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OP AMP MCQ Questions and Answers PDF [Top 50]: We are going to cover the questions with answers on the same topic.
OP-AMP Circuit Questions and Answers PDF
What is the typical open-loop voltage gain of an ideal operational amplifier?
a. 1
b. 10
c. ∞ (infinity)
d. 0
Answer: c. ∞ (infinity)
In an inverting amplifier configuration, the input signal is applied to the:
a. Non-inverting terminal
b. Inverting terminal
c. Output terminal
d. Ground terminal
Answer: b. Inverting terminal
The input impedance of an ideal OP-AMP is:
a. High
b. Low
c. Equal to 1
d. Equal to 0
Answer: a. High
Which of the following configurations provides a voltage gain greater than 1?
a. Inverting amplifier
b. Non-inverting amplifier
c. Voltage follower
d. Integrator
Answer: b. Non-inverting amplifier
What is the purpose of the offset null terminals in an OP-AMP?
a. To provide a fixed offset voltage
b. To nullify the effects of input offset voltage
c. To set the value of input offset voltage
d. To disconnect the input signal
Answer: b. To nullify the effects of input offset voltage
A differential amplifier is used for:
a. Voltage amplification
b. Current amplification
c. Common-mode rejection
d. Power amplification
Answer: c. Common-mode rejection
The gain bandwidth product of an OP-AMP is constant for:
a. Ideal OP-AMPs only
b. Non-inverting amplifiers only
c. Inverting amplifiers only
d. All configurations
Answer: d. All configurations
What is the output voltage of an integrator circuit when a constant input voltage is applied for a long time?
a. Constant value
b. Increasing linearly
c. Decreasing linearly
d. Oscillating
Answer: c. Decreasing linearly
Which of the following is a disadvantage of using an ideal OP-AMP in practical applications?
a. High input impedance
b. Low output impedance
c. Infinite voltage gain
d. Lack of practicality due to unrealistic characteristics
Answer: d. Lack of practicality due to unrealistic characteristics
The summing amplifier configuration is also known as:
a. Integrator
b. Differentiator
c. Inverting amplifier
d. Summing junction
Answer: d. Summing junction
What is the function of a comparator circuit using an OP-AMP?
a. Voltage amplification
b. Signal integration
c. Comparison of two input voltages
d. Current amplification
Answer: c. Comparison of two input voltages
Which feedback configuration provides a phase shift of 180 degrees between the input and output signals?
a. Positive feedback
b. Negative feedback
c. Voltage feedback
d. Current feedback
Answer: a. Positive feedback
The input bias current in an operational amplifier is typically in the range of:
a. Microamperes
b. Milliamperes
c. Nanamperes
d. Picofarads
Answer: a. Microamperes
What does the term “slew rate” refer to in the context of an OP-AMP?
a. Maximum output voltage
b. Maximum input voltage
c. Rate of change of output voltage with respect to time
d. Rate of change of input voltage with respect to time
Answer: c. Rate of change of output voltage with respect to time
The purpose of a differentiator circuit is to:
a. Integrate the input signal
b. Amplify the input signal
c. Differentiate the input signal
d. Generate a square wave
Answer: c. Differentiate the input signal
In an active filter circuit using an OP-AMP, what is the main advantage compared to a passive filter?
a. Lower cost
b. Higher bandwidth
c. Simplicity of design
d. Reduced power consumption
Answer: b. Higher bandwidth
What happens to the output voltage of an OP-AMP when it is saturated?
a. It becomes zero
b. It remains constant at a maximum or minimum value
c. It oscillates between maximum and minimum values
d. It follows the input signal
Answer: b. It remains constant at a maximum or minimum value
The term “CMRR” in OP-AMP specifications stands for:
a. Common Mode Rejection Ratio
b. Current Mode Reversal Rate
c. Capacitance Matching Resonance
d. Current Modulation Resistance
Answer: a. Common Mode Rejection Ratio
What is the primary purpose of a voltage follower (buffer) configuration using an OP-AMP?
a. Voltage amplification
b. Current amplification
c. Impedance matching
d. Voltage isolation
Answer: c. Impedance matching
The term “rail-to-rail” in OP-AMP specifications refers to:
a. Maximum input voltage range
b. Maximum output voltage range
c. Minimum input voltage range
d. Minimum output voltage rang
Answer: b. Maximum output voltage range
What does the term “virtual short circuit” imply in the context of OP-AMPs?
a. A short circuit in the virtual world
b. The inverting and non-inverting inputs are virtually connected
c. A short circuit causing virtual reality effects
d. A short circuit in the physical world
Answer: b. The inverting and non-inverting inputs are virtually connected
The term “input offset voltage” in an OP-AMP refers to:
a. The difference between the inverting and non-inverting input voltages
b. A constant voltage applied to both inputs to nullify offset
c. The voltage at the output when the input is zero
d. The difference between the actual and ideal input voltages
Answer: d. The difference between the actual and ideal input voltages
In a voltage regulator circuit using an OP-AMP, what role does the feedback loop play?
a. Provides voltage amplification
b. Stabilizes the output voltage
c. Acts as an input signal source
d. Causes positive feedback
Answer: b. Stabilizes the output voltage
What is the primary application of a voltage comparator circuit using an OP-AMP?
a. Voltage amplification
b. Signal integration
c. Signal comparison for digital applications
d. Frequency modulation
Answer: c. Signal comparison for digital applications
The purpose of a hysteresis resistor in a comparator circuit is to:
a. Provide positive feedback
b. Stabilize the output voltage
c. Introduce a delay in the output
d. Reduce noise in the input signal
Answer: a. Provide positive feedbac
What effect does negative feedback have on the bandwidth of an OP-AMP?
a. Increases bandwidth
b. Decreases bandwidth
c. Has no effect on bandwidth
d. Causes oscillation in bandwidth
Answer: a. Increases bandwidth
The term “sinking” and “sourcing” refer to:
a. Types of OP-AMP configurations
b. Current flow into or out of an OP-AMP
c. Output impedance of an OP-AMP
d. Voltage gain of an OP-AMP
Answer: b. Current flow into or out of an OP-AMP
What is the primary purpose of a differentiator circuit in signal processing?
a. Amplify low-frequency signals
b. Generate square wave signals
c. Eliminate high-frequency noise
d. Differentiate between positive and negative signals
Answer: b. Generate square wave signals
In an OP-AMP, the term “slew rate” is most closely related to:
a. Maximum input voltage
b. Maximum output voltage
c. Maximum rate of change of the output voltage
d. Minimum rate of change of the input voltage
Answer: c. Maximum rate of change of the output voltage
What happens to the output voltage of an inverting amplifier if the input voltage is a sinusoidal AC signal?
a. In-phase with the input
b. 90 degrees out of phase with the input
c. 180 degrees out of phase with the input
d. Random phase with the input
Answer: c. 180 degrees out of phase with the input
What is the primary purpose of a Schmitt trigger circuit using an OP-AMP?
a. Signal integration
b. Signal differentiation
c. Signal amplification
d. Signal regeneration
Answer: d. Signal regeneration
The input impedance of an ideal OP-AMP is characterized by:
a. High input impedance and low output impedance
b. Low input impedance and high output impedance
c. High input impedance and high output impedance
d. Low input impedance and low output impedance
Answer: c. High input impedance and high output impedance
In an integrator circuit, the output voltage is proportional to the:
a. Derivative of the input voltage
b. Integral of the input voltage
c. Square of the input voltage
d. Reciprocal of the input voltage
Answer: b. Integral of the input voltage
What is the primary function of a voltage-to-current converter circuit using an OP-AMP?
a. Voltage amplification
b. Current amplification
c. Signal differentiation
d. Signal regeneration
Answer: b. Current amplification
The purpose of a buffer amplifier in an electronic circuit is to:
a. Increase the input impedance
b. Decrease the output impedance
c. Isolate the input from the output
d. Provide voltage amplification
Answer: c. Isolate the input from the output
Which type of feedback is commonly used in operational amplifier circuits to stabilize the gain and reduce distortion?
a. Positive feedback
b. Negative feedback
c. Voltage feedback
d. Current feedback
Answer: b. Negative feedback
The term “common-mode voltage” in OP-AMPs refers to:
a. The average of the inverting and non-inverting input voltages
b. The voltage at the output when both inputs are equal
c. The difference between the inverting and non-inverting input voltages
d. The voltage common to both input terminals
Answer: d. The voltage common to both input terminals
What is the primary disadvantage of using an ideal OP-AMP in a comparator circuit?
a. High-speed operation
b. Limited voltage range
c. Lack of hysteresis
d. Insufficient gain
Answer: c. Lack of hysteresis
In an OP-AMP, what is the purpose of a feedback resistor in a non-inverting amplifier configuration?
a. To set the input voltage
b. To control the output voltage
c. To provide positive feedback
d. To set the gain of the amplifier
Answer: d. To set the gain of the amplifier
The term “unity gain” in an OP-AMP configuration refers to a gain of:
a. 0
b. 1
c. ∞ (infinity)
d. -1
Answer: b. 1
What is the purpose of a peak detector circuit using an OP-AMP?
a. Measure the peak power of a signal
b. Capture and hold the peak value of a signal
c. Amplify the peak value of a signal
d. Eliminate the peaks in a signal
Answer: b. Capture and hold the peak value of a signal
In an inverting amplifier circuit, the phase relationship between the input and output signals is:
a. 0 degrees
b. 90 degrees
c. 180 degrees
d. 360 degrees
Answer: c. 180 degrees
The input offset voltage of an OP-AMP can be minimized by:
a. Increasing the input impedance
b. Decreasing the input impedance
c. Using a higher supply voltage
d. Adding an offset voltage externally
Answer: d. Adding an offset voltage externally
What is the primary purpose of a voltage regulator circuit using an OP-AMP?
a. Signal amplification
b. Stabilizing the output voltage
c. Signal differentiation
d. Increasing the input impedance
Answer: b. Stabilizing the output voltage
In a non-inverting amplifier circuit, the voltage gain is determined by the ratio of:
a. Feedback resistor to input resistor
b. Input resistor to feedback resistor
c. Feedback resistor to the sum of input resistor and feedback resistor
d. Input resistor to the sum of input resistor and feedback resistor
Answer: c. Feedback resistor to the sum of input resistor and feedback resistor
What is the primary application of an active bandpass filter using an OP-AMP?
a. Filtering out high-frequency signals
b. Filtering out low-frequency signals
c. Amplifying a specific range of frequencies
d. Inverting the input signal
Answer: c. Amplifying a specific range of frequencies
The term “offset voltage” in an OP-AMP refers to:
a. The difference between the inverting and non-inverting input voltages
b. The voltage at the output when the input is zero
c. The difference between the actual and ideal input voltages
d. The difference between the positive and negative supply voltages
Answer: c. The difference between the actual and ideal input voltages
In an OP-AMP, what is the purpose of a compensation capacitor in an integrator circuit?
a. To reduce input impedance
b. To stabilize the output voltage
c. To prevent oscillations
d. To increase the gain
Answer: c. To prevent oscillations
What is the effect of increasing the value of the input resistor in an inverting amplifier circuit?
a. Increases the gain
b. Decreases the gain
c. Has no effect on the gain
d. Increases the input impedance
Answer: a. Increases the gain
The common-mode rejection ratio (CMRR) of an OP-AMP is a measure of its ability to reject:
a. Common-mode signals
b. Differential-mode signals
c. High-frequency signals
d. Low-frequency signals
Answer: a. Common-mode signals
What is the primary advantage of using a rail-to-rail OP-AMP?
a. Higher input impedance
b. Higher output impedance
c. Extended input voltage range
d. Reduced input offset voltage
Answer: c. Extended input voltage range
A differentiator circuit is often used for:
a. Signal amplification
b. Signal integration
c. High-pass filtering
d. Low-pass filtering
Answer: c. High-pass filtering
The input offset voltage can be defined as the:
a. Voltage at the non-inverting input terminal
b. Difference between the inverting and non-inverting input voltages
c. Voltage at the inverting input terminal
d. Voltage at the output terminal
Answer: b. Difference between the inverting and non-inverting input voltages
What is the purpose of a voltage follower (unity gain buffer) in an OP-AMP circuit?
a. Voltage amplification
b. Current amplification
c. Signal inversion
d. Impedance matching
Answer: d. Impedance matching
The term “saturated” in the context of an OP-AMP refers to:
a. Maximum output voltage swing
b. Minimum output voltage swing
c. Maximum input voltage
d. Minimum input voltage
Answer: a. Maximum output voltage swing
What is the primary function of an integrator circuit using an OP-AMP?
a. Amplify the input signal
b. Differentiate the input signal
c. Generate square wave signals
d. Produce the integral of the input signal
Answer: d. Produce the integral of the input signal
The term “closed-loop gain” in an OP-AMP circuit refers to the gain when:
a. No feedback is applied
b. Negative feedback is applied
c. Positive feedback is applied
d. Common-mode signals are present
Answer: b. Negative feedback is applied
What happens to the bandwidth of an OP-AMP when negative feedback is applied?
a. Increases
b. Decreases
c. Remains constant
d. Becomes zero
Answer: a. Increases
The main purpose of a voltage comparator is to:
a. Amplify the input voltage
b. Compare two input voltages and provide a high or low output
c. Provide voltage regulation
d. Integrate the input signal
Answer: b. Compare two input voltages and provide a high or low output
In a non-inverting amplifier configuration, the input and output signals are:
a. In-phase
b. 90 degrees out of phase
c. 180 degrees out of phase
d. Randomly phased
Answer: a. In-phase
What is the primary advantage of a voltage follower (unity gain buffer) configuration in an OP-AMP circuit?
a. Voltage amplification
b. Current amplification
c. High input impedance
d. Low output impedance
Answer: d. Low output impedance
The purpose of a low-pass filter circuit using an OP-AMP is to:
a. Allow low-frequency signals to pass through
b. Block low-frequency signals
c. Allow high-frequency signals to pass through
d. Block high-frequency signals
Answer: a. Allow low-frequency signals to pass through
The voltage at the inverting input terminal of an OP-AMP with negative feedback is typically:
a. Equal to the non-inverting input voltage
b. Higher than the non-inverting input voltage
c. Lower than the non-inverting input voltage
d. Unrelated to the non-inverting input voltage
Answer: a. Equal to the non-inverting input voltage
What is the primary purpose of a summing amplifier circuit using an OP-AMP?
a. Signal differentiation
b. Signal integration
c. Summing multiple input voltages
d. Voltage regulation
Answer: c. Summing multiple input voltages
The primary function of a differentiator circuit is to respond to changes in the:
a. Amplitude of the input signal
b. Frequency of the input signal
c. Phase of the input signal
d. Slope of the input signal
Answer: d. Slope of the input signal
What does the term “input offset voltage” represent in an OP-AMP?
a. The voltage at the inverting input terminal
b. The difference between the inverting and non-inverting input voltages
c. The voltage at the non-inverting input terminal
d. The difference between the actual and ideal input voltages
Answer: d. The difference between the actual and ideal input voltages
The primary function of a voltage-to-frequency converter circuit using an OP-AMP is to:
a. Amplify voltage signals
b. Convert voltage signals to frequency signals
c. Stabilize output voltage
d. Differentiate input signals
Answer: b. Convert voltage signals to frequency signals
The purpose of a feedback resistor in an inverting amplifier circuit is to:
a. Set the input voltage
b. Set the output voltage
c. Control the gain of the amplifier
d. Provide positive feedback
Answer: c. Control the gain of the amplifier
In an OP-AMP, what is the effect of increasing the closed-loop gain in a non-inverting amplifier configuration?
a. Increases input impedance
b. Decreases input impedance
c. Increases output impedance
d. Decreases output impedance
Answer: a. Increases input impedance
What is the primary purpose of a voltage-to-current converter using an OP-AMP?
a. Voltage amplification
b. Current amplification
c. Signal inversion
d. Impedance matching
Answer: b. Current amplification
In an OP-AMP circuit, what is the significance of the term “common mode”?
a. The mode of operation with common supply voltages
b. The mode of operation with common feedback
c. The mode of operation with common input signals
d. The mode of operation with common output voltages
Answer: c. The mode of operation with common input signals
The output impedance of an ideal OP-AMP is typically:
a. Very high
b. Very low
c. Equal to the input impedance
d. Zero
Answer: b. Very low
What is the primary purpose of an instrumentation amplifier using multiple OP-AMPs?
a. High voltage gain
b. High common-mode rejection ratio
c. Low input impedance
d. Low noise performance
Answer: b. High common-mode rejection ratio
What does the term “saturation” refer to in the context of an OP-AMP?
a. The input voltage exceeding the maximum allowed value
b. The output voltage reaching its maximum or minimum limit
c. The input and output voltages being equal
d. The amplifier operating at its peak efficiency
Answer: b. The output voltage reaching its maximum or minimum limit
The purpose of a voltage-to-frequency converter using an OP-AMP is to:
a. Convert voltage signals to frequency signals
b. Convert frequency signals to voltage signals
c. Stabilize output voltage
d. Provide voltage amplification
Answer: a. Convert voltage signals to frequency signals
The term “CMOS” in the context of OP-AMPs stands for:
a. Common Mode Output Sensor
b. Complementary Metal-Oxide-Semiconductor
c. Current Mode Operational System
d. Capacitive Multi-Output Sensor
Answer: b. Complementary Metal-Oxide-Semiconductor
What is the main advantage of using a differential amplifier configuration in an OP-AMP circuit?
a. High common-mode rejection ratio
b. Low voltage gain
c. Low input impedance
d. High output impedance
Answer: a. High common-mode rejection ratio
The term “synchronous detection” in an OP-AMP context is associated with:
a. Detecting signals with a specific frequency
b. Detecting signals in phase with a reference signal
c. Detecting signals with random phase
d. Detecting signals with varying amplitudes
Answer: b. Detecting signals in phase with a reference signal
In an OP-AMP circuit, what is the purpose of a bypass capacitor?
a. To block DC signals
b. To block AC signals
c. To stabilize the output voltage
d. To increase the gain
Answer: a. To block DC signals
What is the function of a phase-locked loop (PLL) circuit using an OP-AMP?
a. Voltage amplification
b. Frequency synthesis and synchronization
c. Signal differentiation
d. Phase inversion
Answer: b. Frequency synthesis and synchronization
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