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Chapter 18 Operational Amplifiers

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Quiz on Chapter 18 Operational Amplifiers, created by Ron Macatangay on 03/06/2018.
Ron Macatangay
Quiz by Ron Macatangay, updated more than 1 year ago
Ron Macatangay
Created by Ron Macatangay almost 6 years ago
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Resource summary

Question 1

Question
What usually controls the open-loop cutoff frequency of an op amp?
Answer
  • Stray-writing capacitance
  • Base-emitter capacitance
  • Collector-base capacitance
  • Compensating capacitance

Question 2

Question
A compensating capacitor prevents
Answer
  • Voltage gain
  • Oscillations
  • Input offset current
  • Power bandwidth

Question 3

Question
At the unity-gain frequency, the open-loop voltage gain is
Answer
  • 1
  • A vid(mid)
  • Zero
  • Very Large

Question 4

Question
The cutoff frequency of an op amp equals the unity-gain frequency divided by
Answer
  • The cutoff frequency
  • Closed-loop voltage gain
  • Unity
  • Common-mode voltage gain

Question 5

Question
If the cutoff frequency is 20 Hz and the midband open-loop voltage gain is 1,000,000 the unity-gain frequency is
Answer
  • 20 Hz
  • 1 MHz
  • 2 MHz
  • 20 MHz

Question 6

Question
If the unity-gain frequency is 5 MHz and the midband open-loop voltage gain is 100,000 the cut0ff frequency is
Answer
  • 50 Hz
  • 1 MHz
  • 1.5 MHz
  • 15 MHz

Question 7

Question
The initial slope of a sine wave is directly proportional to
Answer
  • Slew rate
  • Frequency
  • Voltage gain
  • Capacitance

Question 8

Question
When the initial slope of a sine wave is greater than the slew rate,
Answer
  • Distortion occurs
  • Linear operation occurs
  • Voltage gain is maximum
  • The op amp works best

Question 9

Question
The power bandwidth increases when
Answer
  • Frequency decreases
  • Peak value decreases
  • Initial slope decreases
  • Voltage gain increases

Question 10

Question
A 741C contains
Answer
  • Discrete resistors
  • Inductors
  • Active-load resistors
  • A large coupling capacitor

Question 11

Question
A 741C cannot work without
Answer
  • Discrete resistors
  • Passive loading
  • DC return paths on the two bases
  • A small coupling capacitor

Question 12

Question
The input impedance of a BIFET op amp is
Answer
  • Low
  • Medium
  • High
  • Extremely high

Question 13

Question
An LF157A is a
Answer
  • Diff amp
  • Source follower
  • Bipolar op amp
  • BIFET op amp

Question 14

Question
If the two supply voltages are -+12 V the MPP value of an op amp is closest to
Answer
  • 0
  • +12 V
  • -12 V
  • 24 V

Question 15

Question
The open-loop cutoff frequency of a 741C is controlled by
Answer
  • A coupling capacitor
  • The output short circuit current
  • The power bandwidth
  • A compensating capacitor

Question 16

Question
The 741C has a unity-gain frequency of
Answer
  • 10 Hz
  • 20 kHz
  • 1 MHz
  • 15 MHz

Question 17

Question
The unity-gain frequency equals the product of closed-loop voltage gain and the
Answer
  • Compensating capacitance
  • Tail current
  • Closed-loop cutoff frequency
  • Load resistance

Question 18

Question
If f unity is 10 MHz and midband open-loop voltage gain is 200,000 then the open-loop cutoff frequency of the op amp is
Answer
  • 10 Hz
  • 20 Hz
  • 50 Hz
  • 100 Hz

Question 19

Question
The initial slope of a sine wave increases when
Answer
  • Frequency decreases
  • Peak value increses
  • Cc increases
  • Slew rate decreases

Question 20

Question
If the frequency of the input signal is greater than the power bandwidth
Answer
  • Slew-rate distortion occurs
  • A normal output signal osscurs
  • Output offset voltage increases
  • Distortion may occur

Question 21

Question
An op amp has an open base resistor. The output voltage will be
Answer
  • Zero
  • Slightly different from zero
  • Maximum positive or negative
  • An amplified sine wave

Question 22

Question
An op amp has a voltage gain of 200,000. If the output voltage is 1 V, the input voltage is
Answer
  • 2 uV
  • 5 uV
  • 10 mV
  • 1 V

Question 23

Question
A 741C has supply voltages of -+15 V. If the output voltage is 1 V, the input voltage is
Answer
  • 0
  • + 15 V
  • 27 V
  • 30 V

Question 24

Question
Above the cutoff frequency, the voltage gain of a 741C decreases approximately
Answer
  • 10 dB per decade
  • 20 dB per octave
  • 10 dB per octave
  • 20 dB per decade

Question 25

Question
The voltage gain of an op amp is unity at the
Answer
  • Cutoff frequency
  • Unity-gain frequency
  • Generator frequency
  • Power bandwidth

Question 26

Question
When slew-rate distortion of a sine wave occurs, the output
Answer
  • Is larger
  • Appears triangular
  • Is normal
  • Has no offset

Question 27

Question
A 741C has
Answer
  • A voltage gain of 100,000
  • An input impedance of 2 M ohm
  • An output impedance of 75 ohm
  • All of the above

Question 28

Question
The closed-loop voltage gain of an inverting amplifier equals
Answer
  • The ratio of the input resistance to the feedback resistance
  • The open-loop voltage gain
  • The feedback resistance divided by the input resistance
  • The input resistance

Question 29

Question
The noninverting amplifier has a
Answer
  • Large closed-loop voltage gain
  • Small open-loop voltage gain
  • Large closed-loop input impedance
  • Large closed-loop output impedance

Question 30

Question
The voltage follower has a
Answer
  • Closed-loop voltage gain of unity
  • Small open-loop voltage gain
  • Closed-loop bandwidth of zero
  • Large closed-loop output impedance

Question 31

Question
A summing amplifier can have
Answer
  • No more than two input signals
  • Two or more input signals
  • A closed-loop input impedance of infinity
  • A small open-loop voltage gain
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