) line regulation
- B) voltage regulator
- C) current regulator
- D) load regulation
6. PIV is which of the following?
- A) peak input voltage
- B) peak inverse voltage
- C) peak immediate voltage
- D) positive input voltage
7. Refer to Figure 2-1. The probable trouble, if any, indicated by these voltages is
Figure 2-1
- A) one of the diodes is open.
- B) a diode is shorted.
- C) an open transformer secondary.
- D) the filter capacitor is shorted.
- E) no trouble exists.
8. Refer to Figure 2-1. If the voltmeter across the transformer reads 0 V, the probable trouble, if any, would be
- A) one of the diodes is open.
- B) a diode is shorted.
- C) an open transformer secondary.
- D) the filter capacitor is shorted.
- E) no trouble exists.
9. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a properly operating half-wave rectifier without a filter?
Figure 2-2.
Assume that each scope has the same settings
10. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a properly operating full-wave rectifier with a filter?
11. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a full-wave filtered rectifier with an open diode?
12. Refer to Figure 2-2. The oscilloscope trace in (b) could represent the output from
- A) a full-wave rectifier (no filter) with an open diode.
- B) a normal half-wave power supply.
- C) a filtered full-wave rectifier with an open diode.
- D) a full-wave rectifier with a shorted diode.
13. Refer to the circuit in Figure 2-3(a). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
Figure 2-3
Figure 2-4
14. Refer to the circuit in Figure 2-3(b). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
15. Refer to the circuit in Figure 2-3(c). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
16. Refer to the circuit in Figure 2-3(d). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
17. Refer to Figure 2-5. Which diode arrangement will supply a negative output voltage?
Figure 2-5
18. Refer to Figure 2-5. Which diode arrangement will supply a positive output voltage?
19. A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is
- A) open.
- B) shorted.
- C) forward-biased.
- D) reverse-biased.
20. The output frequency of a half-wave rectifier is _____ the input frequency.
- A) one-half
- B) twice
- C) equal to
- D) none of the above
21. Each diode in a center-tapped full-wave rectifier is _____ -biased and conducts for _____ of the input cycle.
- A) forward, 90º
- B) reverse, 180º
- C) forward, 180º
- D) reverse, 90º
22. The output frequency of a full-wave rectifier is _____ the input frequency.
- A) one-half
- B) equal to
- C) twice
- D) one-quarter
23. What is the PIV for each diode in a full-wave center-tapped rectifier? Note: Vp(out) = peak output voltage.
- A) Vp(out) – 0.7 V
- B) Vp(out) + 0.7 V
- C) 2Vp(out) – 0.7 V
- D) 2Vp(out) + 0.7 V
24. In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by _____ the value of the filter capacitor or _____ the load resistors.
- A) decreasing, decreasing
- B) decreasing, increasing
- C) increasing, decreasing
- D) increasing, increasing
25. What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
- A) clipper or limiter
- B) clamper
- C) IC voltage regulator
- D) none of the above
26. What type of diode circuit is used to add or restore a dc level to an electrical signal?
- A) clipper or limiter
- B) clamper
- C) IC voltage regulator
- D) none of the above
27. What is the VRRM (PIV rating) for the 1N4001 rectifier diode?
- A) 50 V
- B) 100 V
- C) 200 V
- D) 400 V
- E) none of the above
28. How many terminals do the 7800 series fixed positive voltage regulators have?
- A) 2
- B) 3
- C) 4
- D) 5
- E) none of the above
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