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