 Boylestad: MCQ in Diode Applications

(Last Updated On: August 10, 2019)

This is the Multiple Choice Questions in Diode Applications from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Online Questions and Answers Topic Outline

• MCQ in Load-Line Analysis
• MCQ in Diode Approximations
• MCQ in Series Diode Configurations with DC Inputs
• MCQ in Parallel and Series-Parallel Configurations
• MCQ in AND/OR Gates
• MCQ in Sinusoidal Inputs; Half-Wave Rectification
• MCQ in Full-Wave Rectification
• MCQ in Clippers
• MCQ in Clampers
• MCQ in Zener Diodes
• MCQ in Voltage-Multiplier Circuits

Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Use the information provided here to determine the value of IDQ. A) 0 mA

B) 4.3 mA

C) 5 mA

D) 10 mA

Solution:

2. In a particular problem, which mode has the highest level of IDQ?

A) Ideal

B) Approximate equivalent

C) Exact mode using characteristic curve

D) None of the above

Solution:

3. Which diode(s) has (have) a zero level current and voltage drop in the ideal model?

A) Si

B) Ge

C) Both Si and Ge

D) Neither Si nor Ge

Solution:

4. Determine the current level if E = 15 V and R = 3 kΩ. A) 0 A

B) 4.76 mA

C) 5 mA

D) 5 A

Solution:

5. Determine the voltage across the resistor. A) 0 V

B) 0.09 V

C) 0.2 V

D) 0.44 V

Solution:

6. Determine the value of the load resistor. A) RL = 5 kΩ

B) RL = 5.5 kΩ

C) RL = 6 kΩ

D) None of the above

Solution:

A) 0 mA

B) 1.893 mA

C) 2.036 mA

D) 2.143 mA

Solution:

A) 3.201 V

B) 0 V

C) 4.3 V

D) 1.371 V

Solution:

9. A diode is in the “_____” state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and VD ≥ 0.7 V for Si and VD ≥ 0.3 V for Ge.

A) off

B) on

C) neutral

D) quiescent

Solution:

10. An open circuit can have any voltage across its terminals, but the current is always ________.

A) 5 A

B) 0 A

C) 1 A

D) ∞

Solution:

11. A short circuit has a _____ drop across its terminals, and the current is limited only by the surrounding network.

A) 5 V

B) 0 V

C) 1 V

D) ∞

Solution:

A) 29.40 mA

B) 30.30 mA

C) 14.70 mA

D) None of the above

Solution:

A) 0 mA

B) 29.40 mA

C) 14.70 mA

D) 14.09 mA

Solution:

A) 6.061 mA

B) 0.7 mA

C) 3.393 mA

D) 3.571 mA

Solution:

15. Determine the current through each diode if E1 = E2 = 0 V. A) 4.65 mA

B) 9.3 mA

C) 18.6 mA

D) 0.7 mA

Solution:

16. Determine Vo if E1 = E2 = 10 V. A) 9.3 V

B) 10 V

C) –10 V

D) 0 V

Solution:

17. What is the logic function of this circuit? A) Positive logic AND gate

B) Positive logic OR gate

C) Negative logic AND gate

D) Negative logic OR gate

Solution:

18. What is the logic function of this circuit? A) Positive logic AND gate

B) Positive logic OR gate

C) Negative logic AND gate

D) Negative logic OR gate

Solution:

19. What best describes the circuit? A) Full-wave rectifier

B) Half-wave rectifier

C) Clipper

D) Clamper

Solution:

20. Determine the peak value of the current through the load resistor. A) 2.325 mA

B) 5 mA

C) 1.25 mA

D) 0 mA

Solution:

21. Determine the average value of the current through the load resistor. A) 2.5 mA

B) 0 mA

C) 1.37 mA

D) 1.479 mA

Solution:

22. What best describes the circuit? A) Full-wave rectifier

B) Half-wave rectifier

C) Clipper

D) Clamper

Solution:

23. List the categories of clippers.

A) Series

B) Parallel

C) Series and parallel

D) None of the above

Solution:

24. Determine the peak value of the output waveform. A) 25 V

B) 15 V

C) –25 V

D) –15 V

Solution:

25. Determine the peak for both half cycles of the output waveform. A) 16 V, –4 V

B) 16 V, 4 V

C) –16 V, 4 V

D) –16 V, –4 V

Solution:

26. What best describes the circuit? A) Full-wave rectifier

B) Half-wave rectifier

C) Clipper

D) Clamper

Solution:

27. Determine the total discharge time for the capacitor in a clamper having C = 0.01 µF and R = 500 kΩ.

A) 5 ms

B) 25 ms

C) 2.5 ms

D) 50 ms

Solution:

A) 2 mA, 0 mA

B) 4 mA, 2 mA

C) 2 mA, 2 mA

D) 2 mA, 4 mA

Solution:

29. With this Zener diode in its “on state,” what is the level of IZ for the maximum load resistance? A) 0 mA

B) Undefined

C) Equal to IRL

D) IZM

Solution:

30. In a voltage regulator network with fixed RL and R, what element dictates the minimum level of source voltage?

A) VZ

B) IZ

C) IZM

D) None of the above

Solution:

31. Which element dictates the maximum level of source voltage? A) VZ

B) IZM

C) IZ

D) None of the above

Solution:

32. What is the peak inverse voltage across each diode in a voltage doubler?

A) Vm

B) 2 Vm

C) 0.5 Vm

D) 0.25 Vm

Solution:

33. What is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer? A) –10 V

B) –20 V

C) 10 V

D) 20 V

Solution:

34. In a voltage-multiplier circuit, the number of diodes is directly proportional to the multiplicative voltage factor.

A) True

B) False

Solution:

35. Rectifiers are commonly used in battery chargers.

A) True

B) False

Solution:

Fill-in-the-blanks Questions

1. The intersection of the load line with the characteristic curve determines the _______ of the system.

A) point of operation

C) characteristic curve

D) forward bias

Solution:

2. The slope of the load line depends on the _______.

A) type of the diode used

B) characteristic curve

D) source voltage

Solution:

3. The load line is defined by the _______ and a characteristic curve is defined by the _______.

A) quiescent point, device

B) device, network

C) network, device

D) None of the above

Solution:

4. The quiescent point (Q-point) is defined by a(n) _______.

A) ac network

B) dc network

C) ac and dc network

D) None of the above

Solution:

5. The x-intercept of the load line with the characteristic curve is determined by the _______.

B) diode

C) source voltage and the load resistor

D) source voltage

Solution:

6. The source voltage must be _______ the voltage drop across the diode to conduct the diode.

A) larger than

B) smaller than

C) the same as

D) None of the above

Solution:

7. As the load resistor increases, the slope of the dc load line and the levels of diode current ______.

A) increase

B) decrease

C) remain unchanged

D) are unpredictable

Solution:

8. A germanium diode is approximated by _______ equivalent for voltages less than 0.3 V.

A) a short circuit

B) a series circuit

C) a parallel circuit

D) an open circuit

Solution:

9. A diode is in the _______ state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol and VD > 0.7 V.

A) off

B) reverse bias

C) on

D) transition

Solution:

10. The combination of a short circuit in series with an open circuit always results in a(n) _______ circuit.

A) open

B) short

C) neither short nor open

D) unknown

Solution:

11. The absence of the Si or Ge and VD label on a diode denotes _______ notation.

A) approximate model

B) ideal model

C) exact model

D) None of the above

Solution:

12. The process of removing one-half the input signal to establish a dc level is called _______.

A) rectifier

B) full-wave rectifier

C) half-wave rectifier

D) filtering

Solution:

13. The dc voltage level of a silicon diode is _______ its ideal model.

A) smaller than

B) larger than

C) the same as

D) None of the above

Solution:

14. The PIV rating of the diodes in a full-wave rectifier must be larger than _______ Vm.

A) 0.318

B) 0.636

C) 2

D) 1

Solution:

15. For the ideal diode the transition between states will occur at the point on the characteristic curve when VD = _______ V and ID = _______ A.

A) 0.3, 0

B) 0, 0

C) 0.7, 0

D) 0.7, 0.3

Solution:

16. A clamping network must have _______.

A) a capacitor

B) a diode

C) a resistive element

D) All of the above

Solution:

17. The ratio of the total swing of the output of a clamper to its input total swing is _______.

A) 1

B) 2

C) 0.5

D) 0

Solution:

18. For the “off” state of a Zener diode, the voltage across the diode should be _______.

A) greater than VZ

B) zero

C) less than VZ but greater than zero

D) None of the above

Solution:

19. Once the Zener diode is in the “on” state, VZ is always _______ VL. A) larger than

B) smaller than

C) the same as

D) None of the above

Solution:

20. Zener diodes are used in regulator networks to _______.

A) generate voltage

B) consume power

C) maintain a fixed voltage across the load resistor

D) protect the load

Solution:

21. With the Zener diode in the “on” state, increasing IL will _____ IZ and _____IR. A) decrease, increase

B) increase, decrease

C) decrease, keep the same level of

D) increase, keep the same level of

Solution:

22. A Zener diode is in a _______ impedance region in the forward bias while it has a _______ impedance region in the reverse bias.

A) very large, low

B) very large, very large

C) low, low

D) low, very large

Solution:

23. In a half-wave voltage doubler, the voltage across output capacitor C2 drops across the load during the _____ half cycle and the capacitor is recharged up to _____ during the _____ half cycle. A) negative, 2Vm, positive

B) positive, Vm, negative

C) positive, 2Vm, negative

D) negative, Vm, positive

Solution:

24. The full-wave voltage doubler provides _______ filtering action than (as) the half-wave voltage doubler.

A) better

B) poorer

C) the same

D) None of the above

Solution:

25. In this voltage multiplier, measuring from the top of the transformer winding will provide ________ multiples of Vm at the output, whereas measuring the output voltage from the bottom of the transformer will provide ________ multiples of the peak Vm. A) odd, even

B) even, odd

C) odd, odd

D) even, even