boylestad electronics multiple choice q&a chapter (9)

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Your Results for: "Multiple Choice" Site Title: Electronic Devices and Circuit Theory Book Author: Boylestad Location on Site: Chapter 9 > Multiple Choice Date/Time October 12, 2012 at 12:42 AM (UTC/GMT) Submitted:

1.

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Summary of Results 29% Correct of 35 Score d ite m s: 10 C orre ct: 25 Incorre ct:

29% 71%

More inform ation about scoring

What is the ratio of the common logarithm of a number to its natural logarithm? Your Answer: 0.435 Correct Answer: 2.3

2.

log e a = _____ log10 a Your Answer: 2.718 Correct Answer: 2.3

3.

By what factor does an audio level change if the power level changes from 4 W to 4096 W? Your Answer: 4 Correct Answer: 6

4.

The input power to a device is 10,000 W at 1000 V. The output power is 500 W, and the output impedance is 100 . Find the voltage gain in decibels. Your Answer: –20.0 dB Correct Answer: –13.01 dB

5.

What magnitude voltage gain corresponds to a decibel gain of 50? Your Answer: 31623.8 Correct Answer: 316.228

6.

An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input power required for full power output if the power gain is 20 dB. Your Answer: 300 mW

7.

An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input voltage for the rated output if the amplifier voltage gain is 20 dB. Your Answer: 122.5 mV

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Correct Answer: 1.225 V

8.

For audio systems, the reference level is generally accepted as ________. Your Answer: 1 W Correct Answer: 1 mW

9.

For which of the following frequency region(s) can the coupling and bypass capacitors no longer be replaced by the short-circuit approximation? Your Answer: All of the above Correct Answer: Low-frequency

10.

By what other name(s) are the cutoff frequencies in a frequency response plot called? Your Answer: All of the above

11.

What is the ratio of the output power to the input power at the cutoff frequencies in a normalized frequency response plot? Your Answer: 0.707 Correct Answer: 0.50

12.

What is the ratio of the output voltage to the input voltage at the cutoff frequencies in a normalized frequency response plot? Your Answer: 1 Correct Answer: 0.707

13.

What is the normalized gain expressed in dB for the cutoff frequencies? Your Answer: +3 dB Correct Answer: –3 dB

14.

The ________-frequency response of a transformer-coupled system is calculated primarily by the stray capacitance between the turns of the primary and secondary windings. Your Answer: low Correct Answer: high

15.

The larger capacitive elements of the design will determine the ________ cutoff frequency. mid

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Your Answer: Correct Answer: low

16.

The smaller capacitive elements of the design will determine the ________ cutoff frequencies. Your Answer: high

17.

What is the ratio of the capacitive reactance XC S to the input resistance RI of the input RC circuit of a single-stage BJT amplifier at the low-frequency cutoff? Your Answer: 0.50 Correct Answer: 1.0

18.

In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage for frequencies much larger than the cutoff frequency in the low-frequency region? Your Answer: 45º Correct Answer: About 0º

19.

In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage at the cutoff frequency in the low-frequency region? Your Answer: 45º

20.

Determine the break frequency for this circuit.

Your Answer: 159.15 Hz

21.

Refer to Figure 9.19. Calculate

at 0.5f1 .

Your Answer: 26.56º Correct Answer: 63.43º

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A change in frequency by a factor of ________ is equivalent to 1 octave.

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Your Answer: 20 Correct Answer: 2

23.

A change in frequency by a factor of ________ is equivalent to 1 decade. Your Answer: 5 Correct Answer: 10

24.

For the low-frequency response of a BJT amplifier, the maximum gain is where ________ . Your Answer: RE = 0

25.

Which of the low-frequency cutoffs determined by C S, C C , or C E will be the predominant factor in determining the low-frequency response for the complete system? Your Answer: highest

26.

Determine the lower cutoff frequency of this network.

Your Answer: 1575.8 Hz Correct Answer: 238.73 Hz

27.

Which of the following elements is (are) important in determining the gain of the system in the high-frequency region? Your Answer: All of the above

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In the ________-frequency region, the capacitive elements of importance are the interelectrode (between terminals) capacitances internal to the active device and the wiring QLS

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capacitance between the leads of the network. Your Answer: high

29.

Which of the following capacitors is (are) included in C i for the high-frequency region of a BJT or FET amplifier? Your Answer: All of the above

30.

In the hybrid

or Giacoletto model, which one of the following does rb include?

Your Answer: Base bulk Correct Answer: All of the above

31.

Which of the following configurations does (do) not involve the Miller effect capacitance? Your Answer: All of the above Correct Answer: Common-base

32.

A 3-dB drop in h fe will occur at a frequency defined by ________. Your Answer: 2 Correct Answer:

33.

What is the range of the capacitors C gs and C gd ? Your Answer: 1 to 10 F Correct Answer: 1 to 10 pF

34.

What is the range of the capacitor C ds ? Your Answer: 0.1 to 1 F Correct Answer: 0.1 to 1 pF

35.

Which of the following statements is true for a square-wave signal? Your Answer: The harmonics waveforms are also square waves. Correct Answer: It is composed only of odd harmonics.

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