14042230
Descrição
Quiz por Ron Macatangay, atualizado more than 1 year ago
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Criado por Ron Macatangay
quase 6 anos atrás
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Questão 1
Questão
What usually controls the open-loop cutoff frequency of an op amp?
Responda
-
Stray-writing capacitance
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Base-emitter capacitance
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Collector-base capacitance
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Compensating capacitance
Questão 2
Questão
A compensating capacitor prevents
Responda
-
Voltage gain
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Oscillations
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Input offset current
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Power bandwidth
Questão 3
Questão
At the unity-gain frequency, the open-loop voltage gain is
Responda
-
1
-
A vid(mid)
-
Zero
-
Very Large
Questão 4
Questão
The cutoff frequency of an op amp equals the unity-gain frequency divided by
Responda
-
The cutoff frequency
-
Closed-loop voltage gain
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Unity
-
Common-mode voltage gain
Questão 5
Questão
If the cutoff frequency is 20 Hz and the midband open-loop voltage gain is 1,000,000 the unity-gain frequency is
Responda
-
20 Hz
-
1 MHz
-
2 MHz
-
20 MHz
Questão 6
Questão
If the unity-gain frequency is 5 MHz and the midband open-loop voltage gain is 100,000 the cut0ff frequency is
Responda
-
50 Hz
-
1 MHz
-
1.5 MHz
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15 MHz
Questão 7
Questão
The initial slope of a sine wave is directly proportional to
Responda
-
Slew rate
-
Frequency
-
Voltage gain
-
Capacitance
Questão 8
Questão
When the initial slope of a sine wave is greater than the slew rate,
Responda
-
Distortion occurs
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Linear operation occurs
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Voltage gain is maximum
-
The op amp works best
Questão 9
Questão
The power bandwidth increases when
Responda
-
Frequency decreases
-
Peak value decreases
-
Initial slope decreases
-
Voltage gain increases
Questão 10
Questão
A 741C contains
Responda
-
Discrete resistors
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Inductors
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Active-load resistors
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A large coupling capacitor
Questão 11
Questão
A 741C cannot work without
Responda
-
Discrete resistors
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Passive loading
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DC return paths on the two bases
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A small coupling capacitor
Questão 12
Questão
The input impedance of a BIFET op amp is
Responda
-
Low
-
Medium
-
High
-
Extremely high
Questão 13
Questão
An LF157A is a
Responda
-
Diff amp
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Source follower
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Bipolar op amp
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BIFET op amp
Questão 14
Questão
If the two supply voltages are -+12 V the MPP value of an op amp is closest to
Responda
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0
-
+12 V
-
-12 V
-
24 V
Questão 15
Questão
The open-loop cutoff frequency of a 741C is controlled by
Responda
-
A coupling capacitor
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The output short circuit current
-
The power bandwidth
-
A compensating capacitor
Questão 16
Questão
The 741C has a unity-gain frequency of
Responda
-
10 Hz
-
20 kHz
-
1 MHz
-
15 MHz
Questão 17
Questão
The unity-gain frequency equals the product of closed-loop voltage gain and the
Responda
-
Compensating capacitance
-
Tail current
-
Closed-loop cutoff frequency
-
Load resistance
Questão 18
Questão
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
Responda
-
10 Hz
-
20 Hz
-
50 Hz
-
100 Hz
Questão 19
Questão
The initial slope of a sine wave increases when
Responda
-
Frequency decreases
-
Peak value increses
-
Cc increases
-
Slew rate decreases
Questão 20
Questão
If the frequency of the input signal is greater than the power bandwidth
Responda
-
Slew-rate distortion occurs
-
A normal output signal osscurs
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Output offset voltage increases
-
Distortion may occur
Questão 21
Questão
An op amp has an open base resistor. The output voltage will be
Responda
-
Zero
-
Slightly different from zero
-
Maximum positive or negative
-
An amplified sine wave
Questão 22
Questão
An op amp has a voltage gain of 200,000. If the output voltage is 1 V, the input voltage is
Responda
-
2 uV
-
5 uV
-
10 mV
-
1 V
Questão 23
Questão
A 741C has supply voltages of -+15 V. If the output voltage is 1 V, the input voltage is
Responda
-
0
-
+ 15 V
-
27 V
-
30 V
Questão 24
Questão
Above the cutoff frequency, the voltage gain of a 741C decreases approximately
Responda
-
10 dB per decade
-
20 dB per octave
-
10 dB per octave
-
20 dB per decade
Questão 25
Questão
The voltage gain of an op amp is unity at the
Responda
-
Cutoff frequency
-
Unity-gain frequency
-
Generator frequency
-
Power bandwidth
Questão 26
Questão
When slew-rate distortion of a sine wave occurs, the output
Responda
-
Is larger
-
Appears triangular
-
Is normal
-
Has no offset
Questão 27
Questão
A 741C has
Responda
-
A voltage gain of 100,000
-
An input impedance of 2 M ohm
-
An output impedance of 75 ohm
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All of the above
Questão 28
Questão
The closed-loop voltage gain of an inverting amplifier equals
Responda
-
The ratio of the input resistance to the feedback resistance
-
The open-loop voltage gain
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The feedback resistance divided by the input resistance
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The input resistance
Questão 29
Questão
The noninverting amplifier has a
Responda
-
Large closed-loop voltage gain
-
Small open-loop voltage gain
-
Large closed-loop input impedance
-
Large closed-loop output impedance
Questão 30
Questão
The voltage follower has a
Responda
-
Closed-loop voltage gain of unity
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Small open-loop voltage gain
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Closed-loop bandwidth of zero
-
Large closed-loop output impedance
Questão 31
Questão
A summing amplifier can have
Responda
-
No more than two input signals
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Two or more input signals
-
A closed-loop input impedance of infinity
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A small open-loop voltage gain
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