Ron Macatangay
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Quiz on Chapter 18 Operational Amplifiers, created by Ron Macatangay on 03/06/2018.

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Ron Macatangay
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Chapter 18 Operational Amplifiers

Question 1 of 31

1

What usually controls the open-loop cutoff frequency of an op amp?

Select one of the following:

  • Stray-writing capacitance

  • Base-emitter capacitance

  • Collector-base capacitance

  • Compensating capacitance

Explanation

Question 2 of 31

1

A compensating capacitor prevents

Select one of the following:

  • Voltage gain

  • Oscillations

  • Input offset current

  • Power bandwidth

Explanation

Question 3 of 31

1

At the unity-gain frequency, the open-loop voltage gain is

Select one of the following:

  • 1

  • A vid(mid)

  • Zero

  • Very Large

Explanation

Question 4 of 31

1

The cutoff frequency of an op amp equals the unity-gain frequency divided by

Select one of the following:

  • The cutoff frequency

  • Closed-loop voltage gain

  • Unity

  • Common-mode voltage gain

Explanation

Question 5 of 31

1

If the cutoff frequency is 20 Hz and the midband open-loop voltage gain is 1,000,000 the unity-gain frequency is

Select one of the following:

  • 20 Hz

  • 1 MHz

  • 2 MHz

  • 20 MHz

Explanation

Question 6 of 31

1

If the unity-gain frequency is 5 MHz and the midband open-loop voltage gain is 100,000 the cut0ff frequency is

Select one of the following:

  • 50 Hz

  • 1 MHz

  • 1.5 MHz

  • 15 MHz

Explanation

Question 7 of 31

1

The initial slope of a sine wave is directly proportional to

Select one of the following:

  • Slew rate

  • Frequency

  • Voltage gain

  • Capacitance

Explanation

Question 8 of 31

1

When the initial slope of a sine wave is greater than the slew rate,

Select one of the following:

  • Distortion occurs

  • Linear operation occurs

  • Voltage gain is maximum

  • The op amp works best

Explanation

Question 9 of 31

1

The power bandwidth increases when

Select one of the following:

  • Frequency decreases

  • Peak value decreases

  • Initial slope decreases

  • Voltage gain increases

Explanation

Question 10 of 31

1

A 741C contains

Select one of the following:

  • Discrete resistors

  • Inductors

  • Active-load resistors

  • A large coupling capacitor

Explanation

Question 11 of 31

1

A 741C cannot work without

Select one of the following:

  • Discrete resistors

  • Passive loading

  • DC return paths on the two bases

  • A small coupling capacitor

Explanation

Question 12 of 31

1

The input impedance of a BIFET op amp is

Select one of the following:

  • Low

  • Medium

  • High

  • Extremely high

Explanation

Question 13 of 31

1

An LF157A is a

Select one of the following:

  • Diff amp

  • Source follower

  • Bipolar op amp

  • BIFET op amp

Explanation

Question 14 of 31

1

If the two supply voltages are -+12 V the MPP value of an op amp is closest to

Select one of the following:

  • 0

  • +12 V

  • -12 V

  • 24 V

Explanation

Question 15 of 31

1

The open-loop cutoff frequency of a 741C is controlled by

Select one of the following:

  • A coupling capacitor

  • The output short circuit current

  • The power bandwidth

  • A compensating capacitor

Explanation

Question 16 of 31

1

The 741C has a unity-gain frequency of

Select one of the following:

  • 10 Hz

  • 20 kHz

  • 1 MHz

  • 15 MHz

Explanation

Question 17 of 31

1

The unity-gain frequency equals the product of closed-loop voltage gain and the

Select one of the following:

  • Compensating capacitance

  • Tail current

  • Closed-loop cutoff frequency

  • Load resistance

Explanation

Question 18 of 31

1

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

Select one of the following:

  • 10 Hz

  • 20 Hz

  • 50 Hz

  • 100 Hz

Explanation

Question 19 of 31

1

The initial slope of a sine wave increases when

Select one of the following:

  • Frequency decreases

  • Peak value increses

  • Cc increases

  • Slew rate decreases

Explanation

Question 20 of 31

1

If the frequency of the input signal is greater than the power bandwidth

Select one of the following:

  • Slew-rate distortion occurs

  • A normal output signal osscurs

  • Output offset voltage increases

  • Distortion may occur

Explanation

Question 21 of 31

1

An op amp has an open base resistor. The output voltage will be

Select one of the following:

  • Zero

  • Slightly different from zero

  • Maximum positive or negative

  • An amplified sine wave

Explanation

Question 22 of 31

1

An op amp has a voltage gain of 200,000. If the output voltage is 1 V, the input voltage is

Select one of the following:

  • 2 uV

  • 5 uV

  • 10 mV

  • 1 V

Explanation

Question 23 of 31

1

A 741C has supply voltages of -+15 V. If the output voltage is 1 V, the input voltage is

Select one of the following:

  • 0

  • + 15 V

  • 27 V

  • 30 V

Explanation

Question 24 of 31

1

Above the cutoff frequency, the voltage gain of a 741C decreases approximately

Select one of the following:

  • 10 dB per decade

  • 20 dB per octave

  • 10 dB per octave

  • 20 dB per decade

Explanation

Question 25 of 31

1

The voltage gain of an op amp is unity at the

Select one of the following:

  • Cutoff frequency

  • Unity-gain frequency

  • Generator frequency

  • Power bandwidth

Explanation

Question 26 of 31

1

When slew-rate distortion of a sine wave occurs, the output

Select one of the following:

  • Is larger

  • Appears triangular

  • Is normal

  • Has no offset

Explanation

Question 27 of 31

1

A 741C has

Select one of the following:

  • A voltage gain of 100,000

  • An input impedance of 2 M ohm

  • An output impedance of 75 ohm

  • All of the above

Explanation

Question 28 of 31

1

The closed-loop voltage gain of an inverting amplifier equals

Select one of the following:

  • 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

Explanation

Question 29 of 31

1

The noninverting amplifier has a

Select one of the following:

  • Large closed-loop voltage gain

  • Small open-loop voltage gain

  • Large closed-loop input impedance

  • Large closed-loop output impedance

Explanation

Question 30 of 31

1

The voltage follower has a

Select one of the following:

  • Closed-loop voltage gain of unity

  • Small open-loop voltage gain

  • Closed-loop bandwidth of zero

  • Large closed-loop output impedance

Explanation

Question 31 of 31

1

A summing amplifier can have

Select one of the following:

  • No more than two input signals

  • Two or more input signals

  • A closed-loop input impedance of infinity

  • A small open-loop voltage gain

Explanation

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