boylestad electronics multiple choice q&a chapter (1)

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Site Title: Electronic Devices and Circuit Theory Book Author: Boylestad Location on Site: Chapter 1 > Multiple Choice Date/Time August 18, 2012 at 10:51 AM (UTC/GMT) Submitted:

1.

Summary of Results 31% Correct of 35 Score d ite m s: 11 C orre ct:

31%

24 Incorre ct:

More inform ation about scoring

How many terminals does a diode have? Your Answer: 1 Correct Answer: 2

2.

What is the resistor value of an ideal diode in the region of conduction? Your Answer: 0

3.

What is the state of an ideal diode in the region of nonconduction? Your Answer: An open circuit

4.

The diode _____. Your Answer: is the simplest of semiconductor devices Correct Answer: All of the above

5.

The ideal diode is a(n) _____ circuit in the region of nonconduction. Your Answer: open

6.

Which of the following is an atom composed of? Your Answer: Electrons Correct Answer: All of the above

7.

How many orbiting electrons does the germanium atom have? Your Answer: 4 Correct Answer: 32

69%

8.

How many valence electrons does a silicon atom have? Your Answer: 1 Correct Answer: 4

9.

One eV is equal to _____ J. Your Answer: 6.02 × 10 23 Correct Answer: 1.6 × 10 –19

10.

Which of the following elements is most frequently used for doping pure Ge or Si? Your Answer: Boron Correct Answer: All of the above

11.

The diffused impurities with _____ valence electrons are called donor atoms. Your Answer: 4 Correct Answer: 5

12.

In what state is a silicon diode if the voltage drop across it is about 0.7 V? Your Answer: No bias Correct Answer: Forward bias

13.

What unit is used to represent the level of a diode forward current IF? Your Answer: pA Correct Answer: mA

14.

Which of the following ratings is true? Your Answer: Si diodes have higher PIV and narrower temperature ranges than Ge diodes. Correct Answer: Si diodes have higher PIV and wider temperature ranges than Ge diodes.

15.

It is not uncommon for a germanium diode with an Is in the order of 1–2 leakage current of 0.1 mA at a temperature of 100°C. Your Answer: True

A at 25°C to have

16.

Calculate static resistance RD of a diode having ID = 30 mA and VD = 0.75 V. Your Answer: 25

17.

Calculate ID if RD = 30

and VD = 0.84 V.

Your Answer: 28 mA

18.

Refer to Figure 1.27. Calculate the dynamic resistance rd of a diode having ID = 27.5 mA. Your Answer: 0 Correct Answer: 2

19.

Determining rd to a high degree of accuracy from a characteristic curve is very accurate. Your Answer: True Correct Answer: False

20.

The _____ diode model is employed most frequently in the analysis of electronic systems. Your Answer: ideal device Correct Answer: simplified

21.

Calculate the power dissipation of a diode having ID = 40 mA. Your Answer: 28 mW

22.

Which capacitance dominates in the reverse-bias region? Your Answer: depletion

23.

Which capacitance dominates in the forward-bias region? Your Answer: Diffusion

24.

At what kind of operating frequency diffusion or transition is a capacitor represented in parallel with the ideal diode? Your Answer: Low frequency Correct Answer: Very high frequency

25.

What is the value of the transition capacitance for a silicon diode when VD = 0? (Choose the best answer.) Your Answer: 1 pF Correct Answer: 3 pF

26.

Which of the following devices can check the condition of a semiconductor diode? Your Answer: Digital display meter (DDM) Correct Answer: All of the above

27.

What does a high resistance reading in both forward- and reverse-bias directions indicate? Your Answer: A good diode Correct Answer: An open diode

28.

The condition of a semiconductor diode can be determined quickly using a _____. Your Answer: DDM Correct Answer: Any of the above

29.

Determine the nominal voltage for the Zener diode at a temperature of 120° C if the nominal voltage is 5.1 volts at 25° C and the temperature coefficient is 0.05%/° C. Your Answer: 4.6 V Correct Answer: 5.34 V

30.

Calculate the temperature coefficient in %/° C of a 10-V nominal Zener diode at 25° C if the nominal voltage is 10.2 V at 100° C. Your Answer: 0.0238 Correct Answer: 0.0267

31.

In which of the following color(s) is (are) LEDs presently available? Your Answer: Yellow Correct Answer: All of the above

32.

What is the maximum power rating for LEDs?

Your Answer: 150 mW

33.

In which of the following is the light intensity measured? Your Answer: Candela

34.

What is the range of the operating voltage level for LEDs? Your Answer: 5–12 mV Correct Answer: 1.7–3.3 V

35.

In general, LEDs operate at voltage levels from _____ V to _____ V. Your Answer: 1.0, 3.0 Correct Answer: 1.7, 3.3

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