Q. In a non-inverting amplifier configuration, what is the relationship between the input and output voltage?
-
A.
Vout = Vin
-
B.
Vout = Vin + Vref
-
C.
Vout = Vin * (1 + Rf/Rin)
-
D.
Vout = Vin / (1 + Rf/Rin)
Solution
In a non-inverting amplifier, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
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Q. In an inverting amplifier configuration, if the feedback resistor is 10k ohms and the input resistor is 1k ohm, what is the gain?
Solution
The gain of an inverting amplifier is given by -Rf/Rin, which in this case is -10k/1k = -10.
Correct Answer:
A
— -10
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Q. What is the effect of increasing the gain of an operational amplifier?
-
A.
Increased bandwidth
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B.
Decreased bandwidth
-
C.
No effect on bandwidth
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D.
Increased input impedance
Solution
Increasing the gain of an operational amplifier typically decreases its bandwidth due to the gain-bandwidth product.
Correct Answer:
B
— Decreased bandwidth
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Q. What is the effect of negative feedback in an operational amplifier circuit?
-
A.
Increases gain
-
B.
Decreases gain
-
C.
Stabilizes gain
-
D.
Reverses phase
Solution
Negative feedback stabilizes the gain of an operational amplifier and improves linearity.
Correct Answer:
C
— Stabilizes gain
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Q. What is the output voltage of an operational amplifier if the non-inverting input is at 2V and the inverting input is at 1V?
-
A.
0V
-
B.
1V
-
C.
2V
-
D.
Saturation voltage
Solution
If the non-inverting input is higher than the inverting input, the output will go to saturation, typically the supply voltage.
Correct Answer:
D
— Saturation voltage
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Q. What is the primary function of an operational amplifier in a circuit?
-
A.
To amplify voltage signals
-
B.
To convert AC to DC
-
C.
To act as a switch
-
D.
To store electrical energy
Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
A
— To amplify voltage signals
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Q. What is the primary purpose of a summing amplifier?
-
A.
To amplify a single input
-
B.
To sum multiple input voltages
-
C.
To filter signals
-
D.
To convert signals
Solution
A summing amplifier is designed to sum multiple input voltages into a single output voltage.
Correct Answer:
B
— To sum multiple input voltages
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Q. What is the purpose of feedback in an operational amplifier circuit?
-
A.
To increase gain
-
B.
To stabilize the output
-
C.
To reduce power consumption
-
D.
To eliminate noise
Solution
Feedback is used in operational amplifier circuits to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. Which application commonly uses an operational amplifier?
-
A.
Voltage follower
-
B.
Diode rectifier
-
C.
Transistor switch
-
D.
Inductor filter
Solution
A voltage follower is a common application of operational amplifiers, providing high input impedance and low output impedance.
Correct Answer:
A
— Voltage follower
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Q. Which application is NOT typically associated with operational amplifiers?
-
A.
Signal conditioning
-
B.
Voltage regulation
-
C.
Audio amplification
-
D.
Digital logic operations
Solution
Digital logic operations are not typically associated with operational amplifiers, which are used for analog signal processing.
Correct Answer:
D
— Digital logic operations
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Q. Which of the following configurations can be used to create a differential amplifier?
-
A.
Inverting and non-inverting amplifiers
-
B.
Only inverting amplifiers
-
C.
Only non-inverting amplifiers
-
D.
Voltage followers
Solution
A differential amplifier can be created using both inverting and non-inverting amplifier configurations.
Correct Answer:
A
— Inverting and non-inverting amplifiers
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Q. Which of the following configurations can be used to create a summing amplifier?
-
A.
Inverting amplifier
-
B.
Non-inverting amplifier
-
C.
Voltage follower
-
D.
Differential amplifier
Solution
A summing amplifier can be created using an inverting amplifier configuration.
Correct Answer:
A
— Inverting amplifier
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