Q. In a basic inverting op-amp circuit, if Rf is 10kΩ and Rin is 1kΩ, what is the gain?
Solution
The gain of an inverting op-amp is given by -Rf/Rin, which in this case is -10.
Correct Answer:
A
— -10
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Q. In a basic inverting op-amp configuration, what is the relationship between the input and output voltages?
-
A.
Vout = Vin
-
B.
Vout = -Vin
-
C.
Vout = Vin/2
-
D.
Vout = Vin + 1
Solution
In a basic inverting op-amp configuration, the output voltage is the negative of the input voltage (Vout = -Vin).
Correct Answer:
B
— Vout = -Vin
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Q. In a basic summing amplifier configuration, what does the output voltage depend on?
-
A.
The sum of the input voltages
-
B.
The product of the input voltages
-
C.
The difference of the input voltages
-
D.
The average of the input voltages
Solution
In a basic summing amplifier configuration, the output voltage depends on the sum of the input voltages.
Correct Answer:
A
— The sum of the input voltages
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Q. In a differential amplifier configuration, what is the output voltage proportional to?
-
A.
The difference between two input voltages
-
B.
The sum of two input voltages
-
C.
The average of two input voltages
-
D.
The product of two input voltages
Solution
In a differential amplifier configuration, the output voltage is proportional to the difference between two input voltages.
Correct Answer:
A
— The difference between two input voltages
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Q. In a non-inverting op-amp configuration, what is the relationship between the input and output voltages?
-
A.
Vout = Vin
-
B.
Vout = Vin + Vref
-
C.
Vout = Vin * (1 + Rf/Rin)
-
D.
Vout = Vin / (1 + Rf/Rin)
Solution
In a non-inverting op-amp configuration, 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 a non-inverting op-amp 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 configuration, 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 a summing amplifier using an op-amp, what is the output voltage if the inputs are 2V and 3V with equal resistors?
-
A.
5V
-
B.
2.5V
-
C.
1V
-
D.
0V
Solution
In a summing amplifier with equal resistors, the output voltage is the average of the inputs, which is 2.5V.
Correct Answer:
B
— 2.5V
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Q. In small-signal analysis, what is the purpose of the small-signal model?
-
A.
To analyze large signal behavior
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B.
To simplify circuit analysis for small variations
-
C.
To determine thermal characteristics
-
D.
To calculate power dissipation
Solution
The small-signal model is used to simplify circuit analysis for small variations around a bias point.
Correct Answer:
B
— To simplify circuit analysis for small variations
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Q. What is the effect of increasing the feedback resistor (Rf) in a non-inverting op-amp configuration?
-
A.
Increases the output voltage
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B.
Decreases the output voltage
-
C.
Increases the gain
-
D.
Decreases the gain
Solution
Increasing the feedback resistor (Rf) in a non-inverting op-amp configuration increases the gain.
Correct Answer:
C
— Increases the gain
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Q. What is the effect of increasing the value of feedback resistor Rf in a non-inverting op-amp?
-
A.
Increases output voltage
-
B.
Decreases output voltage
-
C.
Increases input impedance
-
D.
Decreases input impedance
Solution
Increasing Rf in a non-inverting op-amp configuration increases the output voltage.
Correct Answer:
A
— Increases output voltage
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Q. What is the output of an inverting op-amp if the input voltage is 1V and the feedback resistor is twice the input resistor?
-
A.
0.5V
-
B.
1V
-
C.
2V
-
D.
-2V
Solution
In an inverting op-amp configuration, if Rf is twice Rin, the output will be -2V for an input of 1V.
Correct Answer:
D
— -2V
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Q. What is the output voltage of a non-inverting op-amp with a gain of 10 and an input voltage of 1V?
-
A.
1V
-
B.
5V
-
C.
10V
-
D.
0.1V
Solution
The output voltage of a non-inverting op-amp with a gain of 10 and an input voltage of 1V is 10V.
Correct Answer:
C
— 10V
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Q. What is the primary role of a diode in a rectifier circuit?
-
A.
To amplify current
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B.
To allow current to flow in one direction
-
C.
To store energy
-
D.
To convert AC to DC
Solution
The primary role of a diode in a rectifier circuit is to allow current to flow in one direction.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the purpose of feedback in op-amp circuits?
-
A.
To increase gain
-
B.
To stabilize the output
-
C.
To reduce power consumption
-
D.
To isolate the input
Solution
Feedback is used in op-amp circuits to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the typical input impedance of an ideal op-amp?
-
A.
Zero ohms
-
B.
Infinite ohms
-
C.
1000 ohms
-
D.
10,000 ohms
Solution
An ideal op-amp has infinite input impedance, which prevents loading the input signal.
Correct Answer:
B
— Infinite ohms
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Q. What is the typical open-loop gain of an ideal op-amp?
-
A.
1
-
B.
10
-
C.
1000
-
D.
Infinity
Solution
An ideal op-amp has an open-loop gain that approaches infinity.
Correct Answer:
D
— Infinity
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Q. Which component is commonly used to set the gain in a non-inverting op-amp configuration?
-
A.
Resistor
-
B.
Capacitor
-
C.
Inductor
-
D.
Diode
Solution
A resistor is commonly used to set the gain in a non-inverting op-amp configuration.
Correct Answer:
A
— Resistor
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Q. Which of the following configurations provides a voltage follower using an op-amp?
-
A.
Inverting configuration
-
B.
Non-inverting configuration
-
C.
Differential configuration
-
D.
Integrator configuration
Solution
A voltage follower is achieved using a non-inverting configuration of an op-amp.
Correct Answer:
B
— Non-inverting configuration
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Q. Which of the following configurations provides the highest input impedance?
-
A.
Inverting configuration
-
B.
Non-inverting configuration
-
C.
Voltage follower
-
D.
Differential amplifier
Solution
The voltage follower configuration provides the highest input impedance.
Correct Answer:
C
— Voltage follower
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Q. Which of the following is a common application of op-amps?
-
A.
Voltage regulation
-
B.
Signal modulation
-
C.
Data storage
-
D.
Power amplification
Solution
Op-amps are commonly used in voltage regulation applications.
Correct Answer:
A
— Voltage regulation
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