boylestad electronics multiple choice q&a chapter (10)

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Site Title: Electronic Devices and Circuit Theory

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Book Author: Boylestad

23% Correct of 35 Score d ite m s:

Location on Site: Chapter 10 > Multiple Choice Date/Time August 18, 2012 at 10:57 AM (UTC/GMT) Submitted:

1.

8 C orre ct: 27 Incorre ct:

In which of the following are operational amplifiers (op-amps) used? Your Answer: Oscillators

This circuit is an example of a _____.

Your Answer: single-ended input

3.

This circuit is an example of a _____.

Your Answer: single-ended input Correct Answer: double-ended (differential) input

4.

This circuit is an example of a _____.

77%

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Correct Answer: All of the above

2.

23%

Your Answer: single-ended input Correct Answer: double-ended output

5.

This circuit is an example of a _____.

Your Answer: single-ended input Correct Answer: common-mode operation

6.

In which of the following operations is the resulting output signal of the differential amplifier near zero? Your Answer: Single-ended Correct Answer: Common-mode

7.

In the differential amplifier circuit, which of the following terminals are connected together? Your Answer: Bases Correct Answer: Emitters

8.

Which of the following circuits is referred to as a BiMOS circuit? Your Answer: Bipolar and FET Correct Answer: Bipolar and MOSFET

9.

An IC unit made using both _____ and _____ transistors is called a _____ circuit. Your Answer: bipolar, MOSFET, BiFET Correct Answer: bipolar, MOSFET, BiMOS

10.

What is the level of the voltage between the input terminals of an op-amp? Your Answer: Virtually zero

11.

What is the level of the current through the amplifier input(s) to ground in an op-amp? Your Answer: Virtually zero

12.

If Rf = R1 , the voltage gain is _____.

Your Answer: 1 Correct Answer: –1

13.

Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k .

Your Answer: –1 Correct Answer: –10

14.

Calculate the overall voltage gain of the circuit if R1 = 100

Your Answer: –1 Correct Answer: 11

and Rf = 1 k .

15.

What is the voltage gain of the unity follower? Your Answer: 0 Correct Answer: 1

16.

Calculate the input voltage if R1 = 100

, Rf = 1 k , and Vout = 550 mV.

Your Answer: –50 mV Correct Answer: 50 mV

17.

Calculate the output voltage if R1 = R2 = R3 = 100

, Rf = 1 k , and V1 = V2 = V3 = 50 mV.

Your Answer: –1.5 V

18.

What is the scale multiplier (factor) of a basic integrator? Your Answer: R / C Correct Answer: –1 / RC

19.

The summing amplifier contains an inverting amplifier. Your Answer: True

20.

This circuit is referred to as a(n) _____.

Your Answer: inverting amplifier

21.

This circuit is referred to as a(n) _____.

Your Answer: inverting amplifier Correct Answer: integrator

22.

This circuit is referred to as a(n) _____.

Your Answer: inverting amplifier Correct Answer: differentiator

23.

Which of the following circuit conditions affect(s) the output offset voltage of an op-amp? Your Answer: An input offset voltage, VIO Correct Answer: Both an input offset voltage, VIO and an input offset current, IIO

24.

What is the level of the roll-off in most op-amps? Your Answer: –6 dB / decade Correct Answer: –20 dB / decade or –6 dB / octave

25.

Which of the following is (are) the result of gain reduction by a feedback? Your Answer: The amplifier voltage gain is a more stable and precise value. Correct Answer: All of the above

26.

What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp? Your Answer: 200,000 Correct Answer: 1

27.

What is the cutoff frequency of an op-amp if the unity-gain frequency is 1.5 MHz and the open-loop gain is 100,000? Your Answer: 5 Hz Correct Answer: 15 Hz

28.

What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms? Your Answer: 5 V/ms

29.

For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms? Your Answer: 150 Correct Answer: 250

30.

Calculate the output impedance of an inverting op-amp using the 741 op-amp (ro = 75 = 200 V/mV) if R1 = 100 and Rf = 1 k .

, AO L

Your Answer: 0.011 Correct Answer: 0.00375

31.

What is the difference output voltage of any signals applied to the input terminals? Your Answer: The differential gain times the difference input voltage. Correct Answer: The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.

32.

What is the difference voltage if the inputs are an ideal opposite signal? Your Answer: The differential gain times twice the input signal.

33.

What is the difference voltage if the inputs are an ideal in-phase signal? Your Answer: The differential gain times twice the input signal. Correct Answer: The common-mode gain times the input signal.

34.

At what input voltage level does the output voltage level become numerically equal to the value of the differential gain of the amplifier? Your Answer: Vi1 = –Vi2 = 0.25 V Correct Answer: V i1 = –V i2 = 0.50 V

35.

At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier? Your Answer: Vi1 = –Vi2 = 0.25 V Correct Answer: Vi1 = –Vi2 2 = 0.50 V

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