Top 20 MCQs about Operational Amplifiers For Electronics Students
A. Infinite
B. Zero
C. One
D. Very high
B. Zero
C. One
D. Very high
Answer: A. Infinite
A. Inverting
B. Non-inverting
C. Differential
D. All of the above
B. Non-inverting
C. Differential
D. All of the above
Answer: D. All of the above
Q 3: In a practical operational amplifier, what is the typical input impedance?
A. Low
B. High
C. Zero
D. Infinite
B. High
C. Zero
D. Infinite
Answer: B. High
Q 4: What is the purpose of a feedback resistor in an op-amp circuit?
A. To stabilize the gain
B. To increase the gain
C. To decrease the gain
D. To provide power
B. To increase the gain
C. To decrease the gain
D. To provide power
Answer: A. To stabilize the gain
Q 5: What is the common mode rejection ratio (CMRR) of an operational amplifier?
A. The ratio of differential gain to common mode gain
B. The ratio of common mode gain to differential gain
C. The product of differential gain and common mode gain
D. None of the above
B. The ratio of common mode gain to differential gain
C. The product of differential gain and common mode gain
D. None of the above
Answer: A. The ratio of differential gain to common mode gain
Q 6: What is the bandwidth of an operational amplifier?
A. The range of frequencies over which the amplifier operates effectively
B. The maximum frequency it can handle
C. The minimum frequency it can handle
D. None of the above
B. The maximum frequency it can handle
C. The minimum frequency it can handle
D. None of the above
Answer: A. The range of frequencies over which the amplifier operates effectively
Q 7: In which mode does an operational amplifier operate with zero output voltage?
A. Unity gain mode
B. Saturation mode
C. Linear mode
D. Common mode
B. Saturation mode
C. Linear mode
D. Common mode
Answer: D. Common mode
Q 8: What is the output impedance of an ideal operational amplifier?
A. Zero
B. Infinite
C. Very high
D. Very low
B. Infinite
C. Very high
D. Very low
Answer: A. Zero
Q 9: What is the slew rate of an operational amplifier?
A. The rate at which the output voltage changes
B. The maximum output current
C. The input impedance
D. The gain-bandwidth product
B. The maximum output current
C. The input impedance
D. The gain-bandwidth product
Answer: A. The rate at which the output voltage changes
Q 10: In a differential amplifier configuration, what is the function of an operational amplifier?
A. To amplify the difference between two input signals
B. To add two input signals
C. To subtract two input signals
D. To multiply two input signals
B. To add two input signals
C. To subtract two input signals
D. To multiply two input signals
Answer: A. To amplify the difference between two input signals
Q 11: Which component is often used to provide temperature stability in an operational amplifier circuit?
A. Resistor
B. Capacitor
C. Diode
D. Thermistor
B. Capacitor
C. Diode
D. Thermistor
Answer: D. Thermistor
Q 12: What is the purpose of an offset null in an operational amplifier?
A. To eliminate offset voltage
B. To increase gain
C. To decrease bandwidth
D. To improve the slew rate
B. To increase gain
C. To decrease bandwidth
D. To improve the slew rate
Answer: A. To eliminate offset voltage
Q 13: In a voltage follower configuration, what is the voltage gain of an operational amplifier?
A. Zero
B. One
C. Infinite
D. Variable
B. One
C. Infinite
D. Variable
Answer: B. One
Q 14: What type of feedback is used in a stable operational amplifier circuit?
A. Positive feedback
B. Negative feedback
C. Zero feedback
D. Open-loop feedback
B. Negative feedback
C. Zero feedback
D. Open-loop feedback
Answer: B. Negative feedback
Q 15: What is the input bias current in an operational amplifier?
A. The average of the base currents of the input transistors
B. The average of the collector currents of the input transistors
C. The average of the emitter currents of the input transistors
D. The difference between the base currents of the input transistors
B. The average of the collector currents of the input transistors
C. The average of the emitter currents of the input transistors
D. The difference between the base currents of the input transistors
Answer: A. The average of the base currents of the input transistors
Q 16: Which type of operational amplifier configuration is known for having a high input impedance and a low output impedance?
A. Inverting amplifier
B. Non-inverting amplifier
C. Voltage follower
D. Differential amplifier
B. Non-inverting amplifier
C. Voltage follower
D. Differential amplifier
Answer: C. Voltage follower
Q 17: What is the effect of increasing the feedback resistor value in an operational amplifier circuit?
A. Decreases gain
B. Increases gain
C. Has no effect on gain
D. Increases bandwidth
B. Increases gain
C. Has no effect on gain
D. Increases bandwidth
Answer: B. Increases gain
Q 18: What is the common use of an operational amplifier in analogue computation?
A. Differentiation
B. Integration
C. Summation
D. All of the above
B. Integration
C. Summation
D. All of the above
Answer: D. All of the above
Q 19: In a comparator circuit, what does an operational amplifier do?
A. Compares two input voltages and outputs a high or low signal
B. Adds two input voltages
C. Multiplies two input voltages
D. Integrates two input voltages
B. Adds two input voltages
C. Multiplies two input voltages
D. Integrates two input voltages
Answer: A. Compares two input voltages and outputs a high or low signal
Q 20: Which parameter of an operational amplifier describes its ability to reject common-mode signals?
A. Gain-bandwidth product
B. Slew rate
C. Common-mode rejection ratio (CMRR)
D. Input bias current
B. Slew rate
C. Common-mode rejection ratio (CMRR)
D. Input bias current
Answer: C. Common-mode rejection ratio (CMRR)
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