Q. In a comparator circuit, what happens when the non-inverting input voltage exceeds the inverting input voltage?
A.
The output goes low
B.
The output goes high
C.
The output remains unchanged
D.
The output oscillates
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Solution
When the non-inverting input voltage exceeds the inverting input voltage, the output of the comparator goes high.
Correct Answer:
B
— The output goes high
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Q. In a differential amplifier, what is the significance of the resistor values?
A.
They determine the input impedance
B.
They set the common-mode gain
C.
They affect the differential gain
D.
They stabilize the output voltage
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Solution
In a differential amplifier, the resistor values directly affect the differential gain, which is the ratio of the output voltage to the difference between the input voltages.
Correct Answer:
C
— They affect the differential gain
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Q. In a peak detector circuit using an op-amp, what component is crucial for storing the peak voltage?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Diode
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Solution
A capacitor is crucial in a peak detector circuit as it stores the peak voltage for later use.
Correct Answer:
B
— Capacitor
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Q. In a precision rectifier circuit, what is the main advantage over a standard diode rectifier?
A.
Higher efficiency
B.
Lower forward voltage drop
C.
Ability to rectify small signals accurately
D.
Faster switching speed
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Solution
A precision rectifier can accurately rectify small signals that would be lost in a standard diode rectifier due to the diode's forward voltage drop.
Correct Answer:
C
— Ability to rectify small signals accurately
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Q. In a Schmitt trigger circuit, what is the effect of hysteresis?
A.
It increases the gain
B.
It stabilizes the output against noise
C.
It reduces the input impedance
D.
It allows for faster switching
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Solution
Hysteresis in a Schmitt trigger stabilizes the output against noise by providing two different threshold voltages for switching.
Correct Answer:
B
— It stabilizes the output against noise
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Q. In a summing amplifier configuration, what is the role of the feedback resistor?
A.
To set the gain of the amplifier
B.
To provide stability
C.
To determine the input impedance
D.
To filter noise
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Solution
The feedback resistor in a summing amplifier sets the gain of the amplifier for the summed inputs.
Correct Answer:
A
— To set the gain of the amplifier
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Q. What is the effect of negative feedback in op-amp circuits?
A.
Increases gain
B.
Decreases gain and improves stability
C.
Increases distortion
D.
Eliminates noise completely
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Solution
Negative feedback decreases gain and improves stability in op-amp circuits, leading to better performance.
Correct Answer:
B
— Decreases gain and improves stability
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Q. What is the function of a peak detector circuit using an op-amp?
A.
To measure average voltage
B.
To store the peak value of an input signal
C.
To filter out AC components
D.
To amplify low-level signals
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Solution
A peak detector circuit stores the peak value of an input signal, allowing for measurement of maximum signal levels.
Correct Answer:
B
— To store the peak value of an input signal
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Q. What is the function of a Schmitt trigger in op-amp circuits?
A.
To amplify weak signals
B.
To provide hysteresis in signal switching
C.
To filter out high-frequency noise
D.
To integrate input signals
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Solution
A Schmitt trigger provides hysteresis in signal switching, which helps to eliminate noise and provide clean transitions between high and low states.
Correct Answer:
B
— To provide hysteresis in signal switching
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Q. What is the main advantage of using an instrumentation amplifier?
A.
High input impedance and low output impedance
B.
Ability to amplify small differential signals in the presence of noise
C.
Simple design and low cost
D.
Wide bandwidth
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Solution
An instrumentation amplifier is designed to amplify small differential signals while rejecting common-mode noise, making it ideal for sensor applications.
Correct Answer:
B
— Ability to amplify small differential signals in the presence of noise
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Q. What is the main advantage of using an integrator circuit with an op-amp?
A.
It provides a constant output voltage
B.
It can convert a square wave to a triangular wave
C.
It amplifies high-frequency signals
D.
It filters out low-frequency noise
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Solution
An integrator circuit converts a square wave input into a triangular wave output by integrating the input signal over time.
Correct Answer:
B
— It can convert a square wave to a triangular wave
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Q. What is the primary characteristic of a log amplifier using an op-amp?
A.
It produces a linear output for linear input
B.
It outputs a logarithmic function of the input voltage
C.
It filters out high-frequency signals
D.
It provides gain for low-level signals
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Solution
A log amplifier outputs a logarithmic function of the input voltage, which is useful in applications requiring exponential scaling.
Correct Answer:
B
— It outputs a logarithmic function of the input voltage
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Q. What is the primary function of a voltage follower using an op-amp?
A.
To amplify the input voltage
B.
To provide high input impedance and low output impedance
C.
To invert the input signal
D.
To filter high frequencies
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Solution
A voltage follower provides high input impedance and low output impedance, making it ideal for buffering signals.
Correct Answer:
B
— To provide high input impedance and low output impedance
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Q. What is the primary purpose of a comparator circuit using an op-amp?
A.
To amplify AC signals
B.
To compare two voltages and output a digital signal
C.
To filter out noise
D.
To provide feedback in a control system
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Solution
A comparator circuit compares two input voltages and outputs a digital signal indicating which input is higher.
Correct Answer:
B
— To compare two voltages and output a digital signal
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Q. What is the primary purpose of a differential amplifier?
A.
To amplify a single input signal
B.
To amplify the difference between two input signals
C.
To filter noise from a signal
D.
To provide isolation between circuits
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Solution
A differential amplifier amplifies the difference between two input signals, making it useful for applications like instrumentation.
Correct Answer:
B
— To amplify the difference between two input signals
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Q. What is the primary use of an active low-pass filter using an op-amp?
A.
To amplify high-frequency signals
B.
To allow low-frequency signals to pass while attenuating high frequencies
C.
To rectify AC signals
D.
To provide isolation between circuits
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Solution
An active low-pass filter allows low-frequency signals to pass while attenuating high-frequency signals, using an op-amp for gain.
Correct Answer:
B
— To allow low-frequency signals to pass while attenuating high frequencies
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Q. What is the primary use of an op-amp as a peak detector?
A.
To measure average voltage
B.
To store the peak value of an input signal
C.
To amplify low-frequency signals
D.
To filter out noise
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Solution
An op-amp configured as a peak detector is used to store the peak value of an input signal for later retrieval.
Correct Answer:
B
— To store the peak value of an input signal
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Q. What is the purpose of a differential amplifier?
A.
To amplify a single-ended signal
B.
To amplify the difference between two input signals
C.
To rectify AC signals
D.
To provide isolation between circuits
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Solution
A differential amplifier amplifies the difference between two input signals, rejecting any common-mode noise.
Correct Answer:
B
— To amplify the difference between two input signals
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Q. Which configuration of an op-amp can be used to integrate an input signal over time?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Integrator
D.
Differential amplifier
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Solution
An integrator configuration of an op-amp is used to integrate an input signal over time, producing a ramp output.
Correct Answer:
C
— Integrator
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Q. Which configuration of an op-amp is used to create a precision rectifier?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Differential amplifier
D.
Voltage follower
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Solution
An inverting amplifier configuration can be used to create a precision rectifier, allowing for accurate rectification of small signals.
Correct Answer:
A
— Inverting amplifier
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Q. Which configuration of an op-amp is used to perform integration of an input signal?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Differentiator
D.
Integrator
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Solution
An integrator configuration of an op-amp is specifically designed to perform the mathematical operation of integration on the input signal.
Correct Answer:
D
— Integrator
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Q. Which type of op-amp circuit can be used to generate a specific output voltage that is a weighted sum of multiple input voltages?
A.
Differential amplifier
B.
Inverting amplifier
C.
Summing amplifier
D.
Integrator
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Solution
A summing amplifier can generate an output voltage that is a weighted sum of multiple input voltages.
Correct Answer:
C
— Summing amplifier
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Q. Which type of op-amp configuration is used for active filtering?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Active low-pass filter
D.
Voltage follower
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Solution
An active low-pass filter configuration uses an op-amp to allow low-frequency signals to pass while attenuating high-frequency signals.
Correct Answer:
C
— Active low-pass filter
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