14140665
Descripción
Test por Katrina Himes, actualizado hace más de 1 año
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Creado por Katrina Himes
hace alrededor de 6 años
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Pregunta 1
Pregunta
The op amp can amplify
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AC signals only
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DC signals only
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Both AC and DC signals
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Neither AC nor DC signals
Pregunta 2
Pregunta
The tail current of a diff amp is
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Half of either collector current
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Equal to either collector current
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Two times either collector current
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Equal to the difference in base currents
Pregunta 3
Pregunta
The input offset current equals the
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Difference between the two base currents
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Average of the two base currents
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Collector current divided by current gain
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Difference between the two base-emitter voltages
Pregunta 4
Pregunta
The tail current equals the
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Difference between the two emitter currents
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Sum of the two emitter currents
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Collector current divided by current gain
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Collector voltage divided by collector resistance
Pregunta 5
Pregunta
The voltage gain of a diff amp with an unloaded differential output is equal to Rc divided by
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r'e
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r'e/2
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2 r'e
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Re
Pregunta 6
Pregunta
The input impedance of a diff amp equals r'e times
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0
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Rc
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Re
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2 ß
Pregunta 7
Pregunta
A dc signal has a frequency of
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0 Hz
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60 Hz
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0 to more than 1 MHz
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1 MHz
Pregunta 8
Pregunta
When the two input terminals of a diff amp are grounded,
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The base currents are equal
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The collector currents are equal
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An output error voltage usually exists
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The ac output voltage is zero
Pregunta 9
Pregunta
A common-mode signal is applied to
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The noninverting input
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The inverting input
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Both inputs
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The top of the tail resistor
Pregunta 10
Pregunta
The common-mode voltage gain is
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Smaller than the voltage gain
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Equal to the voltage gain
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Greater than the voltage gain
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None of the above
Pregunta 11
Pregunta
The input stage of an op amp is usually a
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Diff amp
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Class B push-pull amplifier
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CE amplifier
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Swamped amplifier
Pregunta 12
Pregunta
When the two bases are grounded in a diff amp the voltage across each emitter diode is
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Zero
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0.7 V
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The same
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High
Pregunta 13
Pregunta
The input offset current is usually
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Less than the input bias current
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Equal to zero
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Less than the input offset voltage
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Unimportant when a base resistor is used
Pregunta 14
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 15
Pregunta
At the unity gain frequency, the open-loop voltage gain is
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1
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Av (mid)
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Zero
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Very large
Pregunta 16
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 17
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 18
Pregunta
The 741 V 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 19
Pregunta
The initial slope of a sine wave increases when
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Frequency increases
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Peak value increases
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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 occurs
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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
Above the cutoff frequency, the voltage gain of a 741 C 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 23
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 24
Pregunta
When the 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 25
Pregunta
A 741 C has
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A voltage gain of 100,000
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An input impedance of 2 MΩ
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An output impedance of 75 Ω
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All of the above
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